RT9901 datasheet(2/19 Pages) RICHTEK

Part #	RT9901

Description	4 Channel DC/DC Converters IC with High-Efficiency Step-Up and Step-Down

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Manufacturer	RICHTEK [Richtek Technology Corporation]

Direct Link	http://www.richtek.com

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RT9901

Preliminary

2

DS9901-12 August 2007

www.richtek.com

Typical Application Circuit

Figure 1. Typical Application Circuit from 1-cell Li+ Battery

1-cell Li+ Battery 3.4V to 4.2V

VDD3

ENM

CX

FB3

CPFB

EN1

LX3

COMP1

SS

EN3

EN2

COMP2

COMP3

LX2

VDD2

LBI

LBO

FB1

VDD1

LX1

FB2

4.7

μH

IGBT Driver

5V/50mA

14

20k

30k

4.7nF

1nF

4.7

μH

3.3V/500mA

Low Battery

Warning Output

(Open Drain)

2

3

32

1

30

15

13

5

64

23

24

21

22

28

27

29

25

26

8

10

20

12

11

17

18

19

9

RT9901

VDDC

22nF

1nF

680k

130k

10

μF x 2

16 7, 31,

Exposed Pad (33)

680k

470k

100pF

150k

10

μF x 4

10

μF

30k

1nF

100pF

200k

220k

4.7μH

1.5V/500mA

VBAT

10

μF x 4

10

μF x 4

10

μF

0.1

μF

VBAT

10

μF x 2

10

μF x 2

SS0520

10

μF

130k

100pF

Chip Enable

R1

R2

R3

R4

R5

R6

R7

R8

R9

R10

R11

R12

R13

R14

C1 to C2

C3

C4

C5

C6

C7 to C8

C9

C10

C11

C12

C13 C14

C15

C16

C17 to C20

C21 to C24

C23

C25 to C26

D1

D2

D3

L1

L2

L3

C27 to C30

VBAT

RT9701CB

VIN

EN

VOUT

GND

5V/500mA

10uF

Chip Enable

1

2

3

4

5

1

μF

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