Datasheet > ML4866IS

ML4866IS

更新时间： 2024-09-14 22:54:47

品牌	Logo	应用领域
MICRO-LINEAR		转换器开关光电二极管
页数	文件大小	规格书
8页	250K
描述
3.3V Output DC-DC Step-Down Converter

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数据手册

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ML4866IS 数据手册

July 2000

ML4866*

3.3V Output DC–DC Step-Down Converter

GENERAL DESCRIPTION

FEATURES

The ML4866 is a high efficiency pulse width modulated

(PWM) buck regulator designed for use in 5V systems or

portable equipment that need a compact, efficienct 3.3V

supply. It has a switching frequency of 120kHz and uses

synchronous rectification to optimize power conversion

efficiency. Unlike other solutions, the ML4866 requires no

external diodes or FETs.

■ High power conversion efficiency over 2 decades of

load current

■ No external FETs or diodes; minimum external

components

■ 3.5V to 6.5V input voltage range

The ML4866 can provide up to 500mA of output current,

and operates over an input voltage range of 3.5V to 6.5V

(3 to 4 cells or a 5 VDC supply). A complete switched

mode power converter can be quickly and easily

implemented with few external components. Thanks to a

built-in autoburst mode, power conversion efficiency of

this DC–DC converter can exceed 90% over more than 2

decades of output load current.

■ Significantly extends battery life over linear regulator

based solutions

■ Micropower operation

■ Low shutdown mode quiescent current

Stability and fast loop response are provided by current

programming and a current sense circuit. The ML4866

also has a SHDN pin for use in systems which have power

management control. Undervoltage lockout and soft start

are also built in.

(* Indicates Part is End Of Life as of July 1, 2000)

BLOCK DIAGRAM

OUT

CURRENT

SENSE

BUCK

CONTROL

UVLO/

SHUTDOWN

OSC

ERROR

AMPLIFIER

SLOPE

COMPENSATION

REFERENCE

–

REF

BURST

SHDN

BURST

COMP

GND

REF

12 3 4 5 6 7 8

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