ml4866 ETC-unknow, ml4866 Datasheet

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ml4866

Manufacturer Part Number
ml4866
Description
Manufacturer
ETC-unknow
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ml4866CS
Manufacturer:
IQC
Quantity:
6 500
Part Number:
ml4866CS
Manufacturer:
MICROLINEAR
Quantity:
20 000
GENERAL DESCRIPTION
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.
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.
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.
BLOCK DIAGRAM
5
V IN
SHUTDOWN
UVLO/
6
3.3V Output DC–DC Step-Down Converter
SHDN
REFERENCE
3
V REF
CURRENT
SENSE
BURST
4
BURST
COMPENSATION
SLOPE
OSC
FEATURES
(* Indicates Part is End Of Life as of July 1, 2000)
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
Significantly extends battery life over linear regulator
based solutions
Micropower operation
Low shutdown mode quiescent current
CONTROL
BUCK
+
AMPLIFIER
2
ERROR
COMP
+
7
V L
V REF
ML4866*
1
8
V OUT
GND
July 2000
1

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