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MAS9142AUA1-T

Power Amplifier Controller (PAC) and 2.8 V, 50 mA LDO Voltage Regulator

Micro Analog Systems Oy 

DA9142.002

4 January, 2002

MAS9142

Power Amplifier Controller (PAC) and

2.8 V, 50 mA LDO Voltage Regulator

DESCRIPTION

• Temperature Compensation of

Sensor Signal

• Bias Current Source for Detector

Diodes

• Applicable for a Wide Range of

Power Amplifiers

• Low Noise LDO Regulator Included

MAS9142 is designed for use in both the GSM900

and DCS1800 systems and particularly with Hitachi

PF08103B power amplifier module. Other PA

modules can be used with the MAS9142, but

external compensation elements may be required to

maintain the stability of the PA control loop.

MAS9142 incorporates the power detector biasing

components, RC-filtering for power ramping signal,

operational amplifier with AC feedback and a low

dropout (LDO) voltage regulator. The regulator has

the output voltage of 2.8 V and the maximum load

current of 50 mA for generating supply voltage for

VCO/Modulator in the radio channel of a mobile

phone. The regulator’s output is short-circuit

protected. Both the PA control loop and LDO voltage

regulator have common thermal (over-temperature)

protection with 10 °C hysteresis.

FEATURES

APPLICATION

• Two functional blocks: Power Amplifier Controller

and LDO Voltage Regulator

• Low current consumption

• Temperature compensated biasing for external

RF power detection Schottky diodes

• Both PAC loop and LDO voltage regulator have

temperature-controlled power-down feature

• LDO voltage regulator with short circuit current

protection

• Excellent ripple rejection in regulator

• Various operating modes provide greater

flexibility

• Dual- and Triple-Band Cellular Phones

• PCMCIA GSM/DCS data communications

• GSM based controller for vehicles

• Other RF power controlling applications

NOT AVAILABLE IN THE USA AND CANADA

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