LT1171CT Linear Technology, LT1171CT Datasheet - Page 13

• Manufacturer Part Number: LT1171CT
• Description: IC SW-REG HI-EFF 2.5A TO220-5
• Manufacturer: Linear Technology
• Type: Step-Down (Buck), Step-Up (Boost), Inverting, Cuk, Flyback, Forward Converterr

Specifications of LT1171CT

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.25 ~ 40 V
• Current - Output: 2.5A
• Frequency - Switching: 100kHz
• Voltage - Input: 3 ~ 40 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Through Hole
• Package / Case: TO-220-5 (Bent and Staggered Leads)
• Power - Output: 100W
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

TYPICAL APPLICATIONS
INPUT FILTER
**
OPTIONAL
*
†
REQUIRED IF INPUT LEADS ≥ 2"
PULSE ENGINEERING 92114, COILTRONICS 50-2-52
THIS CIRCUIT IS OFTEN USED TO CONVERT –48V TO 5V. TO GUARANTEE
FULL SHORT-CIRCUIT PROTECTION, THE CURRENT LIMIT CIRCUIT SHOWN
IN AN19, FIGURE 39, SHOULD BE ADDED WITH C1 REDUCED TO 200pF.
–20V
**
*
Negative-to-Positive Buck-Boost Converter
L3
V
IN
REQUIRED IF INPUT LEADS ≥ 2"
PULSE ENGINEERING 92114
COILTRONICS 50-2-52
100μF
C4*
+
INPUT FILTER
OPTIONAL
GND
L3
LT1170
–20V
V
V
IN
IN
100μF
V
C3*
C
L1**
50μH
R3
2.2k
V
SW
C1
0.22μF
FB
+
(Note that maximum output currents are divided by 2 for LT1171, by 4 for LT1172.)
R2
1.24k
†
D1
GND
Negative Buck Converter
OPTIONAL
+
OUTPUT
LT1170
FILTER
V
IN
L2
C2
1000μF
V
C
V
R3
Q1
SW
FB
C1
C3
1170/1/2 TA07
R1
11.3k
V
12V
2A
R2
1.24k
OUT
D1
L1**
50μH
LT1170/LT1171/LT1172
+
C2
1000μF
NOTE THAT THE LT1170
GND PIN IS NO LONGER
COMMON TO V
–
+
2N3906
Q1
V
IN
Q1
External Current Limit
R1
4.64k
IN
12k
R4
C1
1000pF
–
OPTIONAL
R1
.
1k
R
OUTPUT
FILTER
S
LOAD
GND
LT1170
V
–5.2V
4.5A
1170/1/2 TA09
IN
+
V
C4
200μF
C
R2
V
C2
SW
FB
1170/1/2 TA08
13
117012fg