FAN4855

更新时间： 2024-11-20 22:50:59

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		稳压器电池
页数	文件大小	规格书
13页	149K
描述
500mA High Efficiency Boost Regulator with Adjustable Output, Shutdown and Low Battery Detect

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FAN4855 数据手册

www.fairchildsemi.com

FAN4855

500mA High Efﬁciency Boost Regulator with

Adjustable Output, Shutdown and Low Battery Detect

Features

General Description

• Low power PFM boost regulator

The FAN4855 is a low power boost regulator designed for

low voltage DC to DC conversion in 2-cell battery powered

systems such as digital cameras, cell phones and PDAs.

The converter starts-up at 1.3V and operates after the start at

an input voltage as low as 1V. Output voltage can be adjusted

by external resistors from 3.3V to 5V with a maximum load

current of 0.5A. Quiescent current in shut-down mode is

less than 10µA, which maximizes the battery live time. The

ON time changes with the input voltage to maintain the

ripple current constant and to provide the highest efﬁciency

over a wide load range—while maintaining low peak

currents in the boost inductor. The combination of built-in

power transistors, synchronous rectiﬁcation and low supply

current, make the FAN4855 ideal for portable applications.

The FAN4855 is available in 8-lead MSOP and TSSOP

packages.

• Input voltage range is from 1.6V to 4.5V

• Output voltage range is from 3V to 5V

• 500mA maximum load current capability

• 95% efﬁcient power conversion

• 2-3 cell and single cell Li-Ion systems

• Variable on-time Pulse Frequency Modulation (PFM)

• Internal synchronous rectiﬁer (no need for external diode)

• Low-battery detection

• Logic controlled shutdown with true-load disconnect

• Low (80µA) quiescent current

• MSOP-8 and TSSOP-8 Packages

Applications

• DSCs

• PDAs

• Cell phones, smart phones

• Portable instrumentations

• 2-3 AA / AAA cells operated devices

• Single cell Li-Ion operated devices

Typical Application

Input 1.6V

to 4.5V

FAN4855

V_IN

GND

V_L

Off

SHDN

LBI

Output 3.3V to 5V

up to 0.5A

Low Battery

Detect In

Low Battery

Detect Out

V_OUT

LB0

REV. 1.0.0 3/17/04

12 3 4 5 6 7...13

中文翻译

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与FAN4855相关器件

型号	品牌	获取价格	描述	数据表
FAN4855MTC	FAIRCHILD	获取价格	500mA High Efficiency Boost Regulator with Adjustable Output, Shutdown and Low Battery Det
FAN4855MTCX	FAIRCHILD	获取价格	500mA High Efficiency Boost Regulator with Adjustable Output, Shutdown and Low Battery Det
FAN4855MTCX_NL	FAIRCHILD	获取价格	Switching Regulator, Current-mode, 0.5A, PDSO8, LEAD FREE, TSSOP-8
FAN4855MU	FAIRCHILD	获取价格	500mA High Efficiency Boost Regulator with Adjustable Output, Shutdown and Low Battery Det
FAN4855MUX	FAIRCHILD	获取价格	500mA High Efficiency Boost Regulator with Adjustable Output, Shutdown and Low Battery Det
FAN4860	FAIRCHILD	获取价格	3MHz, 5V Output Synchronous TinyBoostâ¢ Regu
FAN4860	ONSEMI	获取价格	3 MHz, Synchronous TinyBoost Regulator
FAN4860UC33X	ONSEMI	获取价格	3 MHz, Synchronous TinyBoost Regulator
FAN4860UC54X	ONSEMI	获取价格	3 MHz, Synchronous TinyBoost Regulator
FAN4860UC5X	FAIRCHILD	获取价格	3MHz, 5V Output Synchronous TinyBoost™ Regula

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