Datasheet

13
LTC1771
RUN/SS
I
TH
V
FB
GND
1
2
3
4
8
7
6
5
MODE
SENSE
V
IN
PGATE
LTC1771
1000pF
Si3443DV
D1
1771 TA01
L1
22µH
R
SENSE
0.1
C
IN
33µF
16V
V
IN
3.3V
TO 12V
V
OUT
2.5V
1A
+
0.01µF
5pF
220pF
10k
1.02M
1%
C
IN
: AVX TPSC336M016R0300
C
OUT
: SANYO POSCAP 6TPB150M
D1: MICROSEMI UPS5817
L1: SUMIDA CDRH6D38-220
1M
1%
C
OUT
150µF
6.3V
+
3.3V to 2.5V/1A Regulator with Burst Mode Operation Enabled
Low Dropout 5V/2A Regulator with Burst Mode Operation Disabled
RUN/SS
I
TH
V
FB
GND
1
2
3
4
8
7
6
5
MODE
SENSE
V
IN
PGATE
LTC1771
1000pF
Si6447DQ
D1
1771 TA04
L1
22µH
R
SENSE
0.05
C
IN
22µF
25V
×2
V
IN
5.5V
TO 18V
V
OUT
5V
2A
+
0.01µF
15pF
330pF
10k
3.09M
1%
1M
1%
C
OUT
150µF
6.3V
+
C
IN
: AVX TPSD226M025R0200
C
OUT
: SANYO POSCAP 6TPB150M
D1: MICROSEMI UPS5817
L1: SUMIDA CR75-220
TYPICAL APPLICATIO S
U
APPLICATIO S I FOR ATIO
WUUU
With a 0.05 sense resistor I
SC(AVG)
= 2A will result,
increasing the 0.5V Schottky diode dissipation to 1W.
C
IN
is chosen for a RMS current rating of at least 1A at
temperature. C
OUT
is chosen with an ESR of 0.05 for low
output ripple. The output voltage ripple due to ESR is
approximately:
V
ORIPPLE
(R
ESR
)(I
L
) = 0.05 (0.89A
P-P
) = 45mV
P-P