Datasheet

18
LTC1875
1875f
5
12
6
11
3
1
1875 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
LTC1875
L1
4.7µH
V
OUT
*
1.8V/1.5A
V
IN
3V TO 4.2V
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 JMK316BJ106ML
C
OUT
: TDK CERAMIC C4532X5R0J476M
L1: TOKO A921CY-4R7M
*1.5A IS THE MAXIMUM OUTPUT CURRENT
R
SS
1M
R
PG
100k
C
SS
0.1µF
POWER
GOOD
C
IN2
10µF
R1 523k
R2
412k
TYPICAL APPLICATIO
U
Single Li-Ion to 1.8V/1.5A Regulator Using All Ceramic Capacitors
Efficiency vs Output Current
OUPUT CURRENT (mA)
EFFICIENCY (%)
100
90
80
70
60
50
40
0.1 10 100
1875 TA02a
1 1000
V
OUT
= 1.8V
L = 4.7µH
V
IN
= 4.2V
V
IN
= 3.3V