Datasheet > LTC3568

LTC3568

更新时间： 2023-12-20 18:46:08

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
18页	305K
描述
1.8A、4MHz、同步降压型 DC/DC 转换器

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LTC3568 数据手册

LTC3568

1.8A, 4MHz, Synchronous

Step-Down DC/DC Converter

FeaTures

DescripTion

The LTC^®3568 is a constant frequency, synchronous

step- down DC/DC converter. Intended for medium power

applications, it operates from a 2.5V to 5.5V input voltage

range and has a user configurable operating frequency

up to 4MHz, allowing the use of tiny, low cost capacitors

and inductors 2mm or less in height. The output voltage

is adjustable from 0.8V to 5V. Internal sychronous 0.11Ω

power switches with 2.4A peak current ratings provide

high efficiency. The LTC3568’s current mode architecture

and external compensation allow the transient response

to be optimized over a wide range of loads and output

capacitors.

ꢀ UsesꢀTinyꢀCapacitorsꢀandꢀInductor

ꢀ HighꢀFrequencyꢀOperation:ꢀUpꢀtoꢀ4MHz

ꢀ LowꢀR

ꢀInternalꢀSwitches:ꢀ0.110Ω

DS(ON)

High Efficiency: Up to 96%

Stable with Ceramic Capacitors

Current Mode Operation for Excellent Line

and Load Transient Response

Short-Circuit Protected

Low Dropout Operation: 100% Duty Cycle

Low Shutdown Current: I ≤ 1µA

Low Quiescent Current: 60µA

Output Voltages from 0.8V to 5V

Selectable Burst Mode^®Operation

Sychronizable to External Clock

Small 3mm × 3mm, 10-Lead DFN Package

The LTC3568 can be configured for automatic power sav-

ing Burst Mode operation to reduce gate charge losses

when the load current drops below the level required for

continuous operation. For reduced noise and RF interfer-

ence,theSYNC/MODEpincanbeconfiguredtoskippulses

or provide forced continuous operation.

applicaTions

Notebook Computers

Digital Cameras

To further maximize battery life, the P-channel MOSFET

is turned on continuously in dropout (100% duty cycle)

with a low quiescent current of 60µA. In shutdown, the

device draws <1µA.

Cellular Phones

Handheld Instruments

Board Mounted Power Supplies

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

registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other

trademarks are the property of their respective owners. Protected by U.S. Patents including

5481178, 6580258, 6304066, 6127815, 6611131.

Typical applicaTion

EfficiencyꢀvsꢀLoadꢀCurrent

2.5V TO 5.5V

100

1000

100

22µF

EFFICIENCY

SYNC/MODE

PGOOD

2µH

OUT

2.5V/1.8A

LTC3568

22µF + 10µF

POWER LOSS

887k

SHDN/R

13k

1000pF

= 3.3V

= 2.5V

= 1MHz

SGND

PGND

OUT

324k

412k

Burst Mode

OPERATION

NOTE: IN DROPOUT, THE OUTPUT TRACKS

THE INPUT VOLTAGE

3568 F01

100

1000

10000

LOAD CURRENT (mA)

3568 TA01

Figureꢀ1.ꢀStep-Downꢀ1.8AꢀRegulator

3568fa

ꢀ

12 3 4 5 6 7...18

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