LTC1735 datasheet(1/24 Pages) LINER

부품명	LTC1735

상세설명	Wide Operating Range, No RSENSE Step-Down Controller

PDF	24 Pages

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제조업체	LINER [Linear Technology]

홈페이지	http://www.linear.com

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LTC1778/LTC1778-1

1778fb

Wide Operating Range,

No RSENSE

TM Step-Down Controller

■ No Sense Resistor Required

■ True Current Mode Control

■ Optimized for High Step-Down Ratios

■ tON(MIN) ≤ 100ns

■ Extremely Fast Transient Response

■ Stable with Ceramic COUT

■ Dual N-Channel MOSFET Synchronous Drive

■ Power Good Output Voltage Monitor (LTC1778)

■ Adjustable On-Time (LTC1778-1)

■ Wide VIN Range: 4V to 36V

■ ±1% 0.8V Voltage Reference

■ Adjustable Current Limit

■ Adjustable Switching Frequency

■ Programmable Soft-Start

■ Output Overvoltage Protection

■ Optional Short-Circuit Shutdown Timer

■ Micropower Shutdown: IQ < 30µA

■ Available in a 16-Pin Narrow SSOP Package

■

Notebook and Palmtop Computers

■ Distributed Power Systems

The LTC

®1778 is a synchronous step-down switching

regulator controller optimized for CPU power. The con-

troller uses a valley current control architecture to deliver

very low duty cycles with excellent transient response

without requiring a sense resistor. Operating frequency is

selected by an external resistor and is compensated for

variations in VIN.

Discontinuous mode operation provides high efficiency

operation at light loads. A forced continuous control pin

reduces noise and RF interference, and can assist second-

ary winding regulation by disabling discontinuous opera-

tion when the main output is lightly loaded.

Fault protection is provided by internal foldback current

limiting, an output overvoltage comparator and optional

short-circuit shutdown timer. Soft-start capability for sup-

ply sequencing is accomplished using an external timing

capacitor. The regulator current limit level is user program-

mable. Wide supply range allows operation from 4V to 36V

at the input and from 0.8V up to (0.9)VIN at the output.

Figure 1. High Efficiency Step-Down Converter

Efficiency vs Load Current

+

DB

CMDSH-3

D1

B340A

L1

1.8µH

CVCC

4.7µF

CIN

10µF

50V

×3

VIN

5V TO 28V

VOUT

2.5V

10A

+

COUT

180µF

4V

×2

M2

Si4874

1778 F01a

M1

Si4884

RON

1.4MΩ

CSS

0.1µF

ION

VIN

TG

SW

BOOST

RUN/SS

ITH

SGND

INTVCC

BG

PGND

VFB

PGOOD

CB 0.22µF

RC

20k

LTC1778

CC

500pF

R2

30.1k

R1

14k

LOAD CURRENT (A)

0.01

80

90

1778 F01b

70

60

0.1

1

10

100

VIN = 5V

VOUT = 2.5V

VIN = 25V

DESCRIPTIO

FEATURES

APPLICATIO S

TYPICAL APPLICATIO

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

No RSENSE is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Protected by U.S. Patents, including 5481178, 6100678, 6580258, 5847554, 6304066

유사한 부품 번호 - LTC1735

제조업체	부품명	데이터시트	상세설명
Linear Technology	LTC1735	373Kb / 32P	High Efficiency Synchronous Step-Down Switching Regulator
	LTC1735	312Kb / 26P	Dual, 2-Phase Step-Down Switching Controller Programmable Soft-Start
	LTC1735	374Kb / 16P	UV, OV and Reverse Supply Protection Controller Low Operating Current: 125關A
	LTC1735	205Kb / 24P	High Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency
	LTC1735	379Kb / 32P	High Efficiency Synchronous Step-Down Switching Regulator

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유사한 설명 - LTC1735

제조업체	부품명	데이터시트	상세설명
Linear Technology	LTC3778	297Kb / 24P	Wide Operating Range, No RSENSE Step-Down Controller
	LTC1778	303Kb / 24P	Wide Operating Range, No RSENSE TM Step-Down Controller REV A
	LT3740	232Kb / 20P	Wide Operating Range, Valley Mode, No RSENSE??Synchronous Step-Down Controller
	LTC3717	266Kb / 20P	Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination
	LTC3717-1	278Kb / 20P	Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination
	LTC3778	310Kb / 24P	Wide Operating Range, No RSENSE Step-Down Controller
	LTC1778	272Kb / 24P	Wide Operating Range, No RSENSE Step-Down Controller
	LTC1778-1	272Kb / 24P	Wide Operating Range, No RSENSE Step-Down Controller
	LTC3879	312Kb / 28P	Fast, Wide Operating Range No RSENSE Step-Down Controller
	LTC3878	408Kb / 26P	Fast, Wide Operating Range No RSENSE Step-Down DC/DC Controller

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LTC1735 데이터시트(PDF) 1 Page - Linear Technology

LTC1735 데이터시트(HTML) 1 Page - Linear Technology

유사한 부품 번호 - LTC1735

유사한 설명 - LTC1735

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