LTC3555 View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC3555

High Effi ciency USB Power Manager + Triple Step-Down DC/DC

Linear Technology 

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LTC3555/LTC3555-X

TYPICAL APPLICATION

Watchdog Microcontroller Operation

USB/WALL

4.5V TO 5.5V

C1

10μF

10k

T

2k

PUSH BUTTON

MICROCONTROLLER

25

VBUS

8.2Ω

0.1μF

3

NTC

20

PROG

2

CLPROG

3k

SW 26

VOUT 24

GATE 22

BAT 23

GND 29

CHRG 21

SW1 17

1

LDO3V3

1μF

8

DVCC

19

FB1

LTC3555/

LTC3555-X

VIN1 18

SW2 6

2

9,10 I2C

FB2 4

L1

3.3μH

MP1

+

Li-Ion

L2

4.7μH

1.02M

324k

L3

4.7μH

1.02M

365k

C2

22μF

RED

510Ω

TO OTHER

LOADS

3.3V

400mA

10pF

10μF 1μF

MEMORY

1.61V TO 3.03V

400mA

I/O

10pF

10μF 1μF

MICROPROCESSOR

C1: MURATA GRM21BR61A106KE19

C2: TDK C2012X5R0J226M

L1: COILCRAFT LPS4018-332LM

L2, L3: TOKO 1098AS-4R7M

L4: TOKO 1098AS-2R0M

MP1: SILICONIX Si2333

16

7

13

27

28

EN1

EN2

EN3

ILIM0

ILIM1

VIN2 5

L4

SW3 12 2μH

FB3 14

715k

806k

0.8V TO 1.51V

1A

CORE

POR

10pF

22μF 2.2μF

10k

VIN3 11

RST3 15

3555 TA02

3555fd

30

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