LTC3443 Datasheet, PDF (14/16 Pages) Linear Technology – High Current Micropower 600kHz Synchronous Buck-Boost DC/DC Converter

LTC3443
TYPICAL APPLICATIO S
Li-Ion to 3.3V at 1.2A Converter
L1
6µH
D1
2.8V TO 4.2V
Li-Ion
D2
C1
10µF
4
SW1
5
SW2
9
8
PV_IN
V_OUT
10
LTC3443
12
V_IN
FB
1
11
SHDN/SS
V_C
*
7
2
MODE/SYNC GND
3
PGND
6
PGND
340k
15k
560pF
200k
*1 = Burst Mode OPERATION
0 = FIXED FREQUENCY
C1: TAIYO YUDEN JMK212BJ106MG
C2: TAIYO YUDEN JMK325BJ226MM
D1, D2: PHILLIPS PMEG2010EA
L1: SUMIDA CDRH6D28-6R0NC
220pF
2.2k
V_OUT
3.3V
1.2A
C2
44µF
(2 × 22µF)
3443 TA03a
Efficiency vs Load
100
90 Burst Mode
OPERATION
80
70
60
V_IN = 2.8V
50
40
V_IN = 3.6V
V_IN = 4.2V
30
20
10 WITH SCHOTTKY DIODES:
PHILIPS PMEG2010EA
0
0.1
1
10 100
I_OUT (mA)
1000 10000
3443 TA03b
14
sn3443 3443fs