Datasheet > LP38858

LP38858

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器软启动
页数	文件大小	规格书
14页	362K
描述
1.5A Fast-Response High-Accuracy LDO Linear Regulator with Soft-Start

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LP38858 数据手册

November 2006

LP38858

1.5A Fast-Response High-Accuracy LDO Linear Regulator

with Soft-Start

General Description

Features

The LP38858 is a high current, fast response regulator which

can maintain output voltage regulation with extremely low in-

put to output voltage drop. Fabricated on a CMOS process,

the device operates from two input voltages: V_BIASprovides

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

V_INis the input voltage which supplies power to the load. The

use of an external bias rail allows the part to operate from ultra

low V_INvoltages. Unlike bipolar regulators, the CMOS archi-

tecture consumes extremely low quiescent current at any

output load current. The use of an N-MOS power transistor

results in wide bandwidth, yet minimum external capacitance

is required to maintain loop stability.

Standard V_OUTvalues of 0.8V and 1.2V

■

Wide V_BIASSupply operating range of 3.0V to 5.5V

Stable with 10µF Ceramic capacitors

Dropout voltage of 130 mV (typical) at 1.5A load current

Precision Output Voltage across all line and load

conditions:

■

±1.0% V_OUTfor T_J= 25°C

—

±2.0% V_OUTfor 0°C ≤ T_J≤ +125°C

±3.0% V_OUTfor -40°C ≤ T_J≤ +125°C

Over-Temperature and Over-Current protection

Available in 5 lead TO-220 and TO-263 packages

Custom V_OUTvalues between 0.8V and 1.2V are available

−40°C to +125°C Operating Temperature Range

■

The fast transient response of this device makes it suitable

for use in powering DSP, Microcontroller Core voltages and

Switch Mode Power Supply post regulators. The LP38858 is

available in TO-220 and TO-263 5-Lead packages.

Dropout Voltage: 130mV (typical) at 1.5A load current.

Low Ground Pin Current: 14 mA (typical) at 1.5A load cur-

rent.

Applications

ASIC Power Supplies In:

■

- Desktops, Notebooks, and Graphics Cards, Servers

- Gaming Set Top Boxes, Printers and Copiers

Soft-Start: Programmable Soft-Start time.

Precision Output Voltage: ±1.0% for T_J= 25°C and ±2.0%

for 0°C ≤ T_J≤ +125°C, across all line and load conditions

Server Core and I/O Supplies

■

DSP and FPGA Power Supplies

SMPS Post-Regulator

Typical Application Circuit

20202701

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