TPS9104 Datasheet | Texas Instruments

description - No internal connection The TPS9104 incorporates a plete power supply and audio power system for a cellular subscriber terminal that uses battery packs with three or four Ni MH/Ni Cd 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 m A each, a charge-pump driver, two power amplifiers for a speaker and a ringer, a low-noise microphone amplifier, and logic that includes a 250-ms reset, on/off control, and processor interface. Regulators A and B and the charge-pump driver are disabled until regulator L (logic regulator) reaches the rated voltage and RESET is logic high. Regulators A and B, the charge-pump driver, and the amplifiers have separate enables allowing circuitry to be powered up or down as necessary to conserve battery power. Each of the amplifiers has a depop circuit to prevent objectionable noise when the IC is powered up or when the amplifiers are enabled. Both the speaker amplifier and the ringer amplifier are designed to supply 2 V peak-to-peak into 32 Ω or into a 90-n F piezoelectric speaker. The microphone amplifier is a low-noise high-gain (AV=100) circuit capable of supplying 3 V peak-to-peak into a 10-kΩ load. The TPS9104 operates over a free-air temperature range of - 40°C to 85°C and is supplied in a 48-pin TQFP package. AVAILABLE OPTIONS PACKAGED DEVICE CHIP FORM TA THIN QFP (Y) (PT) - 40°C to 85°C TPS9104IPT TPS9104Y The PT package is available taped and reeled. Add R suffix to the device type when ordering (e.g. TPS9104IPTR). Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments...