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LT1370

500kHz High Efficiency

6A Switching Regulator

The LT

1370 is a monolithic high frequency current mode

switching regulator. It can be operated in all standard

switching configurations including boost, buck, flyback,

forward, inverting and “Cuk.” A 6A high efficiency switch

is included on the die, along with all oscillator, control and

protection circuitry.

The LT1370 typically consumes only 4.5mA 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 12µA. Unique error amplifier

circuitry can regulate positive or negative output voltage

while maintaining simple frequency compensation tech-

niques. Nonlinear error amplifier transconductance

reduces output overshoot on start-up or overload recov-

ery. Oscillator frequency shifting protects external com-

ponents during overload conditions.

DESCRIPTION

■

Faster Switching with Increased Efficiency

■

Uses Small Inductors: 4.7µH

■

All Surface Mount Components

■

Low Minimum Supply Voltage: 2.7V

■

Quiescent Current: 4.5mA Typ

■

Current Limited Power Switch: 6A

■

Regulates Positive or Negative Outputs

■

Shutdown Supply Current: 12µA Typ

■

Easy External Synchronization

■

Switch Resistance: 0.065Ω Typ

TYPICAL APPLICATION

FEATURES

, LTC and LT are registered trademarks of Linear Technology Corporation.

■

Boost Regulators

■

Laptop Computer Supplies

■

Multiple Output Flyback Supplies

■

Inverting Supplies

APPLICATIONS

5V to 12V Boost Converter

LT1370

GND

LT1370 • TA01

S/S

L1*



C1**

22µF

25V

C4**

22µF

25V

× 2

C2

0.047µF

C3

0.0047µF



R3

R2

6.19k

R1

53.6k

OUT

†



12V

D1

MBRD835L

OFF

*



COILTRONICS

UP2-4R7 (4.7µH)

UP4-100 (10µH)

AVX TPSD226M025R0200



+ +

L1

4.7µH

10µH

OUT



1.8A

†

MAX I

OUT

12V Output Efficiency

LOAD CURRENT (A)

EFFICIENCY (%)

1.0 1.2 1.4 1.6 1.80.2 0.4 0.6 0.8 2.0

LT1370 • TA02

= 5V

L = 10µH

LT1370

ARB

EXI T

Supply Voltage ....................................................... 30V

Switch Voltage

LT1370 ............................................................... 35V

LT1370HV .......................................................... 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

Operating Ambient Temperature Range ...... 0°C to 70°C

Operating Junction Temperature Range

Commercial .......................................... 0°C to 125°C

Industrial ......................................... –40°C to 125°C

Storage Temperature Range ................ –65°C to 150°C

Lead Temperature (Soldering, 10 sec)................. 300°C

LECTR

AL C CHARA TERIST

ICS

= 5V, V

= 0.6V, V

= V

REF

, V

, S/S and NFB pins open, T

= 25°C unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

REF

Reference Voltage Measured at Feedback Pin 1.230 1.245 1.260 V

= 0.8V ● 1.225 1.245 1.265 V

Feedback Input Current V

= V

REF

250 550 nA

● 900 nA

Reference Voltage Line Regulation 2.7V ≤ V

≤ 25V, V

= 0.8V ● 0.01 0.03 %/V

NFR

Negative Feedback Reference Voltage Measured at Negative Feedback Pin –2.525 –2.48 –2.435 V

Feedback Pin Open, V

= 0.8V ● –2.560 –2.48 – 2.400 V

NFB

Negative Feedback Input Current V

NFB

= V

NFR

● –45 –30 –15 µA

Negative Feedback Reference Voltage 2.7V ≤ V

≤ 25V, V

= 0.8V ● 0.01 0.05 %/V

Line Regulation

Error Amplifier Transconductance ∆I

= ±25µA 1100 1500 1900 µmho

● 700 2300 µmho

Error Amplifier Source Current V

= V

REF

– 150mV, V

= 1.5V ● 120 200 350 µA

Error Amplifier Sink Current V

= V

REF

+ 150mV, V

= 1.5V ● 1400 2400 µA

PACKAGE

RDER I FOR ATIO

JMAX

= 125°C, θ

= 30°C/W, θ

= 4°C/W

R PACKAGE

7-LEAD PLASTIC DD

FRONT VIEW

TAB

IS

GND



NFB



GND

S/S

FB

7

6

5

4

3

2

ORDER PART

NUMBER

WITH PACKAGE SOLDERED TO 0.5 INCH

COPPER

AREA OVER BACKSIDE GROUND PLANE OR INTERNAL

POWER PLANE. θ

CAN VARY FROM 20°C/W TO

>40°C/W DEPENDING ON MOUNTING TECHNIQUE

ORDER PART

NUMBER

T7 PACKAGE

7-LEAD TO-220



NFB



GND

S/S

FB

FRONT VIEW

7

6

5

4

3

2

TAB

IS

GND

JMAX

= 125°C, θ

= 50°C/W, θ

= 4°C/W

Consult factory for Military grade parts.

LT1370CR

LT1370HVCR

LT1370IR

LT1370HVIR

LT1370CT7

LT1370HVCT7

LT1370IT7

LT1370HVIT7

剩余16页未读，继续阅读

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