LT1377CS8 Linear Technology, LT1377CS8 Datasheet

IC SWTCHNG REG 1.5A HI-EFF 8SOIC

LT1377CS8

Manufacturer Part Number
LT1377CS8
Description
IC SWTCHNG REG 1.5A HI-EFF 8SOIC
Manufacturer
Linear Technology
Type
Step-Down (Buck), Step-Up (Boost), Inverting, Cuk, Flyback, Forward Converterr
Datasheet

Specifications of LT1377CS8

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.25 ~ 35 V
Current - Output
1.5A
Frequency - Switching
1MHz
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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Manufacturer
Quantity
Price
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LT1377CS8
Manufacturer:
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Quantity:
20 000
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Quantity:
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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

Related parts for LT1377CS8

LT1377CS8 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 53 ...

Page 2

... C (I Grade) J LT1377 125 C J – < Grade ORDER PART NUMBER LT1372CN8 LT1372HVIN8 V SW LT1372HVCN8 LT1372IS8 GND LT1372CS8 LT1372HVIS8 GND S LT1372HVCS8 LT1377CS8 V IN LT1372IN8 LT1377IS8 S8 PART MARKING 1372 1372H 1377 1372I 1372HI 1377I = MIN TYP MAX UNITS 1.230 1.245 1.260 1.225 1.245 1.265 ...

Page 3

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

Page 4

LT1372/LT1377 W U TYPICAL PERFOR A CE CHARACTERISTICS Shutdown Delay and Threshold vs Temperature SHUTDOWN THRESHOLD SHUTDOWN DELAY –50 100 125 150 – TEMPERATURE ( ...

Page 5

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

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 Market- ing 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 Positive fixed voltage versions are available (consult Linear Technology marketing). Negative Output Voltage Setting The LT1372/LT1377 develops a – 2.49V reference (V from the NFB pin to ground. Output voltage is set by connecting the NFB pin to an output resistor divider (Figure 2). The – ...

Page 8

... IN 5. After making an initial choice, consider the secondary things like output voltage ripple, second sourcing, etc. 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 – ceramic capacitors in the near future. ...

Page 10

LT1372/LT1377 U U APPLICATIO S I FOR ATIO Frequency Compensation Loop frequency compensation is performed on the output of the error amplifier (V pin) with a series RC network. C The main pole is formed by the series capacitor and ...

Page 11

... PATENTS MAY APPLY 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. N Dual Output Flyback Converter with Overvoltage Protection R2 1 ...

Page 12

... TYP = 1.2V, Synchronizable Up to 2MHz, MSOP Package REF sn13727 13727fbs LT/TP 0401 2K REV B • PRINTED IN THE USA LINEAR TECHNOLOGY CORPORATION 1995 0.150 – 0.157** (3.810 – 3.988) 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) ...

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