Overview
The TPS65321A-Q1 is a highly integrated power management IC from Texas Instruments, designed to meet the demanding requirements of automotive and industrial applications. This device combines a 36-V, 3.2-A DC-DC step-down converter (buck regulator) with a 280-mA low-dropout (LDO) linear regulator. Both regulators are optimized for low quiescent current consumption to prolong battery life, especially during light load conditions.
The buck regulator features adjustable switching frequencies from 100 kHz to 2.5 MHz, allowing for flexibility in component selection and efficiency optimization. It also includes an internal phase-locked loop (PLL) for synchronization with an external system clock. The LDO regulator is designed to track the battery voltage during cold-crank conditions and consumes only about 35 μA in light load.
The device is packaged in a 14-pin HTSSOP with PowerPAD™, enhancing thermal performance. It includes various protection features such as overcurrent, overtemperature, and undervoltage-lockout (UVLO), ensuring robust operation in harsh environments.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Operating Input Voltage (VIN) | 3.6 | - | 36 | V |
| Operating Input Voltage (VIN_LDO) | 3 | - | 36 | V |
| Buck Regulator Output Current | - | - | 3.2 A | A |
| LDO Regulator Output Current | - | - | 280 mA | mA |
| Switching Frequency | 100 kHz | - | 2.5 MHz | kHz/MHz |
| Operating Ambient Temperature | -40 | - | 125 | °C |
| Operating Junction Temperature | -40 | - | 150 | °C |
| Storage Temperature | -55 | - | 165 | °C |
| Dropout Voltage (LDO) | - | - | 450 mV | mV |
| Load Regulation (LDO) | - | - | 35 mV | mV |
Key Features
- Adjustable Switching Frequency: From 100 kHz to 2.5 MHz, allowing for efficiency and size optimization.
- Integrated High-Side MOSFET: With an active-low, open-drain power-good output pin (nRST).
- Low-Dropout Regulator: 280-mA LDO with low-input supply current of 45 μA typical in no-load.
- Pulse-Skip Eco-mode: Reduces switching and gate-drive losses at light load currents.
- Soft Start and Power Sequencing: Minimizes inrush currents and provides power-supply sequencing during power-up.
- Protection Features: Overcurrent, overtemperature, and undervoltage-lockout (UVLO) protection.
- Low-Voltage Tracking: Enables the device to track the input supply during cold-crank conditions.
- Internal Phase-Locked Loop (PLL): Synchronizes the power-switch turn-on to the falling edge of an external system clock.
- Compact Package: 14-pin HTSSOP with PowerPAD™ for enhanced thermal performance.
Applications
- Automotive Infotainment and Cluster: Suitable for powering various components in automotive infotainment systems.
- Advanced Driver Assistance System (ADAS): Supports the power requirements of ADAS systems.
- Automotive Telematics and eCall: Ideal for telematics and emergency call systems in vehicles.
Q & A
- What is the input voltage range for the buck regulator in the TPS65321A-Q1?
The input voltage range for the buck regulator is 3.6 V to 36 V.
- What is the maximum output current of the LDO regulator?
The maximum output current of the LDO regulator is 280 mA.
- What are the key protection features of the TPS65321A-Q1?
The device includes overcurrent, overtemperature, and undervoltage-lockout (UVLO) protection features.
- How does the pulse-skip Eco-mode improve efficiency?
The pulse-skip Eco-mode reduces switching and gate-drive losses at light load currents, improving efficiency.
- What is the purpose of the internal phase-locked loop (PLL) in the TPS65321A-Q1?
The PLL synchronizes the power-switch turn-on to the falling edge of an external system clock.
- What is the typical quiescent current of the LDO regulator in light load?
The typical quiescent current of the LDO regulator in light load is about 35 μA.
- How does the soft start feature work in the TPS65321A-Q1?
The soft start feature minimizes inrush currents and provides power-supply sequencing during power-up by using a small-value capacitor to adjust the soft-start time.
- What is the operating ambient temperature range for the TPS65321A-Q1?
The operating ambient temperature range is -40°C to 125°C.
- What package type is used for the TPS65321A-Q1?
The device is packaged in a 14-pin HTSSOP with PowerPAD™.
- What are some typical applications of the TPS65321A-Q1?
Typical applications include automotive infotainment and cluster, ADAS, and automotive telematics and eCall systems.
