Datasheet > ML4871CS-3

ML4871CS-3

更新时间： 2024-11-05 22:09:35

品牌	Logo	应用领域
MICRO-LINEAR		稳压器
页数	文件大小	规格书
9页	239K
描述
High Current Boost Regulator

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ML4871CS-3 数据手册

July 2000

FEATURING

Extended Commercial Temperature Range

ML4871

-20˚C to 70˚C

for Portable Handheld Equipment

High Current Boost Regulator

GENERAL DESCRIPTION

FEATURES

The ML4871 is a continuous conduction boost regulator

designed for DC to DC conversion in multiple cell battery

powered systems. Continuous conduction allows the

regulator to maximize output current for a given inductor.

The maximum switching frequency can exceed 200kHz,

allowing the use of small, low cost inductors. The ML4871

is capable of start-up with input voltages as low as 1.8V

and is available in 5V and 3.3V output versions with an

output voltage accuracy of ±3%.

■ Guaranteed full load start-up and operation

at 1.8V Input

■ Continuous conduction mode for high output current

■ Very low supply current (20µA output referenced) for

Micropower operation

■ Pulse Frequency Modulation and Internal Synchronous

Rectification for high efficiency

An integrated synchronous rectifier eliminates the need for

an external Schottky diode and provides a lower forward

voltage drop, resulting in higher conversion efficiency. In

addition, low quiescent battery current and variable

frequency operation result in high efficiency even at light

loads. The ML4871 requires only one inductor and two

capacitors to build a very small regulator circuit capable

of achieving conversion efficiencies approaching 90%.

■ Maximum switching frequency > 200kHz

■ Minimum external components

■ Low ON resistance internal switching FETs

■ 5V and 3.3V output versions

The circuit also contains a RESET output which goes low

when the DETECT input drops below 1.25V.

BLOCK DIAGRAM

RESET

DETECT

COMP

–

REF

SYNCHRONOUS

RECTIFIER

START-UP

OUT

CONTROL

–

BOOST

CONTROL

1.25V

GND

PWR GND

12 3 4 5 6 7...9

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