Datasheet > LT3991EDDTRPBF

LT3991EDDTRPBF

更新时间： 2024-10-01 05:43:35

品牌	Logo	应用领域
凌特 - Linear		稳压器
页数	文件大小	规格书
24页	309K
描述
55V, 1.2A Step-Down Regulator with 2.8 Quiescent Current

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LT3991EDDTRPBF 数据手册

LT3991

55V, 1.2A Step-Down

Regulator with 2.8µA

Quiescent Current

FEATURES

DESCRIPTION

The LT^®3991 is an adjustable frequency monolithic buck

switchingregulatorthatacceptsawideinputvoltagerange

up to 55V. Low quiescent current design consumes only

2.8μAofsupplycurrentwhileregulatingwithnoload. Low

ripple Burst Mode operation maintains high efﬁciency at

low output currents while keeping the output ripple below

15mV in a typical application. An internally compensated

current mode topology is used for fast transient response

and good loop stability. A high efﬁciency 0.44Ω switch

is included on the die along with a boost Schottky diode

and the necessary oscillator, control and logic circuitry.

An accurate 1V threshold enable pin can be used to shut

down the LT3991, reducing the input supply current to

700nA. A capacitor on the SS pin provides a controlled

inrush current (soft-start). A power good ﬂag signals

Ultralow Quiescent Current:

2.8μA I Regulating 12V to 3.3V

OUT

Low Ripple Burst Mode^®Operation:

Output Ripple < 15mV

P-P

Wide Input Voltage Range: 4.3V to 55V

1.2A Maximum Output Current

Adjustable Switching Frequency: 200kHz to 2MHz

Synchronizable Between 250kHz to 2MHz

Fast Transient Response

Accurate 1V Enable Pin Threshold

Low Shutdown Current: I = 700nA

Power Good Flag

Soft-Start Capability

Internal Compensation

Saturating Switch Design: 0.44ꢀ On-Resistance

Output Voltage: 1.19V to 30V

Small Thermally Enhanced 10-Pin MSOP Package

and (3mm × 3mm) DFN Packages

when V

reaches 91% of the programmed output volt-

OUT

age. The LT3991 is available in small 10-pin MSOP and

3mm × 3mm DFN packages with exposed pads for low

thermal resistance.

APPLICATIONS

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

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

owners.

Automotive Battery Regulation

Power for Portable Products

Industrial Supplies

TYPICAL APPLICATION

3.3V Step Down Converter

No Load Supply Current

4.0

4.3V TO 55V

3.5

BOOST

OFF ON

0.47μF

10μH

10pF

3.0

2.5

2.0

1.5

1.0

3.3V

1.2A

OUT

LT3991

4.7μF

1.78M

118k

SYNC GND

47μF

3991 TA01

INPUT VOLTAGE (V)

3991 TA01b

3991f

12 3 4 5 6 7...24

中文翻译

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与LT3991EDDTRPBF相关器件

型号	品牌	获取价格	描述	数据表
LT3991EMSE#PBF	Linear	获取价格	LT3991 - 55V, 1.2A Step-Down Regulator with 2.8µA Quiescent Current; Package: MSO
LT3991EMSE#TRPBF	Linear	获取价格	LT3991 - 55V, 1.2A Step-Down Regulator with 2.8µA Quiescent Current; Package: MSO
LT3991EMSE-3.3#PBF	Linear	获取价格	LT3991 - 55V, 1.2A Step-Down Regulator with 2.8µA Quiescent Current; Package: MSO
LT3991EMSE-3.3#TRPBF	Linear	获取价格	LT3991 - 55V, 1.2A Step-Down Regulator with 2.8µA Quiescent Current; Package: MSO
LT3991EMSE-5#PBF	Linear	获取价格	LT3991 - 55V, 1.2A Step-Down Regulator with 2.8µA Quiescent Current; Package: MSO
LT3991EMSE-5#TRPBF	Linear	获取价格	LT3991 - 55V, 1.2A Step-Down Regulator with 2.8µA Quiescent Current; Package: MSO
LT3991EMSEPBF	Linear	获取价格	55V, 1.2A Step-Down Regulator with 2.8 Quiescent Current
LT3991EMSETRPBF	Linear	获取价格	55V, 1.2A Step-Down Regulator with 2.8 Quiescent Current
LT3991IDD#PBF	Linear	获取价格	LT3991 - 55V, 1.2A Step-Down Regulator with 2.8µA Quiescent Current; Package: DFN
LT3991IDD#TRPBF	Linear	获取价格	LT3991 - 55V, 1.2A Step-Down Regulator with 2.8µA Quiescent Current; Package: DFN

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