LT1940 Linear Technology, LT1940 Datasheet - Page 18

• Manufacturer Part Number: LT1940
• Description: Dual Monolithic 1.4A/ 1.1MHz Step-Down Switching Regulator
• Manufacturer: Linear Technology

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