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Texas Instruments TPS92643QPWPRQ1
- Part No.:
- TPS92643QPWPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS92643QPWPRQ1.pdf
- Description:
- AUTOMOTIVE 3-A SYNCHRONOUS BUCK
- Quantity:
- Payment:
- Shipping:
Inventory:3,373
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Product details
Overview
TPS92643QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck LED driver delivering up to 3-A continuous LED current with ±4% accuracy, adaptive on-time current control, and 100 kHz–2.2 MHz programmable switching frequency. It operates from 5.5 V to 36 V input, supports load dump up to 40 V for 400 ms, and integrates fault diagnostics including LED short/open, cable harness fault, and thermal shutdown - deployed in headlight and front fog light modules.
For engineers reviewing the TPS92643QPWPRQ1 datasheet, TPS92643QPWPRQ1 pinout, TPS92643QPWPRQ1 application, or TPS92643QPWPRQ1 equivalent, key selection considerations include its 16-pin HTSSOP thermally enhanced package, valley-current-based adaptive on-time architecture, dual dimming (1000:1 PWM / 15:1 analog), integrated high- and low-side MOSFETs, and functional safety documentation support for ASIL-B system design.
Technical Context
The TPS92643QPWPRQ1 implements adaptive on-time average current mode control using inductor valley current detection, enabling near-constant switching frequency across wide VIN–VOUT ranges. Its rail-to-rail transconductance error amplifier (450 µA/V, 3-MHz GBW) closes the loop via CSP/CSN differential sensing, with IADJ-programmable reference (140 mV–2.4 V → 10 mV–175 mV sense threshold).
It integrates dual N-channel MOSFETs (RDS(ON-HS) = 65–130 mΩ, RDS(ON-LS) = 67–130 mΩ), a 5-V LDO bias regulator (4.75–5.25 V, ±200 mV UVLO hysteresis), internal 1.5-kHz ramp generator for APWM-to-PWM translation, and cycle-by-cycle overcurrent protection with 71-ns blanking time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5 V to 36 V; supports 40-V load dump for 400 ms - enables direct battery connection in 12-V/24-V automotive systems without external TVS. |
| LED Output Current | Up to 3 A continuous with ±4% accuracy over temperature, input, and output voltage - ensures stable luminance in headlight thermal cycling. |
| Switching Frequency | Programmable 100 kHz to 2.2 MHz via RON resistor - allows EMI optimization and compact magnetics selection. |
| Dimming Performance | 1000:1 precision PWM dimming and 15:1 linear analog dimming - meets stringent automotive dynamic lighting requirements. |
| Thermal Protection | Thermal shutdown at 175°C (typical) with 15°C hysteresis - prevents permanent damage during sustained overtemperature operation. |
| Fault Reporting | Open-drain FLT pin indicating LED short, open, cable harness fault, and thermal events - enables system-level diagnostics without additional logic. |
| AEC-Q100 Qualification | Grade 1 (–40°C to +125°C ambient), HBM H1C, CDM C5 - certified for under-hood automotive applications. |
Pinout & Package
TPS92643QPWPRQ1 is housed in a thermally enhanced 16-pin HTSSOP package (6.6 mm × 5.1 mm, 0.65-mm pitch) with exposed PowerPAD connected to AGND/PGND for optimal thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 SW | Switch node | Internally connects high- and low-side MOSFET drains; drives external power inductor - requires low-inductance layout to minimize switching loss and EMI. |
| 3 BST | Bootstrap supply input | Charges high-side gate driver via internal diode; requires ceramic capacitor (0.1–2.2 µF) between BST and SW - critical for reliable high-side FET turn-on. |
| 4 VCC | Bias supply output | 5-V regulated LDO output (4.75–5.25 V); powers internal circuitry and bootstrap - must be decoupled with 2.2–4.7 µF ceramic cap close to pin. |
| 5 IADJ | Analog current reference input | Sets LED current reference (10–175 mV) via 140 mV–2.4 V voltage; high-impedance input enables precise binning and thermal foldback when paired with NTC. |
| 6 COMP | Error amplifier output | Transconductance amplifier output requiring integral compensation network (capacitor to AGND) - determines loop stability and transient response. |
| 7 AGND | Analog ground | Reference return for internal voltage references and analog circuits; must be tied to PCB ground plane with multiple vias under PowerPAD. |
| 8 APWM | Analog-to-PWM dimming input | Accepts 1–2.45 V analog signal; internally compared to 1.5-kHz ramp to generate PWM duty cycle - enables smooth analog-controlled dimming. |
| 9 FLT | Fault indicator output | Open-drain active-low output signaling LED short/open, cable fault, or thermal shutdown - requires external pull-up to VCC for system monitoring. |
| 10 CSN | Negative current sense input | Connects to low-side of external RCS sense resistor; forms differential pair with CSP for valley-current detection - enables accurate closed-loop regulation. |
| 11 CSP | Positive current sense input | Connects to high-side of RCS; rail-to-rail input with 55 µA bias current - supports low-offset sensing with ceramic or aluminum capacitors. |
| 12 UDIM | UVLO & external PWM input | Configurable undervoltage lockout threshold (1.075–1.27 V) and accepts external PWM signal - enables system-level enable/disable and dimming control. |
| 13 RON | On-time programming pin | Resistor-to-VIN sets switching frequency per fSW = 1/(10×10⁻¹² × RON) - allows precise frequency tuning without external clock source. |
| 14,15 VIN | Main power input | High-current input (5.5–36 V) connecting to battery and bulk bypass caps; shortest possible path to PGND required for EMI suppression. |
| 16 PGND | Power ground | Return path for low-side MOSFET and input capacitors; must be bonded to AGND and PowerPAD - essential for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive on-time current control | Valley-current detection with inductor ripple-independent regulation - maintains ±4% LED current accuracy across input/output/temperature without output capacitor ESR dependency. |
| Integrated high- and low-side MOSFETs | RDS(ON-HS) = 65–130 mΩ and RDS(ON-LS) = 67–130 mΩ - eliminates external switch selection, reduces BOM count, and enables compact 3-A LED driver designs. |
| Dual dimming interface | Simultaneous APWM (1.5-kHz internal ramp) and UDIM (external PWM) inputs - supports both analog-controlled smooth dimming and digital pulse-width modulation in same design. |
| Comprehensive fault protection | Cycle-by-cycle overcurrent, LED short/open, cable harness fault, bootstrap UVLO, and thermal shutdown - reduces need for external monitoring ICs in ASIL-B systems. |
| Functional safety documentation | Available FIT rate, failure mode analysis, and diagnostic coverage reports - accelerates ISO 26262 ASIL-B compliance for automotive lighting subsystems. |
Applications
| Headlight Module | Front Fog Light System |
|---|---|
|
Use Scenario: High-brightness adaptive driving beam (ADB) headlight with dynamic zone control and thermal management. IC Role / Device Role / Timing Role: Primary synchronous buck LED driver regulating 3-A current for single-string high-power LEDs; provides real-time analog dimming via IADJ and fast PWM dimming via UDIM/APWM. Use Value: ±4% current accuracy ensures consistent lumen output across –40°C to +125°C ambient; 1000:1 PWM dimming enables precise ADB pixel intensity grading. |
Use Scenario: Compact, thermally constrained front fog light module requiring robust fault reporting and load dump immunity. IC Role / Device Role / Timing Role: Monolithic LED driver with integrated MOSFETs and open-drain FLT output for system-level fault flagging; operates from raw battery with 40-V/400-ms load dump tolerance. Use Value: HTSSOP PowerPAD enables >30 W dissipation in small footprint; LED short/open/cable fault detection eliminates need for external sense resistors or comparators. |
| Daytime Running Light (DRL) | Cornering Light Control Unit |
|
Use Scenario: Always-on DRL with gradual fade-in/fade-out and ambient temperature compensation. IC Role / Device Role / Timing Role: Analog dimming controller using IADJ with NTC biasing for automatic thermal foldback; leverages 15:1 linear dimming range and stable VCC LDO. Use Value: High-impedance IADJ input simplifies NTC integration; ±200 mV VCC UVLO hysteresis prevents flicker during cold-cranking voltage dips. |
Use Scenario: Low-latency cornering light activation triggered by steering angle and vehicle speed signals. IC Role / Device Role / Timing Role: Fast-response LED driver accepting external PWM (UDIM) with 105-ns falling delay and 245-ns rising delay - enables sub-millisecond dimming transitions. Use Value: Adaptive on-time control achieves <10-µs current settling time; cycle-by-cycle current limiting protects LEDs during rapid on/off cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409QMYX/NOPB | Non-synchronous buck controller (external high-side MOSFET); no integrated low-side switch; 100 kHz–1 MHz frequency range. | Lacks integrated MOSFETs and automotive qualification; requires external current sense amp and fault logic. | Choose for cost-sensitive non-automotive designs where board space and thermal constraints allow discrete FETs. |
| TPS92682QPWPRQ1 | Pin-compatible 4-A variant with identical HTSSOP-16 package, same pinout, and extended current capability; shares firmware and layout. | Supports higher-power headlight strings (up to 4 A) while maintaining identical fault reporting, dimming interfaces, and AEC-Q100 Grade 1 rating. | Choose when scaling luminance output without redesigning PCB or firmware - drop-in upgrade path with identical thermal and EMI behavior. |
Compared with LM3409QMYX/NOPB, TPS92643QPWPRQ1 delivers higher integration, automotive qualification, and tighter current accuracy; versus TPS92682QPWPRQ1, it offers optimized thermal performance at 3-A level with identical footprint and control architecture - enabling scalable platform design.
Availability
TPS92643QPWPRQ1 is available at Aetrix Electronics and suitable for automotive headlight modules, front fog light systems, and daytime running light (DRL) applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for TPS92643QPWPRQ1 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 over 50 years of automotive IC experience.
The TPS926xx-Q1 product line delivers monolithic synchronous buck LED drivers optimized for ASIL-B-compliant automotive exterior lighting - designed to replace discrete controllers and MOSFETs with integrated, thermally robust, and functionally safe alternatives.
FAQ
What is the maximum continuous LED current supported by the TPS92643QPWPRQ1?
The TPS92643QPWPRQ1 supports up to 3-A continuous LED current with better than ±4% accuracy over input voltage, output voltage, and ambient temperature (–40°C to +125°C). This specification is validated under recommended operating conditions with proper thermal management using the HTSSOP PowerPAD and PCB copper area.
Does the TPS92643QPWPRQ1 integrate both high-side and low-side power MOSFETs?
Yes, the TPS92643QPWPRQ1 integrates both high-side and low-side N-channel MOSFETs with typical RDS(ON) values of 65–130 mΩ each. This monolithic integration eliminates external switch selection, reduces layout complexity, and improves efficiency in space-constrained automotive LED driver designs.
How does the adaptive on-time control in the TPS92643QPWPRQ1 maintain switching frequency stability?
The TPS92643QPWPRQ1 uses adaptive on-time control where the one-shot timer duration is inversely proportional to VIN and directly proportional to VCSP. This results in near-constant switching frequency (100 kHz–2.2 MHz) across varying input/output conditions - calculated as fSW = 1/(10×10⁻¹² × RON) - without requiring an external oscillator.
Can the TPS92643QPWPRQ1 operate during automotive load dump events?
Yes, the TPS92643QPWPRQ1 supports 40-V input for up to 400 ms, meeting ISO 7637-2 and SAE J1113-11 load dump requirements. Its 36-V absolute maximum VIN rating and robust internal protection ensure uninterrupted operation during transient overvoltage events in 12-V and 24-V automotive systems.
What dimming methods does the TPS92643QPWPRQ1 support, and what are their respective ranges?
The TPS92643QPWPRQ1 supports two independent dimming methods: 1000:1 precision PWM dimming via UDIM or APWM pins, and 15:1 linear analog dimming via the IADJ pin (140 mV–2.4 V input → 10 mV–175 mV sense threshold). Both interfaces can be used simultaneously for hybrid dimming schemes.
TPS92643QPWPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 5.5V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- -
- Current - Output / Channel:
- 3A
- Frequency:
- 100kHz ~ 2.2MHz
- Dimming:
- Analog, PWM
- Applications:
- LED Lighting
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
TPS92643QPWPRQ1 FAQ
1.How can I place an order for TPS92643QPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92643QPWPRQ1 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 TPS92643QPWPRQ1 reliable?
The price and inventory of TPS92643QPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92643QPWPRQ1 is usually 5 days.
3.What payment methods are accepted for TPS92643QPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92643QPWPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92643QPWPRQ1?
TPS92643QPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92643QPWPRQ1 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 TPS92643QPWPRQ1?
For technical support, including TPS92643QPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92643QPWPRQ1 requirements.
6.How does Aetrix verify that TPS92643QPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS92643QPWPRQ1 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 TPS92643QPWPRQ1 meets industry standards.
7.What is the process for return or replacement of TPS92643QPWPRQ1?
All TPS92643QPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS92643QPWPRQ1, 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 TPS92643QPWPRQ1 part is unused and in its original packaging.
Return procedure for TPS92643QPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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