EUA5544
Class AB Stereo Headphone Driver
with Shutdown
DESCRIPTION
The EUA5544 is pin compatible with the BH3541/4, and
functionally compatible with the TPA611× series and
LM488
×
series. As the EUA5544 contains advanced
depop circuitry which eliminates pops & clicks during
shutdown-on and shutdown-off, it can reduces a capacitor
and resistor compared to Mute solution of other devices.
The EUA5544 features an advantage of low-power
consumption shutdown mode, activated by driving the
shutdown pin with logic low. And it also allows fast
turn-on with 1µF bypass capacitor (C
B
).
The EUA5544 is an integrated class AB stereo headphone
amplifier capable of delivering 68mW per channel of
continuous average power into a 16
Ω
load or 35mW per
channel into a 32
Ω
load from a 5V power supply. It also
can operate from a 3V supply, capable of delivering 24
mW into a 32
Ω
load.
The EUA5544 further integrates a voltage divider inside
the chip. Thus, the external resistors can be eliminated.
The EUA5544 has a fixed gain of 6dB so that external
gain setting is unnecessary.
FEATURES
No Switch On/Off Clicks
Wide Power Supply Operation 2.5V– 6V
Mute Function Compatibility
High Signal-to-Noise Ratio
Low Distortion
Large Output Voltage Swing
Excellent Power Supply Ripple Rejection
High Crosstalk Immunity＞85dB
Low Quiescent Current
Ultra-low Shutdown Current …0.02µA typical
Short-circuit Protection
Integrated Voltage Divider (V
DD
/2) to Eliminate
External Resistors
Available in SOP-8
RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
Headphone Amplifier for CD-ROMs
Portable Audio Equipment
Typical Application Circuit
DS5544 Ver 2.4 Oct.2007
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
