Datasheet > LP3891

LP3891

更新时间： 2024-11-13 22:55:47

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
12页	305K
描述
0.8A Fast-Response Ultra Low Dropout Linear

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LP3891 数据手册

September 2003

LP3891

0.8A Fast-Response Ultra Low Dropout Linear

Regulators

General Description

Features

n Ultra low dropout voltage (100mV 0.8A typ)

The LP3891 is a high current, fast response regulator which

can maintain output voltage regulation with minimum input to

output voltage drop. Fabricated on a CMOS process, the

device operates from two input voltages: Vbias provides

voltage to drive the gate of the N-MOS power transistor,

while Vin is the input voltage which supplies power to the

load. The use of an external bias rail allows the part to

operate from ultra low Vin voltages. Unlike bipolar regula-

tors, the CMOS architectutre consumes extremely low qui-

escent current at any output load current. The use of an

n Low ground pin current

n Load regulation of 0.04%/A

n 60 nA typical quiescent current in shutdown

n 1.5% output accuracy (25˚C)

n TO-220, TO-263 packages

n Over temperature/over current protection

n −40˚C to +125˚C junction temperature range

N-MOS power transistor results in wide bandwidth, yet mini- Applications

mum external capacitance is required to maintain loop sta-

bility.

n DSP Power Supplies

n Server Core and I/O Supplies

n PC Add-in-Cards

n Local Regulators in Set-Top Boxes

n Microcontroller Power Supplies

n High Efficiency Power Supplies

n SMPS Post-Regulators

The fast transient response of these devices makes them

suitable for use in powering DSP, Microcontroller Core volt-

ages and Switch Mode Power Supply post regulators. The

parts are available in TO-220 and TO-263 packages.

Dropout Voltage: 100 mV (typ) 0.8A load current.

Ground Pin Current: 3 mA (typ) at full load.

Shutdown Current: 60 nA (typ) when S/D pin is low.

Precision Output Voltage: 1.5% room temperature accu-

racy.

Typical Application Circuit

20069501

At least 10 µF of input and output capacitance is required for stability.

*Tantalum capacitors are recommended. Aluminum electrolytic capacitors may be used for restricted temperature range. See application hints.

Connection Diagrams

20069502

20069503

TO-220, Top View

TO-263, Top View

DS200695

www.national.com

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与LP3891相关器件

型号	品牌	获取价格	描述	数据表
LP3891EMR-1.2	NSC	获取价格	IC VREG 1.216 V FIXED POSITIVE LDO REGULATOR, 0.43 V DROPOUT, PDSO8, MOLDED, PSOP-8, Fixed
LP3891EMR-1.2	TI	获取价格	LP3891 0.8A Fast-Response Ultra Low Dropout Linear Regulators
LP3891EMR-1.2/NOPB	TI	获取价格	具有使能功能的 800mA、超低压降稳压器 \| DDA \| 8 \| -40 to 125
LP3891EMR-1.5/NOPB	TI	获取价格	1.5V FIXED POSITIVE LDO REGULATOR, 0.43V DROPOUT, PDSO8, MOLDED, PSOP-8
LP3891EMR-1.8	TI	获取价格	LP3891 0.8A Fast-Response Ultra Low Dropout Linear Regulators
LP3891EMR-1.8	NSC	获取价格	IC VREG 1.8 V FIXED POSITIVE LDO REGULATOR, 0.43 V DROPOUT, PDSO8, MOLDED, PSOP-8, Fixed P
LP3891EMR-1.8/NOPB	NSC	获取价格	IC VREG 1.8 V FIXED POSITIVE LDO REGULATOR, 0.43 V DROPOUT, PDSO8, MOLDED, PSOP-8, Fixed P
LP3891EMR-1.8/NOPB	TI	获取价格	0.8A Fast-Response Ultra Low Dropout Linear Regulators
LP3891EMR-12	TI	获取价格	LP3891 0.8A Fast-Response Ultra Low Dropout Linear Regulators
LP3891EMRX-1.2	TI	获取价格	LP3891 0.8A Fast-Response Ultra Low Dropout Linear Regulators

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