Datasheet
2
LT1371
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
Supply Voltage ....................................................... 30V
Switch Voltage
LT1371 ............................................................... 35V
LT1371HV .......................................................... 42V
S/S, SHDN, SYNC Pin Voltage ................................ 30V
Feedback Pin Voltage (Transient, 10ms) .............. ±10V
Feedback Pin Current........................................... 10mA
Negative Feedback Pin Voltage
(Transient, 10ms)............................................. ±10V
Operating Ambient Temperature Range ...... 0°C to 70°C
Operating Junction Temperature Range
Commercial .......................................... 0°C to 125°C
Industrial ......................................... –40°C to 125°C
Short Circuit ......................................... 0°C to 150°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
E
LECTR
IC
AL C CHARA TERIST
ICS
V
IN
= 5V, V
C
= 0.6V, V
FB
= V
REF
, V
SW
, S/S, SHDN, SYNC and NFB pins open, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
REF
Reference Voltage Measured at Feedback Pin 1.230 1.245 1.260 V
V
C
= 0.8V ● 1.225 1.245 1.265 V
I
FB
Feedback Input Current V
FB
= V
REF
250 550 nA
● 900 nA
Reference Voltage Line Regulation 2.7V ≤ V
IN
≤ 25V, V
C
= 0.8V ● 0.01 0.03 %/V
WU
U
PACKAGE
/
O
RDER I FOR ATIO
T
JMAX
= 125°C, θ
JA
= 30°C/W
R PACKAGE
7-LEAD PLASTIC DD
FRONT VIEW
TAB
IS
GND
V
IN
S/S
V
SW
GND
NFB
FB
V
C
7
6
5
4
3
2
1
ORDER PART
NUMBER
WITH PACKAGE SOLDERED TO 0.5 INCH
2
COPPER
AREA OVER BACKSIDE GROUND PLANE OR INTERNAL
POWER PLANE. θ
JA
CAN VARY FROM 20°C/W TO
>40°C/W DEPENDING ON MOUNTING TECHNIQUE
ORDER PART
NUMBER
T7 PACKAGE
7-LEAD TO-220
V
IN
S/S
V
SW
GND
NFB
FB
V
C
FRONT VIEW
7
6
5
4
3
2
1
TAB
IS
GND
T
JMAX
= 125°C, θ
JA
= 50°C/W, θ
JC
= 4°C/W
ORDER PART
NUMBER
T
JMAX
= 125°C, θ
JA
= 50°C/W
θ
JA
WILL VARY FROM APPROXIMATELY 40°C/W WITH
0.75 INCH
2
OF 1 OZ COPPER TO 50°C/W WITH 0.33 INCH
2
OF 1 OZ COPPER ON A DOUBLE-SIDED BOARD
1
2
3
4
5
6
7
8
9
10
TOP VIEW
SW PACKAGE
20-LEAD PLASTIC SO WIDE
20
19
18
17
16
15
14
13
12
11
V
C
FB
NFB
GND
GND
GND
GND
SHDN
SYNC
V
IN
V
SW
NC
V
SW
GND
GND
GND
GND
NC
NC
GND
LT1371CR
LT1371HVCR
LT1371IR
LT1371HVIR
LT1371CT7
LT1371HVCT7
LT1371IT7
LT1371HVIT7
LT1371CSW
LT1371HVCSW
LT1371ISW
LT1371HVISW
Consult factory for Military grade parts.