Texas Instruments TPS92691QPWPTQ1 – Automotive (AEC‑Q100) Multi‑Topology LED Controller, HTSSOP‑16 PowerPAD
The Texas Instruments TPS92691QPWPTQ1 is an automotive‑qualified, single‑channel LED lighting controller from the TPS92691‑Q1 series. Built for demanding exterior and interior automotive LED applications, it drives high‑brightness LEDs using an external MOSFET and supports multiple DC/DC topologies—including boost, SEPIC, and flyback. The device integrates analog and PWM dimming support, robust protection features, and design options aimed at low EMI performance, all in a compact HTSSOP‑16 (PWP) package with an exposed PowerPAD for efficient thermal dissipation.
Engineers selecting the TPS92691QPWPTQ1 benefit from the flexibility to optimize efficiency, current regulation, and EMI across a wide input range typical of vehicle electrical systems. Buyers and sourcing managers gain confidence from its Active lifecycle status, AEC‑Q100 automotive qualification, and RoHS compliance, plus clear ordering options for small‑reel and full tape‑and‑reel packaging.
Highlights at a glance
- Brand/manufacturer: Texas Instruments (TI)
- Part number (MPN): TPS92691QPWPTQ1 (TPS92691‑Q1 series)
- Category: LED Drivers / Lighting Controllers
- Automotive grade: AEC‑Q100 qualified
- Control architecture: Single‑channel LED controller with external MOSFET
- Supported topologies: Boost, SEPIC, Flyback
- Dimming: Analog and PWM dimming support
- EMI: Designed for low EMI; optional spread‑spectrum features (see datasheet)
- Protections: UVLO, OVP, current limit, thermal shutdown (see datasheet)
- Package: HTSSOP‑16 (PWP) with exposed PowerPAD
- Mounting: Surface mount (SMT)
- Pin count: 16
- RoHS: RoHS compliant, lead‑free
Where the TPS92691QPWPTQ1 fits in your design
Modern automotive lighting requires precise current regulation, flexible dimming, and high efficiency across vehicle transients and a wide input range. The Texas Instruments TPS92691QPWPTQ1 targets exactly this space:
- Exterior lighting: headlamps, daytime running lights (DRLs), fog lamps, and rear combination lamps (stop/turn/tail).
- Interior and ambient lighting: consistent current control with low noise and flexible dimming options.
- Multi‑topology support: enables you to match the power stage to your LED string voltage relative to the input bus—boost for stepping up, SEPIC for input/output decoupling and wide range handling, and flyback for isolated or higher‑ratio designs.
Because the TPS92691QPWPTQ1 controls an external power MOSFET, designers can scale the power stage to meet current and thermal targets without being constrained by an integrated FET’s ratings. This also provides a path to optimize for conduction losses, switching frequency, magnetics selection, and EMI performance to suit platform requirements.
Specifications
Electrical and functional features
- Qualification: AEC‑Q100 (Automotive)
- Controller type: Single‑channel LED controller using an external MOSFET
- Topologies: Boost, SEPIC, Flyback (controller with external FET)
- Dimming: Analog and PWM dimming support
- Switching frequency: Adjustable (see datasheet for limits and recommended ranges)
- Input voltage: Wide input range suitable for automotive battery systems (see datasheet)
- EMI features: Designed for low EMI; optional spread‑spectrum capability (see datasheet)
- Protection features: Undervoltage lockout (UVLO), overvoltage protection (OVP), current limit, thermal shutdown (see datasheet)
Note: Specific numeric values for switching frequency limits, input voltage range, and protection thresholds are not provided here—refer to the official datasheet for design‑in limits and equations.
Mechanical and packaging details
- Package/case: HTSSOP‑16 (PWP) with exposed PowerPAD
- Pin count: 16
- Mounting: Surface mount (SMT)
- Thermal: PowerPAD provides a direct thermal path to PCB copper for improved heat dissipation
- Packaging options:
- TPS92691QPWPTQ1: Cut Tape / small reel
- TPS92691QPWPRQ1: Standard tape‑and‑reel
Operating conditions
- Input voltage range: Wide range for automotive batteries (see datasheet)
- Ambient/operating temperature: Not specified in provided data; consult datasheet
- Switching frequency range: Adjustable; refer to datasheet for valid range and component selection guidance
Topologies and dimming
Boost, SEPIC, and flyback—choose the best match
- Boost: Ideal when the LED string forward voltage exceeds the minimum vehicle input. Provides straightforward, non‑isolated operation and high efficiency for headlamps and DRLs when input undervoltage must be accommodated.
- SEPIC: Useful when the LED string voltage may be either above or below the input, or when tighter input/output decoupling is desired. SEPIC can ease handling of wide battery transients without losing regulation at low input or overvoltage conditions.
- Flyback: Enables isolation or higher voltage conversion ratios, useful for multi‑string designs or when isolation is mandated by system requirements.
The controller’s external FET architecture lets you select MOSFETs and magnetics sized to your target current and thermal envelope, and to adjust switching frequency to balance efficiency, size, and EMI.
Analog and PWM dimming
- Analog dimming: Adjusts LED current in a continuous manner for fine control of brightness and thermal management.
- PWM dimming: Provides wide dynamic range, excellent color stability for white LEDs, and compatibility with automotive lighting control strategies. The TPS92691QPWPTQ1 supports PWM dimming via control pins as described in the datasheet.
Combining analog bias with high‑ratio PWM dimming allows stable color characteristics while achieving deep dimming for scenarios like DRLs transitioning to headlamp operation or ambient lighting scenes.
EMI and protection features
Designed for low EMI
- Optional spread‑spectrum features can help spread switching energy and reduce peak emissions (implementation details in the datasheet).
- Flexible switching frequency selection aids in placing harmonics between sensitive AM or other bands.
- External FET and magnetics selection enable optimization for gate charge, switching loss, and layout‑driven EMI improvements.
Comprehensive protection
- UVLO (undervoltage lockout) for predictable start‑up and brownout handling.
- OVP (overvoltage protection) to protect LEDs and power stage components during open‑LED or transient conditions.
- Current limiting for inductor/MOSFET protection.
- Thermal shutdown for self‑protection under fault or high‑ambient scenarios.
Protection thresholds and filter recommendations are application‑dependent; see the datasheet for exact limits and design equations.
Applications
- Automotive headlamps and daytime running lights (DRLs)
- Rear combination lamps (stop/turn/tail)
- Fog lamps and auxiliary exterior lighting
- Interior and exterior automotive LED lighting
These application areas benefit from the TPS92691QPWPTQ1’s single‑channel precision, flexible topologies, robust protections, and dimming options. When higher channel counts are needed, multiple controllers can be deployed per string or per function, allowing platform reuse and modular scaling.
Lifecycle, availability, and sourcing
- Lifecycle status: Active (per provided data; always verify on TI’s product page)
- Compliance: RoHS compliant, lead‑free; AEC‑Q100 qualified for automotive use
- Availability: Check Texas Instruments and authorized distributors for current stock
- Ordering options:
- TPS92691QPWPTQ1: HTSSOP‑16 (PWP) PowerPAD, Cut Tape / small reel
- TPS92691QPWPRQ1: Same device/package, standard tape‑and‑reel
For production builds, the packaging suffix matters for your automated assembly setup. Both orderable part numbers are the same silicon and package; select the suffix that matches your reel requirements.
Approved alternates and related devices
- TPS92691QPWPRQ1: Packaging variant of the same device (tape‑and‑reel). Electrical and mechanical compatibility is the same; only reel format differs.
- TPS92692‑Q1: Related family device. Review the datasheet for differences in features, limits, and pinout before substitution.
Policy note: Always evaluate alternates for electrical and mechanical compatibility, thermal performance, and software/firmware control needs across all operating conditions.
Compliance and reliability
- AEC‑Q100: Automotive qualification confirms device reliability under automotive stress testing.
- RoHS: Lead‑free, RoHS compliant for global environmental regulations.
- Environmental resilience: Designed for automotive use cases. Verify temperature range, derating, and transient immunity in the datasheet and per your OEM requirements.
Design‑in tips and integration notes
While final values and limits must be taken from the datasheet, these practical pointers can help smooth your first prototype spins with the Texas Instruments TPS92691QPWPTQ1:
- Thermal: Leverage the PowerPAD on the HTSSOP‑16 package. Tie the pad to a solid copper area with thermal vias to internal planes to keep junction temperatures controlled, especially at higher LED currents.
- Layout for EMI and stability: Keep high‑di/dt current loops tight, minimize switch‑node copper to reduce radiated noise, and place input bypass capacitors close to the power stage. Follow TI’s layout guidance for boost, SEPIC, or flyback specifically.
- Current sense and accuracy: Use low‑inductance shunts and short, Kelvin‑connected traces. Ensure adequate filtering where recommended to balance noise immunity and response time.
- Frequency planning: Select switching frequency to avoid sensitive bands and to hit your magnetics targets. Spread‑spectrum (if employed per datasheet) can help mitigate peak emissions.
- Transient handling: Automotive systems present cold‑crank and load‑dump events. Ensure your chosen topology, MOSFET, diode, and protection network meet system transient requirements. Validate with surge tests.
- Dimming strategy: Combine analog bias current adjustments with PWM dimming to achieve deep dimming while maintaining LED chromaticity. Pay attention to PWM frequency and duty cycle recommendations.
- Component selection: Choose MOSFETs, diodes, and magnetics with appropriate voltage/current ratings and thermal characteristics for your worst‑case conditions. Validate with thermal imaging.
These practices complement the device’s built‑in protections and help achieve robust performance in volume production.
Frequently asked questions (FAQs)
Q: What is the difference between TPS92691QPWPTQ1 and TPS92691QPWPRQ1?
A: They are the same silicon in the same HTSSOP‑16 (PWP) package. The suffix T indicates small reel (cut tape) and R indicates standard tape‑and‑reel packaging.
Q: Which power topologies does the TPS92691‑Q1 support?
A: It is a flexible LED controller that can be used in boost, SEPIC, and flyback configurations using external MOSFETs and magnetics. See the datasheet for design guidance.
Q: Is the device suitable for automotive applications?
A: Yes. It is AEC‑Q100 qualified (Q1 grade device) and intended for automotive LED lighting such as headlamps, DRL, and rear combination lamps.
Q: Does the TPS92691QPWPTQ1 integrate a switching MOSFET?
A: No. The controller drives an external MOSFET. This allows scaling of current and voltage capability by selecting suitable external components.
Q: What are the switching frequency limits and input voltage range?
A: They are application‑dependent and set by external components and configuration. Exact limits are not specified here—refer to the official datasheet for ranges, equations, and design examples.
Q: Is the package thermally enhanced?
A: Yes. The HTSSOP‑16 (PWP) package includes an exposed PowerPAD to improve thermal performance when properly soldered to the PCB.
Resources
- Product page: https://www.ti.com/product/TPS92691‑Q1
- Datasheet: https://www.ti.com/lit/ds/symlink/tps92691‑q1.pdf
Note: Always verify final design parameters, ratings, and application constraints in the official Texas Instruments datasheet and supporting application notes for the TPS92691‑Q1 family.