LTC1879 LINER [Linear Technology], LTC1879 Datasheet - Page 17

• Manufacturer Part Number: LTC1879
• Description: 1.2A Synchronous Step-Down Regulator with 15mA Quiescent Current
• Manufacturer: LINER [Linear Technology]

APPLICATIO S I FOR ATIO
U
Figure 9a. Dual Lithium-Ion/8V Wall Adapter to 2.5V/0.7A Regulator from Design Example
BOLD LINES INDICATE HIGH CURRENT PATHS
C
C
L1: TOKO A921CY-150M
V
C
0.1 F
C
220pF
IN1
OUT
OUT
SVIN
C2
, C
: TDK CERAMIC C4532X5R0J476M
: 0.7A IS THE MAXIMUM OUTPUT CURRENT
U
0.1 F
IN2
C
R
100k
: TAIYO YUDEN CERAMIC JMK316BJ106ML
SS
R
PG
1M
SS
R
150k
C
C
47pF
C1
Figure 9b. Efficiency vs Output Current for Design Example
14
16
W
2
4
PGOOD
RUN/SS
PLL_LPF
I
TH
SV
100
90
80
70
60
IN
13
LTC1879
0.1
V
V
L = 15 H
SYNC/MODE
IN
OUT
U
= 3.6V
= 2.5V
PGND
PGND
SGND
15
SWN
SWN
SWP
SWP
PV
PV
1
OUTPUT CURRENT (mA)
V
FB
IN
IN
R
10
SVIN
8
9
7
10
5
12
6
11
3
1
10
R2
412k
10 F
C
15 H
887k
R1
IN1
L1
100
1879 F09b
1000
C
47 F
OUT
C
10 F
IN2
1879 F09a
V
2.65V TO 8.4V
GND
V
2.5V
0.7A
IN
OUT
LTC1879
17
1879f