LT1371HV Linear Technology Corporation, LT1371HV Datasheet

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LT1371HV

Manufacturer Part Number
LT1371HV
Description
Manufacturer
Linear Technology Corporation
Datasheet

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APPLICATIONS
FEATURES
TYPICAL
+
Boost Regulators
Laptop Computer Supplies
Multiple Output Flyback Supplies
Inverting Supplies
Faster Switching with Increased Efficiency
Uses Small Inductors: 4.7 H
All Surface Mount Components
Low Minimum Supply Voltage: 2.7V
Quiescent Current: 4mA Typ
Current Limited Power Switch: 3A
Regulates Positive or Negative Outputs
Shutdown Supply Current: 12 A Typ
Easy External Synchronization
OFF
C1**
22 F
25V
ON
S/S
GND
APPLICATION
0.047 F
LT1371
V
5V
IN
U
C2
R3
2k
4.7 H
V
V
L1*
SW
C
FB
5V to 12V Boost Converter
MBRS330T3
C3
0.0047 F
D1
U
LT1371 • TA01
R2
6.19k
1%
R1
53.6k
1%
+
C4**
22 F
25V
2
V
12V
OUT
**
*
MAX I
COILCRAFT DO3316P-472 (4.7 H),
DO3316P-103 (10 H) OR
SUMIDA CD104-100MC (10 H)
AVX TPSD226M025R0200
4.7 H
10 H
L1
OUT
0.7A
0.8A
I
OUT
The LT
switching regulator. It can be operated in all standard
switching configurations including boost, buck, flyback,
forward, inverting and “Cuk.” A 3A high efficiency switch
is included on the die, along with all oscillator, control and
protection circuitry.
The LT1371 typically consumes only 4mA 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 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.
DESCRIPTION
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1371 is a monolithic high frequency current mode
3A Switching Regulator
500kHz High Efficiency
U
100
90
60
50
80
70
0.01
V
IN
= 5V
12V Output Efficiency
OUTPUT CURRENT (A)
0.1
LT1371
LT1371 • TA02
1
1

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LT1371HV 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

... LT1371 BSOLUTE Supply Voltage ....................................................... 30V Switch Voltage LT1371 ............................................................... 35V LT1371HV .......................................................... 42V S/S, SHDN, SYNC Pin Voltage ................................ 30V Feedback Pin Voltage (Transient, 10ms) .............. 10V Feedback Pin Current ........................................... 10mA Negative Feedback Pin Voltage (Transient, 10ms) ............................................. 10V U PACKAGE/ORDER I FOR ATIO FRONT VIEW S/S TAB ...

Page 3

... FB REF 150mV 1.5V FB REF C High Clamp Low Clamp 1.5V FB Duty Cycle = 0% 2.7V V 25V 125 C J – Grade) J LT1371 LT1371HV 125 C J – Grade Duty Cycle = 50% Duty Cycle = 80% (Note 1) 2.7V V 25V IN 2.7V V 25V, V 0. 125 C J – Grade) J 2.7V V 25V ...

Page 4

LT1371 W U TYPICAL PERFORMANCE CHARACTERISTICS Switch Saturation Voltage vs Switch Current 1.0 150 C 0.9 100 0.8 0.7 0.6 0.5 –55 C 0.4 0.3 0.2 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 ...

Page 5

W U TYPICAL PERFORMANCE CHARACTERISTICS V Pin Threshold and High C Clamp Voltage vs Temperature 2.4 2.2 V HIGH CLAMP 2.0 C 1.8 1.6 1.4 1.2 V THRESHOLD C 1.0 0.8 0.6 0.4 100 125 150 –50 – ...

Page 6

LT1371 W BLOCK DIAGRAM SHUTDOWN SHDN DELAY AND RESET S/S* SYNC SYNC + NFBA 100k – NFB 50k – 1.245V REF GND SENSE U OPERATION The LT1371 is a current mode switcher. This means that switch duty ...

Page 7

U U APPLICATIO S I FOR ATIO Unique error amplifier circuitry allows the LT1371 to directly regulate negative output voltages. The negative feedback amplifier’s 100k source resistor is brought out for negative output voltage sensing. The NFB pin regulates at ...

Page 8

LT1371 U U APPLICATIO S I FOR ATIO Shutdown and Synchronization The 7-pin R and T7 package devices have a dual function S/S pin which is used for both shutdown and synchroni- zation. The SW package device has both a ...

Page 9

U U APPLICATIO S I FOR ATIO saturate abruptly and other core materials fall in be- tween. The following formula assumes continuous mode operation but it errs only slightly on the high side for discontinuous mode can be ...

Page 10

LT1371 U U APPLICATIO S I FOR ATIO Output Capacitor Ripple Current (RMS (RMS – DC RIPPLE OUT V OUT = I V OUT DC = Switch Duty Cycle Input Capacitors The input capacitor of ...

Page 11

U U APPLICATIO S I FOR ATIO maximum output load current and will also be increased if poor quality (high ESR) output capacitors are used. The addition of a 0.0047 F capacitor on the V switching frequency ripple to only ...

Page 12

LT1371 U U APPLICATIO S I FOR ATIO T7 Package Layout Considerations Electrical connection to the tab package is required for proper device operation. If the tab is tied directly to the ground plane (Figure 4) no ...

Page 13

U TYPICAL APPLICATIONS Positive-to-Negative Converter with Direct Feedback V IN 2.7V TO 13V + 100 F P6KE-15A 1N4148 S/S SW OFF LT1371 MBRS330T3 NFB V GND C C2 *COILTRONICS CTX10-4 0.047 ...

Page 14

LT1371 U TYPICAL APPLICATIONS 150 MUR405 15V 2 150 MUR405 12V TO 25V + LT1371 ...

Page 15

... DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD 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 its circuits as described herein will not infringe on existing patent rights. ...

Page 16

... TYP 0.095 – 0.115 (2.413 – 2.921) 0.013 – 0.023 (0.330 – 0.584) 0.155 – 0.195 (3.937 – 4.953) T7 (TO-220) (FORMED) 0695 = 40V IN LT/GP 0996 5K REV A • PRINTED IN THE USA LINEAR TECHNOLOGY CORPORATION 1995 ...

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