DS10473 Rev 2

5/25

STPA003

Overview

24

1

Overview

The STPA003 is a complementary quad audio power amplifier. It is available in two different

packages, Flexiwatt25 and Flexiwatt27. It embeds four independent amplifiers working in

class AB, a standby, a mute pin and an offset detector output. In the Flexiwatt27 package

also a high side driver or a clipping detection pin with diagnostics information is present. In

Flexiwatt25, the user can choose to have the offset detector or the high side driver on

pin 25. The amplifier is fully operational down to a battery voltage of 6 V, without producing

pop noise and continuing to play during battery transitions.

The STPA003 can drive 2 ohm loads and has a very high immunity to disturbs without need

of external components or compensation. It is protected against any kind of short or open

circuit, over-voltage and over-temperature.

1.1

Block diagram and application circuit

Figure 1. Block diagram

IN1

0.22

μF

MUTE

ST-BY

IN2

0.22

μF

OUT1+

OUT1-

OD (*)

(**) only in Flexiwatt25

(*) only in Flexiwatt27

OUT2+

OUT2-

PW-GND

IN3

0.22

μF

IN4

0.22

μF

OUT3+

OUT3-

OUT4+

OUT4-

PW-GND

PW-GND

PW-GND

AC-GND

4x0.22μF

47

μF

SVR

TAB

S-GND

Vcc1

Vcc2

0.1μF

2200 μF

HSD / OD (**)

HSD

HSD / CD-DIAG (*)

GAPGPS02229