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MAX1692

Low-Noise, 5.5V Input, PWM Step-Down Regulator

Tiny Switcher Delivers 600mA and 10x Better Performance Than LDO

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX1692 is a low-noise, pulse-width-modulated (PWM), DC-DC step-down converter. It powers logic and transmitters in small wireless systems such as cellular phones, communicating PDAs, and handy-terminals. The device features an internal synchronous rectifier for high efficiency; it requires no external Schottky diode. Excellent noise characteristics and fixed-frequency operation provide easy post-filtering. The MAX1692 is ideally suited for Li-Ion battery applications. It is also useful for +3V or +5V fixed input applications.

The device operates in one of four modes. Forced PWM mode operates at a fixed frequency regardless of the load. Synchronizable PWM mode allows an external switching frequency to control and minimize harmonics. Idle Mode™ (PWM/PFM) extends battery life by switching to a PFM pulse-skipping mode during light loads. Shutdown mode places the device in standby, reducing quiescent supply current to under 0.1µA.

The MAX1692 can deliver over 600mA. The output voltage can be adjusted from 1.25V to V_IN with the input range of +2.7V to +5.5V. Other features of the MAX1692 include high efficiency, low dropout voltage, and a 1.2%-accurate 1.25V reference. It is available in a space-saving 10-pin µMAX package with a height of only 1.11mm.

Data Sheet

Download	Rev 0	(PDF, 160kB)
E-Mail

An evaluation kit is available: MAX1692EVKIT

Key Features

+2.7V to +5.5V Input Range
Adjustable Output from 1.25V to V_IN
600mA Guaranteed Output Current
95% Efficiency
No Schottky Diode Required
85µA Quiescent Current
100% Duty Cycle in Dropout
750kHz Fixed-Frequency PWM Operation
Synchronizable Switching Frequency
Accurate Reference: 1.25V (±1.2%)
Small 10-Pin µMAX Package

Applications/Uses

Battery-Operated Devices (1 Li+ or 3 NiMH/NiCd)
Cell Phones
Cordless Phones
CPU I/O Supplies
Notebook Chipset Supplies
PDAs and Handy-Terminals

Key Specifications:

Step-Down Switching Regulators

Part Number

V_IN
(V)

V_OUT
(V)

Max. I_OUT
(A)

Output Adjust. Method

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

Smallest Available Pckg.
(mm²)

Budgetary Price

min

max

min

max

≥

≤

max w/pins

See Notes

MAX1692

2.7

5.5

1.25

5.5

0.6

Preset

Resistor

750

µMAX/10

15.4

$2.30 @1k

See All Step-Down Switching Regulators (284)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuit

Application Notes

Application Note 473		Integrated Power Supplies are Highly Reliable and Compact Postregulators
Reference Design 478		Current-Limit Circuit for the Buck Regulator
Application Note 479		All-Ceramic 320mA Step-Down Converter for USB
Application Note 668		Managing Noise in Cell-Phone Handsets
Application Note 1014		Design Case Study: Designing a Power Supply for a Portable, Wireless Contact Manager
Application Note 2018		Protection From Blackouts: Dirt Cheap to Fully Integrated
Reference Design 3241		Charging Batteries Using USB Power

Reliability Reports

Reliability Report:	MAX1692.pdf
Show FIT data for:

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1692EUB			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1692EUB+			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1692EUB+T			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1692EUB-T			Active	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Notes and Comments

No external schottky required

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Evaluation Kits

MAX1692EVKIT

Evaluation Kit for the MAX1692

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