Datasheet > LT3433

LT3433

更新时间： 2023-12-20 18:46:14

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
16页	238K
描述
高电压、升压 / 降压型 DC/DC 转换器

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LT3433 数据手册

LT3433

High Voltage

Step-Up/Step-Down

DC/DC Converter

FEATURES

DESCRIPTIO

The LT^®3433 is a 200kHz fixed-frequency current mode

switching regulator that provides both step-up and step-

down regulation using a single inductor. The IC operates

over a 4V to 60V input voltage range making it suitable for

use in various wide input voltage range applications such

as automotive electronics that must withstand both load

dump and cold crank conditions.

■

Automatic Step-Up and Step-Down Conversion

■

Uses a Single Inductor

■

Wide 4V to 60V Input Voltage Range

■

V_OUTfrom 3.3V to 20V

■

Dual Internal 500mA Switches

■

100µA No-Load Quiescent Current

■

Low Current Shutdown

■

±1% Output Voltage Accuracy

Internal control circuitry monitors system conditions and

converts from single switch buck operation to dual switch

bridged operation when required, seamlessly changing

between step-down and step-up voltage conversion.

Optional Burst Mode^®operation reduces no-load quies-

cent current to 100µA and maintains high efficiencies with

light loads.

■

200kHz Operating Frequency

■

Boosted Supply Pin to Saturate High Side Switch

■

Frequency Foldback Protection

Current Limit Foldback Protection

■

Current Limit Unaffected by Duty Cycle

16-lead Thermally Enhanced TSSOP Package

■

APPLICATIO S

Current limit foldback and frequency foldback help pre-

vent inductor current runaway during start-up. Program-

mablesoft-starthelpspreventoutputovershootatstart-up.

■

12V Automotive Systems

■

Wall Adapter Powered Systems

■

Battery Power Voltage Buffering

The LT3433 is available in a 16-lead thermally enhanced

TSSOP package.

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

Burst Mode is a registered trademark of Linear Technology Corporation.

U.S. patent number: 5731694

TYPICAL APPLICATIO

Maximum Output

Current vs V_IN

4V to 60V to 5V DC/DC Converter

with Burst Mode Operation

Efficiency

1N4148

500

400

300

200

= 5V

OUT

BST

2.2µF

0.01µF

0.1µF

BUCK

V = 13.8V

SHDN

SWH

LT3433

B160A

100µH

330pF

1nF

B120A

SWL

OUT

= 4V

68k

OUT

47µF

1N4148

BRIDGED

BIAS

0.1µF

309k

100k

100

BURST_EN

SGND PGND

0.1

100

1000

(V)

OUTPUT CURRENT (mA)

3433 TA01

3433 TA01b

3433 TA01c

3433f

12 3 4 5 6 7...16

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