Features: `Open Drain Power-On Reset With 220-ms Delay
`250-mA Low-Dropout Voltage Regulator
`Available in 1.8-V, 2.5-V, 3-V, Fixed Output and Adjustable Versions
`Dropout Voltage Typically 200 mV at 250 mA (TPS77930)
`Ultra Low 92-A Quiescent Current (Typ)
`8-Pin MSOP (DGK) Package
`Low Noise (55 Vrms) With No Bypass Capacitor (TPS77918)
`2% Tolerance Over Specified Conditions For Fixed-Output Versions
`Fast Transient Response
`Thermal Shutdown Protection
`See the TPS773xx and TPS774xx Family of Devices for Active Low EnablePinout
SpecificationsInput voltage range‡, VI . . . . . . . . . . . . . . . . . . . . . .. . . . . . 0.3 V to 13.5 V
Voltage range at EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to 16.5 V
Maximum RESET voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.5 V
Peak output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... Internally limited
Continuous total power dissipation . . . . . . . . . . See Dissipation Rating Table
Output voltage, VO (OUT, FB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 5.5 V
Operating virtual junction temperature range, TJ . . . . . . . 40°C to 125°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
ESD rating, HBM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV
† 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.
‡ All voltage values are with respect to network terminal ground.DescriptionThe TPS77918 is a low dropout regulator with integrated power-on reset. The device is capable of supplying 250 mA of output current with a dropout of 200 mV (TPS77930). Quiescent current of TPS77918 is 92 A at full load dropping down to 1 A when the device is disabled. The device is optimized to be stable with a wide range of output capacitors including low ESR ceramic (10 F) or low capacitance (1 F) tantalum capacitors. The TPS77918 has extremely low noise output performance (55 Vrms) without using any added filter capacitors. TPS77918 is designed to have a fast transient response for larger load current changes.
The TPS77918 is offered in 1.8-V, 2.5-V, and 3-V fixed-voltage versions and in an adjustable version (programmable over the range of 1.5 V to 5.5 V). Output voltage tolerance is 2% over line, load, and temperature ranges. The TPS779xx family is available in 8-pin MSOP (DGK) packages.
Because the PMOS device TPS77918 behaves as a low-value resistor, the dropout voltage is very low (typically 200 mV at an output current of 250 mA for 3.3 volt option) and is directly proportional to the output current. Additionally, since the PMOS pass element is a voltage-driven device, the quiescent current of TPS77918 is very low and independent of output loading (typically 92 A over the full range of output current, 0 mA to 250 mA). These two key specifications of TPS77918 yield a significant improvement in operating life for battery-powered systems.
The TPS77918 is enabled when the EN pin is connected to a high-level input voltage. This LDO family also features a sleep mode; applying a TTL low signal to EN (enable) shuts down the regulator, reducing the quiescent current to less than 1 A at TJ = 25°C.
The TTPS77918 features an integrated power-on reset, commonly used as a supply voltage supervisor (SVS), or reset output voltage. The RESET output of the TPS77918 initiates a reset in DSP, microcomputer or microprocessor systems at power-up and in the event of an undervoltage condition. An internal comparator in the TPS779xx monitors the output voltage of the regulator to detect an undervoltage condition on the regulated output voltage. When OUT reaches 95% of its regulated voltage, RESET will go to a high-impedance state after a 220 ms delay. RESET of TPS77918 will go to low-impedance state when OUT is pulled below 95% (i.e. over load condition) of its regulated voltage.
TPS77918 Data Sheet
