High Efficiency, Ground-Referenced

Class-G Headphone Amplifier

Data Sheet

SSM2932

Rev. 0

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FEATURES

Ground-referenced Class-G output stage

Very high efficiency for portable applications

1.7 mA typical quiescent current

50 mW per channel into 16 Ω load (with 3.3 V supply)

98 dB signal-to-noise ratio (SNR), A-weighted

90 dB power supply rejection ratio at 217 Hz

2.5 V to 3.6 V supply range

Selectable gain: 0 dB or 6 dB

High-Z output mode for sharing of output jack

1 μA shutdown current

Short-circuit protection

Pop-and-click reduction circuitry

8 kV ESD protection on output terminals

16

-ball, 0.4 mm pitch WLCSP (1.64 mm × 1.64 mm)

−40°C to +85°C operating temperature range

APPLICATIONS

Cell phones

Smartphones/multimedia phones

Digital cameras

Portable media players

Phone accessories

PDAs

GENERAL DESCRIPTION

The SSM2932 is a stereo headphone amplifier capable of

delivering 50 mW of continuous output power per channel

into 16 Ω single-ended loads at the 1% THD + N threshold.

The stereo headphone drivers are high efficiency, true ground-

referenced Class-G technology.

The SSM2932 incorporates a gain control pin that selects a gain

of 0 dB or 6 dB. The ground-referenced output scheme eliminates

the need for large dc blocking capacitors, reducing system cost

and board area. The Class-G amplifier is fine-tuned to maximize

battery life, a critical task in portable applications. The device

maximizes battery life by modulating the amplifier power supply

rail to match the output demand without consuming excessive

supply current, thus reducing power dissipation during typical

audio playback.

The SSM2932 is specified over the industrial temperature range

of −40°C to +85°C. It has output short-circuit protection as well

as ESD protection to 8 kV (human body model). The SSM2932

is available in a 16-ball, 1.64 mm × 1.64 mm wafer level chip

scale package (WLCSP).

FUNCTIONAL BLOCK DIAGRAM

POR

GAIN

POWER

MANAGEMENT

PGA

PGA

POP/

CLICK

CURRENT

LIMIT

SSM2932

OUTL

SGND

OUTR

INL+

INL–

INR+

INR–

PGND

PVDD

Figure 1.