Datasheet > LP3891ET-1.8

LP3891ET-1.8

更新时间： 2024-11-13 22:09:43

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美国国家半导体 - NSC		调节器输出元件局域网
页数	文件大小	规格书
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描述
0.8A Fast-Response Ultra Low Dropout Linear

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LP3891ET-1.8 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

12 3 4 5 6 7...12

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与LP3891ET-1.8相关器件

型号	品牌	获取价格	描述	数据表
LP3891ET-1.8/NOPB	TI	获取价格	1.8V FIXED POSITIVE LDO REGULATOR, 0.4V DROPOUT, PZFM5, MOLDED, STAGGER BEND, TO-220, 5 PI
LP3892	NSC	获取价格	1.5A Fast-Response Ultra Low Dropout Linear Regulators
LP3892	TI	获取价格	LP3892 1.5A Fast-Response Ultra Low Dropout Linear Regulators
LP3892EMR-1.2	TI	获取价格	LP3892 1.5A Fast-Response Ultra Low Dropout Linear Regulators
LP3892EMR-1.2/NOPB	NSC	获取价格	IC VREG 1.216 V FIXED POSITIVE LDO REGULATOR, 0.55 V DROPOUT, PDSO8, MOLDED, PSOP-8, Fixed
LP3892EMR-1.2/NOPB	ROCHESTER	获取价格	1.216V FIXED POSITIVE LDO REGULATOR, 0.55V DROPOUT, PDSO8, MOLDED, PSOP-8
LP3892EMR-1.2/NOPB	TI	获取价格	具有使能功能的 1.5A、超低压降稳压器 \| DDA \| 8 \| -40 to 125
LP3892EMR-1.5	TI	获取价格	LP3892 1.5A Fast-Response Ultra Low Dropout Linear Regulators
LP3892EMR-1.5/NOPB	TI	获取价格	具有使能功能的 1.5A、超低压降稳压器 \| DDA \| 8 \| -40 to 125
LP3892EMR-1.8	TI	获取价格	LP3892 1.5A Fast-Response Ultra Low Dropout Linear Regulators

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