MAX850ESA+T

The MAX850ESA+T is a low noise, regulated, negative charge pump power supply for GaAsFET bias in 8 pin NSOIC package. This low cost device is ideal for biasing GaAsFETs in cellular telephone transmitter amplifiers. The applied input voltage (VIN) is first inverted to a negative voltage at NEGOUT by a capacitive charge pump. This voltage is then regulated by an internal linear regulator and appears at OUT. The minimum (most negative) output voltage achievable is inverted positive voltage, plus the 1V required by post regulator. It offer both preset (-4.1V) and adjustable (-0.5V to -9V) output voltages. An internal linear regulator reduces output voltage ripple to 2mVp-p. This low noise, inverting power supply is ideal for biasing GaAsFETs in cellular telephone transmitter amplifiers. It is also used in negative regulated power supplies, wireless data loggers, continuously adjustable GaAsFET bias and LCD bias contrast control.

• Input voltage range from 4.5V to 10V
• Operating temperature range from -40°C to +85°C
• Charge pump switching frequency of 100KHz
• Logic level shutdown mode, 1µA maximum over temperature
• Output current is 5mA
• Maximum supply current is 3mA
• Maximum VOUT load regulation is 8mV/mA at VFB = 0V
• Input capacitance of 10pF
• Cell Phones; Continuously Adjustable GaAsFET Bias; LCD-Bias Contrast Control;
• Negative Regulated Power Supplies; Personal Communicators, PDAs; Wireless Data Loggers

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