ML4854ET datasheet, PDF - EEWORLD Datasheet

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ML4854ET: DescriptionSwitching Regulator, 0.5A, 650kHz Switching Freq-Max, PDSO8, TSSOP-8; CategoryPower/power management The power supply circuit; File Size397KB，13 Pages; ManufacturerFairchild; Websitehttp://www.fairchildsemi.com/

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ML4854ET Overview

Switching Regulator, 0.5A, 650kHz Switching Freq-Max, PDSO8, TSSOP-8

ML4854ET Parametric

Parameter Name	Attribute value
Maker	Fairchild
Parts packaging code	SOIC
package instruction	TSSOP,
Contacts	8
Reach Compliance Code	unknown
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR
Control Technology	PULSE FREQUENCY MODULATION
Maximum input voltage	4.5 V
Minimum input voltage	1.5 V
Nominal input voltage	1.5 V
JESD-30 code	R-PDSO-G8
length	4.4 mm
Number of functions	1
Number of terminals	8
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Maximum output current	0.5 A
Package body material	PLASTIC/EPOXY
encapsulated code	TSSOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Certification status	Not Qualified
Maximum seat height	1.2 mm
surface mount	YES
Switch configuration	BOOST
Maximum switching frequency	650 kHz
Temperature level	INDUSTRIAL
Terminal form	GULL WING
Terminal pitch	0.65 mm
Terminal location	DUAL
width	3 mm
Base Number Matches	1

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www.fairchildsemi.com

ML4854

Adjustable, Low-Current, 2-Cell Boost Regulator

with Shutdown and Low Battery Detect

Features

•

95% Efﬁciency at 200mA Load Current

Integrated peak current limit

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

General Description

The ML4854 is a low power boost regulator designed for

low voltage DC to DC conversion in 2 cell battery powered

systems such as cellular phones and PDAs. The converter

starts-up at 1.3V and has an Operating Input Voltage range

from 1.5V 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.

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.

The ML4854 is available in the 8 lead TSSOP Package.

Applications

•

2 cell Hand-held Devices

Wireless Phones

Medical Devices

PDAs

Portable Instrumentation

Typical Application

Input 1.5V

to 4.5V

ML4854

Off

Low Battery

Detect In

Low Battery

Detect Out

1 V

2 SHDN

3 LBI

4 LB0

GND 8

OUT

FB 5

Output 3.3V to 5V

up to 0.5A

REV. 1.0.3 2/4/02

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