Overview
The TPS70345PWP from Texas Instruments is a dual-output low-dropout voltage regulator designed to provide a complete power management solution for various applications, including Texas Instruments DSP, processor power, ASIC, FPGA, and digital systems. This device is particularly suited for applications requiring dual output voltage regulators with power sequencing capabilities. It offers high-performance features such as fast transient response, high accuracy, and low quiescent current, making it ideal for DSP applications with specific power sequencing requirements.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage (VIN1, VIN2) | 2.7 | - | 6 | V |
| Output Current (Regulator 1) | 0 | - | 1 A | A |
| Output Current (Regulator 2) | 0 | - | 2 A | A |
| Output Voltage Options | 3.3 V/2.5 V, 3.3 V/1.8 V, 3.3 V/1.5 V, 3.3 V/1.2 V, Dual Adjustable | - | - | V |
| Quiescent Current | - | 185 mA | - | mA |
| Standby Current | - | 2 mA | - | mA |
| Thermal Shutdown Junction Temperature | - | - | 150 | °C |
| Power Supply Rejection Ratio (PSRR) | 60 | - | 65 | dB |
| Accuracy Over Load and Temperature | - | - | 2% | % |
| Package Type | - | - | 24-Pin PowerPAD TSSOP | - |
Key Features
- Dual Output Voltages for Split-Supply Applications
- Independent Enable Functions
- Fast Transient Response
- Voltage Options: 3.3 V/2.5 V, 3.3 V/1.8 V, 3.3 V/1.5 V, 3.3 V/1.2 V, and Dual Adjustable Outputs
- Open Drain Power-On Reset with 120 ms Delay
- Open Drain Power Good for Regulator 1
- Ultralow Quiescent Current (185 mA typical)
- Low Noise: 78 μVRMS Without Bypass Capacitor
- Quick Output Capacitor Discharge Feature
- Two Manual Reset Inputs
- 2% Accuracy Over Load and Temperature
- Undervoltage Lockout (UVLO) Feature
- Thermal Shutdown Protection
Applications
The TPS70345PWP is designed for various high-performance applications, including:
- Texas Instruments DSP power management
- Processor power management
- ASIC and FPGA power management
- Digital systems requiring dual output voltage regulators
- Systems needing power sequencing and high accuracy voltage regulation
Q & A
- What is the primary application of the TPS70345PWP?
The TPS70345PWP is primarily designed for Texas Instruments DSP, processor power, ASIC, FPGA, and digital applications requiring dual output voltage regulators with power sequencing capabilities.
- What are the output current capabilities of the TPS70345PWP?
The device can provide up to 1 A on Regulator 1 and up to 2 A on Regulator 2.
- What are the available output voltage options for the TPS70345PWP?
The device offers several output voltage options including 3.3 V/2.5 V, 3.3 V/1.8 V, 3.3 V/1.5 V, 3.3 V/1.2 V, and dual adjustable outputs.
- How does the power sequencing work on the TPS70345PWP?
The power sequencing can be programmed using the SEQ terminal. When the SEQ terminal is pulled high or left open, VOUT2 turns on first and VOUT1 turns on after VOUT2 reaches approximately 83% of its regulated output voltage. Pulling the SEQ terminal low reverses the power-up order.
- What is the quiescent current of the TPS70345PWP?
The device has an ultralow quiescent current of 185 mA typical.
- Does the TPS70345PWP have thermal protection?
Yes, the device features thermal shutdown protection with a junction temperature limit of 150°C.
- What is the package type of the TPS70345PWP?
The device is packaged in a 24-Pin PowerPAD TSSOP package.
- How does the RESET function work on the TPS70345PWP?
The RESET function is an active low, open drain output that requires a pull-up resistor. It goes to a high impedance state after a 120 ms delay when VIN1 is above the undervoltage condition, the manual reset (MR) pin is in a high impedance state, and VOUT2 is above approximately 95% of its regulated voltage.
- What is the power supply rejection ratio (PSRR) of the TPS70345PWP?
The PSRR is 60 dB to 65 dB depending on the frequency and output conditions.
- Does the TPS70345PWP have any noise reduction features?
Yes, the device has low noise output performance with 78 μVRMS without the need for bypass capacitors.
