Overview
The TPS70145PWP is a dual-output low-dropout (LDO) voltage regulator produced by Texas Instruments. This device is designed to provide a complete power management solution for split-voltage applications, particularly in DSP (Digital Signal Processing) systems, processors, ASICs, FPGAs, and other digital applications. It features dual output voltages with selectable power-up sequencing, making it ideal for applications requiring precise voltage control and sequencing.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | HTSSOP (PWP) | - |
| Pins | 20 | - |
| Operating Temperature Range | -40 to 125 | °C |
| Input Voltage Range | 2.7 to 6 | V |
| Output Voltage Options | Fixed: 1.2V, 1.5V, 1.8V, 2.5V, 3.3V; Adjustable | V |
| Output Current (Regulator 1) | Up to 500mA | mA |
| Output Current (Regulator 2) | Up to 250mA | mA |
| Quiescent Current (Typical) | 190µA | µA |
| Dropout Voltage (Typical) | 170mV | mV |
| Power Supply Rejection Ratio (PSRR) @ 100kHz | 20dB | dB |
| Noise (RMS Without Bypass Capacitor) | 65µV | µV |
| Accuracy Over Load and Temperature | 2% | % |
| Thermal Resistance (θJA) | 74°C/W | °C/W |
Key Features
- Dual output voltages with selectable power-up sequencing for DSP applications.
- Low dropout voltage (typically 170mV on regulator 1) and ultra-low quiescent current (190µA typical).
- Fast transient response and stable operation with 10µF low ESR capacitors.
- Open drain power-on reset (RESET) with a 120ms delay and open drain power good (PG1) for regulator 1.
- Manual reset inputs (MR1 and MR2) for triggering reset conditions.
- Undervoltage lockout (UVLO) feature to prevent regulators from turning on until VIN1 reaches 2.5V.
- Quick output capacitor discharge feature when the regulator is turned off.
- Low noise output performance (65µV RMS without bypass capacitor).
- Thermal shutdown protection.
Applications
The TPS70145PWP is designed for use in various digital applications, including:
- DSP (Digital Signal Processing) systems.
- Processors and ASICs (Application-Specific Integrated Circuits).
- FPGAs (Field-Programmable Gate Arrays).
- Other digital applications requiring dual output voltage regulators with precise sequencing.
Q & A
- What is the typical dropout voltage of the TPS70145PWP?
The typical dropout voltage is 170mV on regulator 1.
- What are the output current capabilities of the regulators?
Regulator 1 can support up to 500mA, and regulator 2 can support up to 250mA.
- What is the quiescent current of the TPS70145PWP?
The quiescent current is typically 190µA.
- What are the available output voltage options for the TPS70145PWP?
The device offers fixed output options of 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V, as well as adjustable output options.
- How does the power-up sequencing work on the TPS70145PWP?
The power-up sequencing can be controlled via the SEQ pin, allowing either VOUT1 or VOUT2 to power up first.
- What is the purpose of the RESET and PG1 pins?
The RESET pin provides a power-on reset signal, and the PG1 pin indicates the status of the VOUT1 regulator.
- What is the thermal shutdown protection feature?
The device includes thermal shutdown protection to prevent overheating.
- What is the operating temperature range of the TPS70145PWP?
The operating temperature range is from -40°C to 125°C.
- What is the undervoltage lockout (UVLO) feature?
The UVLO feature prevents the internal regulators from turning on until VIN1 reaches 2.5V.
- How does the manual reset function work?
The manual reset inputs (MR1 and MR2) can trigger a reset condition when pulled to a logic low state.
