IS31AP2145A-UTLS2-TR Datasheet IS31AP2145A-UTLS2-TR | P1-P3

IS31AP2145A

Integrated Silicon Solution, Inc. – www.issi.com 1

Rev.A, 11/20/2011

2.9W@5.0V MONO CLIP-LESS & FILTER-LESS CLASS-D

AUDIO POWER AMPLIFIER

December 2011

GENERAL DESCRIPTION

The IS31AP2145A is a 2.9W@5.0V mono, clip-less,

filter-less, high efficiency Class-D audio power

amplifier with automatic gain control.

The IS31AP2145A integrates AGC (Automatic Gain

Control) function to automatically prevent distortion of

the audio signal by which we can enhance audio

quality and also protect the speaker from damage at

high power levels. The AGC function and its attack

time/release time are selectable via the CTRL pin. The

IS31AP2145A also provides thermal and over current

protection functions.

In addition to these features, 90% high efficiency,

improved RF-rectification immunity, a fast start-up time

and small package size make IS31AP2145A ideal

choice for cellular handsets, PDAs and other portable

applications.

IS31AP2145A is available in a 1.5mm×1.5mm

UTQFN-9 package.

FEATURES

 Filter-less Class-D architecture

 AGC enable/disable function

 2.9W into 4 at 5.0V (10% THD+N)

 Power supply range: 2.7V to 5.5V

 Selectable attack and release times

 Minimum external components

 High efficiency: 90%

 Click-and-pop suppression

 Low shutdown current: 0.1A

 Short-circuit and thermal protection

 Space-saving UTQFN-9, 1.5mm × 1.5mm

APPLICATIONS

 Wireless or cellular handsets and PDAs

 Portable navigation devices

 Portable DVD player

 Notebook PC

 Educational toys

 USB speakers

 Portable gaming

TYPICAL APPLICATION CIRCUIT

OUT+

GND

IS31AP2145A

VDD

OUT-

1 F

IN+

IN-

VREF

CIN

33nF

CTRL

Differential In

Battery

0.1 F

1 F

B1,B3

0.1 F

CTRL1

CTRL2

Figure 1 Typical Application Circuit (Differential Input)

IS31AP2145A

Integrated Silicon Solution, Inc. – www.issi.com 2

Rev.A, 11/20/2011

Figure 2 Typical Application Circuit (Single-Ended Input)

IS31AP2145A

Integrated Silicon Solution, Inc. – www.issi.com 3

Rev.A, 11/20/2011

PIN CONFIGURATION

Package Pin Configuration (Top View)

UTQFN-9

PIN DESCRIPTION

No. Pin Description

A1 IN+ Positive input terminal.

A2 VDD Power supply.

A3 OUT+ Positive output terminal.

B1, B3 GND Ground.

B2 VREF Analog reference power supply terminal.

C1 IN- Negative input terminal.

C2 CTRL Power down and AGC control terminal.

C3 OUT- Negative output terminal.

timewithoutnotice.ISSIassumesnoliabilityarisingoutoftheapplicationoruseofanyinformation,productsorservicesdescribedherein.Customersare

advisedto

obtainthelatestversionofthisdevicespecificationbeforerelyingonanypublishedinformationandbeforeplacingordersforproducts.

IntegratedSiliconSolution,Inc.doesnotrecommendtheuseofanyofitsproductsinlifesupportapplicationswherethefailureormalfunctionofthe

productcanreasonablybeexpected

tocausefailureofthelifesupportsystemortosignificantlyaffectitssafetyoreffectiveness.Productsarenot

authorizedforuseinsuchapplicationsunlessIntegratedSiliconSolution,Inc.receiveswrittenassurancetoitssatisfaction,that:

a.)theriskofinjuryordamagehasbeenminimized;

b.)theuserassume

allsuchrisks;and

c.)potentialliabilityofIntegratedSiliconSolution,Incisadequatelyprotectedunderthecircumstances

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IS31AP2145A-UTLS2-TR

Mfr. #:

Buy IS31AP2145A-UTLS2-TR

Manufacturer:

ISSI

Description:

Audio Amplifiers 2.9W Audio Amp w/ Built-in AGC

Lifecycle:

New from this manufacturer.

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