MIC2778-1YM5TR Micrel Semiconductor, MIC2778-1YM5TR Datasheet

MIC2778-1YM5TR

Manufacturer Part Number

MIC2778-1YM5TR

Description

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC2778-1BM5TR.pdf (6 pages)

Specifications of MIC2778-1YM5TR

Date_code

06+

Packing_info

SOT-153

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General Description

The MIC2778 is a voltage monitor—uniquely designed to

detect two separate voltage thresholds—combined with a

delay generator and logic. It is designed for monitoring the

battery supply of portable digital systems, particularly PDAs,

pagers, and cellular telephones.

High- and low-voltage thresholds can be adjusted inde-

pendently, allowing for wide hysteresis. Voltage detection

thresholds are accurate to 2%.

If the battery voltage falls below the low-voltage threshold,

the output (RST) is asserted and latched, preventing system

operation until the battery is replaced or recharged. Internal

logic prevents the output from chattering due to battery

recovery or load removal. The output is asserted for 140ms

(minimum) when a fresh battery is inserted. For applications

not requiring built-in delay, see MIC841.

The IC’s power supply input is separate from the detector

inputs, allowing the MIC2778 to be powered from a down-

stream supply, such a boost converter. Supply current is

extremely low (1µA, typical), making it ideal for portable

applications.

A high-precision 1% grade is available. The MIC2778 is sup-

plied in Micrel’s IttyBitty™ 5-lead SOT-23-5 package.

Ordering Information

* Underscore indicates a Pb-Free part.

Typical Application

IttyBitty™ is a trademark of Micrel, Inc.

January 2005

MIC2778

Standard

MIC2778-2BM5

MIC2778-1BM5

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

Li-Ion

Cell

Marking

UFB

UFA

Part Number

Pb-Free

MIC2778-2YM5

MIC2778-1YM5

604k

56k

340k

Cellular Telephone Battery Monitor

VDD

LTH

HTH

BAT(hi)

BAT(lo)

MIC2778

= 3.6V

= 3.1V

GND

R S T

Marking

UFB*

UFA*

100k

Features

• Optimized for PDAs, cellular telephones, pagers,

• Independently adjustable high- and

• Internal logic prevents battery-voltage-ﬂuctuation chatter

• High ±2% voltage threshold accuracy; 1% available

• Built in 140ms (minimum) delay deglitches output

• Extremely low 1µA typical supply current

• For applications not requiring built-in delay, see MIC841

• Immune to brief power supply transients

• 5-lead SOT-23 package

Applications

• PDAs

• Pagers

• Cordless phones

• Consumer electronics

• Embedded controllers

• Personal electronics

Voltage Monitor with Adjustable Hysteresis

MIC5207-3.0BM5

and other battery-powered devices

low-voltage thresholds

E N

Accurary

GND

OUT

B Y P

470pF

Temperature Range

MIC2778

-40°C to +85°C

3.0V

4.7µF

OUT

SOT-23-5

Package

M9999-011405

Micrel

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