19-1357; Rev 1; 7/98
`
`E V A L U A T I O N K I T
`A V A I L A B L E
`
`High-Efficiency, PWM, Step-Down
`DC-DC Controllers in 16-Pin QSOP
`
`MAX1652–MAX1655
`
`____________________________Features
`' 96% Efficiency
`' Small, 16-Pin QSOP Package
`(half the size of a 16-pin narrow SO)
`' Pin-Compatible with MAX797 (MAX1653/MAX1655)
`' Output Voltage Down to 1V (MAX1655)
`' 4.5V to 30V Input Range
`' 99% Duty Cycle for Lower Dropout
`' 170µA Quiescent Supply Current
`' 3µA Logic-Controlled Shutdown
`' Dual, N-Channel, Synchronous-Rectified Control
`' Fixed 150kHz/300kHz PWM Switching,
`or Synchronized from 190kHz to 340kHz
`' Programmable Soft Start
`' Low-Cost Secondary Outputs (MAX1652/MAX1654)
`
`Ordering Information
`
`PART
`MAX1652EEE
`MAX1653ESE
`MAX1653EEE
`MAX1654EEE
`MAX1655ESE
`MAX1655EEE
`
`TEMP. RANGE
`-40°C to +85°C
`-40°C to +85°C
`-40°C to +85°C
`-40°C to +85°C
`-40°C to +85°C
`-40°C to +85°C
`
`PIN-PACKAGE
`16 QSOP
`16 Narrow SO
`16 QSOP
`16 QSOP
`16 Narrow SO
`16 QSOP
`
`Selection Guide
`
`PART
`
`FEEDBACK
`VOLTAGE (V)
`
`SPECIAL
`FEATURE
`
`COMPATIBILITY
`
`MAX1652
`
`MAX1653
`
`MAX1654
`
`2.5
`
`2.5
`
`2.5
`
`MAX1655
`
`1
`
`Regulates positive
`secondary voltage
`(such as +12V)
`
`Same pin order
`as MAX796, but
`smaller package
`
`Logic-controlled,
`low-noise mode
`
`Pin-compatible
`with MAX797
`
`Regulates negative
`secondary voltage
`(such as -5V)
`
`Same pin order
`as MAX799, but
`smaller package
`
`Low output volt-
`ages (1V to 5.5V);
`logic-controlled,
`low-noise mode
`
`Pin compatible
`with MAX797
`(except for feed-
`back voltage)
`
`General Description
`The MAX1652–MAX1655 are high-efficiency, pulse-
`width-modulated (PWM), step-down DC-DC controllers
`in small QSOP packages. The MAX1653/MAX1655 also
`come in 16-pin narrow SO packages that are pin-
`compatible upgrades to the popular MAX797. Improve-
`ments include higher duty-cycle operation for better
`dropout, lower quiescent supply currents for better
`light-load efficiency, and an output voltage down to 1V
`(MAX1655).
`The MAX1652–MAX1655 achieve up to 96% efficiency
`and deliver up to 10A using a unique Idle Mode™ syn-
`chronous-rectified PWM control scheme. These devices
`automatically switch between PWM operation at heavy
`loads and pulse-frequency-modulated (PFM) operation
`at light loads to optimize efficiency over the entire out-
`put current range. The MAX1653/MAX1655 also feature
`logic-controlled, forced PWM operation for noise-sensi-
`tive applications.
`All devices operate with a selectable 150kHz/300kHz
`switching frequency, which can also be synchronized
`to an external clock signal. Both external power switch-
`es are inexpensive N-channel MOSFETs, which provide
`low resistance while saving space and reducing cost.
`The MAX1652 and MAX1654 have an additional feed-
`back pin that permits regulation of a low-cost second
`output tapped from a transformer winding. The
`MAX1652 provides an additional positive output. The
`MAX1654 provides an additional negative output.
`The MAX1652–MAX1655 have a 4.5V to 30V input volt-
`age range. The MAX1652/MAX1653/MAX1654’s output
`range is 2.5V to 5.5V while the MAX1655’s output range
`extends down to 1V. An evaluation kit (MAX1653EVKIT)
`is available to speed designs.
`
`Applications
`
`Notebook Computers
`PDAs
`Cellular Phones
`Hand-Held Computers
`Handy-Terminals
`Mobile Communicators
`Distributed Power
`
`Pin Configurations appear at end of data sheet.
`Idle Mode is a trademark of Maxim Integrated Products.
`
`________________________________________________________________ Maxim Integrated Products 1
`For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
`For small orders, phone 408-737-7600 ext. 3468.
`
`MICROCHIP TECHNOLOGY INC. EXHIBIT 1011
`Page 1 of 28
`
`

`

`High-Efficiency, PWM, Step-Down
`DC-DC Controllers in 16-Pin QSOP
`
`ABSOLUTE MAXIMUM RATINGS
`V+ to GND ..............................................................-0.3V to +36V
`GND to PGND .......................................................-0.3V to +0.3V
`VL to GND ................................................................-0.3V to +6V
`BST to GND ............................................................-0.3V to +36V
`DH to LX .....................................................-0.3V to (BST + 0.3V)
`LX to BST..................................................................-6V to +0.3V
`SHDN to GND...............................................-0.3V to (V+ + 0.3V)
`SYNC, SS, REF, SECFB, SKIP, FB to GND...-0.3V to (VL + 0.3V)
`DL to PGND ..................................................-0.3V to (VL + 0.3V)
`CSH, CSL to GND ....................................................-0.3V to +6V
`VL Short Circuit to GND..............................................Momentary
`
`REF Short Circuit to GND ...........................................Continuous
`VL Output Current ...............................................+50mA to -1mA
`REF Output Current...............................................+5mA to -1mA
`Continuous Power Dissipation (TA = +70°C)
`SO (derate 8.70mW/°C above +70°C) .......................696mW
`QSOP (derate 8.3mW/°C above +70°C) ....................667mW
`Operating Temperature Range
`MAX165_E_E ..................................................-40°C to +85°C
`Storage Temperature Range .............................-65°C to +160°C
`Lead Temperature (soldering, 10sec) .............................+300°C
`
`Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
`operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
`absolute maximum rating conditions for extended periods may affect device reliability.
`
`ELECTRICAL CHARACTERISTICS
`(V+ = +15V, GND = PGND = 0V, SYNC = REF, IVL = IREF = 0A, TA = 0°C to +85°C, unless otherwise noted.)
`PARAMETER
`CONDITIONS
`MIN
`TYP
`3.3V AND 5V STEP-DOWN CONTROLLERS
`Input Supply Range
`
`4.5
`
`MAX1652–MAX1655
`
`5V Output Voltage (CSL)
`
`3.3V Output Voltage (CSL)
`
`0 < (CSH - CSL) < 80mV, FB = VL, 6V < V+ < 30V,
`includes line and load regulation
`
`0 < (CSH - CSL) < 80mV, FB = 0V, 4.5V < V+ < 30V,
`includes line and load regulation
`
`4.85
`
`5.06
`
`5.25
`
`3.20
`
`3.34
`
`3.46
`
`Nominal Adjustable Output
`Voltage Range
`
`External resistor divider
`
`Feedback Voltage
`
`Load Regulation
`
`Line Regulation
`
`Current-Limit Voltage
`
`SS Source Current
`SS Fault Sink Current
`FLYBACK/PWM CONTROLLER
`
`CSH - CSL = 0V, CSL = FB,
`SKIP = 0V, 4.5V < V+ < 30V
`
`0 < (CSH - CSL) < 80mV
`25mV < (CSH - CSL) < 80mV
`6V < V+ < 30V
`CSH - CSL, positive
`CSH - CSL, negative
`VSS = 0V
`VSS = 4V
`
`MAX1655
`MAX1652/MAX1653/
`MAX1654
`MAX1655
`MAX1652/MAX1653/
`MAX1654
`
`1
`
`2.5
`
`0.97
`
`2.43
`
`80
`-50
`2.5
`2.0
`
`1.00
`
`2.50
`
`2
`1.2
`0.03
`100
`-100
`4.0
`
`SECFB Regulation Setpoint
`
`Falling edge, rising edge, hysteresis = 22mV (MAX1652)
`Rising edge, falling edge, hysteresis = 22mV (MAX1654)
`INTERNAL REGULATOR AND REFERENCE
`SHDN = 2V, 0 < IVL < 25mA, 5.5V < V+ < 30V
`VL Output Voltage
`Rising edge, falling edge hysteresis = 50mV
`VL Fault Lockout Voltage
`Rising edge, falling edge hysteresis = 60mV
`VL/CSL Switchover Voltage
`
`2.45
`-0.05
`
`2.50
`0
`
`4.7
`3.8
`4.2
`
`5.0
`3.9
`4.5
`
`5.5
`
`5.5
`
`1.03
`
`2.57
`
`0.06
`120
`-160
`6.5
`
`2.55
`0.05
`
`5.3
`4.0
`4.7
`
`2
`
`_______________________________________________________________________________________
`
`MAX
`
`UNITS
`
`30
`
`V
`
`V
`
`V
`
`V
`
`V
`
`%
`
`%/V
`
`mV
`
`µA
`mA
`
`V
`
`V
`V
`V
`
`MICROCHIP TECHNOLOGY INC. EXHIBIT 1011
`Page 2 of 28
`
`

`

`MAX1652–MAX1655
`
`High-Efficiency, PWM, Step-Down
`DC-DC Controllers in 16-Pin QSOP
`
`ELECTRICAL CHARACTERISTICS (continued)
`(V+ = +15V, GND = PGND = 0V, SYNC = REF, IVL = IREF = 0A, TA = 0°C to +85°C, unless otherwise noted.)
`
`PARAMETER
`Reference Output Voltage
`Reference Fault Lockout Voltage
`Reference Load Regulation
`
`CSL, CSH Shutdown Leakage
`Current
`
`CONDITIONS
`No external load (Note 1)
`Falling edge
`0 < IREF < 100µA
`SHDN = 0V, CSL = 5.5V, CSH = 5.5V, V+ = 0 or 30V,
`VL = 0V
`V+ Shutdown Current
`SHDN = 0V, V+ = 30V, CSL = 0 or 5.5V
`V+ Off-State Leakage Current
`FB = CSH = CSL = 5.5V, VL switched over to CSL
`Dropout Power Consumption
`V+ = 4.5V, CSH = CSL = 4.0V (Note 2)
`Quiescent Power Consumption
`CSH = CSL = 5.5V
`OSCILLATOR AND INPUTS/OUTPUTS
`SYNC = REF
`SYNC = 0 or 5V
`
`Oscillator Frequency
`
`SYNC High Pulse Width
`SYNC Low Pulse Width
`SYNC Rise/Fall Time
`Oscillator Sync Range
`Dropout-Mode Maximum Duty
`Cycle
`
`Input High Voltage
`
`Input Low Voltage
`
`Input Current
`
`DL Sink/Source Current
`DH Sink/Source Current
`DL On-Resistance
`DH On-Resistance
`
`Guaranteed by design, not tested
`
`SYNC = REF
`SYNC = 0 or 5V
`SYNC
`SHDN, SKIP
`SYNC
`SHDN, SKIP
`SHDN, 0 or 30V
`SECFB, 0 or 4V
`SYNC, SKIP
`CSH, CSL, CSH = CSL ≤ 4V
`FB, FB = REF
`DL forced to 2V
`DH forced to 2V, BST - LX = 4.5V
`High or low
`High or low, BST - LX = 4.5V
`
`MIN
`2.46
`2.0
`
`270
`125
`200
`200
`
`190
`97
`98
`VL - 0.5
`2.0
`
`TYP
`2.50
`
`5
`
`0.1
`
`3
`5
`1
`1
`
`300
`150
`
`98
`99
`
`1
`1
`1.5
`1.5
`
`MAX
`2.54
`2.4
`15
`15
`
`UNITS
`V
`V
`mV
`
`1
`
`7
`15
`8
`2
`
`330
`175
`
`200
`340
`
`0.8
`0.5
`3.0
`0.1
`1.0
`70
`±0.1
`
`5
`5
`
`µA
`
`µA
`µA
`mW
`mW
`
`kHz
`
`ns
`ns
`ns
`kHz
`
`%
`
`V
`
`V
`
`µA
`
`A
`A
`Ω
`Ω
`
`Note 1: Since the reference uses VL as its supply, V+ line-regulation error is insignificant.
`Note 2: At very low input voltages, quiescent supply current may increase due to excessive PNP base current in the VL linear
`regulator. This occurs if V+ falls below the preset VL regulation point (5V nominal).
`
`_______________________________________________________________________________________ 3
`
`MICROCHIP TECHNOLOGY INC. EXHIBIT 1011
`Page 3 of 28
`
`

`

`High-Efficiency, PWM, Step-Down
`DC-DC Controllers in 16-Pin QSOP
`
`ELECTRICAL CHARACTERISTICS (continued)
`(V+ = +15V, GND = PGND = 0V, SYNC = REF, IVL = IREF = 0A, TA = -40°C to +85°C, unless otherwise noted.) (Note 3)
`
`CONDITIONS
`
`MIN
`
`TYP
`
`MAX
`
`UNITS
`
`4.5
`
`4.80
`
`3.16
`
`0.96
`
`2.40
`
`70
`-40
`
`2.40
`-0.08
`
`4.7
`3.75
`4.2
`2.43
`
`250
`120
`250
`250
`210
`97
`98
`
`30
`
`5.30
`
`3.50
`
`1.04
`
`2.60
`
`0.06
`130
`-160
`
`2.60
`0.08
`
`5.3
`4.05
`4.7
`2.57
`15
`10
`15
`2
`
`350
`180
`
`320
`
`5
`5
`
`V
`
`V
`
`V
`
`V
`V
`
`%/V
`
`mV
`
`V
`
`V
`V
`V
`V
`mV
`µA
`µA
`mW
`
`kHz
`
`ns
`ns
`kHz
`
`%
`
`Ω
`Ω
`
`PARAMETER
`3.3V and 5V STEP-DOWN CONTROLLERS
`Input Supply Range
`
`5V Output Voltage (CSL)
`
`3.3V Output Voltage (CSL)
`
`Feedback Voltage
`
`Line Regulation
`
`Current-Limit Voltage
`
`FLYBACK/PWM CONTROLLER
`
`0 < (CSH - CSL) < 70mV, FB = VL, 6V < V+ < 30V,
`includes line and load regulation
`
`0 < (CSH - CSL) < 70mV, FB = VL, 4.5V < V+ < 30V,
`includes line and load regulation
`
`CSH - CSL = 0V, 5V < V+ < 30V,
`CSL = FB, SKIP = 0V
`
`MAX1655
`
`MAX1652/MAX1653/
`MAX1654
`
`6V < V+ < 30V
`CSH - CSL, positive
`CSH - CSL, negative
`
`SECFB Regulation Setpoint
`
`Falling edge, hysteresis = 22mV (MAX1652)
`Falling edge, hysteresis = 22mV (MAX1654)
`INTERNAL REGULATOR AND REFERENCE
`VL Output Voltage
`SHDN = 2V, 0 < IVL < 25mA, 5.5V < V+ < 30V
`Rising edge, hysteresis = 50mV
`VL Fault Lockout Voltage
`Rising edge, hysteresis = 60mV
`VL/CSL Switchover Voltage
`No external load (Note 1)
`Reference Output Voltage
`0 < IREF < 100µA
`Reference Load Regulation
`V+ Shutdown Current
`SHDN = 0V, V+ = 30V, CSL = 0 or 5.5V
`FB = CSH = CSL = 5.5V, VL switched over to CSL
`V+ Off-State Leakage Current
`Quiescent Power Consumption
`OSCILLATOR AND INPUTS/OUTPUTS
`SYNC = REF
`SYNC = 0 or 5V
`
`Oscillator Frequency
`
`SYNC High Pulse Width
`SYNC Low Pulse Width
`Oscillator Sync Range
`
`Maximum Duty Cycle
`
`DL On-Resistance
`DH On-Resistance
`
`SYNC = REF
`SYNC = 0 or 5V
`High or low
`High or low, BST - LX = 4.5V
`
`Note 3: Specifications from 0°C to -40°C are guaranteed by design, not production tested.
`
`MAX1652–MAX1655
`
`4
`
`_______________________________________________________________________________________
`
`MICROCHIP TECHNOLOGY INC. EXHIBIT 1011
`Page 4 of 28
`
`

`

`High-Efficiency, PWM, Step-Down
`DC-DC Controllers in 16-Pin QSOP
`
`Typical Operating Circuits
`
`INPUT
`4.5V TO 30V
`
`V+
`
`VL
`
`SHDN
`
`MAX1653
`MAX1655
`
`DH
`
`BST
`
`LX
`
`DL
`
`PGND
`
`CSH
`
`CSL
`
`FB
`
`V+
`
`SECFB
`
`SS
`
`REF
`
`SYNC
`
`GND
`SKIP
`
`SHDN
`
`INPUT
` 6V TO 30V
`
`MAX1652–MAX1655
`
`+3.3V
`OUTPUT
`
`+12V
`OUTPUT
`
`+5V
`OUTPUT
`
`FB
`
`VL
`
`DH
`
`BST
`
`LX
`
`DL
`
`PGND
`
`CSH
`
`CSL
`
`MAX1652
`
`SS
`
`REF
`
`GND
`
`SYNC
`
`_______________________________________________________________________________________ 5
`
`MICROCHIP TECHNOLOGY INC. EXHIBIT 1011
`Page 5 of 28
`
`

`

`High-Efficiency, PWM, Step-Down
`DC-DC Controllers in 16-Pin QSOP
`
`Typical Operating Circuits (continued)
`
`INPUT
`6V TO 30V
`
`FROM
`REF
`
`V+
`
`SHDN
`
`MAX1654
`
`SS
`
`REF
`
`GND
`
`SYNC
`
`SECFB
`FB
`
`VL
`
`DH
`
`BST
`
`LX
`
`DL
`
`PGND
`
`CSH
`
`CSL
`
`-5V
`OUTPUT
`
`+5V
`OUTPUT
`
`MAX1652–MAX1655
`
`__________________________________________Typical Operating Characteristics
`(Circuit of Figure 1, SKIP = GND, TA = +25°C, unless otherwise noted.)
`
`EFFICIENCY vs.
`LOAD CURRENT (3.3V/1A CIRCUIT)
`
`EFFICIENCY vs.
`LOAD CURRENT (3.3V/2A CIRCUIT)
`
`EFFICIENCY vs.
`LOAD CURRENT (3.3V/3A CIRCUIT)
`
`100
`
`90
`
`80
`
`70
`
`60
`
`EFFICIENCY (%)
`
`MAX1652 toc02
`
`V+ = 28V
`
`V+ = 12V
`
`V+ = 6V
`
`100
`
`90
`
`80
`
`70
`
`60
`
`EFFICIENCY (%)
`
`MAX1652 toc01
`
`V+ = 6V
`
`V+ = 28V
`
`V+ = 12V
`
`100
`
`90
`
`80
`
`70
`
`60
`
`EFFICIENCY (%)
`
`MAX1652 toc03
`
`V+ = 6V
`
`V+ = 28V
`
`V+ = 12V
`
`MAX1653
`f = 300kHz
`
`0.01
`
`0.1
`LOAD CURRENT (A)
`
`1
`
`10
`
`50
`0.001
`
`0.01
`
`0.1
`LOAD CURRENT (A)
`
`1
`
`MAX1653
`f = 300kHz
`
`10
`
`50
`0.001
`
`MAX1653
`f = 300kHz
`
`0.01
`
`0.1
`LOAD CURRENT (A)
`
`1
`
`10
`
`50
`0.001
`
`6
`
`_______________________________________________________________________________________
`
`MICROCHIP TECHNOLOGY INC. EXHIBIT 1011
`Page 6 of 28
`
`

`

`High-Efficiency, PWM, Step-Down
`DC-DC Controllers in 16-Pin QSOP
`
`____________________________________Typical Operating Characteristics (continued)
`(Circuit of Figure 1, SKIP = GND, TA = +25°C, unless otherwise noted.)
`
`EFFICIENCY vs.
`LOAD CURRENT (3.3V/5A CIRCUIT)
`
`EFFICIENCY vs.
`LOAD CURRENT (5V/3A CIRCUIT)
`
`EFFICIENCY vs.
`LOAD CURRENT (1.8V/2.5A CIRCUIT)
`
`MAX1652–MAX1655
`
`MAX1652 toc05
`
`10
`
`MAX1652 toc08
`
`MAX1655
`f = 300kHz
`
`V+ = 6V
`
`V+ = 24V
`
`V+ = 12V
`
`100
`
`90
`
`80
`
`70
`
`60
`
`EFFICIENCY (%)
`
`50
`0.001
`
`1
`
`0.01
`
`0.1
`LOAD CURRENT (A)
`SHUTDOWN SUPPLY CURRENT
`vs. INPUT VOLTAGE
`
`SHDN = 0V
`
`10
`
`68
`
`MAX1652 toc04a
`
`10
`
`MAX1652 toc07
`
`IDLE-MODE SUPPLY CURRENT vs.
`INPUT VOLTAGE (3.3V/3A CIRCUIT)
`
`PWM-MODE SUPPLY CURRENT vs.
`INPUT VOLTAGE (3.3V/3A CIRCUIT)
`
`MAX1653
`SKIP = VL
`f = 300kHz
`NO LOAD
`
`30
`
`25
`
`20
`
`15
`
`MAX1652 toc06
`
`MAX1653
`SKIP = 0
`NO LOAD
`
`10
`
`1
`
`100
`
`90
`
`80
`
`70
`
`60
`
`EFFICIENCY (%)
`
`50
`0.001
`
`V+ = 28V
`
`V+ = 12V
`
`100
`
`V+ = 6V
`
`90
`
`80
`
`70
`
`60
`
`EFFICIENCY (%)
`
`10
`
`50
`0.001
`
`MAX1653
`f = 300kHz
`
`0.01
`
`0.1
`LOAD CURRENT (A)
`
`1
`
`V+ = 28V
`
`V+ = 12V
`
`MAX1653
`f = 300kHz
`
`0.01
`
`0.1
`LOAD CURRENT (A)
`
`1
`
`MAX1652 toc04
`
`V+ = 6V
`
`0
`
`5
`
`20
`15
`10
`INPUT VOLTAGE (V)
`
`25
`
`30
`
`4 2
`
`0
`
`SUPPLY CURRENT (mA)
`
`0
`
`5
`
`20
`15
`10
`INPUT VOLTAGE (V)
`
`25
`
`30
`
`VL LOAD-REGULATION ERROR
`vs. VL LOAD CURRENT
`
`MAX1652 MAXIMUM SECONDARY OUTPUT
`CURRENT vs. SUPPLY VOLTAGE
`
`MAX1652 toc12
`
`VSEC > 12.75V,
`+5V OUTPUT > 4.75V,
`CIRCUIT OF FIGURE 9
`
`+5V LOAD = 0A
`
`+5V LOAD = 3A
`
`1500
`
`1200
`
`900
`
`600
`
`300
`
`MAXIMUM SECONDARY CURRENT (mA)
`
`MAX1652 toc011
`
`0
`
`10
`
`20
`
`50
`40
`30
`LOAD CURRENT (mA)
`
`60
`
`70
`
`80
`
`0
`
`0
`
`5
`
`20
`15
`10
`SUPPLY VOLTAGE (V)
`
`25
`
`30
`
`10
`
`5
`
`0
`
`50
`45
`40
`35
`
`30
`25
`20
`15
`10
`5
`0
`
`SUPPLY CURRENT (mA)
`
`LOAD REGULATION DV (mV)
`
`0.1
`
`SUPPLY CURRENT (mA)
`
`0.01
`
`0
`
`5
`
`15
`10
`20
`INPUT VOLTAGE (V)
`
`25
`
`30
`
`REF LOAD-REGULATION ERROR
`vs. REF LOAD CURRENT
`
`MAX1652 toc010
`
`0
`
`50
`
`100
`
`250 300 350
`200
`150
`LOAD CURRENT (µA)
`
`400
`
`30
`
`25
`
`20
`
`15
`
`10
`
`5
`
`0
`
`LOAD REGULATION DV (mV)
`
`_______________________________________________________________________________________ 7
`
`MICROCHIP TECHNOLOGY INC. EXHIBIT 1011
`Page 7 of 28
`
`

`

`High-Efficiency, PWM, Step-Down
`DC-DC Controllers in 16-Pin QSOP
`
`Typical Operating Characteristics (continued)
`(Circuit of Figure 1, SKIP = GND, TA = +25°C, unless otherwise noted.)
`DROPOUT VOLTAGE vs.
`LOAD CURRENT (3.3V/3A CIRCUIT)
`
`MAX1652 toc09
`
`OUTPUT SET FOR 5V (FB = VL)
`VOUT > 4.85V
`
`f = 300kHz
`
`f = 150kHz
`
`500
`
`400
`
`300
`
`200
`
`100
`
`DROPOUT VOLTAGE (mV)
`
`0
`
`0.01
`
`0.1
`1
`LOAD CURRENT (A)
`
`10
`
`
`PULSE-WIDTH-MODULATION
`MODE WAVEFORMS
`
`MAX1652-13
`
`
`IDLE-MODE WAVEFORMS
`
`MAX1652-14
`
`OUTPUT
`VOLTAGE
`
`LX
`VOLTAGE
`
`OUTPUT
`VOLTAGE
`
`LX
`VOLTAGE
`
`TIME (1ms)
`VIN = 6V, 3.3V/3A CIRCUIT
`
`DROPOUT WAVEFORMS
`
`MAX1652-15
`
`10mV/div,
`AC
`
`5V/div
`
`10mV/div,
`AC
`
`5V/div
`
`OUTPUT
`VOLTAGE
`
`LX
`VOLTAGE
`
`OUTPUT
`VOLTAGE
`
`LOAD
`CURRENT
`
`TIME (2.5ms)
`ILOAD = 300mA, VIN = 10V, 3.3V/3A CIRCUIT
`
`LOAD-TRANSIENT RESPONSE
`
`MAX1652-16
`
`50mV/div,
`AC
`
`5V/div
`
`100mV/div,
`AC
`
`2A/div
`
`TIME (5ms)
`VIN = 5.1V, NO LOAD, 3.3V/3A CIRCUIT,
`SET TO 5V OUTPUT (FB = VL)
`
`TIME (10ms)
`VIN = 15V, 3.3V/3A CIRCUIT
`
`8
`
`_______________________________________________________________________________________
`
`MAX1652–MAX1655
`
`MICROCHIP TECHNOLOGY INC. EXHIBIT 1011
`Page 8 of 28
`
`

`

`MAX1652–MAX1655
`
`High-Efficiency, PWM, Step-Down
`DC-DC Controllers in 16-Pin QSOP
`
`Pin Description
`
`PIN
`
`NAME
`
`FUNCTION
`
`1
`
`2
`
`3
`
`4
`
`5
`
`6
`
`7
`
`8
`
`9
`
`10
`
`11
`
`12
`
`13
`
`14
`
`15
`
`16
`
`SS
`
`Soft-Start Timing Capacitor Connection. Ramp time to full current limit is approximately 1ms/nF.
`
`SECFB
`(MAX1652/
`MAX1654)
`
`SKIP
`(MAX1653/
`MAX1655)
`
`Secondary Winding Feedback Input. Normally connected to a resistor divider from an auxiliary output.
`Don’t leave SECFB unconnected.
`• MAX1652: SECFB regulates at VSECFB = 2.50V. Tie to VL if not used.
`• MAX1654: SECFB regulates at VSECFB = 0V. Tie to a negative voltage through a high-value current-
`limiting resistor (IMAX = 100µA) if not used.
`Disables pulse-skipping mode when high. Connect to GND for normal use. Don’t leave SKIP unconnected.
`With SKIP grounded, the device will automaticallychange from pulse-skipping operation to full PWM opera-
`tion when the load current exceeds approximately 30% of maximum (Table 3).
`
`REF
`
`GND
`
`SYNC
`
`SHDN
`
`FB
`
`CSH
`
`CSL
`
`V+
`
`VL
`
`Reference Voltage Output. Bypass to GND with 0.33µF minimum.
`
`Low-Noise Analog Ground and Feedback Reference Point
`
`Oscillator Synchronization and Frequency Select. Tie to GND or VL for 150kHz operation; tie to REF for
`300kHz operation. A high-to-low transition begins a new cycle. Drive SYNC with 0 to 5V logic levels (see the
`Electrical Characteristicstable for VIH and VIL specifications). SYNC capture range is 190kHz to 340kHz.
`Shutdown Control Input, active low. Logic threshold is set at approximately 1V (VTH of an internal N-channel
`MOSFET). Tie SHDN to V+ for automatic start-up.
`
`Feedback Input. Regulates at the feedback voltage in adjustable mode. FB is a Dual ModeTM input that also
`selects the fixed output voltage settings as follows:
`• Connect to GND for 3.3V operation.
`• Connect to VL for 5V operation.
`• Connect FB to a resistor divider for adjustable mode. FB can be driven with +5V CMOS logic in order to
`change the output voltage under system control.
`
`Current-Sense Input, high side. Current-limit level is 100mV referred to CSL.
`
`Current-Sense Input, low side. Also serves as the feedback input in fixed-output modes.
`
`Battery Voltage Input (4.5V to 30V). Bypass V+ to PGND close to the IC with a 0.1µF capacitor. Connects to a
`linear regulator that powers VL.
`
`5V Internal Linear-Regulator Output. VL is also the supply voltage rail for the chip. VL is switched to the out-
`put voltage via CSL (VCSL > 4.5V) for automatic bootstrapping. Bypass to GND with 4.7µF. VL can supply up
`to 5mA for external loads.
`
`PGND
`
`Power Ground
`
`DL
`
`BST
`
`LX
`
`DH
`
`Low-Side Gate-Drive Output. Normally drives the synchronous-rectifier MOSFET. Swings from 0V to VL.
`
`Boost Capacitor Connection for High-Side Gate Drive (0.1µF)
`
`Switching Node (inductor) Connection. Can swing 2V below ground without hazard.
`
`High-Side Gate-Drive Output. Normally drives the main buck switch. DH is a floating driver output that swings
`from LX to BST, riding on the LX switching-node voltage.
`
`Dual Mode is a trademark of Maxim Integrated Products.
`
`_______________________________________________________________________________________ 9
`
`MICROCHIP TECHNOLOGY INC. EXHIBIT 1011
`Page 9 of 28
`
`

`

`High-Efficiency, PWM, Step-Down
`DC-DC Controllers in 16-Pin QSOP
`
`Detailed Description
`The MAX1652 family are BiCMOS, switch-mode power-
`supply controllers designed primarily for buck-topology
`regulators in battery-powered applications where high
`efficiency and low quiescent supply current are critical.
`The parts also work well in other topologies such as
`boost, inverting, and Cuk due to the flexibility of their
`floating high-speed gate driver. Light-load efficiency is
`enhanced by automatic idle-mode operation—a vari-
`able-frequency pulse-skipping mode that reduces
`losses due to MOSFET gate charge. The step-down
`power-switching circuit consists of two N-channel
`MOSFETs, a rectifier, and an LC output filter. The out-
`put voltage is the average of the AC voltage at the
`switching node, which is adjusted and regulated by
`changing the duty cycle of the MOSFET switches. The
`gate-drive signal to the N-channel high-side MOSFET
`must exceed the battery voltage and is provided by a
`flying capacitor boost circuit that uses a 100nF capaci-
`tor connected to BST.
`
`Standard Application Circuits
`It’s easy to adapt the basic MAX1653 single-output 3.3V
`buck converter (Figure 1) to meet a wide range of appli-
`cations with inputs up to 30V (limited by choice of exter-
`nal MOSFET). Simply substitute the appropriate
`components from Table 1 (candidate suppliers are pro-
`vided in Table 2). These circuits represent a good set of
`trade-offs among cost, size, and efficiency while staying
`within the worst-case specification limits for stress-relat-
`ed parameters such as capacitor ripple current.
`Don’t change the frequency of these circuits without
`first recalculating component values (particularly induc-
`tance value at maximum battery voltage).
`For a discussion of dual-output circuits using the
`MAX1652 and MAX1654, see Figure 9 and the
`Secondary Feedback-Regulation Loopsection.
`
`MAX1652–MAX1655
`
`C4
`4.7mF
`
`D2
`CMPSH-3
`
`C3
`0.1mF
`
`Q1
`
`Q2
`
`D1
`
`L1
`
`R1
`
`C5
`0.33mF
`
`+5V AT
`5mA
`
`+3.3V
`OUTPUT
`
`C2
`
`GND
`OUT
`
`REF OUTPUT
`+2.5V AT 100mA
`
`16
`
`14
`
`15
`
`13
`
`12
`
`8 9
`
`4
`3
`
`DH
`
`BST
`
`LX
`
`DL
`
`PGND
`
`CSH
`
`CSL
`
`GND
`REF
`
`INPUT
`
`C1
`
`ON/OFF
`CONTROL
`
`LOW-NOISE
`CONTROL
`
`C6
`0.01mF
`(OPTIONAL)
`
`6
`
`2
`
`1
`
`C7
`0.1mF
`
`SHDN
`
`10
`
`V+
`
`11
`VL
`
`SKIP
`
`MAX1653
`
`SS
`
`FB
`7
`
`SYNC
`5
`
`NOTE: KEEP CURRENT-SENSE
` LINES SHORT AND CLOSE
` TOGETHER. SEE FIGURE 8.
`
`J1
`150kHz/300kHz
`JUMPER
`
`Figure 1. Standard 3.3V Application Circuit (see Table 1 for Component Values)
`
`10
`
`______________________________________________________________________________________
`
`MICROCHIP TECHNOLOGY INC. EXHIBIT 1011
`Page 10 of 28
`
`

`

`High-Efficiency, PWM, Step-Down
`DC-DC Controllers in 16-Pin QSOP
`
`MAX1652–MAX1655
`
`Table 1. Component Selection for Standard Applications
`COMPONENT
`3.3V at 1A
`3.3V at 2A
`5V/3.3V at 3A
`Input Range
`4.75V to 28V
`4.75V to 28V
`4.75V to 28V
`Frequency
`300kHz
`300kHz
`300kHz
`
`Q1 High-Side
`MOSFET
`
`International Rectifier
`1/2 IRF7101
`
`Q2 Low-Side
`MOSFET
`
`International Rectifier
`1/2 IRF7101
`
`International Rectifier
`1/2 IRF7303 or
`Fairchild
`Semiconductor
`1/2 NDS8936
`
`International Rectifier
`1/2 IRF7303 or
`Fairchild
`Semiconductor
`1/2 NDS8936
`
`International Rectifier
`IRF7403 or
`Fairchild
`Semiconductor
`NDS 8410A
`
`International Rectifier
`IRF7403 or
`Fairchild
`Semiconductor
`NDS 8410A
`
`3.3V at 5A
`4.75V to 28V
`300kHz
`
`Fairchild
`Semiconductor
`FDS6680
`
`Fairchild
`Semiconductor
`FDS6680
`
`1.8V at 2.5A
`4.75V to 22V
`150kHz
`
`International Rectifier
`1/2 IRF7303 or
`Fairchild
`Semiconductor
`1/2 NDS8936
`
`International Rectifier
`1/2 IRF7303 or
`Fairchild
`Semiconductor
`1/2 NDS8936
`
`C1 Input
`Capacitor
`
`10µF, 35V
`AVX
`TPSD106M035R0300
`
`22µF, 35V
`AVX
`TPSE226M035R0300
`
`(2) 22µF, 35V
`AVX
`TPSE226M035R0300
`
`(3) 22µF, 35V
`AVX
`TPSE226M035R0300
`
`10µF, 25V ceramic
`Taiyo Yuden
`TMK325F106Z
`
`C2 Output
`Capacitor
`
`100µF, 6.3V
`AVX TPSC107M006R
`
`220µF, 10V
`AVX
`TPSE227M010R0100
`or Sprague
`594D227X001002T
`
`470µF, 6V (for 3.3V)
`Kemet
`T510X477M006AS
`or
`(2) 220µF, 10V (for 5V)
`AVX
`TPSE227M010R011
`
`D1 Rectifier
`
`R1 Sense
`Resistor
`
`1N5819 or Motorola
`MBR0520L
`70mΩ
`Dale WSL-1206-R070F
`or IRC LR2010-01-R070
`
`1N5819 or Motorola
`MBRS130LT3
`33mΩ
`Dale WSL-2010-R033F
`or IRC LR2010-01-R033
`
`1N5819 or Motorola
`MBRS130LT3
`25mΩ
`Dale WSL-2010-R025F
`or IRC LR2010-01-R025
`
`(3) 330µF, 10V
`Sprague
`594D337X0010R2T
`or
`(2) 470µF, 6V
`Kemet
`T510X477M006AS
`
`1N5821 or Motorola
`MBRS340T3
`
`12mΩ
`Dale WSL-2512-R012F
`
`470µF, 4V
`Sprague
`594D477X0004R2T
`or
`470µF, 6V
`Kemet
`T510X477M006AS
`
`1N5817 or Motorola
`MBRS130LT3
`30mΩ
`Dale WSL-2010-R030F
`or IRC LR2010-01-R030
`
`L1 Inductor
`
`33µH
`Sumida CDR74B-330
`
`15µH
`Sumida CDR105B-150
`
`10µH
`Sumida CDRH125-100
`
`4.7µH
`Sumida CDRH127-4R7
`
`15µH
`Sumida CDRH125-150
`
`Table 2. Component Suppliers
`
`MANUFACTURER
`
`USA PHONE
`
`AVX
`Central Semiconductor
`Coilcraft
`Coiltronics
`Dale
`Fairchild
`International Rectifier
`IRC
`Kemet
`Matsuo
`Motorola
`
`803-946-0690
`516-435-1110
`847-639-6400
`561-241-7876
`605-668-4131
`408-822-2181
`310-322-3331
`512-992-7900
`408-986-0424
`714-969-2491
`602-303-5454
`
`FACTORY FAX
`[Country Code]
`[1] 803-626-3123
`[1] 516-435-1824
`[1] 847-639-1469
`[1] 561-241-9339
`[1] 605-665-1627
`[1] 408-721-1635
`[1] 310-322-3332
`[1] 512-992-3377
`[1] 408-986-1442
`[1] 714-960-6492
`[1] 602-994-6430
`
`MANUFACTURER
`
`USA PHONE
`
`Murata
`
`NIEC
`Sanyo
`
`Siliconix
`
`Sprague
`Sumida
`Taiyo Yuden
`TDK
`Transpower Technologies
`
`* Distributor
`
`814-237-1431
`800-831-9172
`805-867-2555*
`619-661-6835
`408-988-8000
`800-554-5565
`603-224-1961
`847-956-0666
`408-573-4150
`847-390-4461
`702-831-0140
`
`FACTORY FAX
`[Country Code]
`
`[1] 814-238-0490
`
`[81] 3-3494-7414
`[81] 7-2070-1174
`
`[1] 408-970-3950
`
`[1] 603-224-1430
`[81] 3-3607-5144
`[1] 408-573-4159
`[1] 847-390-4405
`[1] 702-831-3521
`
`______________________________________________________________________________________ 11
`
`MICROCHIP TECHNOLOGY INC. EXHIBIT 1011
`Page 11 of 28
`
`

`

`High-Efficiency, PWM, Step-Down
`DC-DC Controllers in 16-Pin QSOP
`
`The MAX1652–MAX1655 contain nine major circuit
`blocks, which are shown in Figure 2:
`PWM Controller Blocks:
`• Multi-Input PWM Comparator
`• Current-Sense Circuit
`• PWM Logic Block
`• Dual-Mode Internal Feedback Mux
`• Gate-Driver Outputs
`• Secondary Feedback Comparator
`Bias Generator Blocks:
`• +5V Linear Regulator
`• Automatic Bootstrap Switchover Circuit
`• +2.50V Reference
`These internal IC blocks aren’t powered directly from
`the battery. Instead, a +5V linear regulator steps down
`the battery voltage to supply both the IC internal rail (VL
`pin) as well as the gate drivers. The synchronous-
`switch gate driver is directly powered from +5V VL,
`while the high-side-switch gate driver is indirectly pow-
`ered from VL via an external diode-capacitor boost cir-
`cuit. An automatic bootstrap circuit turns off the +5V
`linear regulator and powers the IC from its output volt-
`age if the output is above 4.5V.
`PWM Controller Block
`The heart of the current-mode PWM controller is a
`multi-input open-loop comparator that sums three sig-
`nals: output voltage error signal with respect to the ref-
`erence voltage, current-sense signal, and slope
`compensation ramp (Figure 3). The PWM controller is a
`direct summing type, lacking a traditional error amplifi-
`er and the phase shift associated with it. This direct-
`summing configuration approaches the ideal of
`cycle-by-cycle control over the output voltage.
`Under heavy loads, the controller operates in full PWM
`mode. Each pulse from the oscillator sets the main
`PWM latch that turns on the high-side switch for a peri-
`od determined by the duty factor (approximately
`VOUT/VIN). As the high-side switch turns off, the syn-
`chronous rectifier latch is set. 60ns later the low-side
`switch turns on, and stays on until the beginning of the
`next clock cycle (in continuous mode) or until the
`inductor current crosses zero (in discontinuous mode).
`Under fault conditions where the inductor current
`exceeds the 100mV current-limit threshold, the high-
`side latch resets and the high-side switch turns off.
`If the load is light in Idle Mode (SKIP = low), the induc-
`tor current does not exceed the 25mV threshold set by
`the Idle Mode comparator. When this occurs, the con-
`troller skips most of the oscillator pulses in order to
`reduce the switching frequency and cut back gate-
`
`charge losses. The oscillator is effectively gated off at
`light loads because the Idle Mode comparator immedi-
`ately resets the high-side latch at the beginning of each
`cycle, unless the feedback signal falls below the refer-
`ence voltage level.
`When in PWM mode, the controller operates as a fixed-
`frequency current-mode controller where the duty ratio
`is set by the input/output voltage ratio. The current-
`mode feedback system regulates the peak inductor
`current as a function of the output voltage error signal.
`Since the average inductor current is nearly the same
`as the peak current, the circuit acts as a switch-mode
`transconductance amplifier and pushes the second out-
`put LC filter pole, normally found in a duty-factor-
`controlled (voltage-mode) PWM, to a higher frequency.
`To preserve inner-loop stability and eliminate regenera-
`tive inductor current “staircasing,” a slope-compensa-
`tion ramp is summed into the main PWM comparator to
`reduce the apparent duty factor to less than 50%.
`The relative gains of the voltage- and current-sense
`inputs are weighted by the values of current sources
`that bias three differential input stages in the main PWM
`comparator (Figure 4). The relative gain of the voltage
`comparator to the current comparator is internally fixed
`at K = 2:1. The resulting loop gain (which is relatively
`low) determines the 2% typical load regulation error.
`The low loop-gain value helps reduce output filter
`capacitor size and cost by shifting the unity-gain
`crossover to a lower frequency.
`The output filter capacitor C2 sets a dominant pole in
`the feedback loop. This pole must roll off the loop gain
`to unity before the zero introduced by the output
`capacitor’s parasitic resistance (ESR) is encountered
`(see Design Procedure section). A 12kHz pole-zero
`cancellation filter provides additional rolloff above the
`unity-gain crossover. This internal 12kHz lowpass com-
`pensation filter cancels the zero due to the filter capaci-
`tor’s ESR. The 12kHz filter is included in the loop in
`both fixed- and adjustable-output modes.
`Synchronous-Rectifier Driver (DL Pin)
`Synchronous rectification reduces conduction losses in
`the rectifier by shunting the normal Schottky diode with
`a low-resistance MOSFET switch. The synchronous rec-
`tifier also ensures proper start-up of the boost-gate driv-
`er circuit. If you must omit the synchronous power
`MOSFET for cost or other reasons, replace it with a
`small-signal MOSFET such as a 2N7002.
`If the circuit is operating in continuous-conduction mode,
`the DL drive waveform is simply the complement of the
`DH high-side drive waveform (with controlled dead
`time to prevent cross-conduction or “shoot-through”).
`
`12
`
`______________________________________________________________________________________
`
`MAX1652–MAX1655
`
`MICROCHIP TECHNOLOGY INC. EXHIBIT 1011
`Page 12 of 28
`
`

`

`High-Efficiency, PWM, Step-Down
`DC-DC Controllers in 16-Pin QSOP
`
`MAX1652–MAX1655
`
`AUXILIARY
`OUTPUT
`
`MAIN
`OUTPUT
`
`BATTERY VOLTAGE
`
`TO
`CSL
`
`V+
`
`+5V LINEAR
`REGULATOR
`SHDN
`
`OUT
`
`VL
`
`+5V AT 5mA
`
`+2.50V
`REF
`
`PWM
`LOGIC
`
`PWM
`COMPARATOR
`
`LPF
`12kHz
`
`BST
`
`DH
`
`LX
`
`DL
`
`PGND
`
`CSH
`
`CSL
`
`3.3V FB
`
`5V FB
`
`ADJ FB
`
`FB
`
`4.5V
`
`SECFB
`
`+2.50V
`AT 100mA
`
`ON/OFF
`
`REF
`
`GND
`
`SHDN
`
`SS
`
`MAX1652
`MAX1653
`MAX1654
`MAX1655
`
`4V
`
`SYNC
`
`1V
`
`Figure 2. MAX1652–MAX1655 Functional Diagram
`
`______________________________________________________________________________________ 13
`
`MICROCHIP TECHNOLOGY INC. EXHIBIT 1011
`Page 13 of 28
`
`

`

`High-Efficiency, PWM, Step-Down
`DC-DC Controllers in 16-Pin QSOP
`
`CSH
`
`CSL
`
`FROM
`FEEDBACK
`DIVIDER
`
`R
`
`S
`
`Q
`
`OSC
`
`LEVEL
`SHIFT
`
`BST
`
`DH
`
`LX
`
`SHOOT-
`THROUGH
`CONTROL
`
`LEVEL
`SHIFT
`
`VL
`
`DL
`
`PGND
`
`2.5V (1V, MAX1655)
`
`MAIN PWM
`COMPARATOR
`
`SLOPE COMP
`
`IDLE MODE
`COMPARATOR
`
`25mV
`
`SKIP
`(MAX1653/
`MAX1655
`ONLY)
`
`VL
`
`4mA
`
`CURRENT
`LIMIT
`
`SS
`
`SHDN
`
`-100mV
`
`SECFB
`
`24R
`
`2.5V
`
`1R
`
`N
`
`SYNCHRONOUS-
`RECTIFIER CONTROL
`
`Q
`
`R
`
`S
`
`REF (MAX1652)
`GND (MAX1654)
`
`COMPARATOR
`
`1ms
`SINGLE-SHOT
`
`(NOTE 1)
`
`MAX1652, MAX1654 ONLY
`
`NOTE 1: COMPARATOR INPUT POLARITIES
` ARE REVERSED FOR THE MAX1654.
`
`MAX1652–MAX1655
`
`Figure 3. PWM Controller Detailed Block Diagram
`
`14
`
`______________________________________________________________________________________
`
`MICROCHIP TECHNOLOGY INC. EXHIBIT 1011
`Page 14 of 28
`
`

`

`MAX1652–MAX1655
`
`High-Efficiency, PWM, Step-Down
`DC-DC Controllers in 16-Pin QSOP
`
`VL
`
`R1
`
`R2
`
`FB
`
`REF
`CSH
`CSL
`
`I1
`
`I2
`
`I3
`
`TO PWM
` LOGIC
`
`UNCOMPENSATED
`HIGH-SPEED
`LEVEL TRANSLATOR
`AND BUFFER
`
`OUTPUT DRIVER
`
`SLOPE COMPENSATION
`
`Figure 4. Main PWM Comparator Block Diagram
`
`In discontinuous (light-load) mode, the synchronous
`switch is turned off as the inductor current falls through
`zero. The synchronous rectifier works under all operat-
`ing conditions, including idle mode. The synchronous-
`switch timing is further controlled by the secondary
`feedback (SECFB) signal in order to improve multiple-
`output cross-regulation (see Secondary Feedba