MAX1572

800mA, 2MHz, PWM DC-to-DC Step-Down Converter with Reset

800mA, Sub-1V, 2MHz, PWM, Step-Down DC-DC Uses Tiny 2.2µH Inductor, Includes Reset Output

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Overview

Up to 97% Efficiency
2MHz PWM Switching
800mA Guaranteed Output Current
Low 48µA Quiescent Current
Power-Saving Modes: Pulse-Group, Pulse-Skip, Forced-PWM Mode
0.75V to 2.5V Preset Output Range (in 50mV Increments)
Voltage-Positioning Load Transients
5mV_P-P Output Ripple
Tiny 2.2µH Inductor
10µF Ceramic Output Capacitor
Low 0.1µA Shutdown Current
No External Schottky Diode Required
Soft-Start with Zero Inrush Current
170ms (min) active-low RESET Output
Small 12-Pin, 4mm x 4mm Thin QFN Package

The MAX1572 is a fixed-frequency, synchronous step-down DC-to-DC converter to power low-voltage microprocessor/DSP cores in portable equipment requiring high efficiency in a limited PC board area. The features are optimized for high efficiency over a wide load range, small external component size, low output ripple, and excellent transient response. The input supply voltage range is from 2.6V to 5.5V, while the output is internally fixed from 0.75V to 2.5V in 50mV increments with a guaranteed output current of 800mA. The high 2MHz switching allows tiny low-cost capacitors and a low-profile inductor, while the power-saving pulse-group mode reduces quiescent current to 48µA (typ) with light loads. To reduce noise and RF interference, the converter can be configured to provide forced-PWM operation.

The MAX1572 includes a low on-resistance internal MOSFET switch and synchronous rectifier to maximize efficiency and minimize external component count. No external diode is needed. Other features include soft-start to eliminate inrush current at startup and a 170ms (min) RESET-bar output to provide power-on/undervoltage reset. The MAX1572 is available in a 12-pin, 4mm x 4mm thin QFN package with exposed paddle.

Applications

Cell Phones/Smartphones
Digital Cameras and Camcorders
Handheld Instruments (PDAs, Palmtops)
MP3 and DVD Players
PCMCIA Cards
PDAs, Palmtops, and Notebook Computers

Documentation

Data Sheet 1

MAX1572: 800mA, 2MHz, PWM DC-to-DC Step-Down Converter with Reset Data Sheet (Rev.1) 12/06/2004

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 11
MAX1920	PRODUCTION	Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23
MAX1921	PRODUCTION	Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23
MAX1927	PRODUCTION	Low-Output-Voltage, 800mA, PWM Step-Down DC-DC Converters
MAX1928	PRODUCTION	Low-Output-Voltage, 800mA, PWM Step-Down DC-DC Converters

MAX1958		W-CDMA/N-CDMA Cellular Phone HBT PA Management ICs
MAX1959		W-CDMA/N-CDMA Cellular Phone HBT PA Management ICs
MAX1820	Obsolete	WCDMA Cellular Phone 600mA Buck Regulators
MAX1821	PRODUCTION	WCDMA Cellular Phone 600mA Buck Regulators
MAX1685	PRODUCTION	Low-Noise, 14V Input, 1A, PWM Step-Down Converters
MAX1684	PRODUCTION	Low-Noise, 14V Input, 1A, PWM Step-Down Converters
MAX1692	PRODUCTION	Low-Noise, 5.5V Input, PWM Step-Down Regulator

Evaluation Kits

Evaluation Kit for the MAX1572

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Features and Benefits

2MHz PWM Switching
800mA Guaranteed Output Current
Power-Saving Modes: Pulse Group/Pulse Skip/Forced PWM
Voltage-Positioning Load Transients
5mV_P-P Output Ripple
Tiny 2.2µH Inductor
10µF Ceramic Output Capacitor
Low 0.1µA Shutdown Current
Soft-Start with Zero Inrush Current
170ms (min) Active-Low RESET Output
Thin QFN IC Package: 4mm x 4mm x 0.8mm
Fully Assembled and Tested

Product Details

The MAX1572 evaluation kit (EV kit) is a fully assembled and tested circuit board that evaluates the MAX1572 PWM step-down DC-DC converter. The circuit operates from 2.6V to 5.5V and has a fixed 1.5V output capable of delivering 800mA. It also provides an active-low RESET output. The EV kit can be used to evaluate other output voltage versions of the MAX1572 by replacing the IC.