GENERAL DESCRIPTION
The ft690V/M is a mono Class-AB audio power
amplifier designed for demanding applications in
mobile phones and other portable media devices. It
is capable of delivering 1.0W of continuous output
power to an 8Ω BTL load with less than 1% distortion
(THD+N) from a 5VDC power supply.
The ft690V/M is specifically designed to provide high
quality output power with a minimal number of
external components. The ft690W does not require
output coupling capacitors or bootstrap capacitors,
and is therefore ideal for use in mobile phones and
other low voltage applications where minimal power
consumption is a primary requirement.
The ft690V/M features a low-power shutdown mode.
In the shutdown mode where a logic low is applied
onto the SD pin, the amplifier is completely turned off
and no supply current will flow through the device. It
also features advanced pop & click circuitry which
eliminates noise which would otherwise occur during
turn-on and turn-off transitions.
The ft690V/M is unity-gain stable and can be
configured by external gain-setting resistors.
APPLICATIONS
? Mobile phone
? MP3/4 player
? Portable electronic devices
FEATURES
? Output Power
- 1W (8Ω, 5V, 1% THD+N)
- 360mW (8Ω, 3V, 1% THD+N)
? PSRR: 64dB (typical) at 217Hz
? THD+N: 0.05% at 1kHz (5V/8Ω/0.5W)
? Quiescent current: 3.5mA at 8Ω
? Shutdown current: 0.1μA (typical)
? Improved pop & click circuitry eliminates noise
during turn-on and turn-off transitions
? Wide input voltage range: 2.5V ~ 5.5V
? No output coupling capacitors, snubber networks
or bootstrap capacitors required
? Unity-gain stable
? External gain configuration capability
? Available packages: DFN3X3-8L and MSOP-8L
APPLICATION CIRCUIT
Figure 1: Typical Audio Amplifier Application Circuit
DFN3X3-8L MSOP-8

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