Maxim > Products > Power and Battery Management > MAX847

MAX847

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

Complete Power Supply and Monitoring System with SPI™ Interface Simplifies Design, Saves Cost and Space

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX847 is a complete power-supply and monitoring system for two-way pagers or other low-power digital communications devices. It requires few external components. Included on-chip are:

A 1-cell input, 80mA output, synchronous-rectified boost DC-DC regulator with a digitally controlled +1.8V to +4.9V output
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

An evaluation kit for the MAX847 (MAX847EVKIT) is available to aid in design and prototyping.

Data Sheet

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

An evaluation kit is available: MAX847EVKIT

Key Features

80mA Output from 1 Cell at 90% Efficiency
13µA Idle Mode™ (coast) Current
Selectable Low-Noise PWM or Low-Current 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

1-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
MAX847EEI			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
MAX847EEI+			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
MAX847EEI+T			Active	QSOP; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX847EEI-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

Similar Products by Function

MAX769

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

Evaluation Kits

MAX847EVKIT

Evaluation Kit for the MAX847

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