Datasheet

LTC3122
22
3122fa
For more information www.linear.com/LTC3122
Typical applicaTions
Single Li-Cell 3-LED Driver, 2.5V/4.2V to 350mA
3122 TA07a
V
IN
SD
PWM/SYNC
RT
V
CC
V
OUT
CAP
FB
V
C
LTC3122
SGND PGND
R
C
2k
C
C
3.9nF
SW
L1
3.3µH
C
VCC
4.7µF
V
CC
C1
100nF
LT1006
C
OUT1
22µF
R
T
57.6k
V
IN
2.5V TO
4.2V
C
IN
4.7µF
ONOFF
C
IN
, C
VCC
: 4.7µF, 6.3V, X7R, 1206
C1: 100nF, 6.3V, X7R, 1206
C
OUT
: 22µF, 16V, X7R, 1812
L1: TDK SPM6530T-3R3M
D1, D2, D3: CREE XPGWHT-L1-0000-00G51
+
–
R1
1.02M
R2
30.9k
R
S
0.1Ω
D1
D2
D3
V
IN
(V)
2.5
EFFICIENCH (%)
100
10
POWER LOSS (W)
1
1
0.1
0.1
4.1 4.32.7 2.9 3.1
3122 TA07b
3.93.5 3.73.3
EFFICIENCY
POWER LOSS