LTC1559CS-3.3 데이터 시트보기 (PDF) - Linear Technology

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LTC1559CS-3.3

Backup Battery Controller with Fixed Output

Linear Technology 

LTC1559-3.3/LTC1559-5

PIN FUNCTIONS

LOBAT (Pin 9): Low Backup Battery Detector Output. This

is an open-drain output with an internal weak pull-up. It is

asserted if the NiCd cell terminal voltage drops below

1.0V. This pin is pulled high if the LTC1559 is in trickle

charge mode.

RESET (Pin 12): System Reset, Active High. This is a TTL-

compatible output driver. It can connect to systems that

require active high logic. The RESET output will go high if

RESET is pulled low.

BLOCK DIAGRAM

SW

CTL

PS

+

–

VREF

VCC

VREF

–

+

CHARGER

LEVEL SENSE

AND DEBOUNCE

GAS GAUGE

P1

VCC/VBAK

N1

BOOST/BACKUP

LOGIC

RESET

GENERATOR

+

–

VBAK

BACKUP

RESET

RESET

LOBAT

THERMAL

LIMIT

UVLO

DETECTOR

SHDN

SHUTDOWN

LOGIC

BANDGAP

VREF = 1.272V

1559 BD

U

W

SWITCHING WAVEFORMS

Simplified LTC1559 Connections in a Battery Backup System

22µH

1.2V

NiCd

SW

RESET

LTC1559

PS

VCC

BACKUP VBAK

TO

SYSTEM

CONTROL

BACKUP

VBAT

MAIN

BATTERY

VIN

VOUT

MAIN SYSTEM

REGULATOR

QEXT

SYSTEM

VCC

COUT

1559 SW01

FOR MORE DETAILED CIRCUIT APPLICATION SCHEMATICS,

PLEASE REFER TO THE TYPICAL APPLICATIONS SECTION

Cold Power Boot-Up (Main Battery Replaced/Turned On)

RATED BATTERY TERMINAL VOLTAGE

1

VBAT

2

4

RATED VCC VOLTAGE

3

–5.5% (LTC1559-3.3)

PS

– 6% (LTC1559-5)

VCC

RESET

200ms

BACKUP

1559 SW02

6

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