參數(shù)資料
型號: LT1372
廠商: Linear Technology Corporation
元件分類: 基準(zhǔn)電壓源/電流源
英文描述: 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C
中文描述: 射頻放大器
文件頁數(shù): 1/12頁
文件大?。?/td> 238K
代理商: LT1372
1
LT1372/LT1377
500kHz and 1MHz
High Efficiency
1.5A Switching Regulators
I
Boost Regulators
I
CCFL Backlight Driver
I
Laptop Computer Supplies
I
Multiple Output Flyback Supplies
I
Inverting Supplies
APPLICATIO
S
U
The LT
1372/LT1377 are monolithic high frequency
switching regulators. They can be operated in all standard
switching configurations including boost, buck, flyback,
forward, inverting and “Cuk.” A 1.5A high efficiency switch
is included on the die, along with all oscillator, control and
protection circuitry. All functions of the LT1372/LT1377
are integrated into 8-pin SO/PDIP packages.
The LT1372/LT1377 typically consumes only 4mA quies-
cent current and has higher efficiency than previous parts.
High frequency switching allows for very small inductors
to be used. All surface mount components consume less
than 0.5 square inch of board space.
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 12
μ
A. Unique error amplifier
circuitry can regulate positive or negative output voltage
while maintaining simple frequency compensation tech-
niques. Nonlinear error amplifier transconductance re-
duces output overshoot on start-up or overload recovery.
Oscillator frequency shifting protects external compo-
nents during overload conditions.
DESCRIPTIO
N
U
I
Faster Switching with Increased Efficiency
I
Uses Small Inductors: 4.7
μ
H
I
All Surface Mount Components
I
Only 0.5 Square Inch of Board Space
I
Low Minimum Supply Voltage: 2.7V
I
Quiescent Current: 4mA Typ
I
Current Limited Power Switch: 1.5A
I
Regulates Positive or Negative Outputs
I
Shutdown Supply Current: 12
μ
A Typ
I
Easy External Synchronization
I
8-Pin SO or PDIP Packages
FEATURES
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
N
U
5V-to-12V Boost Converter
12V Output Efficiency
OUTPUT CURRENT (A)
0.01
50
E
60
70
80
90
0.1
1
LT1372 TA02
100
V
IN
= 5V
LT1372/LT1377
V
IN
V
C
5V
1
2
8
5
4
6, 7
GND
FB
LT1372 TA01
V
SW
S/S
L1*
4.7
μ
H
C1**
22
μ
F
C4**
22
μ
F
C2
0.047
μ
F
C3
0.0047
μ
F
R3
2k
R2
6.19k
1%
R1
53.6k
1%
V
OUT
12V
D1
MBRS120T3
ON
OFF
*COILCRAFT DO1608-472 (4.7
μ
H) OR
COILCRAFT DT3316-103 (10
μ
H) OR
SUMIDA CD43-4R7 (4.7
μ
H) OR
SUMIDA CD73-100KC (10
μ
H) OR
**AVX TPSD226M025R0200
L1
4.7
μ
H
10
μ
H
0.35A
I
OUT
0.25A
MAX I
OUT
+
+
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