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LTC1627

Monolithic Synchronous Step-Down Switching Regulator

Linear Technology 

LTC1627

TYPICAL APPLICATIONS

CITH

47pF

CSS

0.1µF

Double Lithium-Ion to 2.5V/0.5A Regulator

1

8

ITH SYNC/FCB

2

RUN/SS

7

VDR

3

LTC1627

VFB

VIN

6

4

GND

5

SW

* SUMIDA CD54-250

** AVX TPSC107M006R0150

*** AVX TPSC226M016R0375

25µH*

R2

169k

1%

+

R1

80.6k

1%

VOUT

2.5V

0.5A

+

COUT **

100µF

6.3V

VIN ≤ 8.4V

CIN***

22µF

16V

1627 TA01

Dual Output 1.8V/300mA and 3.3V/100mA Application

CITH

47pF

CSS

0.1µF

1

8

ITH SYNC/FCB

2

RUN/SS

7

VDR

3

LTC1627

6

VFB

VIN

4

GND

5

SW +

R3

249k

1%

R4

80.6k

1%

VIN ≤ 8.5V

CIN*

22µF

16V

+

***22µF

6.3V

D1

25µH† MBR0520LT1

1:1

R2 +

100k

1%

* AVX TPSC226M016R0375

** AVX TPSC107M006R0150

*** AVX TAJA226M006R

† COILTRONICS CTX25-1

†† MMSZ4678T1

††† A 10mA MIN LOAD CURRENT

IS RECOMMENDED

R1

80.6k

1%

VSEC†††

3.3V

100mA

D2††

ZENER

1.8V

VOUT

1.8V

0.3A

COUT **

100µF

6.3V

1627 TA02

RELATED PARTS

PART NUMBER

LTC1174/LTC1174-3.3

LTC1174-5

LTC1265

LT®1375/LT1376

LTC1435

LTC1436/LTC1436-PLL

LTC1438/LTC1439

LTC1474/LTC1475

LTC1626

DESCRIPTION

High Efficiency Step-Down and Inverting DC/DC Converters

1.2A, High Efficiency Step-Down DC/DC Converter

1.5A, 500kHz Step-Down Switching Regulators

High Efficiency, Synchronous Step-Down Converter

High Efficiency, Low Noise, Synchronous Step-Down Converters

Dual, Low Noise, Synchronous Step-Down Converters

Low Quiescent Current Step-Down DC/DC Converters

Low Voltage, High Efficiency Step-Down DC/DC Converter

COMMENTS

Monolithic Switching Regulators, IOUT to 450mA,

Burst Mode Operation

Constant Off-Time, Monolithic, Burst Mode Operation

High Frequency, Small Inductor, High Efficiency

16-Pin SO and SSOP

24-Pin Narrow SSOP

Multiple Output Capability

Monolithic, IOUT to 250mA, IQ = 10µA, 8-Pin MSOP

Monolithic, Constant Off-Time, IOUT to 600mA,

Low Supply Voltage Range: 2.5V to 6V

16 Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

1627f LT/TP 0199 4K • PRINTED IN USA

© LINEAR TECHNOLOGY CORPORATION 1998

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