MAX1534

PRODUCTION

High-Efficiency, Triple-Output, Keep-Alive Power Supply for Notebook Computers

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $5.60

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Overview

One Switching and Two Linear Regulators
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
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
±1.5% Accurate Output Voltage
±4% Accurate Shutdown for Low Battery Detection
Thermal Shutdown Protection
POK Output
1mW Typical Standby Power

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, pulse-frequency 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 active-low SHDN input permits its use as a low-battery detector.

The MAX1534 is available in a small 16-pin thin QFN (4mm x 4mm) package, occupying 33% less board space than discrete solutions.

Applications

2 to 4 Li+ Cell Battery-Powered Devices
Handheld Devices
Keep-Alive Supplies
Notebook and Subnotebook Computers
Standby Supplies
Wake On LAN®

Part Models: 2
1ku List Price: Starting From $5.60

Documentation

Data Sheet 1

MAX1534-MAX1534ETE: High-Efficiency, Triple-Output, Keep-Alive Power Supply for Notebook Computers Data Sheet (Rev.0) 12/20/2002

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX1534ETE+	16-LFCSP-4X4X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1534ETE+T	16-LFCSP-4X4X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 20, 2016 - 1612 ASSEMBLY
		pcn_1612
MAX1534ETE+	PRODUCTION
MAX1534ETE+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Switching Regulators & Controllers 1
MAX1776	PRODUCTION	24V, 600mA Internal Switch, 100% Duty Cycle, Step-Down Converter

Evaluation Kits

Evaluation Kit for the MAX1534

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Features and Benefits

Triple-Output Power Supply
- 5.0V at 500mA (typ)
- 3.3V at 160mA
- 1.8V at 160mA
Integrated Power MOSFETs
4.5V to 24V Input Supply Range
Adjustable Inductor Current Limit
Fixed or Adjustable Outputs
Power-OK (POK) Output
3.5µA Shutdown Supply Current (typ)
Surface-Mount Construction
Fully Assembled and Tested

Product Details

The MAX1534 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that demonstrates the MAX1534 triple-output keep-alive power supply IC. The MAX1534 integrates one high-performance step-down converter and two low-dropout regulators (LDOs). The step-down converter is configured for 5.0V and provides up to 500mA. The first and second LDOs are configured for 3.3V and 1.8V at currents up to 160mA each. Power management functions include an accurate shutdown input and power-OK (POK) output. The EV kit also allows for adjustable output voltages by including extra pads for feedback resistors.