Datasheet

ADP1877 Data Sheet
Rev. D | Page 30 of 32
VCCO
78.7kΩ
VCCO
121kΩ
EN1
SYNC
100nF
TO
VIN
121kΩ
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
5.34kΩ
33pF
1.8n
F
8.66kΩ
33pF
1nF
100nF
1µF
0.1µF
0.1µF
1µF
1µF
R
ILIM2
4.99kΩ
L2
M4
M3
R
CSG2
47kΩ
COUT2
CIN2
V
OUT2
1.8V
1.8A
VIN
R
ILIM1
4.99kΩ
L1
M2
M1
R
CSG1
47kΩ
COUT1
CIN1
V
OUT1
1.05V
1.8A
VIN = 3V TO 5.5V
CIN1, CIN2: 4.7µF/X5R/16V/0805 × 2, GRM219R60J475KE19, MURATA
M1, M2, M3, M4: Si2302ADS, SOT23
COUT1, COUT2: 22µF/X5R/0805/6.3V, GRM21BR60J226ME39, MURATA
f
SW
= 800kHz
L1, L2: 1µH, D62LCB1R0M, TOKO
5Ω
08299-022
R
TOP2
20kΩ
R
BOT2
10kΩ
R
TOP1
73.2kΩ
R
BOT1
10kΩ
1MΩ
1MΩ
Figure 44. Typical Low Current Application with V
IN
< 5.5 V