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MAX1534

Maxim Integrated Products
Part Number MAX1534
Manufacturer Maxim Integrated Products
Description High-Efficiency / Triple-Output / Keep-Alive Power-Supply
Published Sep 27, 2005
Detailed Description 19-2662; Rev 0; 10/02 High-Efficiency, Triple-Output, Keep-Alive Power Supply for Notebook Computers General Descriptio...
Datasheet PDF File MAX1534 PDF File

MAX1534
MAX1534

Overview
19-2662; Rev 0; 10/02 High-Efficiency, Triple-Output, Keep-Alive Power Supply for Notebook Computers General Description The MAX1534 is a high-efficiency, triple-output power supply for keep-alive (always on) voltage rails.
The 500mA buck regulator with an internal current-limited 0.
5Ω PMOS steps down the battery or wall adapter supply rail to a fixed 5V or an adjustable output voltage.
Two integrated low-voltage linear regulators follow this output and provide two independent preset output voltages of 3.
3V and 1.
8V, or adjustable output voltages.
The buck regulator utilizes a peak current-limit, pulsefrequency modulation (PFM) architecture for highest light-load efficiency to conserve battery life.
High switching frequencies (up to 200kHz) allow the use of tiny surface-mount inductors and output capacitors.
Operation to 100% duty cycle minimizes dropout voltage (250mV at 500mA).
The low-dropout linear regulators use an internal P-channel metal-oxide (PMOS) pass transistor to minimize supply current and deliver up to 160mA each of continuous current.
The MAX1534 includes a power-OK (POK) signal that indicates all outputs are in regulation.
The 4% accurate threshold of the SHDN input permits its use as a lowbattery detector.
The MAX1534 is available in a small 16-pin thin QFN (4mm ✕ 4mm) package, occupying 33% less board space than discrete solutions.
Features o One Switching and Two Linear Regulators o Switching Regulator +4.
5V to +24V Input Voltage Range Over 95% Efficiency Up to 500mA Output Current Up to 200kHz Switching Frequency Fixed 5V or Adjustable Output Voltage Internal 0.
5Ω PMOS Switch 100% Maximum Duty Cycle for Low-Dropout Operation o Two Low-Dropout Linear Regulators Up to 160mA Output Current (Each) 3.
3V/Adj Output Voltage for OUT1 1.
8V/Adj Output Voltage for OUT2 o ±1.
5% Accurate Output Voltage o ±4% Accurate Shutdown for Low Battery Detection o Thermal Shutdown Protection o POK Output o 1mW Typical Standby Power MAX1534 Applications Notebook and...


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