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Texas Instruments TPS43331QDAPRQ1
- Part No.:
- TPS43331QDAPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 38-PowerTSSOP (0.240", 6.10mm Width)
- Datasheet:
-
TPS43331QDAPRQ1.pdf
- Description:
- IC REG QD BUCK/LNR SYNC 38HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,222
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Product details
Overview
TPS43331QDAPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive power management IC integrating two synchronous buck controllers (up to 4 A each), a high-voltage tolerant standby linear regulator (VSTBY, 1.2–3.6 V, 300 mA, 65 µA quiescent current), a programmable linear regulator (VLR, 1.2–8.5 V, 650 mA), a protected high-side driver (HSD), and I²C-configurable supervision functions including LVW, OVSD, and POR. It serves as a multi-rail power supply for automotive microcontrollers and DSPs.
For engineers reviewing the TPS43331QDAPRQ1 datasheet, TPS43331QDAPRQ1 pinout, TPS43331QDAPRQ1 application, or TPS43331QDAPRQ1 equivalent, key selection criteria include its dual-buck + dual-LDO architecture, 5–30 V input range, thermal shutdown with hysteresis, I²C register programmability, and HTSSOP-38 PowerPAD™ package optimized for automotive under-hood thermal environments.
Technical Context
The TPS43331QDAPRQ1 implements two independent synchronous buck controllers with external gate drive outputs (VGT1/VGB1 and VGT2/VGB2), enabling use of discrete MOSFETs for flexible voltage/current scaling. Each channel supports adjustable output (1.2–10 V), ±5% regulation tolerance, and soft-start via feedback loop control.
It integrates two linear regulators: VSTBY (high-side, battery-direct, 65 µA IQ) and VLR (switched via I²C), both with internal overcurrent and thermal protection. Supervision includes programmable low-voltage warning (LVWIN), overvoltage shutdown (27 V), power-on reset (5 ms delay), and I²C-addressable configuration of PGDLY, slew rate, and enable sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5 V to 30 V - supports full automotive battery range including cold-crank (6 V) and load-dump (26.5 V) |
| Buck Output Current (each) | Up to 4 A - enables direct powering of high-current MCUs or domain controllers without external current boosting |
| VSTBY Quiescent Current | 65 µA typ - ensures ultra-low standby power for always-on vehicle modules (e.g., body control units) |
| I²C Interface | Standard-mode (100 kHz) - allows dynamic reconfiguration of VLR, PGDLY, LVW threshold, and enable states in-system |
| Thermal Shutdown Threshold | 150°C (hysteresis 5–15°C) - protects against sustained overloads in sealed enclosures or high-ambient under-hood locations |
| Package Thermal Resistance | RθJA = 25°C/W - validated on JEDEC JESD51-5 board with thermal vias, enabling >2 W continuous dissipation at 125°C ambient |
| Automotive Qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient) - certified for engine compartment and front-end electronics placement |
Pinout & Package
TPS43331QDAPRQ1 uses a thermally enhanced 38-pin HTSSOP (DAP) package measuring 12.50 mm × 6.10 mm, featuring an exposed PowerPAD™ thermal pad for direct PCB copper connection and low-junction-to-board resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AGND | Analog ground reference | Separate low-noise return path for feedback and sensing circuits; must be tied to PGND at single point near IC |
| 3 VSTBY | Standby regulator output | Primary always-on rail for MCU real-time clock, CAN transceivers, or security modules; HV-tolerant up to 30 V input |
| 9 VLR | Linear regulator output | Configurable auxiliary rail (1.2–8.5 V); enabled/disabled via I²C to reduce system leakage during sleep modes |
| 17 HSD | Protected high-side driver output | Drives external loads (e.g., solenoids, lamps) up to 450 mA; includes short-circuit current limiting and thermal shutdown |
| 11 SDA / 12 SCL | I²C bidirectional data/clock | Enable runtime adjustment of VLR voltage, PGDLY capacitor value, LVW thresholds, and fault response behavior |
| 22 VGB1 / 36 VGT1 | Channel 1 gate drives | Provide synchronous FET control signals; support external N-channel high/low-side MOSFETs for buck conversion |
| 30 PGND | Power ground reference | High-current return path for buck converters and HSD; must be routed with wide copper and connected to PowerPAD™ |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck controllers | Independent 4-A capable channels with external gate drive outputs (VGTx/VGBx), supporting flexible MOSFET selection and layout optimization |
| Low-IQ standby regulator (VSTBY) | 65 µA typical quiescent current enables <100 µA system standby draw - critical for ISO 26262-compliant always-on domains |
| I²C-configurable supervision | Registers allow dynamic setting of power-good delay (PGDLY), low-voltage warning threshold (LVWIN), and VLR enable state without hardware changes |
| Reverse-protected high-side driver (HSD) | Integrated charge pump and current limiting protect against battery reversal and inductive kickback - eliminates need for external protection diodes |
| Thermal and overcurrent protection | Per-regulator thermal shutdown (150°C) and current-limit detection on all outputs ensure robustness across automotive temperature extremes |
Applications
| Engine Control Unit (ECU) Power Supply | Advanced Driver Assistance Systems (ADAS) Camera Module |
|---|---|
Use Scenario: Supplies multiple voltage rails (1.2 V core, 3.3 V I/O, 5 V sensors) to a dual-core automotive MCU and associated peripherals within an engine bay environment. IC Role / Device Role / Timing Role: Central power management IC providing regulated buck outputs, always-on VSTBY for watchdog and wake-up logic, and HSD for fuel injector control sequencing. Use Value: Eliminates need for discrete LDOs and discrete high-side switches while maintaining AEC-Q100 compliance and thermal resilience at 125°C ambient. |
Use Scenario: Powers image sensor, ISP processor, and serializer in a compact rear-view camera module mounted near exhaust or transmission. IC Role / Device Role / Timing Role: Delivers clean, low-noise 1.8 V (VLR) and 3.3 V (buck) rails; uses VSTBY for always-on CAN wake-up; leverages I²C to dynamically adjust VLR during low-power imaging modes. Use Value: Reduces BOM count by 7+ components (LDOs, reset IC, discrete HSD) and enables firmware-controlled power sequencing to meet ASIL-B functional safety requirements. |
| Body Control Module (BCM) | Infotainment Head Unit Power Tree |
Use Scenario: Manages power for door modules, lighting drivers, and LIN transceivers in a centralized vehicle body controller. IC Role / Device Role / Timing Role: Provides VSTBY for real-time clock and CAN interface, VLR for microcontroller I/O, and HSD for interior lamp control - all with integrated fault reporting via I²C. Use Value: Enables single-chip solution for multi-rail, multi-function power delivery with diagnostic visibility (e.g., thermal status, OV/UV flags) over existing vehicle bus infrastructure. |
Use Scenario: Generates 1.1 V CPU core, 1.8 V memory, and 3.3 V interface rails for a quad-core infotainment SoC, plus standby power for Bluetooth/WiFi co-processors. IC Role / Device Role / Timing Role: Dual buck controllers deliver high-efficiency main rails; VSTBY powers always-on subsystems; I²C allows SoC firmware to adapt VLR voltage during DVFS transitions. Use Value: Achieves >85% efficiency at 2 A per buck channel (12 V input → 3.3 V), reducing thermal load in space-constrained dash-mounted enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail automotive power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS43351QDAPRQ1 | Same pinout and feature set, but adds spread-spectrum clocking (SSC) to reduce EMI; identical electrical specs and thermal performance | Better suited for EMI-sensitive infotainment or ADAS radar systems where conducted emissions must meet CISPR 25 Class 5 limits | Select TPS43351QDAPRQ1 when SSC is required; otherwise TPS43331QDAPRQ1 offers identical functionality at lower cost |
| MPQ4333-AEC1 | Monolithic dual-buck (no external FET drives); integrates MOSFETs; lacks VSTBY, VLR, HSD, and I²C; smaller 20-pin QFN | Limited to simpler applications requiring only two fixed/adjustable buck outputs - no linear regulators or high-side switching capability | Choose MPQ4333-AEC1 only if system requires minimal BOM and does not need standby rail, programmable LDO, or load driving |
Compared with TPS43351QDAPRQ1 and MPQ4333-AEC1, the TPS43331QDAPRQ1 uniquely combines dual external-FET buck controllers, battery-direct VSTBY, I²C-programmable VLR, and protected HSD in one AEC-Q100 Grade 1 package - making it the only option for complex automotive domains requiring both high-efficiency conversion and intelligent supervision.
Availability
TPS43331QDAPRQ1 is available at Aetrix Electronics and suitable for automotive ECUs, ADAS camera modules, body control units, and infotainment head units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TPS43331QDAPRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and automotive-grade power management solutions, with decades of automotive qualification expertise and broad AEC-Q100 portfolio coverage.
The TPS43331QDAPRQ1 belongs to TI's automotive power management IC product line, designed specifically to consolidate multi-rail power delivery, supervision, and load driving into a single AEC-Q100-compliant device for next-generation vehicle electronic control units.
FAQ
What is the maximum continuous output current supported by each buck regulator in the TPS43331QDAPRQ1?
The TPS43331QDAPRQ1 supports up to 4 A continuous output current per buck channel (VBUCK1 and VBUCK2), as specified in the DC Electrical Characteristics table under "Switch mode regulators (Channel 1)" and "(Channel 2)" sections. This rating assumes proper thermal design using the HTSSOP-38 PowerPAD™ package with adequate PCB copper area and airflow.
Does the TPS43331QDAPRQ1 include built-in protection features, and which ones are implemented per rail?
Yes, the TPS43331QDAPRQ1 includes per-rail protection: overcurrent and thermal shutdown on both buck regulators, VSTBY, VLR, and the HSD output; overvoltage shutdown (27 V) on VBAT; undervoltage lockout (5.2 V); and low-voltage warning with programmable threshold. All protections are hardware-based and operate independently of I²C communication.
Can the TPS43331QDAPRQ1's VSTBY output be used directly from the vehicle battery without external components?
Yes - the VSTBY regulator is explicitly designed for direct connection to the automotive battery (VBATP or VINSB). It tolerates input voltages from 5 V to 30 V, includes reverse-polarity protection, and maintains regulation down to 65 µA quiescent current, making it suitable for always-on applications such as CAN wake-up circuitry in the TPS43331QDAPRQ1.
How is the power-good delay (PGDLY) function implemented in the TPS43331QDAPRQ1, and what capacitor value achieves a 50-µs delay?
The PGDLY function uses an external capacitor connected to pin 18 (PGDLY) to set the delay before RST deassertion after VSTBY reaches regulation. Per the datasheet, a 100 pF capacitor yields a typical delay of 25–100 µs; therefore, a 100 pF capacitor is recommended to achieve a nominal 50-µs delay for the TPS43331QDAPRQ1, ensuring reliable power sequencing in automotive microcontroller startup.
Is the TPS43331QDAPRQ1 compatible with standard I²C buses operating at 100 kHz, and what are the voltage level requirements for SDA/SCL?
Yes, the TPS43331QDAPRQ1 supports standard-mode I²C at 100 kHz. Its SDA and SCL pins require logic-high input voltage ≥2.0 V and logic-low ≤0.8 V, with input leakage current bounded between –1 µA and +1 µA. The interface operates from 4.5 V to 5.3 V supply, matching standard 5-V microcontroller I/O levels - fully compatible with common automotive MCU I²C peripherals.
TPS43331QDAPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-PowerTSSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (2), Linear (LDO) (2)
- Number of Outputs:
- 4
- Frequency - Switching:
- 165kHz
- Voltage/Current - Output 1:
- Controller
- Voltage/Current - Output 2:
- Controller
- Voltage/Current - Output 3:
- 1.2V ~ 8.5V, 650mA
- w/LED Driver:
- No
- w/Supervisor:
- Yes
- w/Sequencer:
- No
- Voltage - Supply:
- 1.8V ~ 30V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-HTSSOP
TPS43331QDAPRQ1 FAQ
1.How can I place an order for TPS43331QDAPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS43331QDAPRQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS43331QDAPRQ1 reliable?
The price and inventory of TPS43331QDAPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS43331QDAPRQ1 is usually 5 days.
3.What payment methods are accepted for TPS43331QDAPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS43331QDAPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS43331QDAPRQ1?
TPS43331QDAPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS43331QDAPRQ1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS43331QDAPRQ1?
For technical support, including TPS43331QDAPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS43331QDAPRQ1 requirements.
6.How does Aetrix verify that TPS43331QDAPRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS43331QDAPRQ1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS43331QDAPRQ1 meets industry standards.
7.What is the process for return or replacement of TPS43331QDAPRQ1?
All TPS43331QDAPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS43331QDAPRQ1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS43331QDAPRQ1 part is unused and in its original packaging.
Return procedure for TPS43331QDAPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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