Overview
The TPS70251PWPRG4 is a dual-output, low-dropout voltage regulator produced by Texas Instruments. This device is part of the TPS702xx family, which is designed to provide a complete power solution for split-voltage systems. It features integrated supervisory voltage (SVS) functions, including power-on reset (POR) and power good (PG) indicators. The regulator is capable of supplying 500mA and 250mA from its two independent outputs, making it suitable for a variety of applications requiring multiple voltage levels.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage Range (VIN1, VIN2) | -0.3 | - | 7 | V |
| Output Current (Regulator 1) | 0 | - | 500 | mA |
| Output Current (Regulator 2) | 0 | - | 250 | mA |
| Output Voltage Range (Fixed Options) | 1.22 | - | 5.5 | V |
| Quiescent Current | - | 190 | - | μA |
| Standby Current | - | 2 | - | μA |
| Dropout Voltage (Regulator 1) | - | 170 | 275 | mV |
| UVLO Threshold | 2.4 | - | 2.65 | V |
| Operating Junction Temperature | -40 | - | 125 | °C |
Key Features
- Dual output voltages for split-supply systems, with options such as 3.3V/2.5V, 3.3V/1.8V, 3.3V/1.5V, and 3.3V/1.2V.
- Independent enable functions for each regulator.
- Fast transient response and low noise (65μVRMS without bypass capacitor).
- Open drain power-on reset with a 120ms delay and open drain power good outputs for both regulators.
- Ultralow quiescent current of 190μA (typ) and 1μA input current during standby.
- Quick output capacitor discharge feature and manual reset input.
- 2% accuracy over load and temperature.
- Undervoltage lockout (UVLO) feature.
- 20-Pin PowerPAD™ TSSOP package.
Applications
The TPS70251PWPRG4 is suitable for various applications requiring multiple voltage levels, such as:
- Split-voltage systems in industrial and automotive electronics.
- Power supply systems in telecommunications and networking equipment.
- Embedded systems and microcontrollers requiring multiple voltage rails.
- Medical devices and diagnostic equipment with stringent power requirements.
Q & A
- What is the maximum output current for Regulator 1 and Regulator 2?
Regulator 1 can supply up to 500mA, while Regulator 2 can supply up to 250mA.
- What are the available output voltage options for the TPS70251?
The device offers fixed output voltage options such as 3.3V/2.5V, 3.3V/1.8V, 3.3V/1.5V, and 3.3V/1.2V.
- What is the quiescent current of the TPS70251?
The quiescent current is typically 190μA at full load.
- Does the TPS70251 have power-on reset and power good features?
Yes, it features an open drain power-on reset with a 120ms delay and open drain power good outputs for both regulators.
- How does the manual reset input work?
The manual reset input (MR) is active low and can be connected to the PG1 or PG2 output pins to monitor the output voltages. It has a 6μA pull-up current to VIN1.
- What is the operating junction temperature range of the TPS70251?
The operating junction temperature range is from -40°C to +125°C.
- What is the dropout voltage for Regulator 1?
The dropout voltage for Regulator 1 is typically 170mV and can go up to 275mV.
- Does the TPS70251 have an undervoltage lockout feature?
Yes, it has an undervoltage lockout (UVLO) feature that prevents the internal regulators from turning on until VIN1 reaches 2.5V.
- What is the package type of the TPS70251?
The device is available in a 20-Pin PowerPAD™ TSSOP package.
- How does the enable function work for each regulator?
The EN terminals are inputs that enable or shut down each respective regulator. Applying a high signal to EN1 or EN2 shuts down the corresponding regulator, and applying a high signal to both EN1 and EN2 puts both regulators into sleep mode.
