Datasheet > LT3481

LT3481

更新时间： 2024-09-26 14:57:55

品牌	Logo	应用领域
亚德诺 - ADI		开关稳压器
页数	文件大小	规格书
24页	308K
描述
具有 50μA 静态电流的 36V、2A、2.8MHz 降压型开关稳压器

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中文翻译

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LT3481 数据手册

LT3481

36V, 2A, 2.8MHz Step-Down

Switching Regulator with

50µA Quiescent Current

FEATURES

DESCRIPTION

TheLT^®3481isanadjustablefrequency(300kHzto2.8MHz)

monolithic buck switching regulator that accepts input

voltages up to 34V (36V maximum). A high efﬁciency

0.18Ω switch is included on the die along with a boost

Schottky diode and the necessary oscillator, control, and

logic circuitry. Current mode topology is used for fast

transient response and good loop stability. Low ripple

Burst Mode operation maintains high efﬁciency at low

output currents while keeping output ripple below 15mV

in a typical application. In addition, the LT3481 can fur-

ther enhance low output current efﬁciency by drawing

■

Wide Input Range: 3.6V to 34V Operating,

36V Maximum

■

2A Maximum Output Current

Low Ripple Burst Mode^®Operation

■

50μA I at 12V to 3.3V

OUT

Output Ripple < 15mV

■

Adjustable Switching Frequency: 300kHz to 2.8MHz

Low Shutdown Current: I < 1μA

Integrated Boost Diode

Power Good Flag

Saturating Switch Design: 0.18Ω On-Resistance

1.265V Feedback Reference Voltage

Output Voltage: 1.265V to 20V

Soft-Start Capability

Synchronizable Between 275kHz to 475kHz

Small 10-Pin Thermally Enhanced MSOP and

(3mm x 3mm) DFN Packages

bias current from the output when V

is above 3V.

OUT

Shutdown reduces input supply current to less than 1μA

while a resistor and capacitor on the RUN/SS pin provide a

controlled output voltage ramp (soft-start). A power good

ﬂag signals when V

reaches 90% of the programmed

OUT

output voltage. The LT3481 is available in 10-Pin MSOP

and 3mm x 3mm DFN packages with exposed pads for

low thermal resistance.

APPLICATIONS

L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered

trademarks of Linear Technology Corporation. All other trademarks are the property of their

respective owners.

■

Automotive Battery Regulation

■

Power for Portable Products

■

Distributed Supply Regulation

■

Industrial Supplies

■

Wall Transformer Regulation

TYPICAL APPLICATION

3.3V Step-Down Converter

Efﬁciency

3.3V

10000.0

1000.0

100.0

10.0

OUT

4.5V TO

34V

RUN/SS

BOOST

OFF ON

16.2k

0.47μF

4.7μH

LT3481

GND

4.7μF

330pF

1.0

BIAS

= 12V

OUT

324k

= 3.3V

0.1

60.4k

L = 4.7μ

F = 800 kHz

200k

22μF

0.01

0.0001 0.001

0.01

0.1

LOAD CURRENT (A)

3481 TA01

3481 TA01b

3481fc

12 3 4 5 6 7...24

中文翻译

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与LT3481相关器件

型号	品牌	获取价格	描述	数据表
LT3481EDD	Linear	获取价格	36V, 2A, 2.8MHz Step-Down Switching Regulator
LT3481EDD#PBF	Linear	获取价格	LT3481 - 36V, 2A, 2.8MHz Step-Down Switching Regulator with 50µA Quiescent Curren
LT3481EDD#TR	Linear	获取价格	LT3481 - 36V, 2A, 2.8MHz Step-Down Switching Regulator with 50µA Quiescent Curren
LT3481EDD#TRPBF	Linear	获取价格	LT3481 - 36V, 2A, 2.8MHz Step-Down Switching Regulator with 50µA Quiescent Curren
LT3481EDD-PBF	Linear	获取价格	36V, 2A, 2.8MHz Step-Down Switching Regulator
LT3481EDD-TR	Linear	获取价格	36V, 2A, 2.8MHz Step-Down Switching Regulator
LT3481EDD-TRPBF	Linear	获取价格	36V, 2A, 2.8MHz Step-Down Switching Regulator
LT3481EMSE	Linear	获取价格	36V, 2A, 2.8MHz Step-Down Switching Regulator
LT3481EMSE#PBF	Linear	获取价格	LT3481 - 36V, 2A, 2.8MHz Step-Down Switching Regulator with 50µA Quiescent Curren
LT3481EMSE#TR	Linear	获取价格	LT3481 - 36V, 2A, 2.8MHz Step-Down Switching Regulator with 50µA Quiescent Curren

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