TCM850

EVALUATION KIT AVAILABLE TCM850 TCM851 TCM852 TCM853 1 REGULATED GaAs FET BIAS SUPPLY FEATURES s s s Fixed – 4.1V or Adjustable – 0.5V to – 9V Output at 5mA 4.5V to 10V Input Voltage Range Low Output Voltage Ripple TCM850-852 .............................................. 2mVp-p TCM853 ...................................................... 1mVp-p 100kHz Charge Pump Switching Frequency Optional External Synchronizing Clock Input (TCM852) Logic Level Shutdown Mode ................ 0.5µA Typ. Temperature (TCM850/852/853) Low Cost, 8-Pin SOIC Package GENERAL DESCRIPTION The TCM850/1/2/3 combines an inverting charge pump and a low noise linear regulator in a single small outline package. They are ideal for biasing GaAS FETs in cellular telephone transmitter power amplifiers All four devices accept a range of input voltages from 4.5V to 10.0V and have – 5mA output current capability. The TCM850/1/2 have both preset (– 4.1V) and variable (– 0.5V to –9.0V) output voltages that program with an external resistor divider. The TCM853 output voltage programs with an external positive control voltage. The TCM850/1/3 can be shutdown reducing quiescent current to less than 0.5µA (typ) over temperature, 2µA (typ) for the TCM851. 2 3 4 5 6 7 s s s s ORDERING INFORMATION APPLICATIONS s s s s s Cellular Phones Negative Regulated Power Supplies LCD Bias Contrast Control Adjustable GaAs FET Bias Wireless Data Loggers Part No. TCM850COA TCM850EOA TCM851COA TCM851EOA TCM852COA TCM852EOA TCM85...