LT1373CS8#TR Linear Technology, LT1373CS8#TR Datasheet

IC MULTI CONFIG SYNC ADJ 8SOIC

LT1373CS8#TR

Manufacturer Part Number
LT1373CS8#TR
Description
IC MULTI CONFIG SYNC ADJ 8SOIC
Manufacturer
Linear Technology
Type
Step-Down (Buck), Step-Up (Boost), Inverting, Cuk, Flyback, Forward Converterr
Datasheet

Specifications of LT1373CS8#TR

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.25 ~ 35 V
Current - Output
1.5A
Frequency - Switching
250kHz
Voltage - Input
2.7 ~ 25 V
Operating Temperature
0°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-

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Price
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Manufacturer:
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Quantity:
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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
1mA I
Uses Small Inductors: 15 H
All Surface Mount Components
Only 0.6 Square Inch of Board Space
Low Minimum Supply Voltage: 2.7V
Constant Frequency Current Mode
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
Boost Regulators
CCFL Backlight Driver
Laptop Computer Supplies
Multiple Output Flyback Supplies
Inverting Supplies
+
OFF
C1**
22 F
Q
ON
at 250kHz
4
5V-to-12V Boost Converter
S/S
GND
6, 7
LT1373
U
5V
V
IN
5
22 H
V
V
L1*
SW
C
FB
1
R3
5k
C2
0.01 F
8
2
MBRS120T3
D1
U
LT1373 • TA01
R1
215k
1%
R2
24.9k
1%
+
**
15 H
22 H
*
C4**
22 F
MAX I
SUMIDA CD75-220KC (22 H) OR
COILCRAFT D03316-153 (15 H)
AVX TPSD226M025R0200
L1
V
12V
OUT
OUT
0.35A
I
0.3A
OUT
DESCRIPTIO
The LT
current mode switching regulator. It can be operated in all
standard switching configurations including boost, buck,
flyback, forward, inverting and “Cuk.” A 1.5A high effi-
ciency switch is included on the die, along with all oscilla-
tor, control and protection circuitry. All functions of the
LT1373 are integrated into 8-pin SO/PDIP packages.
Compared to the 500kHz LT1372, which draws 4mA of
quiescent current, the LT1373 switches at 250kHz, typi-
cally consumes only 1mA and has higher efficiency. High
frequency switching allows for small inductors to be used.
All surface mount components consume less than 0.6
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.
250kHz Low Supply Current
®
1.5A Switching Regulator
1373 is a low supply current high frequency
100
90
80
70
60
50
1
V
f = 250kHz
U
IN
= 5V
12V Output Efficiency
OUTPUT CURRENT (mA)
10
High Efficiency
100
LT1373 • TA02
LT1373
1000
1

Related parts for LT1373CS8#TR

LT1373CS8#TR Summary of contents

Page 1

... 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. † V OUT 12V R1 ...

Page 2

LT1373 ABSOLUTE AXI U RATI GS (Note 1) Supply Voltage ....................................................... 30V Switch Voltage LT1373 ............................................................... 35V LT1373HV .......................................................... 42V S/S Pin Voltage ....................................................... 30V Feedback Pin Voltage (Transient, 10ms) .............. 10V Feedback Pin Current ........................................... 10mA ...

Page 3

ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating temperature range, otherwise specifications are 5V 0.6V S/S and NFB pins open, unless otherwise noted ...

Page 4

LT1373 W U TYPICAL PERFOR A CE CHARACTERISTICS Shutdown Delay and Threshold vs Temperature SHUTDOWN THRESHOLD SHUTDOWN 8 DELAY –50 50 100 125 150 – TEMPERATURE ( ...

Page 5

CTIO S V (Pin 1): Compensation Pin. The V C frequency compensation, current limiting and soft start the output of the error amplifier and the input of the current comparator. Loop frequency compensation ...

Page 6

... FB pin to 1.245V. This architecture, which uses the same main error amplifier, prevents duplicating functions and maintains ease of use. (Consult Linear Technology Mar- keting for units that can regulate down to – 1.25V.) The error signal developed at the amplifier output is brought out externally ...

Page 7

U U APPLICATIO S I FOR ATIO Negative Output Voltage Setting The LT1373 develops a – 2.45V reference (V NFB pin to ground. Output voltage is set by connecting the NFB pin to an output resistor divider (Figure 2). The ...

Page 8

... OUT IN Use the experts in the Linear Technology application department if you feel uncertain about the final choice. They have experience with a wide range of inductor types and can tell you about the latest developments in low profile, surface mounting, etc ...

Page 9

... ESL before ESR becomes effective. They are appropriate for input bypassing because of their high ripple current ratings and tolerance of turn-on surges. Linear Technology plans to issue a Design Note on the use of ceramic capacitors in the near future. – ...

Page 10

... More Help For more detailed information on switching regulator circuits, please see AN19. Linear Technology also offers a computer software program, SwitcherCAD designing switching converters. In addition, our applica- tions department is always ready to lend a helping hand. SwitcherCAD is a trademark of Linear Technology Corporation. N ...

Page 11

... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of circuits as described herein will not infringe on existing patent rights. ...

Page 12

... R2 LT1373 L1B 2 75k GND 24. 0.01 F † MAX I OUT I V OUT IN 0.45A 4V 0.55A 5V 0.65A 7V 0.72A 9V INDUCTOR WITH TWO WINDINGS as Low as 1.5V IN sn1373 1373fbs LT/TP 0200 2K REV B • PRINTED IN THE USA LINEAR TECHNOLOGY CORPORATION 1995 † V OUT 100 F 10V LT1373 • TA07 ...

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