FAN5182(2005) View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

View to exact match

FAN5182
(Rev.:2005)

Adjustable Output, 1-, 2-, or 3-Phase Synchronous Buck Controller

Fairchild Semiconductor 

Application Circuit

VIN

12 V

VIN RTN

L1

1µH

+ C1

2700µF

16V

+ C2

2700µF

16V

D1

(optional)

C3

1µF

D2

(optional)

C7

1µF

D3

(optional)

C11

1µF

U2

C4

FAN5009 100nF

1 BOOT HDRV 8

2 PWM

SW 7

3 OD

PGND 6

4 VCC

LDRV 5

C5

4.7µF

Q2

FDD8896

Q1

FDD6296

L2

600nH / 1.4mΩ

C6

2.2nF

R1

2.2Ω

1200µF / 6.3V x 5

15mΩ ESR (each)

+

C17

+

C21

U3

C8

FAN5009 100nF

1 BOOT HDRV 8

2 PWM

SW 7

3 OD

PGND 6

4 VCC

LDRV 5

Q4

FDD8896

C9

4.7µF

Q3

FDD6296

L3

600nH / 1.4mΩ

C10

2.2nF

R2

2.2Ω

4.7µFx10

6.3V

MLCC

U4

C12

FAN5009 100nF

1 BOOT HDRV 8

2 PWM

SW 7

3 OD

PGND 6

4 VCC

LDRV 5

Q6

FDD8896

C13

4.7µF

Q5

FDD6296

L4

600nH / 1.4mΩ

C14

2.2nF

R3

2.2Ω

VOUT

1.8 V

55A

VOUT

RTN

POWER

GOOD

ENABLE

RLIM

287kΩ

R4

10Ω

C15

1µF

RR

332kΩ

RB1

1.00kΩ

RB2

1.24kΩ

RA

6.04kΩ

CA

1.2nF

CFB

100pF

CDLY

68nF

RDLY

261kΩ

RT

255kΩ

U1

FAN5182

1 VCC

PWM1 20

2 FBRTN

PWM2 19

3 FB

PWM3 18

4 COMP

SW1 17

5 PWRGD

SW2 16

6 EN

SW3 15

7 DELAY

GND 14

8 RT

CSCOMP 13

9 RAMPADJ CSSUM 12

RSW2

*

RSW1

*

RSW3

*

RCS

100kΩ

RPH3 RPH2 RPH1

140kΩ 140kΩ 140kΩ

CCS

5.6nF

10 ILIMIT

CSREF 11

Figure 5. 1.8V, 55A Application Circuit

( Consult Fairchild Sales for an updated version of the Application Circuit )

8

www.fairchildsemi.com

FAN5182 Rev. 1.0.1

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