Datasheet > ML4890ES-T

ML4890ES-T

更新时间： 2024-09-15 22:07:19

品牌	Logo	应用领域
MICRO-LINEAR		稳压器开关光电二极管
页数	文件大小	规格书
12页	201K
描述
High Efficiency, Low Ripple Boost Regulator

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ML4890ES-T 数据手册

April 1997

FEATURING

–20°C to 70°C

ML4890

High Efficiency, Low Ripple Boost Regulator

GENERAL DESCRIPTION

FEATURES

The ML4890 is a high efficiency, PFM (Pulse Frequency

Modulation), boost switching regulator connected in

series with an integrated LDO (Low Dropout Regulator)

that incorporates “Silent Switcher™” technology. This

technique incorporates a patented tracking scheme to

minimize the voltage drop across the LDO and increase

the total efficiency of the regulator beyond that which can

be obtained by using a discrete external LDO regulator.

■ Incorporates “Silent Switcher™” technology to deliver

very low output voltage ripple (typically 5mV)

■ Guaranteed full load start-up and operation at 1.0V

input and low operating quiescent current (<100µA)

for extended battery life

■ Pulse Frequency Modulation and internal synchronous

rectification for high efficiency

■ Minimum external components

The ML4890 is designed to convert single or multiple cell

battery inputs to regulated output voltages for integrated

circuits and is ideal for portable communications

equipment that cannot tolerate the output voltage ripple

normally associated with switching regulators.

■ Low ON resistance internal switching MOSFETs

■ 5V, 3.3V, and 3V output versions

An integrated synchronous rectifier eliminates the need for

an external Schottky diode and provides a lower forward

voltage drop, resulting in higher conversion efficiency.

BLOCK DIAGRAM

BOOST

BAT

SHDN

OUT

BOOST

CONTROL

REF

LDO

CONTROL

OUT

FEEDBACK

–

PWR

GND

FROM

POWER

MANAGEMENT

Patent Pending

*Optional

12 3 4 5 6 7...12

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