Datasheet > MIC2778

MIC2778

更新时间： 2024-11-18 14:56:03

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
6页	167K
描述
The MIC2779 is a voltage monitor--uniquely designed to detect two separate voltage thresholds--com

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MIC2778 数据手册

MIC2778

Micrel

MIC2778

Voltage Monitor with Adjustable Hysteresis

General Description

Features

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.

• Optimized for PDAs, cellular telephones, pagers,

and other battery-powered devices

• Independently adjustable high- and

low-voltage thresholds

• 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

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.

Applications

• PDAs

• Pagers

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.

• Cordless phones

• Consumer electronics

• Embedded controllers

• Personal electronics

Ahigh-precision 1% grade is available. The MIC2778 is sup-

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

Ordering Information

Part Number

Accurary

Temperature Range

Package

Standard

Marking

Pb-Free

Marking

MIC2778-2BM5

MIC2778-1BM5

UFB

UFA

MIC2778-2YM5

MIC2778-1YM5

UFB*

UFA*

-40°C to +85°C

SOT-23-5

* Underscore indicates a Pb-Free part.

Typical Application

V_OUT

3.0V

MIC5207-3.0BM5

OUT

BYP

GND

470pF

4.7µF

MIC2778

Li-Ion

Cell

100k

604k

VDD

LTH

R ST

56k

HTH GND

340k

V_BAT(hi)= 3.6V

V_BAT(lo)= 3.1V

Cellular Telephone Battery Monitor

IttyBitty™ is a trademark of Micrel, Inc.

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

M9999-011405

January 2005

12 3 4 5 6

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与MIC2778相关器件

型号	品牌	获取价格	描述	数据表
MIC2778_05	MICREL	获取价格	Voltage Monitor with Adjustable Hysteresis
MIC2778-1BM5	MICREL	获取价格	Voltage Monitor with Adjustable Hysteresis Preliminary Information
MIC2778-1BM5	MICROCHIP	获取价格	Power Supply Support Circuit, Adjustable, 1 Channel, +1.24VV, PDSO5, SOT-23, 5 PIN
MIC2778-1BM5TR	MICROCHIP	获取价格	Power Supply Support Circuit, Adjustable, 1 Channel, PDSO5, SOT-23, 5 PIN
MIC2778-1YM5TR	MICROCHIP	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5, LEAD FREE, SOT-23, 5 PIN
MIC2778-1YM5-TR	MICROCHIP	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5
MIC2778-2BM5	MICREL	获取价格	Voltage Monitor with Adjustable Hysteresis Preliminary Information
MIC2778-2BM5TR	MICREL	获取价格	暂无描述
MIC2778-2YM5	MICROCHIP	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5
MIC2778-2YM5TR	MICROCHIP	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5, LEAD FREE, SOT-23, 5 PIN

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