ML4871CS-3 datasheet(1/9 Pages) MICRO-LINEAR

tên linh kiện	ML4871CS-3

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GENERAL DESCRIPTION

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%.

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%.

The circuit also contains a RESET output which goes low

when the DETECT input drops below 1.25V.

BLOCK DIAGRAM

July 2000

ML4871

High Current Boost Regulator

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

1.25V

START-UP

3

GND

VL1

1

DETECT

4

SYNCHRONOUS

RECTIFIER

CONTROL

BOOST

CONTROL

+

–

+

–

8

PWR GND

RESET

VREF

+

–

COMP

7

FEATURING

Extended Commercial

Temperature

Range

-20˚C to 70˚C

for Portable

Handheld

Equipment

Số phần tương tự - ML4871CS-3

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

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Mô tả tương tự - ML4871CS-3

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Fairchild Semiconductor	ML4865	126Kb / 10P	High Voltage High Current Boost Regulator
Micro Linear Corporatio...	ML4771	190Kb / 8P	High Current Boost Regulator
	ML4851	286Kb / 9P	Low Current, Voltage Boost Regulator
	ML4865	234Kb / 10P	High Voltage High Current Boost Regulator
	ML4870	211Kb / 8P	High Current Boost Regulator with Load Disconnect
	ML4872	249Kb / 9P	High Current Boost Regulator with Shutdown
Sipex Corporation	SP6648	262Kb / 16P	Ultra-low Quiescent Current, High Efficiency Boost Regulator
	SP6648	260Kb / 16P	Ultra-low Quiescent Current, High Efficiency Boost Regulator
	SP6648EU-L	1Mb / 34P	Ultra-low Quiescent Current, High Efficiency Boost Regulator
Renesas Technology Corp	ISL91106	206Kb / 2P	High Efficiency High Current Buck-Boost Regulator with Bypass Mode

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Số phần tương tự - ML4871CS-3

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