FAN5182 Datasheet, PDF (8/18 Pages) Fairchild Semiconductor – Adjustable Output 1, 2, or 3-Phase Synchronous Buck Controller

Application Circuit
V_IN
12 V
V_IN 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
V_OUT
1.8 V
55A
V_OUT
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
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FAN5182 Rev. 1.0.1