Datasheet

ADP1877 Data Sheet
Rev. D | Page 28 of 32
VCCO
VCCO
VCCO
845kΩ
EN1
SYNC
100nF
TO
VIN
845kΩ
VIN
VCCO
VDL
AGND
FREQ
EN2
SW1
DH1
PGND1
DL1
DL2
PGND2
DH2
SW2
TRK2
FB2
COMP2
RAMP2
SS2
PGOOD2
ILIM2
BST2
TRK1
FB1
COMP1
RAMP1
SS1
PGOOD1
ILIM1
BST1
ADP1877
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
32 31 30 29 28 27 26 25
9 10 11 12 13 14 15 16
18.7kΩ
220pF
2.2n
F
12.7kΩ
220pF
3.9nF
100nF
1µF
0.1µF
0.1µF
1µF
1µF
R
ILIM2
3.7kΩ
R
DH2
3Ω
L2
M4
M3
R
CSG2
22kΩ
COUT
22
COUT
21
CIN2
V
OUT2
1.05V
20A
VIN
R
ILIM1
3.7kΩ
L1
M2
M1
R
CSG1
22kΩ
COUT
12
1.2nF
4Ω
COUT
11
CIN1
CIN
V
OUT1
1.8V
20A
VIN = 10V TO 14V
R
TOP2
7.5kΩ
R
BOT2
10kΩ
CIN1, CIN2: 10µF/X7R/25V/1210 × 2, GRM32DR71E106KA12, MURATA
COUT
11
, COUT
21
: 680µF/2.5V/POSCAP × 2, 2R5TPD680M5, SANYO
COUT
12
, COUT
22
: 22µF/X5R/0805/6.3V × 3, GRM21BR60J226ME39, MURATA
f
SW
= 300kHz
CIN = 180µF/20V, 20SP180M, OSCON, SANYO
L1, L2: 1.3µH, WURTH ELEKTRONIK, 7443551130
M1, M3: BSC080N03LS
M2, M4: BSC030N03LS
R
TOP1
20kΩ
R
BOT1
10kΩ
2Ω
1.2nF
4Ω
08299-020
R
DH1
3Ω
R
DL1
3Ω
R
DL2
3Ω
1MΩ
1MΩ
Figure 42. Typical 20 A Operating Circuit