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MAX769

2 or 3 Cell, Step-Up/Down, Two-Way Pager System IC

Complete Power Supply and Monitoring System Simplifies Design, Saves Cost and Space

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX769 is a complete buck/boost power supply and monitoring system for two-way pagers or other low-power digital communications devices. Few external components are required. Included on-chip are:

An 80mA output, synchronous-rectified, buck/boost DC-DC converter with a digitally controlled +1.8V to +4.9V output. The DC-DC converter is unique, since it provides a regulated output for battery inputs that are both less than and greater than the output voltage, without using transformers.
Three low-noise linear-regulator outputs
Three DAC-controlled comparators for software-driven, 3-channel A/D conversion
SPI™-compatible serial interface
Reset and low-battery (LBO) warning outputs
Charger for NiCd/NiMH, lithium battery, or storage capacitor for RF PA power or system backup
Two 1.8Ω (typical), serial-controlled, open-drain MOSFET switches for beeper or vibrator drive

An evaluation kit for the MAX769 (MAX769EVKIT) is available to aid in design and prototyping.

Data Sheet

Download	Rev 1	(PDF, 176kB)
E-Mail

An evaluation kit is available: MAX769EVKIT

Key Features

Regulated Step-Up/Step-Down Operation
80mA Output from 3 Cells
85% Efficiency
13µA Idle Mode™ (coast) Current
Selectable Low-Noise PWM or Low-Current PFM Operation
PWM Operating Frequency Synchronized to Seven Times an External Clock Source
Operates at 270kHz with No External Clock
Automatic Backup-Battery Switchover

Applications/Uses

2- or 3-Cell-Powered Handheld Equipment
GPS Receivers
Two-Way Paging

Diagram

Typical Operating Circuit

Reliability Reports

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Software/Models

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Ordering Information

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Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX769EEI			Active	QSOP;28 pin;61.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0173 (PDF) Use pkgcode/variation: E28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX769EEI+			Active	QSOP;28 pin;61.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0173 (PDF) Use pkgcode/variation: E28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX769EEI+T			Active	QSOP; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX769EEI-T			Active	QSOP;28 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet

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

Includes RESET and low battery warning outputs, 80mA output from 3 cells

Similar Products by Function

MAX847

1 Cell, Step-Up Two-Way Pager System IC

Evaluation Kits

MAX769EVKIT

Evaluation Kit for the MAX769

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