ML4872 datasheet(1/9 Pages) MICRO-LINEAR

tên linh kiện	ML4872

Giải thích chi tiết về linh kiện	High Current Boost Regulator with Shutdown

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nhà sản xuất	MICRO-LINEAR [Micro Linear Corporation]

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July 2000

ML4872

High Current Boost Regulator with Shutdown

GENERAL DESCRIPTION

The ML4872 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 ML4872

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%.

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 ML4872 requires only one

inductor and two capacitors to build a very small

regulator circuit capable of achieving conversion

efficiencies approaching 90%.

The SHDN input allows the user to stop the regulator from

switching and powers down the control circuitry.

BLOCK DIAGRAM

1

FEATURES

s

Guaranteed full load start-up and operation at

1.8V Input

s

Continuous conduction mode for high output current

s

Very low supply current (20µA output referenced) for

micropower operation

s

Pulse frequency modulation and internal synchronous

rectification for high efficiency

s

Maximum switching frequency > 200kHz

s

Minimum external components

s

Low ON resistance internal switching FETs

s

5V and 3.3V output versions

VL2

5

VOUT

6

+

–

VIN

2

SHDN

4

1.25V

START-UP

3

GND

VL1

1

SYNCHRONOUS

RECTIFIER

CONTROL

BOOST

CONTROL

+

–

+

–

8

PWR GND

FEATURING

Extended Commercial

Temperature

Range

-20˚C to 70˚C

for Portable

Handheld

Equipment

Số phần tương tự - ML4872

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Micro Linear Corporatio...	ML4870	211Kb / 8P	High Current Boost Regulator with Load Disconnect
	ML4870CS-3	211Kb / 8P	High Current Boost Regulator with Load Disconnect
	ML4870CS-5	211Kb / 8P	High Current Boost Regulator with Load Disconnect
	ML4870ES-3	211Kb / 8P	High Current Boost Regulator with Load Disconnect
	ML4870ES-5	211Kb / 8P	High Current Boost Regulator with Load Disconnect

More results

Mô tả tương tự - ML4872

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Fairchild Semiconductor	ML4854	133Kb / 13P	Adjustable, Low-Current, 2-Cell Boost Regulator with Shutdown and Low Battery Detect
Micro Linear Corporatio...	ML4771	190Kb / 8P	High Current Boost Regulator
	ML4775	177Kb / 8P	Adjustable Output Low Voltage Boost Regulator with Shutdown
	ML4870	211Kb / 8P	High Current Boost Regulator with Load Disconnect
	ML4871	237Kb / 9P	High Current Boost Regulator
	ML4875	196Kb / 10P	Low Voltage Boost Regulator with Shutdown
National Semiconductor ...	LM2757	721Kb / 14P	Switched Capacitor Boost Regulator with High Impedance Output in Shutdown
Texas Instruments	LM2757	1Mb / 20P	Switched Capacitor Boost Regulator with High Impedance Output in Shutdown
	LM2757	1Mb / 27P	LM2757 Switched-Capacitor Boost Regulator With High Impedance Output in Shutdown
	LM2757	1Mb / 27P	LM2757 Switched-Capacitor Boost Regulator With High Impedance Output in Shutdown

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