APE2903N-2.8V datasheet, PDF - EEWORLD Datasheet

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APE2903N-2.8V: DescriptionIC SWITCHING REGULATOR, 150 kHz SWITCHING FREQ-MAX, PDSO3, LEAD FREE, SOT-23, 3 PIN, Switching Regulator or Controller; CategoryPower/power management The power supply circuit; File Size113KB，5 Pages; ManufacturerAPEC

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APE2903N-2.8V Overview

IC SWITCHING REGULATOR, 150 kHz SWITCHING FREQ-MAX, PDSO3, LEAD FREE, SOT-23, 3 PIN, Switching Regulator or Controller

APE2903N-2.8V Parametric

Parameter Name	Attribute value
Objectid	1052552573
Parts packaging code	SOT-23
package instruction	SOP,
Contacts	3
Reach Compliance Code	compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR
Nominal input voltage	1.8 V
JESD-30 code	R-PDSO-G3
Number of functions	1
Number of terminals	3
Nominal output voltage	2.8 V
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
surface mount	YES
Switch configuration	BOOST
Maximum switching frequency	150 kHz
Terminal form	GULL WING
Terminal location	DUAL

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Advanced Power

Electronics Corp.

FEATURES

Very Low Supply Current

Regulated Output Voltage

Wide Range of Output Voltage is Available from

2.2V to 5.0V by 0.1V Steps

Output Voltage Accuracy ±5%

Output Current up to 100mA

Low Ripple and Low Noise

Very Low Start-up Voltage

High Efficiency (Vout = 5V TYP. 87%)

Few External Components

Internal Soft-Start

Low Profile: SOT-23, SOT-89 & SOT-23-5L Pb-Free

Preliminary

APE2903

MICROPOWER VFM STEP-UP DC/DC CONVERTER

DESCRIPTION

The APE2903 is a high efficiency VFM Step-up DC/DC

converter for small, low input voltage or battery powered

systems with ultra low quiescent supply current. The

APE2903 accept a positive input voltage from start-up

voltage to VOUT and convert it to a higher output voltage in

the 2.2 to 5V range.

The APE2903 combine ultra low quiescent supply

current and high efficiency to give maximum battery life. The

high switching frequency and the internally limited peak

inductor current permits the use of small, low cost inductors.

Only three external components are needed an inductor a

diode and an output capacitor.

The APE2903 is suitable to be used in battery powered

equipment where low noise, low ripple and ultra low supply

current are required. The APE2903 is available in very small

package: SOT-23, SOT-89 & SOT-23-5L.

Typical applications are pagers, cameras & video

camera, cellular telephones, wireless telephones, palmtop

computer, battery backup supplies, battery powered

equipment.

TYPICAL APPLICATION

VIN

47uH

Vout

B140

GND

NC OUT

APE2903

100uF

0.1uF

47uF

ORDERING INFORMATION

APE2903X - XX

Package Type

Y5 : SOT-23-5L

N : SOT-23

G : SOT-89

VOUT

22 : 2.2V

25 : 2.5V

26 : 2.6V

27 : 2.7V

50 : 5.0V

Data and specifications subject to change without notice

20110914pre

Advanced Power

Electronics Corp.

BLOCK DIAGRAM

OUT

APE2903

REF

LIMITER AMP.

VFM

CONTROL

ERROR AMP.

Driver

GND

OPERATION

The APE2903 architecture is built around a VFM CONTROL logic core, switching

frequency is set through a built in oscillator. T

time is fixed (Typ. 5uS) while T

OFF

time is

determined by the error amplifier output, a logic signal coming from the comparison made

by the Error Amplifier Stage between the signal coming from the output voltage divider

network and the internal Band-Gap voltage reference (Vref). T

OFF

reaches a minimum

(Typ. 1.7uS) when heavy load conditions are met (Clock frequency 150KHz). An over

current conditions, through the internal power switch, causes a voltage drop V

DSON

and the V

limiter block forces the internal switch to be off, so narrowing TON time

and limiting internal power dissipation. In this case the switching frequency may be higher

than the 150KHz set by the internal clock generator.

VFM control ensures very low quiescent current and high conversion efficiency even

with very light loads. Since the Output Voltage pin is also used as the device Supply

Voltage, the versions with higher output voltage present an higher internal supply voltage

that results in lower power switch R

DSON

, slightly greater output power and higher

efficiency. Moreover, bootstrapping allows the input voltage to sag to 0.6V (at I

OUT

=1mA)

once the system is started. If the input voltage exceeds the output voltage, the output will

follow the input, however, the input or output voltage must not be forced above 5.5V.

APPLICATION INFORMATION

INPUT/OUTPUT CAPACITOR SELECTION

The Output Ripple Voltage, as well as the Efficiency, is strictly related to the behavior

of these elements. The output ripple voltage is the product of the peak inductor current

and the output capacitor Equivalent Series Resistance (ESR). Best performances are

obtained with good high frequency characteristics capacitors and low ESR. The best

compromise for the value of the Output Capacitance is 47µF Tantalum Capacitor; Lower

values may cause higher Output Ripple Voltage and lower Efficiency without

compromising the functionality of the device.

An Input Capacitor is required to compensate, if present, the series impedance between

the Supply Voltage Source and the Input Voltage of the Application.

INDUCTOR SELECTION

A 47

H inductor is recommended for most APE2903 applications. However, the

inductance value isnot critical, and the APE2903 will work with inductors in the 33 µ H to

120µH.

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