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參數資料
| 型號： | 1374I |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關穩壓器 |
| 文件頁數： | 1/32頁 |
| 文件大小： | 309K |
| 代理商： | 1374I |
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1
LT1374
1374fb
4.5A, 500kHz Step-Down
Switching Regulator
I
Constant 500kHz Switching Frequency
I
High Power 16-Pin TSSOP Package Available
I
Uses All Surface Mount Components
I
Inductor Size Reduced to 1.8
μ
H
I
Saturating Switch Design: 0.07
I
Effective Supply Current: 2.5mA
I
Shutdown Current: 20
μ
A
I
Cycle-by-Cycle Current Limiting
I
Easily Synchronizable
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 is available in standard 7-pin DD, TO-220, fused
lead SO-8 and 16-pin exposed pad TSSOP packages. Full
cycle-by-cycle short-circuit protection and thermal shut-
down are provided. Standard surface mount external parts
may be used, including the inductor and capacitors. There
is the optional function of shutdown or synchronization. A
shutdown signal reduces supply current to 20
μ
A. Synchro-
nization allows an external logic level signal to increase the
internal oscillator from 580kHz to 1MHz.
, LTC and LT are registered trademarks of Linear Technology Corporation.
5V Buck Converter
LOAD CURRENT (A)
0
E
100
95
90
85
80
75
70
2.0
2.5
3.0
3.5
1374 TA02
0.5
1.0
1.5
4.0
V
OUT
= 5V
V
= 10V
L = 10
μ
H
Efficiency vs Load Current
BOOST
LT1374-5
V
IN
SHDN
OUTPUT**
5V, 4.25A
* RIPPLE CURRENT RATING
≥
I
/2
** INCREASE L1 TO 10
μ
H FOR LOAD CURRENTS ABOVE 3.5A AND TO 20
μ
H ABOVE 4A
SEE APPLICATIONS INFORMATION
INPUT
6V TO 25V
1374 TA01
C2
0.27
μ
F
C
1.5nF
D1
MBRS330T3
C1
100
μ
F, 10V
SOLID
TANTALUM
C3*
10
μ
F TO
50
μ
F
DEFAULT
= ON
D2
CMDSH3 OR FMMD914
L1**
5
μ
H
V
SW
SENSE
V
C
BIAS
GND
+
+
I
Portable Computers
I
Battery-Powered Systems
I
Battery Chargers
I
Distributed Power
FEATURES
DESCRIPTIOU
APPLICATIU
TYPICAL APPLICATIO
U
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|---|---|
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