LTC3703-5 Просмотр технического описания (PDF) - Linear Technology

Номер в каталоге

Компоненты Описание

производитель

LTC3703-5

60V Synchronous Switching Regulator Controller

Linear Technology 

LTC3703-5

60V Synchronous

Switching Regulator Controller

FEATURES

s High Voltage Operation: Up to 60V

s Large 1Ω Gate Drivers (with 5V Supply)

s No Current Sense Resistor Required

s Step-Up or Step-Down DC/DC Converter

s Dual N-Channel MOSFET Synchronous Drive

s Excellent Transient Response and DC Line Regulation

s Programmable Constant Frequency: 100kHz to

600kHz

s ±1% Reference Accuracy

s Synchronizable up to 600kHz

s Selectable Pulse Skip Mode Operation

s Low Shutdown Current: 25µA Typ

s Programmable Current Limit

s Undervoltage Lockout

s Programmable Soft-Start

s 16-Pin Narrow SSOP and 28-Pin SSOP Packages

U

APPLICATIO S

s 48V Telecom and Base Station Power Supplies

s Networking Equipment, Servers

s Automotive and Industrial Control

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

*U.S. Patent Numbers: 5408150, 5055767, 6677210, 5847554, 5481178, 6304066, 6580258;

Others Pending.

DESCRIPTIO

The LTC®3703-5 is a synchronous step-down switching

regulator controller that can directly step-down voltages

from up to 60V, making it ideal for telecom and automotive

applications. The LTC3703-5 drives external logic level

N-channel MOSFETs using a constant frequency (up to

600kHz), voltage mode architecture.

A precise internal reference provides 1% DC accuracy. A

high bandwidth error amplifier and patented* line feed

forward compensation provide very fast line and load

transient response. Strong 1Ω gate drivers allow the

LTC3703-5 to drive multiple MOSFETs for higher current

applications. The operating frequency is user program-

mable from 100kHz to 600kHz and can also be synchro-

nized to an external clock for noise-sensitive applications.

Current limit is programmable with an external resistor

and utilizes the voltage drop across the synchronous

MOSFET to eliminate the need for a current sense resistor.

For applications requiring up to 100V operation, refer to

the LTC3703 data sheet.

PARAMETER

Maximum VIN

MOSFET Gate Drive

VCC UV+

VCC UV–

LTC3703-5

60V

4.5V to 15V

3.7V

3.1V

LTC3703

100V

9.3V to 15V

8.7V

6.2V

TYPICAL APPLICATIO

High Efficiency High Voltage Step-Down Converter

VCC

5V

1000pF

30k

10k

470pF

21.5k

12k

1%

100Ω

113k

1%

2200pF

0.1µF

MODE/SYNC VIN

FSET BOOST

COMP

TG

LTC3703-5

FB

SW

IMAX

VCC

INV

DRVCC

RUN/SS

BG

GND BGRTN

+

22µF

MMDL770T1

VIN

6V TO 60V

+

Si7850DP

22µF

×2

0.1µF

8µH

10Ω

10µF

1µF

Si7850DP

270µF +

16V

D1

MBR1100

VOUT

5V

5A

37035 TA04

Efficiency vs Load Current

100

VIN = 12V

95

VIN = 24V

VIN = 42V

90

85

80

0

1

2

3

4

5

LOAD CURRENT (A)

37053 TA04b

37035f

1

Share Link: