Datasheet > LTC3839

LTC3839

更新时间： 2023-12-20 18:44:55

品牌	Logo	应用领域
亚德诺 - ADI		控制器
页数	文件大小	规格书
50页	922K
描述
具差分输出检测功能的快速、准确、两相、单路输出降压型 DC/DC 控制器

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LTC3839 数据手册

LTC3839

Fast, Accurate, 2-Phase,

Single-Output Step-Down DC/DC

Controller with Differential Output Sensing

DESCRIPTION

FEATURES

The LTC^®3839 is a 2-phase, single-output PolyPhase^®

synchronous step-down switching regulator controller

that drives all N-channel power MOSFETs. The controlled

on-time,valleycurrentmodecontrolarchitectureallowsfor

fast transient response and constant frequency switching

Wide V Range: 4.5V to 38V, V : 0.6V to 5.5V

OUT

0.6ꢀ7 Output Voltage Accuracy Over Temperature,

Differential Output Voltage Sensing, Allowing Up to

500mV ꢁine ꢁoss at Remote ꢂround

Controlled On-Time, Valley Current Mode Control

FastꢁoadTransientResponse

in steady-state operation, independent of V , V

and

IN OUT

DetectTransient(DTR)ReducesV

Overshoot

load current. Its load-release transient detection feature

significantly reduces overshoot at low output voltages.

OUT

Frequency Programmable from 200kHz to 2MHz,

Synchronizable to External Clock

Differential output voltage sensing, along with a preci-

sion internal reference, offers an accurate ±±.ꢀ67 output

regulation,eveniftheremoteoutputgrounddeviatesfrom

local ground by ±ꢁ±±mV.

= 30ns, t

= 90ns

ON(MIN)

OFF(MIN)

Up to 12-Phase Operation

or Inductor DCR Current Sensing

SENSE

Overvoltage Protection and Current Limit Foldback

Power Good Output Voltage Monitor

Output Voltage Tracking and Adjustable Soft Start-Up

Thermally Enhanced 32-Pin (ꢁmm × ꢁmm) QFN

Package

Theswitchingfrequencycanbeprogrammedfrom2±±kHz

to2MHzwithanexternalresistorandcanbesynchronized

to an external clock. Very low t and t times allow for

OFF

near ±7 and near 1±±7 duty cycles, respectively. Volt-

age tracking soft start-up and multiple safety features are

provided.

APPLICATIONS

L, LT, LTC, LTM, PolyPhase, OPTI-LOOP, Linear Technology and the Linear logo are

registered trademarks and Hot Swap and Stage Shedding are trademarks of Linear Technology

Corporation. All other trademarks are the property of their respective owners. Protected by U.S.

Patents, including ꢁ481168, ꢁ846ꢁꢁ4, ꢀꢁ8±2ꢁ8, ꢀ3±4±ꢀꢀ, ꢀ46ꢀꢁ89, ꢀ664ꢀ11.

Distributed Power Systems

Point-of-Load Converters

Computing Systems

Data Communication Systems

TYPICAL APPLICATION

3.3V/25A Output, 2MHz Step-Down Converter (Refer to Figure 20 for Full Design)

Efficiency/Power ꢁoss

4.5V TO 14V

–

100

SENSE1

SENSE2

INTV

= 5V

DISCONTINUOUS

MODE

TG1

TG2

LTC3839

SW1

SW2

FORCED

0.3µH

OUT

CONTINUOUS

BOOST1

BOOST2

3.3V

25A

MODE

0.1µF

45.3k

10k

DRV

CC2

DRV

CC1

100µF

×6

BG1

BG2

4.7µF

PGND

LOSS

FORCED CM

MODE/PLLIN

CLKOUT

PHASMD

RUN

LOSS

DCM

–

OUTSENSE

100

0.1

TRACK/SS

ITH

LOAD CURRENT (A)

3839 TA01b

18.7k

DTR

SGND

3839 TA01a

3839fa

12 3 4 5 6 7...50

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