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LT1370CT7 数据手册 - Linear Technology（凌力尔特）
制造商:
Linear Technology（凌力尔特）
分类:
DC/DC转换器
封装:
TO-220
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LT1370CT7数据手册
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1
LT1370
sn1370 1370fs
500kHz High Efficiency
6A Switching Regulator
The LT
®
1370 is a monolithic high frequency current mode
switching regulator. It can be operated in all standard
switching configurations including boost, buck, flyback,
forward, inverting and “Cuk.” A 6A high efficiency switch
is included on the die, along with all oscillator, control and
protection circuitry.
The LT1370 typically consumes only 4.5mA quiescent
current and has higher efficiency than previous parts.
High frequency switching allows for very small inductors
to be used.
New design techniques increase flexibility and maintain
ease of use. Switching is easily synchronized to an exter-
nal logic level source. A logic low on the Shutdown pin
reduces supply current to 12µA. Unique error amplifier
circuitry can regulate positive or negative output voltage
while maintaining simple frequency compensation tech-
niques. Nonlinear error amplifier transconductance
reduces output overshoot on start-up or overload recov-
ery. Oscillator frequency shifting protects external com-
ponents during overload conditions.
DESCRIPTION
U
■
Faster Switching with Increased Efficiency
■
Uses Small Inductors: 4.7µH
■
All Surface Mount Components
■
Low Minimum Supply Voltage: 2.7V
■
Quiescent Current: 4.5mA Typ
■
Current Limited Power Switch: 6A
■
Regulates Positive or Negative Outputs
■
Shutdown Supply Current: 12µA Typ
■
Easy External Synchronization
■
Switch Resistance: 0.065Ω Typ
TYPICAL APPLICATION
U
FEATURES
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Boost Regulators
■
Laptop Computer Supplies
■
Multiple Output Flyback Supplies
■
Inverting Supplies
APPLICATIONS
U
5V to 12V Boost Converter
LT1370
V
IN
V
C
5V
GND
FB
LT1370 • TA01
V
SW
S/S
L1*
C1**
22µF
25V
C4**
22µF
25V
× 2
C2
0.047µF
C3
0.0047µF
R3
2k
R2
6.19k
1%
R1
53.6k
1%
V
OUT
†
12V
D1
MBRD835L
ON
OFF
*
**
COILTRONICS
UP2-4R7 (4.7µH)
UP4-100 (10µH)
AVX TPSD226M025R0200
+ +
L1
4.7µH
10µH
I
OUT
1.8A
2A
†
MAX I
OUT
12V Output Efficiency
LOAD CURRENT (A)
0
80
EFFICIENCY (%)
84
82
86
88
90
1.0 1.2 1.4 1.6 1.80.2 0.4 0.6 0.8 2.0
LT1370 • TA02
92
V
IN
= 5V
L = 10µH
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