MAX1637

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Miniature, Low-Voltage, Precision Step-Down Controller

Low-Voltage, Precision Step-Down Controller for Portable CPU Power

Data Sheet (Rev. 2) Product Selection Table

Part Models: 2
1ku List Price: Starting From $6.27

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Overview

±2% DC Accuracy
0.1% (typ) DC Load Regulation
Adjustable Switching Frequency to 350kHz
Idle Mode™ Pulse-Skipping Operation
1.10V to 5.5V Adjustable Output Voltage
3.15V Minimum IC Supply Voltage (at V_CC pin)
Internal Digital Soft-Start
1.1V ±2% Reference Output
1µA Total Shutdown Current
Output Overvoltage Crowbar Protection
Output Undervoltage Shutdown (foldback)
Tiny 16-Pin QSOP Package

The MAX1637 synchronous, buck, switch-mode power-supply controller generates the CPU supply voltage in battery-powered systems. The MAX1637 is a stripped-down version of the MAX1636 in a smaller 16-pin QSOP package. The MAX1637 is intended to be powered separately from the battery by an external bias supply (typically the +5V system supply) in applications where the battery exceeds 5.5V. The MAX1637 achieves excellent DC and AC output voltage accuracy. This device can operate from a low input voltage (3.15V) and delivers the excellent load-transient response needed by upcoming generations of dynamic-clock CPUs.

Using synchronous rectification, the MAX1637 achieves up to 95% efficiency. 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 caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Powerful 1A on-board gate drivers ensure fast external N-channel MOSFET switching.

The MAX1637 features 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-bar pin enables fixed-frequency mode, for lowest noise under all load conditions. For a stand-alone device that includes a +5V VL linear regulator and low-dropout capabilities, refer to the MAX1636 data sheet.

Applications

Handy-Terminals, PDAs
Notebook Computers
Subnotebook Computers

Part Models: 2
1ku List Price: Starting From $6.27

Documentation

Data Sheet 1

MAX1637: Miniature, Low-Voltage, Precision Step-Down Controller Data Sheet (Rev.2) 09/26/2005

Design Note 3

A 3.3V Input Step-Down Converter for CPU Cores 03/01/2001

DDR Memory-Termination Supply is Flexible for 2.5V and 1.8V Memory Systems 07/17/2002

Auto-Retry Controller Suits Telecom Applications 04/14/2003

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
MAX1637EEE+	16-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1637EEE+T	16-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 7, 2023 - 2361C WAFER FAB
		pcn_2361c
MAX1637EEE+
MAX1637EEE+T	Obsolete

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
MAX1636		Low-Voltage, Precision Step-Down Controller for Portable CPU Power

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