Datasheet > ML4869CS-5

ML4869CS-5

更新时间： 2024-09-14 22:25:51

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
8页	203K
描述
Medium Current Boost Regulator with Load Disconnect

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ML4869CS-5 数据手册

July 2000

PRELIMINARY

ML4869

Medium Current Boost Regulator

with Load Disconnect

GENERAL DESCRIPTION

FEATURES

The ML4869 is a continuous conduction boost regulator

designed for DC to DC conversion in multiple cell battery

power 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 ML4869

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

■ Pulse Frequency Modulation and internal synchronous

rectification for high efficiency

■ Isolates the load from the input during shutdown

■ Minimum external components

■ Low ON resistance internal switching FETs

■ Low supply current

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 current and variable

frequency operation result in high efficiency even at light

loads. The ML4869 requires only a few external

components to build a very small regulator capable of

achieving conversion efficiencies approaching 85%.

■ 5V and 3.3V output versions

■ Shutdown current = 1µA MAX

The SHDN input allows the user to stop the regulator from

switching, and provides complete isolation of the load

from the battery.

BLOCK DIAGRAM

SHDN

SHUTDOWN

CONTROL

SYNCHRONOUS

START-UP

RECTIFIER

CONTROL

OUT

–

BOOST

CONTROL

2.4V

SHDN

PWR GND

GND

12 3 4 5 6 7 8

中文翻译

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