Datasheet

14
LTC1878
APPLICATIO S I FOR ATIO
WUUU
Figure 8. Single Lithium-Ion to 2.5V/0.3A Regulator from Design Example
V
OUT
2.5V
*
**
***
220pF
22µF**
CER
15µH*
887k
47µF***
412k
LTC1878
RUN
I
TH
V
FB
GND
8
7
6
5
1
2
3
4
PLL LPF
SYNC/MODE
V
IN
SW
V
IN
2.65V
TO 4.2V
SUMIDA CD54-150
TAIYO-YUDEN CERAMIC JMK325BJ226MM
SANYO POSCAP 6TPA47M
1878 F08a
+
20pF
OUTPUT CURRENT (mA)
75
EFFICIENCY (%)
80
85
90
95
0.1 10 100 1000
70
1
V
OUT
= 2.5V
L = 15µH
V
IN
= 3V
V
IN
= 4.2V
V
IN
= 3.6V
1878 F08b
TYPICAL APPLICATIO S
U
V
OUT
2.5V
0.6A
C
IN
**
22µF
CER
20pF
887k
C
OUT
**
22µF
CER
*
**
220pF
10µH*
LTC1878
RUN
I
TH
V
FB
GND
8
7
6
5
1
2
3
4
PLL LPF
SYNC/MODE
V
IN
SW
V
IN
3V TO 4.2V
TOKO D62CB A920CY-100M
TAIYO-YUDEN CERAMIC JMK325BJ226MM
1878 TA03
412k
V
OUT
1.8V
0.5A
C
IN
**
22µF
CER
20pF
887k
C
OUT
**
22µF
CER
*
**
220pF
10µH*
LTC1878
RUN
I
TH
V
FB
GND
8
7
6
5
1
2
3
4
PLL LPF
SYNC/MODE
V
IN
SW
V
IN
2.7V TO 6V
TOKO D62CB A920CY-100M
TAIYO-YUDEN CERAMIC JMK325BJ226MM
1878 TA04
698k
Single Li-Ion to 2.5V/0.6A Regulator
Using All Ceramic Capacitors
3- to 4-Cell NiCd/NiMH to 1.8V/0.5A Regulator
Using All Ceramic Capacitors