Datasheet > ML4851ES-3

ML4851ES-3

更新时间： 2024-09-13 22:09:43

品牌	Logo	应用领域
MICRO-LINEAR		稳压器
页数	文件大小	规格书
9页	289K
描述
Low Current, Voltage Boost Regulator

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中文翻译

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ML4851ES-3 数据手册

FEATURING

Extended Commercial Temperature Range

-20˚C to 70˚C

for Portable Handheld Equipment

ML4851*

Low Current, Voltage Boost Regulator

GENERAL DESCRIPTION

FEATURES

The ML4851 is a low power boost regulator designed for

DC to DC conversion in 1 to 3 cell battery powered

systems. The maximum switching frequency can exceed

100kHz, allowing the use of small, low cost inductors.

n Guaranteed full load start-up and operation at 1V input

n Maximum switching frequency > 100kHz

n Pulse Frequency Modulation (PFM) and internal

The combination of BiCMOS process technology, internal

synchronous rectification, variable frequency operation,

and low supply current make the ML4851 ideal for 1 cell

applications. The ML4851 is capable of start-up with input

voltages as low as 1V and is available in 5V and 3.3V

output versions with output voltage accuracy of ±3%.

synchronous rectification for high efficiency

n Minimum external components

n Low ON resistance internal switching FETs

n Micropower operation

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 ML4851 requires only one

inductor and two capacitors to build a very small

regulator circuit capable of achieving conversion

efficiencies in excess of 90%.

n 5V and 3.3V output versions

The circuit also contains a RESET output which goes low

when the IC can no longer function due to low input

voltage, or when the DETECT input drops below 200mV.

*Some Packages Are Obsolete

BLOCK DIAGRAM

DETECT

RESET

COMP

–

REF

START-UP

OUT

PWR

–

5µs

ONE SHOT

GND

–

REF

REFERENCE

REF

GND

REF

July, 2000

DATASHEET

12 3 4 5 6 7...9

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与ML4851ES-3相关器件

型号	品牌	获取价格	描述	数据表
ML4851ES-5	MICRO-LINEAR	获取价格	Low Current, Voltage Boost Regulator
ML4851IS-3	MICRO-LINEAR	获取价格	Low Current, Voltage Boost Regulator
ML4851IS-5	MICRO-LINEAR	获取价格	Low Current, Voltage Boost Regulator
ML4854	FAIRCHILD	获取价格	Adjustable, Low-Current, 2-Cell Boost Regulator with Shutdown and Low Battery Detect
ML4854ET	FAIRCHILD	获取价格	Switching Regulator, 0.5A, 650kHz Switching Freq-Max, PDSO8, TSSOP-8
ML4854IT	FAIRCHILD	获取价格	Adjustable, Low-Current, 2-Cell Boost Regulator with Shutdown and Low Battery Detect
ML4854IT	ROCHESTER	获取价格	Switching Regulator, 0.5A, 650kHz Switching Freq-Max, PDSO8, TSSOP-8
ML4854ITX	ROCHESTER	获取价格	0.5 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO8, TSSOP-8
ML4854ITX	FAIRCHILD	获取价格	Switching Regulator, Voltage-mode, 0.5A, 650kHz Switching Freq-Max, PDSO8, TSSOP-8
ML4854T	FAIRCHILD	获取价格	Switching Regulator, Voltage-mode, 0.8A, PDSO8, TSSOP-8