Datasheet

18
LTC1879
1879f
TYPICAL APPLICATIO
U
Dual Li-Ion to 1.8V/1A Regulator Using All Ceramic Capacitors
5
12
6
11
3
1
1879 TA02
SWP
SWP
SWN
SWN
V
FB
I
TH
R
C
150k
PLL_LPF
RUN/SS
PGOOD
SGND
8
9
PV
IN
PV
IN
7
10
PGND
PGND
SYNC/MODE
R
SVIN
10Ω
LTC1879
L1
8.2µH
V
OUT
1.8V
1A
V
IN
3V TO 8.4V
GND
C
IN1
10µF
C
OUT
47µF
1513
14
2
16
4
SV
IN
C
SVIN
0.1µF
C
C1
47pF
BOLD LINES INDICATE HIGH CURRENT PATHS
C
C2
220pF
C
IN1
, C
IN2
: TAIYO YUDEN CERAMIC LMK325BJ106MN
C
OUT
: TDK CERAMIC C4532X5R0J476M
L1: TOKO A916CY-8R2M
V
OUT
: 1A IS THE MAXIMUM OUTPUT CURRENT
R
SS
1M
R
PG
100k
C
SS
0.1µF
C
IN2
10µF
R1
523k
R2
412k
OUTPUT CURRENT (mA)
60
EFFICIENCY (%)
80
100
50
70
90
0.1 10 100 1000
1879 TA04
40
1
V
IN
= 3.6V
V
IN
= 7.2V
V
IN
= 5V
V
OUT
= 1.8V
Burst Mode OPERATION
Efficiency vs Output Current