Datasheet

17
LTC1879
1879f
Figure 9a. Dual Lithium-Ion/8V Wall Adapter to 2.5V/0.7A Regulator from Design Example
APPLICATIO S I FOR ATIO
WUUU
Figure 9b. Efficiency vs Output Current for Design Example
5
12
6
11
3
1
1879 F09a
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
15µH
V
OUT
2.5V
0.7A
V
IN
2.65V TO 8.4V
GND
R1
887k
R2
412k
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-150M
V
OUT
: 0.7A IS THE MAXIMUM OUTPUT CURRENT
R
SS
1M
R
PG
100k
C
SS
0.1µF
C
IN2
10µF
OUTPUT CURRENT (mA)
70
EFFICIENCY (%)
80
100
0.1 10 100 1000
1879 F09b
60
1
90
V
IN
= 3.6V
V
OUT
= 2.5V
L = 15µH