TPS9104

D Complete Power-Supply/Audio System For Cellular Handsets D Three Low-Dropout Regulators (LDOs) with 100-mV Dropout D Speaker and Ringer Power Amplifiers Drive 32-Ω Dynamic Speakers or Piezo Devices D Low-Noise Microphone Amplifier D Depop Protection For All Amplifiers D Less Than 1 µA Supply Current in Shutdown, Typical D 250-ms Microprocessor Reset Output D 10-mA Charge-Pump Driver Configurable For Inverted or Doubled Output D Separate Enables for LDOs, Amplifiers, and Charge Pump D 1.185-V Reference Capable of Driving 2 mA D 48-Pin TQFP Package TPS9104 CELLULAR SUBSCRIBER TERMINAL POWER SUPPLY/AUDIO SYSTEM SLVS133A – AUGUST 1996 – REVISED APRIL 1998 PT PACKAGE (TOP VIEW) ON SPKR_EN CL VL NC SPKR_IN SPKR_OUT– NC VCC SPKR_OUT+ VB CB GND VCC PL RNGR_OUT+ RNGR_OUT– RNGR_IN RNGR_EN RESET NC AREF VCP GND_CP 48 47 46 45 44 43 42 41 40 39 38 37 1 36 2 35 3 34 4 33 5 32 6 31 7 30 8 29 9 28 10 27 11 26 12 25 13 14 15 16 17 18 19 20 21 22 23 24 GND EN_B PB OFF ON VCC NC EN PA MIC_EN EN_A GND CP EN_CP GND ON_REM NC MIC_OUT MIC_IN– NC MIC_IN+ REF VA CA description NC – No internal connection The TPS9104 incorporates a complete power supply and audio power system for a cellular subscriber terminal that uses battery packs with three or four NiMH/NiCd cells or a single lithium-ion cell. The device includes three low-dropout linear regulators rated for 3.3 V or 3 V at 100 mA each, a charge-pump driver, two power amplifiers for a speaker and a ringer, a low-noise microphone amplifie...