LT1940 Linear Technology, LT1940 Datasheet - Page 16

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

LT1940
TYPICAL APPLICATIO S
16
OUT1
1.8V
1.4A
22 F
C1
C1: TAIYO YUDEN JMK316BJ226ML
C2: TAIYO YUDEN JMK316BJ106ML
C3: TAIYO YUDEN EMK316BJ475ML
4.7V TO 14V
10.0k
2.2 H
L1
V
IN
22.6k
POWER GOOD
U
20k
C3
4.7 F
0.1 F
220pF
2V/DIV
2V/DIV
2V/DIV
2V/DIV
V
V
D1
OUT1
OUT2
V
IN
3.3V and 1.8V Outputs with Sequencing
1nF
D3
BOOST1
SW1
FB1
V
RUN/SS1
RUN/SS2
D1, D2: MICROSEMI UPS120
D3, D4: CENTRAL CMDSH-3
L1: SUMIDA CR43-2R2
L2: SUMIDA CR43-3R3
C1
LT1940
Start-Up Waveforms
GND
V
IN
BOOST2
SW2
PG1
PG2
FB2
V
50 s/DIV
C2
0.1 F
15k
330pF
D2
D4
1940 TA01b
10.0k
16.5k
3.3 H
100k
L2
1940 TA01
C2
10 F
POWER
GOOD
OUT2
3.3V
1A
(1.4A FOR V
IN
> 5V)
1940i