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Linear Technology Electronic Components Datasheet

LT1374 Datasheet

4.5A/ 500kHz Step-Down Switching Regulator

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FEATURES
s Constant 500kHz Switching Frequency
s Easily Synchronizable
s Uses All Surface Mount Components
s Inductor Size Reduced to 1.8µH
s Saturating Switch Design: 0.07
s Effective Supply Current: 2.5mA
s Shutdown Current: 20µA
s Cycle-by-Cycle Current Limiting
U
APPLICATIO S
s Portable Computers
s Battery-Powered Systems
s Battery Chargers
s Distributed Power
LT1374
4.5A, 500kHz Step-Down
Switching Regulator
DESCRIPTIO
The LT®1374 is a 500kHz monolithic buck mode switching
regulator. A 4.5A switch is included on the die along with
all the necessary oscillator, control and logic circuitry. High
switching frequency allows a considerable reduction in the
size of external components. The topology is current mode
for fast transient response and good loop stability. Both
fixed output voltage and adjustable parts are available.
A special high speed bipolar process and new design tech-
niques achieve high efficiency at high switching frequency.
Efficiency is maintained over a wide output current range
by using the output to bias the circuitry and by utilizing a
supply boost capacitor to saturate the power switch.
The LT1374 fits into standard 7-pin DD, TO-220 and fused
lead SO-8 packages. Full cycle-by-cycle short-circuit
protection and thermal shutdown are provided. Standard
surface mount external parts are used, including the
inductor and capacitors. There is the optional function of
shutdown or synchronization. A shutdown signal reduces
supply current to 20µA. Synchronization allows an exter-
nal logic level signal to increase the internal oscillator from
580kHz to 1MHz.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
5V Buck Converter
D2
1N914
INPUT
6V TO 25V C3* +
10µF TO
50µF
DEFAULT
= ON
C2
0.27µF
BOOST
VIN VSW
LT1374-5 BIAS
SHDN
GND
SENSE
VC
CC
1.5nF
L1**
5µH
D1 +
MBRS330T3
* RIPPLE CURRENT RATING IOUT/2
** INCREASE L1 TO 10µH FOR LOAD CURRENTS ABOVE 3.5A AND TO 20µH ABOVE 4A
SEE APPLICATIONS INFORMATION
OUTPUT**
5V, 4.25A
C1
100µF, 10V
SOLID
TANTALUM
1374 TA01
Efficiency vs Load Current
100
VOUT = 5V
VIN = 10V
95 L = 10µH
90
85
80
75
70
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
LOAD CURRENT (A)
1374 TA02
1


Linear Technology Electronic Components Datasheet

LT1374 Datasheet

4.5A/ 500kHz Step-Down Switching Regulator

No Preview Available !

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


Part Number LT1374
Description 4.5A/ 500kHz Step-Down Switching Regulator
Maker Linear Technology
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LT1374 Datasheet PDF






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