LTC3554 View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC3554

Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators

Linear Technology 

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Typical Application

LTC3554/LTC3554-1/

LTC3554-2/LTC3554-3

4.35V TO 5.5V

USB INPUT

U1

20 VBUS

VOUT 18

RPROG

1.87k

15 NTC

CHRG 14

LTC3554

16 PROG

BAT 17

SYSTEM LOAD

C1

10µF

+ 3 CELL

ALKALINE

OR LITHIUM

1 HPWR

19 SUSP

BVIN 12

C2

2.2µF

9 PWR_ON1

2

10

4

8

3

5

PB1

FSEL

STBY

PGOOD

PWR_ON2

PBSTAT

ON

GND

SW1 13 L1 10µH

C3

10pF

FB1 6

L2

11 10µH

SW2

C5

10pF

FB2 7

2.5V

RUP1

1M

RLO1

464k

1.8V

RUP2

590k

RLO2

464k

C4

10µF

C6

10µF

R4

R2

R3

100k

100k

100k

U2

I/O

CORE

µC

PBSTAT

PGOOD

STBY

FSEL

EN

SUSP

HPWR

3554 F14

Figure 14. 3-Cell Alkaline/Lithium with PowerPath (Charger Disabled)

3554123ff

33

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