Overview
The TPS70445PWPR is a dual-output, low-dropout voltage regulator from Texas Instruments. This device is part of the TPS704xx family, which is designed for split-voltage systems and features integrated System Voltage Supervisor (SVS) functions, including power-on reset (POR) and power good (PG) indicators. The TPS70445PWPR is capable of supplying 1 A and 2 A from its two regulators, respectively, and offers very low dropout voltage, low noise output, and fast transient response.
The device is available in a PWP (PowerPAD) package and is suitable for applications requiring high accuracy and low quiescent current. It supports a range of fixed and adjustable output voltages, making it versatile for various power management needs.
Key Specifications
| Parameter | Min | |||
|---|---|---|---|---|
| Input Voltage Range (VIN1, VIN2) | -0.3 | - | 7 | V |
| Output Voltage Range (VOUT1, VSENSE1) | - | - | 5.5 | V |
| Output Voltage Range (VOUT2, VSENSE2) | - | - | 5.5 | V |
| Output Current (Regulator 1) | 0 | - | 1 | A |
| Output Current (Regulator 2) | 0 | - | 2 | A |
| Dropout Voltage (Regulator 1) | - | 160 mV | - | mV |
| Operating Junction Temperature Range | -40 | - | 150 | °C |
| Storage Temperature Range | -65 | - | 150 | °C |
| ESD Rating, HBM | - | - | 2 kV | - |
Key Features
- Dual-output voltage regulators with fixed and adjustable voltage options (e.g., 3.3 V/2.5 V, 3.3 V/1.8 V, etc.)
- Low dropout voltage (typically 160 mV on Regulator 1)
- Low quiescent current, independent of output loading
- Fast transient response and stability with small output capacitors (e.g., 47 μF low ESR)
- Integrated SVS (power-on reset, POR) and power good (PG1, PG2) functions
- Independent enable functions for each regulator (EN1, EN2)
- Sleep mode with low input current (2 mA at TJ = +25°C)
- Internal discharge transistors to discharge output capacitors when regulators are turned off
- Low noise output performance without additional filter bypass capacitors
Applications
The TPS70445PWPR is suitable for a variety of applications requiring dual regulated output voltages, including:
- Split-voltage systems in industrial and consumer electronics
- Power management in telecommunications and networking equipment
- Automotive systems requiring high reliability and low dropout voltage
- Medical devices needing precise voltage regulation and low noise
- Embedded systems and microcontrollers requiring multiple voltage rails
Q & A
- What is the typical dropout voltage for Regulator 1 in the TPS70445PWPR?
The typical dropout voltage for Regulator 1 is 160 mV.
- What are the output current capabilities of the two regulators in the TPS70445PWPR?
Regulator 1 can support up to 1 A, and Regulator 2 can support up to 2 A.
- What is the operating junction temperature range for the TPS70445PWPR?
The operating junction temperature range is from -40°C to +150°C.
- Does the TPS70445PWPR have integrated power-on reset (POR) and power good (PG) functions?
- How do the enable functions work for each regulator in the TPS70445PWPR?
The EN1 and EN2 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.
- What is the quiescent current characteristic of the TPS70445PWPR?
The quiescent current remains virtually constant and is independent of output loading, with a maximum of 250 μA over the full range of output current and temperature.
- What type of package is the TPS70445PWPR available in?
The TPS70445PWPR is available in a PWP (PowerPAD) package.
- What are the storage temperature range and ESD rating for the TPS70445PWPR?
The storage temperature range is from -65°C to +150°C, and the ESD rating is 2 kV (HBM).
- How does the sleep mode function in the TPS70445PWPR reduce power consumption?
In sleep mode, the input current is reduced to 2 mA at TJ = +25°C, significantly reducing power consumption.
- What is the purpose of the internal discharge transistors in the TPS70445PWPR?
The internal discharge transistors are used to discharge the output capacitors when the regulators are turned off (disabled).
