LT1940EFE#TR Linear Technology, LT1940EFE#TR Datasheet - Page 17

• Manufacturer Part Number: LT1940EFE#TR
• Description: IC REG SW DUAL 1.4A STDN 16TSSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LT1940EFE#TR

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 2
• Voltage - Output: 1.25 ~ 22 V
• Current - Output: 1.4A
• Frequency - Switching: 1.1MHz
• Voltage - Input: 3.6 ~ 25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

TYPICAL APPLICATIO S
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
GOOD
OUT1
100 F
3.3V
1.2A
3V3
6.3V
C1
20k
+
3.3V and 1.8V Outputs with Sequencing
C3
4.7 F
0.1 F
220pF
C1: AVX TPSC107M010R0150
C2: AVX TPSC476M010R0350
C3: TAIYO YUDEN TMK325BJ475ML
D1
100k
1nF
7V TO 25V
D3
16.5k
10.0k
3.3 H
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
D3
L1
V
IN
220pF
LT1940
10.0k
GND
U
V
IN
BOOST2
SW2
C3
4.7 F
PG1
PG2
FB2
V
0.1 F
D1
C2
5V/3.3V with Tantalum Output Capacitors
D1, D2: MICROSEMI UPS140 OR ON SEMI MBRM140
D3, D4: CENTRAL CMDSH-3
L1: SUMIDA CDRH4D28-3R3
L2: SUMIDA CDRH4D28-4R7
1nF
0.1 F
BOOST1
SW1
FB1
V
PG1
RUN/SS1
C1
15k
LT1940
GND
330pF
D2
V
D4
IN
RUN/SS2
BOOST2
SW2
PG2
FB2
V
10.0k
16.5k
C2
3.3 H
100k
L2
1nF
1940 TA01
0.1 F
C2
10 F
POWER
GOOD
OUT2
3.3V
1A
(1.4A FOR V
20k
100pF
D2
IN
> 5V)
POWER GOOD
10.0k
30.1k
4.7 H
100k
D4
L2
2V/DIV
2V/DIV
2V/DIV
2V/DIV
V
V
OUT1
OUT2
V
1940 TA03
IN
+
LT1940/LT1940L
C2
47 F
10V
5 GOOD
OUT2
5V
1.2A
Start-Up Waveforms
50 s/DIV
17
1940fa
1940 TA01b