TPS77515PWP

Series:	--
Packaging:	Tube
Part Status:	Active
Output Configuration:	Positive
Output Type:	Fixed
Number of Regulators:	1
Voltage - Input (Max):	10V
Voltage - Output (Min/Fixed):	1.5V
Voltage - Output (Max):	--
Voltage Dropout (Max):	--
Current - Output:	500mA
Current - Quiescent (Iq):	125µA
PSRR:	60dB (100Hz)
Control Features:	Enable, Reset
Protection Features:	Over Current, Over Temperature, Reverse Polarity
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	20-PowerTSSOP (0.173", 4.40mm Width)
Supplier Device Package:	20-HTSSOP
Base Part Number:	TPS77515

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Introduction

TPS77515PWP is a low dropout (LDO) regulator with an integrated power switch. This low-power regulator is specially designed for power management in portable applications. It integrates an efficient linear regulator and a power switch, which can lower the total component count in the system.

Application

This regulator is designed for ultimate flexibility and integration. Its essential feature is the presence of an integrated power FET switch, which in certain operating situations allows it to be extremely power efficient, while still providing two distinct functional blocks of a high accuracy linear regulator and a power switch. The end application requires the implementation of two separate voltages, one a steady output that can source or sink up to 1 A of current and the other a varying voltage controlled by an external voltage source. This feature makes it a great choice for a variety of applications, from low-power digital control loops to consumer electronics. Some potential applications for the TPS77515PWP are:• Portable consumer electronics, such as digital cameras, camcorders, cell phones, MP3 players, and more.• Non-critical regulation applications in LCD display driver designs.• Battery powered applications, such as remote control devices, mobile scooters, wearables, and more.• Automotive applications.• Automated test equipment.

Key Specifications

The key specifications of the TPS77515PWP are:• Input voltage range: 2.7 V to 5.5 V• Output voltage range: 3 V to 20 V• Low dropout voltage: 180 mV @ 1 A• Quiescent current: 10 μA (typical)• Setup current: 2 mA (typical)• Open loop output regulation: ±3%• Output current: 1 A• Over-temperature protection: 135° C• Sleep current mode: 0.1 μA (typical)• Shutdown current: 0.1 μA (typical)• Ripple rejection: ≥50 dB

Working Principle of TPS77515PWP

The TPS77515PWP is a low dropout linear regulator with an integrated power switch. The regulator has two main components: an error amplifier, which compares the feedback voltage to the reference voltage and generates the error signal, and a regulator, which powers the load by converting the output voltage to the desired level. This is accomplished by controlling the operation of the integrated power FET switch.A voltage reference is used as a comparison to the feedback voltage of the output. This reference voltage is set by connecting a resistor divider across the input voltage source. When the voltage at the output drops or rises, the error amplifier compares it to the reference voltage and produces an error signal accordingly.The error signal adjusts the gate voltage of the FET switch, which is located between the power supply and the regulator output. This adjusts the amount of current supplied to the regulator. When the output voltage exceeds the reference voltage, the error amplifier reduces the gate voltage of the FET, decreasing the current flow to the regulator. When the voltage on the regulator output is below the reference voltage, the FET switch is turned on fully, supplying the regulator with more current to bring the output voltage to the desired level.

Conclusion

The TPS77515PWP is an ideal low power solution for a variety of applications. With its integrated power FET switch, it can be extremely power efficient, while providing two distinct functional blocks of a high accuracy linear regulator and a power switch. Its wide input voltage range and low dropout enable it to be deployed in a number of designs. From portable electronics to automotive applications, the TPS77515PWP can be employed for a range of designs.

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