LT1374IT7 반도체 회로 부품 판매점
4.5A/ 500kHz Step-Down Switching Regulator
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 Linear Technology |
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: 0.07Ω
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
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
kΩ
%/V
2
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LT1374IT7 regulator
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관련 데이터시트
LT1374IT7
4.5A/ 500kHz Step-Down Switching Regulator - Linear Technology
LT1374IT7-5
4.5A/ 500kHz Step-Down Switching Regulator - Linear Technology