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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