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Texas Instruments TPS78508BQWDRBRQ1
- Part No.:
- TPS78508BQWDRBRQ1
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
TPS78508BQWDRBRQ1.pdf
- Description:
- AUTOMOTIVE, 1-A HIGH-ACCURACY AD
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Product details
Overview
TPS78508BQWDRBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade ultra-low-dropout linear regulator delivering 1 A output current with 0.5% typical output accuracy, 315 mV max dropout at 1 A (3.3 VOUT), and 25 µA typical quiescent current - designed for post-regulation in safety-critical ADAS and infotainment power rails.
For engineers reviewing the TPS78508BQWDRBRQ1 datasheet, TPS78508BQWDRBRQ1 pinout, TPS78508BQWDRBRQ1 application, or TPS78508BQWDRBRQ1 equivalent, key selection criteria include its wettable-flank VSON-8 package, active output discharge, 550 µs soft-start, -40°C to +125°C ambient operation, and fixed 0.8-V output voltage optimized for low-voltage SoC core supplies.
Technical Context
The TPS78508BQWDRBRQ1 implements a high-PSRR, low-noise LDO architecture with internal 1.2-V bandgap reference, foldback current limiting, and thermal shutdown protection. Its control loop supports fast load transient response (10 µs settling time) and maintains stability with ≥0.47 µF ceramic output capacitance.
It integrates undervoltage lockout (UVLO) with 1.42 V rising threshold and 130 mV hysteresis, EN pin logic-level compatibility (VEN(HI) = 0.9 V), and active pulldown circuitry enabling rapid output discharge when disabled - critical for automotive power sequencing and fault recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 0.8 V - matches low-voltage processor core rails requiring precise sub-1-V regulation. |
| Max Output Current | 1 A - sufficient to power automotive SoCs, radar MMICs, or DSP cores without external boost stages. |
| Dropout Voltage | 315 mV max at 1 A (3.3 VOUT) - enables operation from 1.115 V input, supporting wide VIN range (1.7–6.0 V). |
| Output Accuracy | ±1.7% over –40°C to +150°C junction - ensures stable core voltage under extreme engine bay thermal stress. |
| Quiescent Current | 25 µA typical - minimizes standby power loss in always-on vehicle modules (e.g., telematics wake-up circuits). |
| PSRR | 60 dB at 1 kHz - suppresses ripple from upstream DC/DC converters feeding noise-sensitive analog subsystems. |
| Soft-Start Time | 550 µs typical - controls inrush current during cold crank, reducing input capacitor stress and system brownout risk. |
Pinout & Package
TPS78508BQWDRBRQ1 uses the wettable flank VSON-8 (DRB) package (3.00 mm × 3.00 mm), optimized for automated optical inspection (AOI) and high-reliability automotive solder joint integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Regulated output | Delivers 0.8 V to load; requires ≥0.47 µF ceramic capacitor to GND for stability and transient response. |
| 2, 3, 4, 6 - NC | No-connect | Not internally bonded; connect to GND plane for optimal thermal performance per TI layout guidelines. |
| 5 - GND | Power ground | Reference return for all internal circuits; must be tied to low-impedance PCB ground plane. |
| 7 - EN | Enable input | Active-high logic control (VEN(HI) ≥ 0.9 V); must not float - tie to IN if unused. |
| 8 - IN | Input supply | Accepts 1.7–6.0 V; requires ≥0.1 µF ceramic capacitor close to pin for EMI suppression. |
| Thermal Pad | Ground-connected thermal path | Electrically tied to GND; must be soldered to large copper area for RθJB = 31.4°C/W thermal resistance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive cabin and engine compartment thermal requirements. |
| Active output discharge | Internal pulldown resistor (~100 Ω at 3.3 V) rapidly discharges OUT when EN = low - prevents floating voltage during power-down sequencing. |
| Foldback current limit | Transitions from brickwall (1.04–1.65 A) to foldback mode below 0.4×VOUT(NOM) - limits power dissipation during short-circuit faults. |
| Ultra-low noise (30 µVRMS) | Enables clean power for RF receivers, ADC references, and high-speed SerDes PHYs without additional filtering. |
| Thermal shutdown with hysteresis | Shuts down at 170°C junction, resets at 155°C - prevents thermal runaway while allowing safe recovery after transient overload. |
Applications
| Automotive Head Units | Hybrid Instrument Clusters |
|---|---|
Use Scenario: Powering display controller SoCs and audio codecs in centralized infotainment systems subject to cold-crank and load-dump transients. IC Role / Device Role / Timing Role: Primary 0.8-V core LDO for application processors, providing low-noise, high-accuracy regulation independent of upstream DC/DC ripple. Use Value: 60 dB PSRR at 1 kHz rejects switching noise from buck converters; 25 µA IQ extends battery life during vehicle sleep mode. | Use Scenario: Supplying microcontroller cores and graphics accelerators in digital instrument clusters with dual-display redundancy. IC Role / Device Role / Timing Role: Fixed-output LDO delivering stable 0.8 V to safety-critical MCU domains requiring ASIL-B compliance. Use Value: ±1.7% accuracy across –40°C to +150°C ensures reliable operation during extended high-temperature soak tests. |
| Telematics Control Units | Medium-Range Radar Modules |
Use Scenario: Regulating power to LTE/C-V2X modems and GNSS receivers in connected vehicle gateways operating 24/7. IC Role / Device Role / Timing Role: Always-on LDO with active discharge, enabling controlled power-down during firmware updates and secure boot sequences. Use Value: 550 µs soft-start prevents inrush-induced voltage sag on shared 3.3-V rail; EN pin supports precise power sequencing with baseband SoC. | Use Scenario: Providing clean 0.8-V bias to 77-GHz radar transceiver ASICs in front-end ADAS sensors exposed to under-hood vibration and thermal cycling. IC Role / Device Role / Timing Role: Low-noise post-regulator isolating sensitive RF analog blocks from noisy digital supply domains. Use Value: 30 µVRMS output noise avoids phase noise degradation in local oscillator chains; wettable flank package ensures solder joint reliability over 15-year vehicle lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7B8701QKVURQ1 | Fixed 0.8-V output, 1.5-A rating, higher IQ (45 µA typ), TO-263-7 package | Higher current capability but larger footprint and no wettable flank; lacks active discharge | Choose for higher load margin where board space allows and active discharge is not required. |
| TLV76708QWDRBRQ1 | Fixed 0.8-V output, 1-A rating, lower IQ (20 µA typ), same VSON-8 package, no foldback current limit | Lower quiescent current but missing foldback protection and thermal shutdown reset hysteresis | Choose for ultra-low-power always-on nodes where fault robustness is secondary to standby efficiency. |
Compared with TPS7B8701QKVURQ1 and TLV76708QWDRBRQ1, the TPS78508BQWDRBRQ1 uniquely combines wettable flank packaging, active output discharge, and foldback current limiting - making it the only option qualified for demanding AEC-Q100 Grade 1 applications requiring both reliability and precise power sequencing control.
Availability
TPS78508BQWDRBRQ1 is available at Aetrix Electronics and suitable for automotive head units, hybrid instrument clusters, and telematics control units requiring stable component supply with full AEC-Q100 traceability and long-term production support.
Supply support for TPS78508BQWDRBRQ1 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 and embedded processing technologies, with deep expertise in automotive-grade power management ICs.
The TPS785-Q1 product line was engineered specifically for AEC-Q100-compliant automotive subsystems demanding high accuracy, ultra-low dropout, and robust fault protection - including ADAS sensors, infotainment SoCs, and body control modules.
FAQ
What is the output voltage tolerance of the TPS78508BQWDRBRQ1 over temperature?
The TPS78508BQWDRBRQ1 guarantees ±1.7% output voltage accuracy across the full AEC-Q100 Grade 1 junction temperature range of –40°C to +150°C. At 25°C, typical accuracy is ±0.5%, and over –40°C to +85°C it is ±1.0%. This tight tolerance ensures reliable operation of voltage-sensitive automotive processors without external calibration.
Does the TPS78508BQWDRBRQ1 require an external feedback resistor network?
No, the TPS78508BQWDRBRQ1 is a fixed-output 0.8-V LDO and does not use the FB pin. The FB pin is not connected internally in this variant - it is an NC (no-connect) terminal per the DRB package pinout. External resistors are only required for adjustable-output versions of the TPS785-Q1 family.
What is the maximum allowable input voltage for the TPS78508BQWDRBRQ1?
The absolute maximum input voltage for the TPS78508BQWDRBRQ1 is 6.5 V, but the recommended operating range is 1.7 V to 6.0 V. Exceeding 6.0 V may trigger the internal UVLO or cause reliability degradation. For 0.8-V output, minimum valid input is 1.115 V (0.8 V + 315 mV dropout), ensuring regulation across the full load and temperature range.
How does the active output discharge function work in the TPS78508BQWDRBRQ1?
The TPS78508BQWDRBRQ1 integrates an internal pulldown transistor activated when EN is driven low. It presents ~100 Ω resistance from OUT to GND (at VIN = 3.3 V), discharging output capacitance rapidly. This prevents floating voltages that could cause latch-up in downstream logic and enables deterministic power-down sequencing in automotive ECUs.
Is the TPS78508BQWDRBRQ1 compatible with standard VSON-8 reflow profiles?
Yes, the TPS78508BQWDRBRQ1's wettable flank VSON-8 (DRB) package is compatible with IPC/JEDEC J-STD-020D reflow profiles for lead-free assembly. Its thermal pad design supports standard stencil aperture and solder paste volume recommendations, and the wettable flanks enable automated optical inspection of side-solder joints - critical for automotive zero-defect manufacturing.
TPS78508BQWDRBRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- -
- Output Type:
- -
- Number of Regulators:
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- -
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
TPS78508BQWDRBRQ1 FAQ
1.How can I place an order for TPS78508BQWDRBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS78508BQWDRBRQ1 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 TPS78508BQWDRBRQ1 reliable?
The price and inventory of TPS78508BQWDRBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS78508BQWDRBRQ1 is usually 5 days.
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Once your TPS78508BQWDRBRQ1 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 TPS78508BQWDRBRQ1?
For technical support, including TPS78508BQWDRBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS78508BQWDRBRQ1 requirements.
6.How does Aetrix verify that TPS78508BQWDRBRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS78508BQWDRBRQ1 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 TPS78508BQWDRBRQ1 meets industry standards.
7.What is the process for return or replacement of TPS78508BQWDRBRQ1?
All TPS78508BQWDRBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS78508BQWDRBRQ1, 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 TPS78508BQWDRBRQ1 part is unused and in its original packaging.
Return procedure for TPS78508BQWDRBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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