LT1374C Linear Technology, LT1374C Datasheet - Page 2

• Manufacturer Part Number: LT1374C
• Description: 4.5A/ 500kHz Step-Down Switching Regulator
• Manufacturer: Linear Technology

PACKAGE/ORDER
LT1374
Input Voltage
BOOST Pin Voltage ................................................. 38V
BOOST Pin Above Input Voltage ............................. 15V
SHDN Pin Voltage ..................................................... 7V
BIAS Pin Voltage ...................................................... 7V
FB Pin Voltage (Adjustable Part) ............................ 3.5V
ABSOLUTE
*Default is the adjustable output voltage device with FB pin and shutdown function. Option -5 replaces FB with SENSE pin for fixed 5V output applications.
-SYNC replaces SHDN with SYNC pin for applications requiring synchronization. Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
PARAMETER
Feedback Voltage (Adjustable)
Sense Voltage (Fixed 5V)
SENSE Pin Resistance
Reference Voltage Line Regulation
ture range, otherwise specifications are at T
2
T
WITH PACKAGE SOLDERED TO 0.5 SQUARE INCH
COPPER AREA OVER BACKSIDE GROUND PLANE
OR INTERNAL POWER PLANE.
FROM 20 C/W TO > 40 C/W DEPENDING ON
MOUNTING TECHNIQUES
GND
TAB
JMAX
LT1374 ............................................................... 25V
LT1374HV .......................................................... 32V
IS
ORDER PART NUMBER
= 125 C,
LT1374CR
LT1374CR-5
LT1374CR-SYNC
LT1374CR-5 SYNC
LT1374HVCR
LT1374IR
LT1374IR-5
LT1374IR-SYNC
LT1374IR-5 SYNC
LT1374HVIR
7-LEAD PLASTIC DD
FRONT VIEW
R PACKAGE
JA
= 30 C/ W
7
6
5
4
3
2
1
W
MAXIMUM
JA
FB OR SENSE*
BOOST
V
GND
V
SYNC OR SHDN*
V
CAN VARY
IN
SW
C
W W
INFORMATION
U
GND
TAB
IS
CONDITIONS
All Conditions
All Conditions
5V V
RATINGS
J
T
= 25 C. V
IN
JMAX
W
ORDER PART NUMBER
= 125 C
25V (5V V
U
7-LEAD PLASTIC TO-220
LT1374CT7
LT1374CT7-5
LT1374IT7
LT1374IT7-5
FRONT VIEW
T7 PACKAGE
IN
JA
= 15V, V
The
7
6
5
4
3
2
1
= 50 C/ W,
U
(Note 1)
IN
denotes specifications which apply over the full operating tempera-
32V for LT1374HV)
C
= 1.5V, Boost = V
JC
FB Pin Current (Adjustable Part) ............................ 1mA
SENSE Voltage (Fixed 5V Part) ................................. 7V
SYNC Pin Voltage ..................................................... 7V
Operating Junction Temperature Range
Storage Temperature Range ................ – 65 C to 150 C
Lead Temperature (Soldering, 10 sec)................. 300 C
= 4 C/ W
LT1374C ............................................... 0 C to 125 C
LT1374I ........................................... – 40 C to 125 C
FB OR SENSE*
BOOST
V
GND
V
SHDN
V
IN
SW
C
IN
LT1374CS8
LT1374CS8-5
LT1374CS8-SYNC
LT1374CS8-5 SYNC
LT1374HVCS8
+ 5V, switch open, unless otherwise noted.
CONNECTED TO GROUND PLANE OR LARGE LANDS
JA
SENSE*
= 80 C/ W WITH FUSED (FGND) GROUND PIN
BOOST
FB OR
1374
13745
1374SN
3745SN
1374HV
FGND
ORDER PART NUMBER
V
IN
S8 PART MARKING
1
2
3
4
8-LEAD PLASTIC SO
2.39
2.36
4.94
4.90
MIN
S8 PACKAGE
7
TOP VIEW
LT1374IS8
LT1374IS8-5
LT1374IS8-SYNC
LT1374IS8-5 SYNC
LT1374HVIS8
2.42
0.01
TYP
5.0
10
1374I
1374I5
374ISN
74I5SN
1374HVI
8
7
6
5
MAX
2.45
2.48
5.06
5.10
0.03
V
SYNC
OR SHDN*
V
BIAS
14
SW
C
UNITS
%/V
k
V
V
V
V