LT1072IN8 Linear Technology, LT1072IN8 Datasheet - Page 11

• Manufacturer Part Number: LT1072IN8
• Description: IC SWTCHNG REG 1.25A HI-EFF 8DIP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck), Step-Up (Boost), Cuk, Flyback, Forward Converterr

Specifications of LT1072IN8

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.25 ~ 40 V
• Current - Output: 1.25A
• Frequency - Switching: 40kHz
• Voltage - Input: 3 ~ 60 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

TYPICAL APPLICATIO S
1N4001
5µF
D3
C4
†
+
U
GND
Positive to Negative Buck-Boost Converter
LT1072
15V
V
V
IN
IN
Voltage Boosted Boost Converter
470Ω, 1W
V
+
C
R5
500Ω
R3
5k
V
C C 2
0.1µF
R2
R1
†
SW
FB
External Current Limit
V
GND
X
≈ 2V
0.047µF
100µF*
R2
1.24k
L1**
200µH
LT1072
D1
10.7k
V
R1
IN
C5
C2
+
V
GND
C
R3
10k
V
1N914
1/2W
SW
C C 3
2µF
FB
1.5k
D2
V
10 TO 30V
R4
LT1072
IN
D1
47Ω
0.68
D2
R2
1.24k
R4
C3
V
LT1072 • TA08
98k
C
R1
+
**PULSE ENGINEERING 92113
*REQUIRED IF INPUT LEADS ≥ 2"
†
TO AVOID START-UP PROBLEMS
FOR INPUT VOLTAGES BELOW 10V,
CONNECT ANODE OF D3 TO V
AND REMOVE R5. C1 MAY BE
REDUCED FOR LOWER OUTPUT
CURRENTS. C1 ≈ (500µF)(I
FOR 5V OUTPUTS, REDUCE R3
TO 1.5k, INCREASE C2 TO 0.3µF,
AND REDUCE R6 TO 100Ω
+
C
C1
1000µF
†
1
L1
N = 5
D1
C1
200µF
V
100V AT 75mA
OUT
TOTAL INDUCTANCE = 8mH
INTERLEAVE PRIMARY AND
SECONDARY FOR LOW LEAKAGE
INDUCTANCE
R6
470Ω
V
–12V AT 2A
OUT
LT1072 • TA07
OUT
IN
).
,
LT1072 • TA09
LT1072
11
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