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Part Number: MAX1540
Description: The MAX1540/MAX1541 dual pulse-width modulation (PWM) controllers provide the high efficiency, excelle...
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MAX1540
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DataSheet
General Description
MAX1540 General Description
The MAX1540/MAX1541 dual pulse-width modulation (PWM) controllers provide the high efficiency, excellent transient response, and high DC-output accuracy necessary for stepping down high-voltage batteries to generate low-voltage chipset and RAM power supplies in notebook computers.
The Maxim proprietary Quick-PWM™ controllers are free running, constant on-time with input feed forward. This configuration provides ultra-fast transient response, wide input-output (I/O) differential range, low supply current, and tight load-regulation characteristics. The controllers can accurately sense the inductor current across an external current-sense resistor in series with the output to ensure reliable overload and inductor saturation protection. Alternatively, the controllers can use the synchronous rectifier itself or lossless inductor current-sensing methods to provide overload protection with lower power dissipation.
For a single step-down PWM controller with inductorsaturation protection, external-reference input voltage, and dynamically selectable output voltages, refer to the MAX1992/MAX1993 data sheet.
MAX1540 Maximum Ratings
V+, LDOON to GND ............................................-0.3V to +28V
LDOOUT to GND (MAX1540, Note 1) ...................-0.3V to +6V
LDOOUT to GND (MAX1541, Note 1) .................-0.3V to +28V
VDD to GND (MAX1541, Note 1) ..........................-0.3V to +6V
VCC, ON_ to GND.................................................-0.3V to +6V
SKIP, PGOOD_ to GND.........................................-0.3V to +6V
FB_, CSP_, ILIM_ to GND.....................................-0.3V to +6V
TON, OVP/UVP, LSAT to GND ..................-0.3V to (VCC + 0.3V)
REF, OUT_ to GND..................................-0.3V to (VCC + 0.3V)
LDOIN to GND (MAX1541)..................................-0.3V to +28V
REFIN1, GATE, OD, FBLDO to GND (MAX1541).....-0.3V to +6V
FBLANK, CC1 to GND (MAX1541)............-0.3V to (VCC + 0.3V)
DL_ to GND (Note 1) .............................-0.3V to (VDD + 0.3V)
CSN_ to GND .......................................................-2V to +30V
DH_ to LX_.............................................-0.3V to (BST + 0.3V)
LX_ to GND...........................................................-2V to +30V
BST_ to LX_ ........................................................-0.3V to +6V
REF Short Circuit to GND.......................................Continuous
Continuous Power Dissipation (TA = +70°C)
32-Pin 5mm x 5mm Thin QFN (derated 21.3mW/°C
above +70°C)........................................................1702mW
40-Pin 6mm x 6mm Thin QFN (derated 26.3mW/°C
above +70°C)........................................................2105mW
Operating Temperature Range
MAX154_ET_ ..............................................-40°C to +85°C
Junction Temperature................................................+150°C
Storage Temperature Range ......................-65°C to +150°C
Lead Temperature (soldering, 10s) ..........................+300°C
Note 1: For the MAX1540, the gate-driver input supply (VDD) is internally connected to the fixed 5V linear-regulator output (LDOOUT), and the linear-regulator input supply (LDOIN) is internally connected to the battery voltage input (V+).
LDOOUT to GND (MAX1540, Note 1) ...................-0.3V to +6V
LDOOUT to GND (MAX1541, Note 1) .................-0.3V to +28V
VDD to GND (MAX1541, Note 1) ..........................-0.3V to +6V
VCC, ON_ to GND.................................................-0.3V to +6V
SKIP, PGOOD_ to GND.........................................-0.3V to +6V
FB_, CSP_, ILIM_ to GND.....................................-0.3V to +6V
TON, OVP/UVP, LSAT to GND ..................-0.3V to (VCC + 0.3V)
REF, OUT_ to GND..................................-0.3V to (VCC + 0.3V)
LDOIN to GND (MAX1541)..................................-0.3V to +28V
REFIN1, GATE, OD, FBLDO to GND (MAX1541).....-0.3V to +6V
FBLANK, CC1 to GND (MAX1541)............-0.3V to (VCC + 0.3V)
DL_ to GND (Note 1) .............................-0.3V to (VDD + 0.3V)
CSN_ to GND .......................................................-2V to +30V
DH_ to LX_.............................................-0.3V to (BST + 0.3V)
LX_ to GND...........................................................-2V to +30V
BST_ to LX_ ........................................................-0.3V to +6V
REF Short Circuit to GND.......................................Continuous
Continuous Power Dissipation (TA = +70°C)
32-Pin 5mm x 5mm Thin QFN (derated 21.3mW/°C
above +70°C)........................................................1702mW
40-Pin 6mm x 6mm Thin QFN (derated 26.3mW/°C
above +70°C)........................................................2105mW
Operating Temperature Range
MAX154_ET_ ..............................................-40°C to +85°C
Junction Temperature................................................+150°C
Storage Temperature Range ......................-65°C to +150°C
Lead Temperature (soldering, 10s) ..........................+300°C
Note 1: For the MAX1540, the gate-driver input supply (VDD) is internally connected to the fixed 5V linear-regulator output (LDOOUT), and the linear-regulator input supply (LDOIN) is internally connected to the battery voltage input (V+).
MAX1540 Features
Inductor-Saturation Protection
Accurate Differential Current-Sense Inputs
Dual Ultra-High-Efficiency Quick-PWMs with 100ns Load-Step Response
MAX1540
1.8V/1.2V Fixed or 0.7V to 5.5V Adjustable Output (OUT1)
2.5V/1.5V Fixed or 0.7V to 5.5V Adjustable Output (OUT2)
Fixed 5V, 100mA Linear Regulator
MAX1541
External Reference Input (REFIN1)
Dynamically Selectable Output Voltage-0.7V to 5.5V (OUT1)
2.5V/1.8V Fixed or 0.7V to 5.5V Adjustable Output (OUT2)
Optional Power-Good and Fault Blanking During Transitions
Fixed 5V or Adjustable 100mA Linear Regulator
1% VOUT Accuracy over Line and Load
2V to 28V Battery Input Range
170kHz to 620kHz Selectable Switching Frequency
Overvoltage/Undervoltage-Protection Option
1.7ms Digital Soft-Start
Drives Large Synchronous-Rectifier FETs
2V ±0.7% Reference Output
Separate Power-Good Window Comparators
Accurate Differential Current-Sense Inputs
Dual Ultra-High-Efficiency Quick-PWMs with 100ns Load-Step Response
MAX1540
1.8V/1.2V Fixed or 0.7V to 5.5V Adjustable Output (OUT1)
2.5V/1.5V Fixed or 0.7V to 5.5V Adjustable Output (OUT2)
Fixed 5V, 100mA Linear Regulator
MAX1541
External Reference Input (REFIN1)
Dynamically Selectable Output Voltage-0.7V to 5.5V (OUT1)
2.5V/1.8V Fixed or 0.7V to 5.5V Adjustable Output (OUT2)
Optional Power-Good and Fault Blanking During Transitions
Fixed 5V or Adjustable 100mA Linear Regulator
1% VOUT Accuracy over Line and Load
2V to 28V Battery Input Range
170kHz to 620kHz Selectable Switching Frequency
Overvoltage/Undervoltage-Protection Option
1.7ms Digital Soft-Start
Drives Large Synchronous-Rectifier FETs
2V ±0.7% Reference Output
Separate Power-Good Window Comparators
MAX1540 Typical Application
Notebook Computers
Core/IO Supplies as Low as 0.7V
0.7V to 5.5V Supply Rails
CPU/Chipset/GPU with Dynamic Voltage Core Supplies (MAX1541)
DDR Memory Termination (MAX1541)
Active Termination Buses (MAX1541)
Core/IO Supplies as Low as 0.7V
0.7V to 5.5V Supply Rails
CPU/Chipset/GPU with Dynamic Voltage Core Supplies (MAX1541)
DDR Memory Termination (MAX1541)
Active Termination Buses (MAX1541)
MAX1540 Connection Diagram
MAX1540
PDF/DataSheet Download
- Datasheet: MAX1540
- File Size: 865251 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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