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MAX1540A

Maxim Integrated Products
Part Number MAX1540A
Manufacturer Maxim Integrated Products
Description Dual Step-Down Controllers
Published Mar 25, 2010
Detailed Description 19-2861; Rev 3; 2/07 KIT ATION EVALU E L B AVAILA www.DataSheet4U.com Dual Step-Down Controllers with Saturation Prot...
Datasheet PDF File MAX1540A PDF File

MAX1540A
MAX1540A

Overview
19-2861; Rev 3; 2/07 KIT ATION EVALU E L B AVAILA www.
DataSheet4U.
com Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator General Description The MAX1540A/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.
Features ♦ Inductor-Saturation Protection ♦ Accurate Differential Current-Sense Inputs ♦ Dual Ultra-High-Efficiency Quick-PWMs with 100ns Load-Step Response ♦ MAX1540A 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 ♦...


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