TCM851

`  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 ................ 0.5mA Typ.
   Temperature (TCM850/852/853)
`  Low Cost, 8-Pin SOIC Package

Supply Voltage (V_IN to GND) .................................. 0.3V to +10.5V
VNEGOUT to GND ...................................................... 10.5V to 0.3V
V_IN to V_NEGOUT ............................................................... 0.3 to 21V
V_OUT to GND** ....................................................... V_NEGOUT to 0.3V
SHDN or OSC (Pin 4) to GND .......................... 0.3V to (VIN + 0.3V)
Power Dissipation (T_A < 70)
SOIC ......................................................................................470mW
Operating Temperature Range
C Device .......................................................................... 0 to 70
E Device ................................................................... 40 to +85
Storage Temperature Range .................................. 65 to +165
Lead Temperature (Soldering, 10 sec) ................................... +300

*This is a stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability.

**The output may be shorted to NEGOUT or GND if the package power dissipation is not exceeded. Typical short circuit current to GND is 50mA.

The TCM851 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 TCM851 can be shutdown reducing quiescent current to less than 0.5mA (typ) over temperature, 2mA (typ) for the TCM851.