28

LTC1629/LTC1629-PG

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

©LINEAR TECHNOLOGY CORPORATION 1999

1629f LT/TP 0100 4K • PRINTED IN USA

TYPICAL APPLICATIO

RELATED PARTS

PART NUMBER

DESCRIPTION

COMMENTS

LTC1435/LTC1435A

High Efficiency Synchronous Step-Down Switching Regulator

Burst Mode

LTC1436A-PLL

High Efficiency Low Noise Synchronous Step-Down Switching Regulator

Adaptive Power

LTC1438/LTC1439

Dual High Efficiency Low Noise Synchronous Step-Down Switching Regulators

POR, Auxiliary Regulator

LTC1438-ADJ

Dual Synchronous Controller with Auxiliary Regulator

POR, External Feedback Divider

LTC1538-AUX

Dual High Efficiency Low Noise Synchronous Step-Down Switching Regulator

Auxiliary Regulator, 5V Standby

LTC1539

Dual High Efficiency Low Noise Synchronous Step-Down Switching Regulator

5V Standby, POR, Low-Battery,

Aux Regulator

LTC1530

High Power Step-Down Switching Regulator Controller

High Efficiency 5V to 3.3V Conversion

at Up to 15A

LTC1628/LTC1628-PG Dual High Efficiency, PolyPhase Synchronous Step-Down Switching Regulator

Constant Frequency, Standby,

5V and 3.3V LDOs, PGOOD

LTC1702/LTC1703

Dual High Efficiency, PolyPhase Synchronous Step-Down Switching Regulator

500kHz, 25MHz GBW, Voltage Mode

LTC1708-PG

Dual High Efficiency, PolyPhase Synchronous Step-Down Switching Regulator

Constant Frequency, 5-Bit VID,

Standby 5V, 3.3V, PGOOD

LTC1709

High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator

1.3V

with 5-Bit VID

Accurate Current Sharing, 3.5V

LTC1735

High Efficiency Synchronous Step-Down Controller

Burst Mode Operation, 16-Pin Narrow SSOP,

Fault Protection, 3.5V

LTC1736

High Efficiency Synchronous Step-Down Controller with 5-Bit VID

Output Fault Protection, Power Good,

24-Pin SSOP, 3.5V

LTC1929

High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator

Low Cost, 2-Phase Current Mode

Adaptive Power and Burst Mode are trademarks of Linear Technology Corporation.

SWITCHING FREQUENCY = 250kHz

MI, M3: IRF7811

M2, M4: IRF7809

L1, L2: 1

µH SUMIDA CEPH149-1R0MC

D3, D4: CENTRAL CMDSH-3TR

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

CLKOUT

TG1

SW1

BOOST1

BG1

PGND

BG2

BOOST2

SW2

TG2

PGOOD

RUN/SS

EAIN

PLLFLTR

PLLIN

PHASMD

SGND

–

+

LTC1629-PG

M4

M3

0.1

µF

17.8k

13.2k

10k

3.3k

16.5k

1000pF

1000pF

1000pF

100pF

33pF

M2

M1

D1

UPS840

D2

UPS840

0.47

µF

POWER

GOOD

100k

4.7

µF

6.3V

0.1

µF

1

µF,25V

5V

D4

D3

10

Ω

0.47

µF

3.3V/30A

5V TO

16V

L1

0.003

Ω

L2

0.003

Ω

1629 TA02

1000pF

Figure 12. 3.3V/30A Power Supply with Active Voltage Positioning