Datasheet > MIC2779_06

MIC2779_06

更新时间： 2024-11-20 04:39:55

品牌	Logo	应用领域
麦瑞 - MICREL		/
页数	文件大小	规格书
6页	148K
描述
Voltage Monitor with Adjustable Hysteresis

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MIC2779_06 数据手册

MIC2779

Micrel, Inc.

MIC2779

Voltage Monitor with Adjustable Hysteresis

General Description

Features

The MIC2779 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 requiring open-drain output, see

MIC2778/MIC833

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 or RST is asserted and latched, preventing

system operation until the battery is replaced or recharged.

Internallogicpreventstheoutputfromchatteringduetobattery

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

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

requiring open-drain output, see MIC2778/MIC833.

• Immune to brief power supply transients

• 5-pin SOT-23 package

Applications

• PDAs

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

inputs, allowing the MIC2779 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.

• Pagers

• Cordless phones

• Consumer electronics

• Embedded controllers

• Personal electronics

Ahigh-precision 1% grade is available. The MIC2779 is sup-

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

Typical Application

V_OUT

3.0V

MIC5207-3.0BM5

OUT

BYP

GND

470pF

MIC2779L

Li-Ion

Cell

4.7µF

604k

VDD

LTH

/RST

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

January 2006

MIC2779

12 3 4 5 6

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与MIC2779_06相关器件

型号	品牌	获取价格	描述	数据表
MIC2779H-1BM5	MICREL	获取价格	Voltage Monitor with Adjustable Hysteresis Preliminary Information
MIC2779H-1BM5TR	ROCHESTER	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5, SOT-23, 5 PIN
MIC2779H-1YM5-TR	MICROCHIP	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5
MIC2779H-2BM5	MICREL	获取价格	Voltage Monitor with Adjustable Hysteresis Preliminary Information
MIC2779H-2BM5	ROCHESTER	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5, SOT-23, 5 PIN
MIC2779H-2BM5TR	MICREL	获取价格	Power Supply Support Circuit, Adjustable, 1 Channel, PDSO5, SOT-23, 5 PIN
MIC2779L-1BM5	MICREL	获取价格	Voltage Monitor with Adjustable Hysteresis Preliminary Information
MIC2779L-1BM5	ROCHESTER	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5, SOT-23, 5 PIN
MIC2779L-1YM5-TR	MICROCHIP	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5
MIC2779L-2BM5	MICREL	获取价格	Voltage Monitor with Adjustable Hysteresis Preliminary Information

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