LT1377IS8PBF LINEAR TECH, LT1377IS8PBF Datasheet
LT1377IS8PBF
Manufacturer Part Number
LT1377IS8PBF
Description
Manufacturer
LINEAR TECH
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
+
Boost Regulators
CCFL Backlight Driver
Laptop Computer Supplies
Multiple Output Flyback Supplies
Inverting Supplies
Faster Switching with Increased Efficiency
Uses Small Inductors: 4.7 H
All Surface Mount Components
Only 0.5 Square Inch of Board Space
Low Minimum Supply Voltage: 2.7V
Quiescent Current: 4mA Typ
Current Limited Power Switch: 1.5A
Regulates Positive or Negative Outputs
Shutdown Supply Current: 12 A Typ
Easy External Synchronization
8-Pin SO or PDIP Packages
OFF
C1**
22 F
ON
5V-to-12V Boost Converter
4
S/S
GND
LT1372/LT1377
6, 7
0.047 F
V
5V
IN
C2
5
U
R3
2k
4.7 H
V
V
L1*
SW
C
FB
1
8
2
MBRS120T3
C3
0.0047 F
D1
U
R2
6.19k
1%
R1
53.6k
1%
+
C4**
22 F
V
12V
OUT
†
**AVX TPSD226M025R0200
*FOR LT1372 USE 10 H
†
MAX I
COILCRAFT DO1608-472 (4.7 H) OR
COILCRAFT DT3316-103 (10 H) OR
SUMIDA CD43-4R7 (4.7 H) OR
SUMIDA CD73-100KC (10 H) OR
4.7 H
10 H
L1
OUT
I
OUT
0.25A
0.35A
(LT1377)
DESCRIPTIO
The LT
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 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
I
OUT
1.5A Switching Regulators
0.29A
LT1372 • TA01
(LT1372)
NA
®
1372/LT1377 are monolithic high frequency
100
U
90
60
50
80
70
0.01
500kHz and 1MHz
V
IN
= 5V
12V Output Efficiency
High Efficiency
OUTPUT CURRENT (A)
LT1372/LT1377
0.1
LT1372 • TA02
1
1
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