LTC3455EUF View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC3455EUF

Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger

Linear Technology 

BLOCK DIAGRAM

LTC3455/LTC3455-1

USB

5V

1Ω

4.7μF

USB

8

5.6V

USB

CONTROLLER

SUSPEND

6

USBHP

5

VMAX

1k

0.1μF

CHRG

4

TIMER

3

PROG

2

2.49k

GND

25

VBAT

3.3V to 4.2V

4.7μF

2.43M

VBAT 9

AI

16

806k

USB POWER MANAGER

1 1000

– REF

+

R

4R

3.9V –

+

BATTERY CHARGER

1 1000

– 1.23V

+

2.41R

+

CHARGE

CONTROL

R

LBO

ON/OFF

AO

17

806k

1.8V

ON

24

PBSTAT

23

806k

1.8V

–

+ 0.8V

VBAT +

UVLO

3.0V –

μC

PWRON

22

ON2

19

RST

20

MODE

21

HSON

15

200ms RESET PULSE

BURST MODE ENABLE

EXTPWR

EXTPWR

3.32k

+

WALLFB

11

– 1.23V

1.24k

BATTERY PMOS SWITCH

10 VMAX

WALL 5V

1Ω

4.7μF

VMAX

10μF

SWITCHER 1

PWM

DRIVER

ENABLE

–

+ 0.8V

SW1 4.7μH

7

FB1

1

100k

80.6k

1.8V

10μF

SWITCHER 2

PWM

DRIVER

ENABLE

–

+ 0.8V

SW2 4.7μH

12

FB2

18

249k

80.6k

HOT SWAP

ENABLE

HSI

13

HSO

14

3455 BD01

3.3V

10μF

3.3V, HS

1μF

3455fc

9

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