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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Texas Instruments TPS784085BQWDRBRQ1

Name: TPS784085BQWDRBRQ1
Brand: Texas Instruments
SKU: TPS784085BQWDRBRQ1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TPS784085BQWDRBRQ1

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 8-VDFN Exposed Pad

Datasheet:: TPS784085BQWDRBRQ1.pdf

Description:: IC REG LINEAR 0.85V 300MA 8SON

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Product details

Overview

TPS784085BQWDRBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LDO voltage regulator delivering 300 mA output with 0.65 V fixed output, 115 mV max dropout at 300 mA (3.3 V_OUT), ±1.7% output accuracy over –40°C to +150°C junction temperature, and 50-dB PSRR up to 100 kHz - used for powering sensitive analog rails in head units and instrument clusters.

For engineers reviewing the TPS784085BQWDRBRQ1 datasheet, TPS784085BQWDRBRQ1 pinout, TPS784085BQWDRBRQ1 application, or TPS784085BQWDRBRQ1 equivalent, key selection criteria include ultra-low dropout under high load, functional safety documentation support, wettable flank VSON-8 packaging for automated optical inspection, and 25 µA typical quiescent current enabling always-on subsystems.

Technical Context

The TPS784085BQWDRBRQ1 implements a PMOS pass transistor architecture enabling ultra-low dropout and foldback current limiting during overload. Its internal 500-µs soft-start reduces inrush current, while active output discharge ensures rapid V_OUT collapse when disabled.

It operates across 1.65 V to 6.0 V input range with thermal shutdown (170°C) and UVLO (1.42 V nominal rising threshold). The device supports functional safety system design via TI's documented FIT rate, failure mode analysis, and diagnostic coverage reports.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 0.65 V - powers core logic of low-voltage automotive MCUs and SoCs requiring sub-1-V supply rails.
Max Output Current	300 mA - sufficient for post-regulation of intermediate power domains in telematics control units.
Dropout Voltage	115 mV (max) at 300 mA and 3.3 V_OUT - enables stable regulation even with tight input margins (e.g., 3.3 V IN → 3.3 V OUT).
Output Accuracy	±1.7% over –40°C to +150°C - meets stringent automotive rail tolerance requirements without external trimming.
PSRR	50 dB at 100 kHz - suppresses switching noise from upstream DC/DC converters feeding analog sensor interfaces.
I_Q	25 µA typical - allows battery-backed always-on monitoring circuits to operate >10 years on coin-cell energy budgets.
Enable Threshold	V_EN(HI) = 0.85 V min - compatible with 1.2-V or 1.8-V GPIOs for precise power sequencing control.

Pinout & Package

TPS784085BQWDRBRQ1 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 joints. Thermal pad is electrically tied to GND.

Pin/Terminal	Circuit Role	Design Meaning
1 - OUT	Regulated output	Delivers 0.65 V to load; requires ≥0.47 µF ceramic capacitor to ground for stability.
2 - NC	No-connect	Not internally bonded; connect to GND for improved thermal performance.
3 - NC	No-connect	Not internally bonded; connect to GND for improved thermal performance.
4 - NC	No-connect	Not internally bonded; connect to GND for improved thermal performance.
5 - GND	Ground reference	Primary return path; must be connected to low-impedance PCB ground plane.
6 - EN	Enable control input	Active-high logic; drives device ON when ≥0.85 V, OFF when ≤0.425 V; must not float.
7 - NC	No-connect	Not internally bonded; connect to GND for improved thermal performance.
8 - IN	Input supply	Accepts 1.65–6.0 V; requires ≥0.1 µF ceramic capacitor to GND, placed adjacent to pin.

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for –40°C to +125°C ambient operation - certified for engine bay and cabin electronics placement.
Functional Safety-Capable documentation	Includes FIT rate, FMEA, and diagnostic coverage reports - accelerates ISO 26262 ASIL-B system certification.
Active output discharge	Internal pulldown circuit discharges V_OUT rapidly upon disable - prevents floating outputs in multi-rail power sequencing.
Foldback current limit	Reduces power dissipation during sustained overcurrent - protects pass element during short-circuit events without thermal runaway.
Ultra-low 25 µA quiescent current	Enables <1 µA system standby current when paired with low-I_Q enable logic - critical for parking-mode telematics.

Applications

Automotive Head Units	Hybrid Instrument Clusters
Use Scenario: Powering audio DSP cores and display interface logic in infotainment systems with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Post-regulator supplying clean 0.65 V to low-voltage processor cores downstream of buck converters. Use Value: 50-dB PSRR at 100 kHz attenuates switching noise from 2-MHz DC/DC stages, preserving audio SNR and display timing integrity.	Use Scenario: Delivering stable 0.65 V to microcontroller subsystems managing gauge rendering and CAN message aggregation. IC Role / Device Role / Timing Role: Primary low-noise supply for ASIL-B-compliant MCU domains requiring deterministic startup and fault response. Use Value: Internal 500-µs soft-start ensures controlled ramp-up without disrupting CAN bus arbitration during cold cranking.
Telematics Control Units	DC/DC Converter Bias Rails
Use Scenario: Supplying always-on real-time clock and cellular modem wake-up circuitry in LTE/V2X gateways. IC Role / Device Role / Timing Role: Standby LDO maintaining bias for GPS/GNSS RF front-end and secure boot ROM during vehicle sleep modes. Use Value: 25 µA typical I_Q enables >10-year battery life in backup power configurations using CR2032 cells.	Use Scenario: Generating precision 0.65 V bias for gate drivers and error amplifiers in synchronous buck controllers. IC Role / Device Role / Timing Role: High-accuracy reference source for feedback networks and driver IC logic thresholds. Use Value: ±1.7% output accuracy over full temperature range eliminates need for external calibration in production test.

Automotive Head Units

Hybrid Instrument Clusters

Use Scenario: Powering audio DSP cores and display interface logic in infotainment systems with strict EMI and thermal constraints.

IC Role / Device Role / Timing Role: Post-regulator supplying clean 0.65 V to low-voltage processor cores downstream of buck converters.

Use Value: 50-dB PSRR at 100 kHz attenuates switching noise from 2-MHz DC/DC stages, preserving audio SNR and display timing integrity.

Use Scenario: Delivering stable 0.65 V to microcontroller subsystems managing gauge rendering and CAN message aggregation.

IC Role / Device Role / Timing Role: Primary low-noise supply for ASIL-B-compliant MCU domains requiring deterministic startup and fault response.

Use Value: Internal 500-µs soft-start ensures controlled ramp-up without disrupting CAN bus arbitration during cold cranking.

Telematics Control Units

DC/DC Converter Bias Rails

Use Scenario: Supplying always-on real-time clock and cellular modem wake-up circuitry in LTE/V2X gateways.

IC Role / Device Role / Timing Role: Standby LDO maintaining bias for GPS/GNSS RF front-end and secure boot ROM during vehicle sleep modes.

Use Value: 25 µA typical I_Q enables >10-year battery life in backup power configurations using CR2032 cells.

Use Scenario: Generating precision 0.65 V bias for gate drivers and error amplifiers in synchronous buck controllers.

IC Role / Device Role / Timing Role: High-accuracy reference source for feedback networks and driver IC logic thresholds.

Use Value: ±1.7% output accuracy over full temperature range eliminates need for external calibration in production test.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO voltage regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS78401BQWDRBRQ1	Adjustable output (1.2–5.5 V) via external resistor divider; same package, specs, and qualification.	Used where flexible output voltage is required across multiple board revisions or variants.	Select when programmable output is needed; requires FB pin routing and two external resistors.
TLV76706QWDRBRQ1	Fixed 0.6 V output, 500-mA rating, 190-mV dropout at 500 mA, 45 µA I_Q, no active discharge.	Higher current capability but looser accuracy (±2%) and no functional safety documentation.	Select for cost-sensitive non-ASIL applications needing higher output current; not suitable for ASIL-B systems.

Compared with TPS784085BQWDRBRQ1, the TPS78401BQWDRBRQ1 offers design flexibility through adjustable output but adds BOM and layout complexity, while the TLV76706QWDRBRQ1 trades functional safety compliance and tighter accuracy for higher current and lower cost in less demanding automotive subsystems.

Availability

TPS784085BQWDRBRQ1 is available at Aetrix Electronics and suitable for automotive head units, hybrid instrument clusters, and telematics control units requiring stable component supply with AEC-Q100 traceability and long-term lifecycle support.

Supply support for TPS784085BQWDRBRQ1 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.

The TPS784-Q1 product line delivers high-PSRR, low-I_Q LDOs engineered specifically for ASIL-B automotive subsystems where reliability, thermal robustness, and functional safety documentation are mandatory.

FAQ

What is the maximum input voltage rating for the TPS784085BQWDRBRQ1?

The TPS784085BQWDRBRQ1 has an absolute maximum input voltage of 6.5 V. Its recommended operating input range is 1.65 V to 6.0 V. Exceeding 6.5 V risks permanent damage per the Absolute Maximum Ratings table. For reliable operation in automotive environments with load dump transients, external clamping or pre-regulation is advised when VIN may exceed 6.0 V.

Does the TPS784085BQWDRBRQ1 support functional safety certification?

Yes, the TPS784085BQWDRBRQ1 is Functional Safety-Capable: Texas Instruments provides FIT rate data, failure mode effects analysis (FMEA), and diagnostic coverage reports to support ISO 26262 ASIL-B system-level certification. These documents are accessible via TI's functional safety information center and are specific to the TPS784085BQWDRBRQ1 device variant.

What is the purpose of the NC pins on the TPS784085BQWDRBRQ1 VSON-8 package?

The TPS784085BQWDRBRQ1 has four NC pins (pins 2, 3, 4, and 7) in its DRB package. These pins are not internally connected. TI recommends connecting them to GND to improve thermal performance and mechanical stability of the solder joint - especially critical for automotive under-hood reliability. Leaving them floating is allowed but not optimal for thermal dissipation.

How does the TPS784085BQWDRBRQ1 handle output short-circuit conditions?

The TPS784085BQWDRBRQ1 employs foldback current limiting to manage short-circuit faults: output current decreases as V_OUT collapses, reducing power dissipation in the pass element. Short-circuit current is limited to 162.5 mA (typical). Combined with thermal shutdown (170°C trip), this prevents destructive overheating during sustained shorts - a key requirement for automotive power rails.

Is the TPS784085BQWDRBRQ1 pin-compatible with other devices in the TPS784-Q1 family?

Yes, all TPS784-Q1 variants in the DRB (VSON-8) package - including TPS784085BQWDRBRQ1, TPS78401BQWDRBRQ1, and TPS78412BQWDRBRQ1 - share identical pinout, footprint, and thermal pad configuration. This enables drop-in replacement across output voltage options without PCB redesign, provided EN and GND connections remain consistent.

TPS784085BQWDRBRQ1 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 8-VDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 6V

Voltage - Output (Min/Fixed):: 0.85V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.78V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 40 µA

Current - Supply (Max):: -

PSRR:: 65dB ~ 30dB (1kHz ~ 1MHz)

Control Features:: Current Limit, Enable

Protection Features:: Over Current, Over Temperature, Under Voltage Lockout (UVLO)

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 8-SON (3x3)

TPS784085BQWDRBRQ1 FAQ

1.How can I place an order for TPS784085BQWDRBRQ1 through Aetrix?

Please submit a Request for Quotation (RFQ) for TPS784085BQWDRBRQ1 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 TPS784085BQWDRBRQ1 reliable?

The price and inventory of TPS784085BQWDRBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS784085BQWDRBRQ1 is usually 5 days.

3.What payment methods are accepted for TPS784085BQWDRBRQ1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS784085BQWDRBRQ1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TPS784085BQWDRBRQ1?

TPS784085BQWDRBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TPS784085BQWDRBRQ1 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 TPS784085BQWDRBRQ1?

For technical support, including TPS784085BQWDRBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS784085BQWDRBRQ1 requirements.

6.How does Aetrix verify that TPS784085BQWDRBRQ1 is sourced from the original manufacturer or authorized distributors?

All TPS784085BQWDRBRQ1 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 TPS784085BQWDRBRQ1 meets industry standards.

7.What is the process for return or replacement of TPS784085BQWDRBRQ1?

All TPS784085BQWDRBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS784085BQWDRBRQ1, 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 TPS784085BQWDRBRQ1 part is unused and in its original packaging.

Return procedure for TPS784085BQWDRBRQ1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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