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MAX1901

Maxim
Part Number MAX1901
Manufacturer Maxim
Description 500kHz Multi-Output / Low-Noise Power-Supply Controllers for Notebook Computers
Published May 6, 2005
Detailed Description 19-2224; Rev 3; 12/03 500kHz Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers General Descriptio...
Datasheet PDF File MAX1901 PDF File

MAX1901
MAX1901

Overview
19-2224; Rev 3; 12/03 500kHz Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers General Description The MAX1901/MAX1902/MAX1904 are buck-topology, step-down, switch-mode, power-supply controllers that generate logic-supply voltages in battery-powered systems.
These high-performance, dual/triple-output devices include on-board power-up sequencing, power-good signaling with delay, digital soft-start, secondary winding control, low dropout circuitry, internal frequency-compensation networks, and automatic bootstrapping.
Up to 97% efficiency is achieved through synchronous rectification and Maxim’s proprietary Idle Mode™ control scheme.
Efficiency is greater than 80% over a 1000:1 load-current range, which extends battery life in system suspend or standby mode.
Excellent dynamic response corrects output load transients within five clock cycles.
Strong 1A on-board gate drivers ensure fast external Nchannel MOSFET switching.
These devices feature a logic-controlled and synchronizable, fixed-frequency, pulse-width modulation (PWM) operating mode.
This reduces noise and RF interference in sensitive mobile communications and pen-entry applications.
Asserting the SKIP pin enables fixed-frequency mode, for lowest noise under all load conditions.
The MAX1901/MAX1902/MAX1904 include two PWM regulators, adjustable from 2.
5V to 5.
5V with fixed 5.
0V and 3.
3V modes.
All these devices include secondary feedback regulation, and the MAX1902 contains a 12V/120mA linear regulator.
The MAX1901/MAX1904 include a secondary feedback input (SECFB), plus a control pin (STEER) that selects which PWM (3.
3V or 5V) receives the secondary feedback signal.
SECFB provides a method for adjusting the secondary winding voltage regulation point with an external resistor divider, and is intended to aid in creating auxiliary voltages other than fixed 12V.
The MAX1901/MAX1902 contain internal output overvoltage and undervoltage protection features.
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