Texas Instruments Announces Power Supply Controller and New Family of LDO Voltage Regulators, the TPS701XX and the TPS56300February 13, 2000 by Jeff Shepard
Texas Instruments (TI, Dallas) recently announced a dual-output, power supply controller and a family of dual-output, low-dropout (LDO) voltage regulators, the TPS701XX and the TPS56300. The devices are designed to coordinate the power-up and power-down sequencing of the core and I/O supply voltages. This is designed to further improve overall system integrity and reliability in low-voltage, dual-supply digital systems, such as digital signal processors (DSPs), field programmable gate arrays (FPGAs) and microcontrollers.
The TPS701XX sequencing control is pin programmable so that either output can be selected to be powered-up first with the other output being delayed until the first output reaches regulation. The TPS701XX regulators provide a 3.3V output for powering the processor's I/O, plus a selection of output voltage levels ranging from 1.2V to 5.5V for powering the processor core. The 3.3V output delivers 500mA of current to support system requirements, while the lower-voltage output delivers 250mA of current to the low-power core. The TPS701XX also has an ultra-low quiescent current of 190mA during typical operation and 3uA during standby.
The TPS56300 is designed to address 5V and 3.3V input systems, with the ability to accept an input voltage range from 2.8V to 5.5V. The topology of each output channel has been configured specifically for supplying power to the core or I/O circuitry. One output channel operates as an LDO regulator, using an external n-channel MOSFET and is suitable for powering I/O circuitry when the output voltage is less than the input voltage. The other output channel uses a switching regulator for powering the core. By integrating a high-performance switching regulator, the TSP56300 is designed to provide tight regulation with a 1.5 percent cumulative accuracy. The device also has internal MOSFET drivers on chip that enable power supply systems with high-output currents of greater than 30A.
The TPS56300 comes in a 28-pin PowerPAD TSSOP. In quantities of 1,000, the suggested retail price is $4.05 each. The TPS701XX comes in a 20-pin PowerPAD TSSOP, and in quantities of 1,000, the suggested retail price is $2.47 each. Both are currently available.