3 W filter-free class-D audio power amplifier

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  • The A21SP16 is a differential class-D BTL power amplifier. It is able to drive up to 2.3 W into a 4 Ω load and 1.4 W into a 8 Ω load at 5 V. It achieves outstanding efficiency (88% typ.) compared to classical Class-AB audio amps.

    The gain of the device can be controlled via two external gain-setting resistors. Pop & click reduction circuitry provides low on/off switch noise while allowing the device to start within 5 ms. A standby function (active low) allows the reduction of current consumption to 10 nA typ.

    Key Features

    • Operating from VCC = 2.4 V to 5.5 V
    • Standby mode active low
    • Output power: 3 W into 4 Ω and 1.75 W into 8 Ω with 10% THD+N max and 5 V power supply
    • Output power: 2.3 W @ 5 V or 0.75 W @ 3 V into 4 Ω with 1% THD+N max
    • Output power: 1.4 W @ 5 V or 0.45 W @ 3 V into 8 Ω with 1% THD+N max
    • Adjustable gain via external resistors
    • Low current consumption 2 mA @ 3 V
    • Efficiency: 88% typ.
    • Signal to noise ratio: 85 dB typ.
    • PSRR: 63 dB typ. @ 217 Hz with 6 dB gain
    • PWM base frequency: 250 kHz
    • Low pop & click noise
    • Thermal shutdown protection
    • Available in flip-chip 9 x 300 μm (Pb-free)

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Part Number
Package
Packing Type
Temperature (°C) Marketing Status
Budgetary Price (US$)*
Quantity
ECCN (US)
More info
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min
max
A21SP16J Chip Scale Package 0.5mm pitch Tape And Reel - -
Active
0.4 1000 EAR99
MORE INFO

Country of Origin:

-

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Distributor availability ofA21SP16J

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4835 1 Order Now
RS COMPONENTS EUROPE 4970 1 Order Now
ARROW EUROPE 10000 0 Order Now
Farnell Element14 EUROPE 4065 1 Order Now

Distributor reported inventory date: 2019-10-02

Distributor Name

DIGIKEY

Stock

4835

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

4970

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

10000

Min.Order

0

Region

EUROPE Order Now

Farnell Element14

Stock

4065

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-10-02

Get sample

A21SP16J

Package

Chip Scale Package 0.5mm pitch

Packing Type

Tape And Reel

Unit Price (US$)

0.4*

Distributor availability ofA21SP16J

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4835 1 Order Now
RS COMPONENTS EUROPE 4970 1 Order Now
ARROW EUROPE 10000 0 Order Now
Farnell Element14 EUROPE 4065 1 Order Now

Distributor reported inventory date: 2019-10-02

Distributor Name

DIGIKEY

Stock

4835

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

4970

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

10000

Min.Order

0

Region

EUROPE Order Now

Farnell Element14

Stock

4065

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-10-02

Operating Temperature (°C)

(min)

-

(max)

-

Marketing Status

Active

Unit Price (US$)

0.4

Quantity

1000

ECCN (US)

EAR99

Country of Origin

-

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

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Technical Documentation

    • Description Version Size Action
      DS10233
      3 W filter-free class-D audio power amplifier
      1.0
      855.96 KB
      PDF
      DS10233

      3 W filter-free class-D audio power amplifier

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      ST offering in Wearable - Analog and Mixed Signal Portfolio 3.0
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      ST offering in Wearable - Analog and Mixed Signal Portfolio

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      ST’s solutions for mobile devices

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
A21SP16J
Active
Chip Scale Package 0.5mm pitch Industrial Ecopack3

A21SP16J

Package:

Chip Scale Package 0.5mm pitch

Material Declaration**:

PDF XML

Marketing Status

Active

Package

Chip Scale Package 0.5mm pitch

Grade

Industrial

RoHS Compliance Grade

Ecopack3

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.