MAX881REUB+

The MAX881REUB+ is a low noise bias supply with power-OK for GaAsFET power amplifiers in 10 pin µMAX package. This inverting power supply is a charge pump inverter followed by a negative linear regulator. The input voltage range is 2.5V to 5.5V. The output is preset at -2V or can be set using two resistors to any voltage from -0.5V to (-VIN + 0.6V). It can deliver up to 4mA. The internal linear regulator also filters the output to 1mVp-p ripple and noise. The MAX881R includes power-OK (active-low POK) output that signals when negative voltage is within 7.5% of its set point. It protects GaAsFET by not allowing power to be applied to GaAsFET’s drain until it is properly biased. The signal can be routed either to a microcontroller or directly to aswitch at the GaAsFET drain.

• Oscillator frequency of 100KHz
• Operating temperature range from -40°C to 85°C
• Power-OK signal to control GaAsFET drain switch
• 0.05μA logic controlled shutdown current and 500μA supply current
• 1ms start-up and 1mVp-p output ripple
• Operates with one 4.7μF and three 0.22μF capacitors (no inductors needed)
• Output load regulation of 2mV/mA at VIN ≥ 2.7V, IOUT = 0 to 4mA

Applications

Power Management, Portable Devices, Consumer Electronics

Warnings

Market demand for this product has caused an extension in leadtimes. Delivery dates may fluctuate. Product exempt from discounts.

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party