TPS65381A-Q1 - Multi-Rail PMIC for Safety MCUs | TI
MPN: TPS65381A-Q1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.75 | $8.75 |
| 10 | $7.92 | $79.20 |
| 100 | $6.84 | $684.00 |
| 500 | $5.98 | $2,990.00 |
| 1,000 | $5.24 | $5,240.00 |
Drop-in alternatives for TPS65381A-Q1 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TPS65381-Q1
β Drop-Inπ Reference alternative (not in catalog)
TPS65381AQDAPRQ1
β Drop-Inπ Reference alternative (not in catalog)
TPS65381AQDAPTQ1
β Drop-Inπ Reference alternative (not in catalog)
TPS6594-Q1
β‘ Same Packageβ In Stock
$8.1 / Unit
View Datasheet βTPS65385A-Q1
β‘ Same Packageπ Reference alternative (not in catalog)
TPS65381A-Q1 Maximum Ratings & Electrical Characteristics
| Number of Outputs | 5 |
| Topology | Buck + 4 LDOs |
| Input Voltage Range | 4.5 V to 40 V |
| Buck Output Current | 1.3 A |
| Output Voltage Range | 3.234 V to 9.5 V |
| Package | 32-HTSSOP (PowerPAD) |
| Operating Temperature Range | -40Β°C to +150Β°C |
| Interface | SPI |
| Functional Safety | ISO 26262 ASIL-D |
| AEC-Q100 | Qualified |
| RoHS | Compliant |
| Mounting Type | Surface Mount |
| Watchdog Timer | Yes |
| Voltage Monitors | Yes |
| Fail-Safe Output | Yes |
TPS65381A-Q1 Pin Configuration
| Pin 1 | VIN β Input voltage supply |
| Pin 2 | VIN β Input voltage supply |
| Pin 3 | BUCK_SW β Buck converter switch node |
| Pin 4 | BUCK_SW β Buck converter switch node |
| Pin 5 | GND β Ground |
| Pin 6 | GND β Ground |
| Pin 7 | LDO1_OUT β LDO1 output |
| Pin 8 | LDO2_OUT β LDO2 output |
| Pin 9 | LDO3_OUT β LDO3 output |
| Pin 10 | LDO4_OUT β LDO4 output |
| Pin 11 | SPI_CLK β SPI clock |
| Pin 12 | SPI_CS β SPI chip select |
| Pin 13 | SPI_MOSI β SPI master out slave in |
| Pin 14 | SPI_MISO β SPI master in slave out |
| Pin 15 | EN β Enable input |
| Pin 16 | FAULT β Fault output |
| Pin 17 | WDOG β Watchdog input |
| Pin 18 | GND β Ground |
| Pin 19 | GND β Ground |
| Pin 20 | BUCK_FB β Buck feedback |
| Pin 21 | LDO1_FB β LDO1 feedback |
| Pin 22 | LDO2_FB β LDO2 feedback |
| Pin 23 | LDO3_FB β LDO3 feedback |
| Pin 24 | LDO4_FB β LDO4 feedback |
| Pin 25 | VCC β Internal supply |
| Pin 26 | VCC β Internal supply |
| Pin 27 | GND β Ground |
| Pin 28 | GND β Ground |
| Pin 29 | NC β No connect |
| Pin 30 | NC β No connect |
| Pin 31 | NC β No connect |
| Pin 32 | NC β No connect |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
TPS65381A-Q1 is suitable for 6 applications: Automotive ECUs, ADAS Systems, Industrial Motor Control, Safety-Critical Industrial Controllers, Battery Management Systems, Medical Devices.
Automotive ECUs
The TPS65381A-Q1 provides multiple regulated rails for automotive electronic control units (ECUs), such as engine control, transmission, and body control modules. Its wide input range (4.5V to 40V) handles load dumps and cold-crank conditions. The integrated buck converter efficiently steps down battery voltage for the MCU core, while LDOs supply low-noise rails for sensors and communication interfaces. The device's AEC-Q100 qualification and ISO 26262 ASIL-D compliance ensure reliable operation in safety-critical automotive systems. Its SPI interface enables real-time diagnostics and monitoring, essential for meeting functional safety requirements.
Recommended
ADAS Systems
Advanced driver-assistance systems (ADAS) require reliable power for sensors, cameras, and radar processors. The TPS65381A-Q1 offers multiple outputs with precise voltage regulation and monitoring, ensuring stable operation of the MCU and peripherals. Its fail-safe output and watchdog timer enhance system safety, meeting ISO 26262 requirements. The device's wide input range accommodates automotive battery fluctuations, while the SPI interface allows for dynamic voltage scaling and fault reporting. The compact 32-HTSSOP package saves PCB space, making it ideal for space-constrained ADAS modules.
Recommended
Industrial Motor Control
In industrial motor control, the TPS65381A-Q1 powers MCUs that manage motor drivers and feedback sensors. Its buck converter provides efficient power for the MCU core, while LDOs supply clean rails for analog-to-digital converters and encoders. The device's robust protection features, including overvoltage and undervoltage monitoring, ensure reliable operation in harsh industrial environments. The SPI interface enables real-time monitoring of power rails, facilitating predictive maintenance. The wide input range supports 24V industrial supplies, and the AEC-Q100 qualification ensures long-term reliability.
Recommended
Safety-Critical Industrial Controllers
The TPS65381A-Q1 is designed for safety-critical industrial controllers, such as programmable logic controllers (PLCs) and safety relays. Its ISO 26262 ASIL-D compliance ensures that power failures are detected and handled safely. The device provides multiple voltage rails with independent monitoring, allowing the MCU to verify power integrity. The watchdog timer and fail-safe output enhance system safety. The wide input range and robust thermal performance make it suitable for industrial environments. The SPI interface allows for configuration and diagnostics, simplifying system integration.
Recommended
Battery Management Systems
In battery management systems (BMS), the TPS65381A-Q1 provides power to the MCU that monitors battery cells and manages charging. Its wide input range (4.5V to 40V) accommodates varying battery voltages, and the multiple outputs power the MCU, communication interfaces, and sensors. The device's safety features, including voltage monitoring and fail-safe output, are crucial for preventing overcharge or overdischarge. The SPI interface enables communication with the MCU for real-time battery status. The AEC-Q100 qualification ensures reliability in automotive BMS applications.
Recommended
Medical Devices
The TPS65381A-Q1 can be used in medical devices that require reliable power for MCUs and sensors. Its low-noise LDO outputs are suitable for sensitive analog circuits, such as those in patient monitoring equipment. The device's safety features, including voltage monitoring and watchdog timer, ensure reliable operation in critical medical applications. The wide input range allows for various power sources, and the compact package is ideal for portable devices. The SPI interface enables configuration and diagnostics, facilitating compliance with medical standards.
Recommended
Recommended Products Summary
Engineering reference data for TPS65381A-Q1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS65381-Q1 | TPS65381AQDAPRQ1 | TPS65381AQDAPTQ1 | TPS6594-Q1 | TPS65385A-Q1 |
|---|---|---|---|---|---|---|
| Package | 32-HTSSOP | 32-HTSSOP | 32-HTSSOP | 32-HTSSOP | 32-HTSSOP | 32-HTSSOP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | 4.5V to 40V | 4.5V to 40V | 4.5V to 40V | 4.5V to 40V | [DATA_NEEDED] | [DATA_NEEDED] |
| Output Voltage Range | 3.234V to 9.5V | 3.234V to 9.5V | 3.234V to 9.5V | 3.234V to 9.5V | [DATA_NEEDED] | [DATA_NEEDED] |
| Buck Output Current | 1.3A | 1.3A | 1.3A | 1.3A | [DATA_NEEDED] | [DATA_NEEDED] |
| Number of Outputs | 5 | 5 | 5 | 5 | [DATA_NEEDED] | [DATA_NEEDED] |
| Functional Safety | ISO 26262 ASIL-D | ISO 26262 ASIL-D | ISO 26262 ASIL-D | ISO 26262 ASIL-D | [DATA_NEEDED] | [DATA_NEEDED] |
| AEC-Q100 | Qualified | Qualified | Qualified | Qualified | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Integrated safety features for ISO 26262 ASIL-D (vs TPS6594-Q1)
- Wide input voltage range of 4.5V to 40V (vs TPS65385A-Q1)
- Exact drop-in replacement for TPS65381-Q1 (vs TPS65381-Q1)
Design Notes
The TPS65381A-Q1 in the 32-HTSSOP package has a thermal pad that must be soldered to a large copper area on the PCB for effective heat dissipation. The power dissipation is dominated by the LDOs when the input voltage is high. For example, at VIN=12V and LDO output 3.3V at 100mA, each LDO dissipates 0.87W. Ensure adequate copper pour and vias to keep the junction temperature below 150Β°C. Refer to the TI application note SLMA002 for thermal design guidelines.
Place input and output capacitors close to the respective pins to minimize parasitic inductance. Use a 10uF ceramic capacitor for the buck input and a 22uF for the buck output. For LDOs, use 2.2uF output capacitors. The SPI lines should be routed with controlled impedance and kept away from high-current switching nodes to avoid noise coupling. Follow the layout recommendations in the datasheet for optimal performance.
Do not exceed the absolute maximum input voltage of 40V. Ensure the SPI interface is properly configured to avoid unintended register writes. The watchdog timer must be serviced regularly by the MCU to prevent false resets. When using the fail-safe output, ensure it is connected to the MCU's reset or interrupt pin. Also, verify the output voltage settings via SPI to match the MCU requirements.
Compliance Information
RoHS compliant per Avaq FAQ. AEC-Q100 qualified per TI product page. Other compliance data not specified in provided sources.
