ML4854

更新时间： 2024-09-13 22:54:47

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	134K
描述
Adjustable, Low-Current, 2-Cell Boost Regulator with Shutdown and Low Battery Detect

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ML4854 数据手册

www.fairchildsemi.com

ML4854

Adjustable, Low-Current, 2-Cell Boost Regulator

with Shutdown and Low Battery Detect

Features

General Description

• 95% Efﬁciency at 200mA Load Current

• Integrated Peak Current Limit

The ML4854 is a low power boost regulator designed for

low voltage DC to DC conversion in two-cell battery pow-

ered systems such as cell phones and PDAs. The converter

starts up at 1.3V and has an operating input voltage range

from 1.6V to 4.5V. After the start it operates at an input

voltage as low as 0.8V. Output voltage can be adjusted by

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

current of 0.5A.

• Variable Output Voltage Determined by External Resistors

• Variable On-time Pulse Frequency Modulation (PFM)

• Fully Internal Synchronous Rectiﬁer (no external diodes)

for High Efﬁciency and Low Peak Currents

• Low-Battery Detection

• Logic Controlled Shutdown with True Load Disconnect

Quiescent current in shut down mode is less than 30µA,

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 integrated synchronous rectiﬁcation,

variable frequency operation, and low supply current make

ML4854 ideal for portable applications.

Applications

• 2-3 alkaline/NiMH cells or 1 Li-Ion cell Operated Devices

• Cell Phones

• Medical Devices

• PDAs

• Portable Instrumentation

The ML4854 is available in an 8 lead TSSOP package.

Typical Application

Input 1.6V

to 4.5V

ML4854

V_IN

GND

Off

SHDN

LBI

V_L

Output 3.3V to 5V

up to 0.5A

Low Battery

Detect In

Low Battery

Detect Out

V_OUT

LB0

REV. 1.0.7 5/6/03

12 3 4 5 6 7...13

中文翻译

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与ML4854相关器件

型号	品牌	获取价格	描述	数据表
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
ML485-G	TRIQUINT	获取价格	1.5-3.2 GHz High IP3 Mixer with Integrated LO Amp
ML485-G_15	TRIQUINT	获取价格	1.5-3.2 GHz High IP3 Mixer with Integrated LO Amp
ML485-PCB	TRIQUINT	获取价格	1.6-3.2 GHz High IP3 Mixer with Integrated LO Amp
ML4861	MICRO-LINEAR	获取价格	Low Voltage Boost Regulator