TPS9103

TPS9103 POWER SUPPLY FOR GaAs POWER AMPLIFIERS D Charge Pump Provides Negative Gate Bias for Depletion-Mode GaAs Power Amplifiers D Buffered Clock Output to Drive Additional External Charge Pump D 135-mΩ High-Side Switch Controls Supply Voltage to the GaAs Power Amplifier D Power-Good Circuitry Prevents High-Side Switch Turn-on Until Negative Gate Bias is Present D Charge Pump Can Be Driven From the Internal Oscillator or An External Clock D 10-µA Maximum Standby Current D Low-Profile (1.2-mm Max Height), 20-Pin TSSOP Package GATE_BIAS VCC C1– C1+ BATT_IN BATT_IN BATT_IN PGP PG GND SLVS131A – OCTOBER 1995 – REVISED JULY 1996 PW PACKAGE (TOP VIEW) 1 20 VDD 2 19 CLK 3 18 BCLK 4 17 GND 5 16 BATT_OUT 6 15 BATT_OUT 7 14 BATT_OUT 8 13 SW_EN 9 12 OSC_EN 10 11 EN description The TPS9103 is a highly integrated power supply for depletion-mode GaAs power amplifiers (PA) in cellular handsets and other wireless communications equipment. Functional integration and low-profile packaging combine to minimize circuit-board area and component height requirements. The device includes: a p-channel MOSFET configured as a high-side switch to control the application of power to the PA; a driver for the high-side switch with a logic-compatible input; a charge pump to provide negative gate-bias voltage; and logic to prevent turn-on of the high-side switch until gate bias is present. The high-side switch has a typical on-state resistance of 135 mΩ. The TPS9103 is available in a 20-pin thin shrink s...