LT1777IS

更新时间： 2024-01-29 05:49:16

品牌	Logo	应用领域
凌特 - Linear		稳压器开关光电二极管
页数	文件大小	规格书
24页	272K
描述
Low Noise Step-Down Switching Regulator

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中文翻译

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数据手册

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LT1777IS 数据手册

LT1777

Low Noise Step-Down

Switching Regulator

FEATURES

DESCRIPTIO

TheLT^®1777isaBuck(step-down)regulatordesignedfor

noise sensitive applications. It contains a dI/dt limiting

circuit programmed via a small external inductor in the

switchingpath.Internalcircuitryalsogeneratescontrolled

dV/dt ramp rates.

■

Programmable dI/dt Limit

■

Internally Limited dV/dt

■

High Input Voltage: 48V Max

■

700mA Peak Switch Rating

■

True Current Mode Control

■

100kHz Fixed Operating Frequency

The monolithic die includes all oscillator, control and

protection circuitry. The part can accept operating input

voltages as high as 48V, and contains an output switch

rated at 700mA peak current. Current mode control offers

excellent dynamic input supply rejection and short-circuit

protection. The internal control circuitry is normally pow-

ered via the V_CCpin, thereby minimizing power drawn

directly from the V_INsupply (see Applications Informa-

tion). The fused-lead SO16 package and 100kHz switch-

ing frequency allow for minimal PC board area

■

Synchronizable to 250kHz

■

Low Supply Current in Shutdown: 30µA

■

Low Thermal Resistance 16-Pin SO Package

APPLICATIO S

■

Automotive Cellular and GPS Receivers

■

Telecom Power Supplies

■

Industrial Instrument Power Supplies

requirements.

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

TYPICAL APPLICATIO

Low Noise 5V Step-Down Supply

V_SWSwitching Waveforms

24V

39µF

63V

SHDN

LT1777

SYNC

100pF

V_SW

VOLTAGE

10V/DIV

1µH*

220µH

OUT

400mA

100µF

10V

36.5k

MBRS1100

100pF 12k

2200pF

SGND

V_SW

CURRENT

200mA/DIV

12.1k

1777 TA01

*PROGRAMS dI/dT

1777 TA02

500ns/DIV

12 3 4 5 6 7...24

中文翻译

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