LT1940/LT1940L
U
TYPICAL APPLICATIO S
3.3V, ±5V
OUT3
–5V
300mA
D5
D3B
V
IN
10V TO 25V
C4
47k
10µF
V
C3
4.7µF
D3A
IN
BOOST1 BOOST2
LT1940
L2
L1
3.3µH
0.1µF
0.1µF
1µF
4.7µH
OUT1
3.3V
1.4A
OUT2
5V
600mA
SW1
SW2
D1
D2
16.5k
30.1k
FB1
FB2
V
V
C2
C1
C1
10µF
C2
10µF
15k
330pF
20k
220pF
10.0k
PG1
PG2
10.0k
RUN/SS1 RUN/SS2
GND
100k
1nF
2.2nF
1940 TA05
PGOOD
–5V LOAD SHOULD BE
LESS THAN 1/2 5V LOAD
(SEE DESIGN NOTE 100).
D5: ON SEMI MBR0530
L1: SUMIDA CR43-3R3
L2: COILTRONICS CTX5-1A
C1, C2, C4: TAIYO YUDEN JMK316BJ106ML
C3: TAIYO YUDEN TMK325BJ475ML
D1, D2: MICROSEMI UPS140 OR ON SEMI MBRM140
D3: BAT-54A
Low Ripple, Low Profile 12V to 3.3V/2.4A
Maximum Height = 2.1mm
V
IN
6V TO 16V
V
D3A
C3
4.7µF
IN
BOOST1
SW1
RUN/SS1
RUN/SS2
PG1
1nF
0.1µF
L1
4.1µH
OUT2
3.3V
2.4A
100k
D1
PG2
PGOOD
LT1940
V
C1
V
C2
D3B
6.8k
680pF
BOOST2
0.1µF
FB1
FB2
L2
4.1µH
330pF
16.5k
SW2
GND
D2
C1
22µF
10.0k
1940 TA06
D1, D2: MICROSEMI UPS120
D3: BAT-54A
L1, L2: SUMIDA CDRH5D18-4R1
C1: TAIYO YUDEN JMK316BJ226ML
C3: TAIYO YUDEN EMK325BJ475MN
1940fa
18
Linear [ Linear ]
