The TPS720xx family of dual rail, low-dropout linear regulators (LDOs) offers outstanding ac performance (PSRR, load and line transient response), while consuming a very low quiescent current of 38µA.
The VBIAS rail that powers the control circuit of the LDO draws very low current (on the order of the quiescent current of the LDO) and can be connected to any power supply that is equal to or greater than 1.4V above the output voltage. The main power path is through VIN, which can be a lower voltage than VBIAS; it can be as low as VOUT + VDO, increasing the efficiency of the solution in many power-sensitive applications. For example, VIN can be an output of a high-efficiency, dc-dc step-down regulator.
The TPS720xx supports a novel feature in which the output of the LDO regulates under light loads when the IN pin is left floating. The light-load drive current is sourced from VBIAS under this condition. This feature is particularly useful in power-saving applications where the dc/dc converter connected to the IN pin is disabled but the LDO is still required to regulate the voltage to a light load.
The TPS720xx is stable with ceramic capacitors and uses an advanced BICMOS fabrication process that yields a dropout of 110mV at a 350mA output load. The TPS720xx has the unique feature of providing a monotonic VOUT rise (overshoot limited to 3%) with VIN inrush current limited to 100mA + ILOAD with an output capacitor of2.2µF.
The TPS720xx uses a precision voltage reference and feedback loop to achieve overall accuracy of 2% over load, line, process, and temperature extremes. An ultra-small wafer chip-scale package (WCSP) makes the TPS720xx ideal for handheld applications. The TPS720xx is also available in a SON-8 package. This family of devices is fully specified over the temperature range of TJ = -40°C to +125°C.
350mA High-Performance LDO
Low Quiescent Current: 38µA
Excellent Load Transient Response: ±15mV for ILOAD = 0mA to 350mA in 1µs
Excellent Line Transient Response: ∆VOUT = ±2mV for ∆VBIAS = ±600mV in 1µs ∆VOUT = ±200µV for ∆VIN = ±400mV in 1µs
Low Noise: 48µVRMS (10Hz to 100kHz)
80dB VIN PSRR (10Hz to 10kHz)
70dB VBIAS PSRR (10Hz to 10kHz)
Fast Start-Up Time: 140µs
Built-In Soft-Start with Monotonic VOUT Rise and Startup Current Limited to 100mA + ILOAD
Over-Current and Thermal Protection
Low Dropout: 110mV at ILOAD = 350mA
Stable with 2.2µF OutputCapacitor
Available in 1,33mm x 0,96mm WCSP-5 and 2mm x 2mm SON-6 Packages