LTC1559CGN-3.3 데이터 시트보기 (PDF) - Linear Technology

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LTC1559CGN-3.3

Backup Battery Controller with Fixed Output

Linear Technology 

LTC1559-3.3/LTC1559-5

TYPICAL APPLICATION

LTC1559-3.3 Backup System with an LTC1435 Main System Regulator

(LTC1435 Output Sense at the Source of Q11, LTC1559’s PS Pin Is Grounded)

L11†

22µH

BACKUP + C11

18

R14

14k

BATTERY

1.2V

NiCd

1µF

SW VBAK 7

6.3V

3

CTL

VCC

+

C12

R15

RESET

LTC1559-3.3

2

5

1µF

100k

PUSH-BUTTON

GND RESET

4

6

PS BACKUP

RESET

BACKUP

MAIN

BATTERY

4.5 TO 28V

+ CIN

22µF

35V

×2

CC

330pF

CC2

51pF

CSS

0.1µF

RC

10k

13 16

9

VIN

EXTVCC

TG

14

SW

4 SFB

BOOST 15

LTC1435

6

12

VOSENSE INTVCC

3

ITH

SENSE + 8

2 RUN/SS SENSE – 7

D1

C4

CMDSH-3 0.1µF

C5

1000pF

1

COSC

SGND

5

COSC

68pF

BG

PGND

10

11

+

C3

4.7µF

16V

Q1

N-CHANNEL

Si4412DY

Q2

N-CH

Si4412DY

C2

0.1µF

L1*

10µH

D2

MBRS140T3

C1

100pF

Q11

P-CHANNEL RSENSE**

Si9424DY 0.033Ω

VOUT

+ COUT 3.3V

100µF

10V

×2

C6

100pF

R1

35.7k

1%

R5

20k

1%

*SUMIDA CDRH125-10

**IRC LR2010-01-R033-F

†SUMIDA CD54-220

1559 TA04

Description

With its SENSE pin at the source of Q11, the LTC1435 can

raise VOUT above VCC(rated voltage) – 5.5% once the main

battery is restored. Thus, the LTC1559 does not use the PS

pin to sense the LTC1435’s output during backup mode.

The PS pin is grounded in this case. Please refer to the

Applications Information section for more details.

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Complete Power Management Controller for Battery

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LTC1558

Battery Backup Controller with

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Similar to LTC1559 Except That It Backs up the Main System Regulator’s

Input, Allowing Backup of Multiple Output Voltages

PowerPath and Burst Mode are trademarks of Linear Technology Corporation.

20 Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408)432-1900 q FAX:(408)434-0507 q www.linear-tech.com

1559f LT/TP 1098 4K • PRINTED IN USA

© LINEAR TECHNOLOGY CORPORATION 1998

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