General Description：
The EMA1901 is an audio power amplifier primarily designed for portable communication applications such as mobile phones and portable multimedia players (PMP). To an 8? BTL load, it can deliver 1.25 watt of continuous average power with less than 1% distortion (THD+N) from a 5VDC supply. Typical THD+N is about 0.015% at 1Watt.
The EMA1901 is pin-compatible to National Semi’s LM4890 Micro-SMD package with a superior (THD+N). It does not require output coupling capacitors or bootstrap capacitors, and is ideal for mobile phone and other low voltage applications where minimal power consumption is a primary requirement.
The EMA1901 features a low-power consumption shutdown mode, and an internal thermal shutdown protection mechanism. Advanced pop & click circuitry is built in to eliminate noises that would otherwise occur during turn-on and turn-off transitions. The EMA1901 is unity-gain stable and can be configured by external gain-setting resistors.
EMP products are Pb-free and RoHS compliant.

Key Specifications：
PSRR at 217Hz, VDD = 5V (Fig. 1) 60dB(typ.)
Power Output at 5.0V & 1% THD 1.25W(typ.)
Power Output at 2.6V & 1% THD 300mW(typ.)
Shutdown Current < 1μA(typ.)

Features：
Available in space-saving WL-CSP package
Ultra low current shutdown mode
BTL output driving capacitive loads
Improved pop & click circuitry eliminating noises during turn-on and turn-off transitions
2.5 - 5.5V operation
No output coupling capacitors, snubber networks or bootstrap capacitors required
Thermal shutdown protection
Unity-gain stable
External gain configuration capability

Applications：
Mobile Phones
PDAs and PMPs
Portable Electronic Device

Elite MicroPower Inc. reserves the right to make changes to improve reliability or manufacturability without notice, and customers are advised to obtain the latest version of relevant information prior to placing orders.

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