Datasheet > MBRA340T3

MBRA340T3

更新时间： 2024-11-15 12:46:39

品牌	Logo	应用领域
凌特 - Linear		稳压器二极管开关光电二极管
页数	文件大小	规格书
24页	293K
描述
42V, 2.5A, 2MHz Step-Down Switching Regulator with 2.7Î¼A Quiescent Current

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MBRA340T3 数据手册

LT3975

42V, 2.5A, 2MHz Step-Down

Switching Regulator with

2.7µA Quiescent Current

FEATURES

DESCRIPTION

The LT^®3975 is an adjustable frequency monolithic buck

switchingregulatorthatacceptsawideinputvoltagerange

up to 42V. Low quiescent current design consumes only

2.7µAofsupplycurrentwhileregulatingwithnoload. Low

ripple Burst Mode operation maintains high efficiency at

low output currents while keeping the output ripple below

15mV in a typical application. The LT3975 can supply up

to 2.5A of load current and has current limit foldback to

limit power dissipation during short circuit. A low dropout

voltage of 500mV is maintained when the input voltage

drops below the programmed output voltage, such as

during automotive cold crank.

Ultralow Quiescent Current:

2.7µA I at 12V to 3.3V

OUT

Low Ripple Burst Mode^®Operation

Output Ripple < 15mV

P-P

Wide Input Range: Operation from 4.3V to 42V

2.5A Maximum Output Current

Excellent Start-Up and Dropout Performance

Adjustable Switching Frequency: 200kHz to 2MHz

Synchronizable Between 250kHz to 2MHz

Accurate Programmable Undervoltage Lockout

Low Shutdown Current: I = 700nA

Power Good Flag

Soft-Start Capability

Thermal Shutdown Protection

An internally compensated current mode topology is used

for fast transient response and good loop stability. A high

efficiency 75mΩ switch is included on the die along with a

boostSchottkydiodeandthenecessaryoscillator,control,

andlogiccircuitry. Anaccurate1.02Vthresholdenablepin

can be driven directly from a microcontroller or used as a

programmable undervoltage lockout. A capacitor on the

SS pin provides a controlled inrush current (soft-start).

Current Limit Foldback with Soft-Start Override

Saturating Switch Design: 75mΩ On Resistance

Small, Thermally Enhanced 16-Lead MSOP Package

APPLICATIONS

Automotive Battery Regulation

Portable Products

A power good flag signals when V

reaches 91.6% of

OUT

Industrial Supplies

the programmed output voltage. The LT3975 is available

in a small 16-lead MSOP package with exposed pad for

low thermal resistance.

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.

TYPICAL APPLICATION

No-Load Supply Current

4.5

3.3V Step-Down Converter

IN REGULATION

4.3V TO 42V

4.0

3.5

OFF ON

BOOST

3.3µH

0.47µF

3.0

2.5

2.0

1.5

10µF

PDS560

LT3975

OUT

3.3V

2.5A

OUT

10pF

SYNC

GND

10nF

47µF

1210

78.7k

576k

1.0

INPUT VOLTAGE (V)

20 25 30

3975 TA01a

f = 600kHz

3975 TA01b

3975f

12 3 4 5 6 7...24

中文翻译

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