Datasheet
14
LTC1771
Low Dropout Single Cell Lithium-Ion to 3V
RUN/SS
I
TH
V
FB
GND
1
2
3
4
8
7
6
5
MODE
SENSE
V
IN
PGATE
LTC1771
1000pF
MODE
Si3443DV
D1
1771 TA02
L1
15µH
R
SENSE
0.05Ω
C
IN
47µF
10V
Li-Ion
3.4V TO 4.2V
V
OUT
3V
2A
+
0.01µF
15pF
330pF
10k
1.43M
1%
1M
1%
C
OUT
220µF
4V
+
C
IN
: TAIYO YUDEN LMK550BJ476MM
C
OUT
: SANYO POSCAP 4TPB220M
D1: MICROSEMI UPS5817
L1: SUMIDA CR75-150
12V/1A Zeta Converter
RUN/SS
I
TH
V
FB
GND
1
2
3
4
8
7
6
5
MODE
SENSE
V
IN
PGATE
LTC1771
1000pF
MODE
Si6459DQ
D1
1771 TA05
L1B
47µH
•
•
L1A
47µH
C1
33µF
20V
×2
R
SENSE
0.025Ω
C
IN
22µF
25V
×2
V
IN
5V
TO 18V
V
OUT
12V
1A
+
+
0.01µF
5pF
220pF
V
IN
10k
Q1
3.01M
1%
280k
1%
402k
1%
8.66M
1%
1M
1%
C
OUT
100µF
20V
+
V
IN
(V)
4.5
5
10
15
18
I
LOAD(MAX)
(A)
0.7
0.9
1.8
2.4
2.6
C
IN
: AVX TPSD226M025R0200
C
OUT
: AVX TPSV107M020R0085
C1: AVX TPSD336M020R0200
D1: MOTOROLA MBRS140T3
L1A, L1B: COILTRONICS VP4-0075, B H ELECTRONICS Q10549
Q1: MOTOROLA MMBT2N2222LT1
TYPICAL APPLICATIO S
U
2.5V/1A Regulator with Foldback Current Limit
RUN/SS
I
TH
V
FB
GND
1
2
3
4
8
7
6
5
MODE
SENSE
V
IN
PGATE
LTC1771
1000pF
MODE
1771 TA06
L1
22µH
I
TH
U1
1234
8
1N4148
×2
765
R
SENSE
0.1Ω
C
IN
33µF
16V
V
IN
2.8V
TO 12V
V
OUT
2.5V
1A
+
0.01µF
5pF
220pF
10k
1.02M
1%
1M
1%
C
OUT
150µF
6.3V
+
C
IN
: AVX TPSC336M016R0300
C
OUT
: SANYO POSCAP 6TPB150M
L1: SUMIDA CDRH6D38-220
U1: INTERNATIONAL RECTIFIER
FETKY
TM
IRF7422D2