TPS54900

` Four Independent 100-mA Channels Programmable Over 4-Wire Serial Port
` Converter Regulation Range: 7.5 V to 13.1 V in 400-mV Steps, Plus Unregulated Pass-Through Mode to Shunt VIN to any Output
` Internally Compensated PWM Controller and Integrated PMOS Power Switches
` Global and Per Channel Status Available Through Serial Port
` External Synchronization of PWM With System Clock
` Per Channel Current Limit and Global Thermal Shutdown
` 40 to 85 Ambient Temperature Range

absolute maximum ratings over operating free-air temperature (unless otherwise noted)†
Supply voltage range‡, V_IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  0.3 V to 18 V
Input voltage range‡, EN, CBS, FB0, FB1, FB2, FB3 . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to V_IN + 0.3 V
Input voltage range‡, SCLK, SDI, SFS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  0.3 V to 5 V
Output voltage range‡, LX0, LX1, LX2, LX3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to V_IN + 0.3 V
Output voltage range‡, SDO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  0.3 V to 5 V
Continuous power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating junction temperature, T_J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 to 125
Storage temperature range, T_stg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  55 to 150
Lead soldering temperature, 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  300

† Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

The TPS54900 four-channel step-down converter uses voltage mode PWM control to provide four independently programmable output voltages. Each regulated channel includes a high-side PMOSFET TPS54900 switch with a typical rDS(ON) of 0.8 , which makes it suitable for high efficiency, low current applications.

Commands sent to the TPS54900 over the four-wire serial port programs the outputs independently or globally to supply voltages from 7.5 V to 13.1 V in 0.4-V increments. When the input voltage is desired at an output, a bypass mode can be activated which fully enhances the PMOSFET TPS54900 switch and disables the switching circuitry of the selected channel.

The TPS54900 is an ideal companion device to power THS7102 ADSL