LTC1877 Linear Technology, LTC1877 Datasheet - Page 14

• Manufacturer Part Number: LTC1877
• Description: High Efficiency Monolithic Synchronous Step-Down Regulator
• Manufacturer: Linear Technology

LTC1877
14
APPLICATIONS
TYPICAL APPLICATIONS
220pF
***SANYO POSCAP 6TPA47M
**TAIYO YUDEN CERAMIC LMK325BJ106MN
*SUMIDA CD54-150
412k
U
1
2
3
4
RUN
I
V
GND
TH
FB
INFORMATION
LTC1877
U
SYNC/MODE
Figure 8. Single Lithium-Ion to 2.5V/0.3A Regulator from Design Example
PLL LPF
***TAIYO YUDEN CERAMIC JMK325BJ226MM
***TAIYO YUDEN CERAMIC JMK325BJ226MM
**TAIYO YUDEN CERAMIC LMK325BJ106MN
887k
**TAIYO YUDEN CERAMIC LMK325BJ106MN
SW
20pF
V
*SUMIDA CD54-150
*TOKO D62CB A920CY-100M
IN
U
220pF
W
8
7
6
5
220pF
15 H*
4-to 6-Cell NiCd/NiMH to 1.8V/0.6A Regulator
1
2
3
4
10 F**
1
2
3
4
CER
Dual Lithium-Ion to 2.5V/0.6A Regulator
RUN
I
V
GND
TH
RUN
I
V
GND
FB
TH
FB
LTC1877
LTC1877
SYNC/MODE
Using All Ceramic Capacitors
Using All Ceramic Capacitors
SYNC/MODE
U
+
PLL LPF
PLL LPF
47
1877 F08a
SW
V
V
2.7V
TO 4.2V
V
2.5V
SW
V
IN
IN
OUT
IN
F***
8
7
6
5
8
7
6
5
15 H*
10 H*
C
10 F
CER
20pF
C
10 F
CER
20pF
IN
IN
**
**
95
90
85
80
75
70
65
60
55
50
0.1
887k
412k
887k
698k
V
IN
V
IN
= 3.0V
= 4.2V
1.0
OUTPUT CURRENT (mA)
C
22 F
CER
C
22 F
CER
OUT
V
V
2.5V/0.6A
V
V
1.8V/0.6A
OUT
IN
OUT
IN
8.4V
OUT
9V
***
1877 TA04
***
1877 TA03
10
V
100
V
L = 15 H
IN
OUT
= 3.6V
= 2.5V
1877 • F08b
1000