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Texas Instruments TPS92642QPWPRQ1
- Part No.:
- TPS92642QPWPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS92642QPWPRQ1.pdf
- Description:
- TPS92642QPWPRQ1
- Quantity:
- Payment:
- Shipping:
Inventory:1,996
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Product details
Overview
TPS92642QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck LED driver for infrared illumination, delivering up to 5-A pulsed output current with ±4% accuracy, 100 kHz–2.2 MHz programmable switching frequency, and adaptive on-time valley-current control. It operates from 5.5 V to 36 V input and supports load dump up to 400 ms at 40 V, targeting Driver Monitoring Systems (DMS) and IR laser driver applications.
For engineers reviewing the TPS92642QPWPRQ1 datasheet, TPS92642QPWPRQ1 pinout, TPS92642QPWPRQ1 application, or TPS92642QPWPRQ1 equivalent, key selection considerations include its integrated high- and low-side MOSFETs, 16-pin HTSSOP thermal package, fault diagnostics (LED short/open, cable harness, thermal shutdown), and dual dimming support (1000:1 PWM, 15:1 analog) with pulse duty cycle limiting.
Technical Context
The TPS92642QPWPRQ1 implements adaptive on-time average current mode control using inductor valley current detection via differential sense inputs (CSP/CSN), enabling near-constant switching frequency across input/output conditions. Its rail-to-rail error amplifier sets a 175-mV typical current-sense threshold referenced to IADJ voltage, achieving closed-loop regulation with integral compensation on the COMP pin.
It integrates functional safety documentation support, cycle-by-cycle overcurrent protection for both high-side (8.6 A typ) and low-side (3.2 A typ) FETs, and a dedicated PLMT pin to enforce a fixed 13.6% maximum PWM duty cycle via external capacitor timing. The device uses internal bootstrap charging (BST-SW) with UVLO (3.4 V) and features open-drain FLT output for fault reporting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5 V to 36 V; supports automotive load dump up to 40 V for 400 ms without damage. |
| Pulsed Output Current | Up to 5 A with ±4% accuracy over temperature, input, and output voltage variations. |
| Switching Frequency | Programmable from 100 kHz to 2.2 MHz via RON resistor; enables EMI optimization and compact magnetics. |
| Dimming Capability | 1000:1 precision PWM dimming and 15:1 linear analog dimming via IADJ voltage (140 mV–2.4 V). |
| Fault Protection | Cycle-by-cycle switch overcurrent, LED short/open, cable harness fault, thermal shutdown (175°C), and BST UVLO. |
| Package | 16-pin HTSSOP (6.6 mm × 5.1 mm) with PowerPAD; RθJA = 38.9°C/W for thermally demanding DMS modules. |
| AEC-Q100 Qualification | Grade 1 (–40°C to +125°C ambient), HBM H1C, CDM C5 - certified for front-facing automotive vision systems. |
Pinout & Package
The TPS92642QPWPRQ1 is housed in a thermally enhanced 16-pin HTSSOP package (6.6 mm × 5.1 mm) with exposed PowerPAD connected to AGND/PGND for optimal thermal dissipation. The PowerPAD must be soldered to PCB ground plane using multiple vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 SW | Switch node | Internally connects high- and low-side MOSFET drains; ties to power inductor; requires low-inductance layout. |
| 3 BST | Bootstrap supply | Charges high-side gate driver via internal diode; requires 33–100 nF ceramic cap between BST and SW. |
| 4 VCC | Bias regulator output | 5-V regulated supply (±2.5%) for internal circuitry; decouple with 2.2–4.7 µF ceramic cap to AGND. |
| 5 IADJ | Analog current reference | Sets LED current reference (10–175 mV) via 140 mV–2.4 V input; enables precise binning and thermal derating. |
| 6 COMP | Error amplifier output | Drives integral compensation network (capacitor to AGND); controls valley current threshold for stability. |
| 7 AGND | Analog ground | Reference for internal voltage references and analog circuits; must connect to PowerPAD and system AGND. |
| 8 PLMT | Pulse limit timing | External capacitor sets minimum PWM period; enforces 13.6% max duty cycle; disable by grounding. |
| 9 FLT | Fault indicator | Open-drain output signaling LED short/open, cable fault, or thermal shutdown; pull-up required to VCC. |
| 10 CSN | Current sense (–) | Negative input of rail-to-rail transconductance amplifier; connects directly to RCS low-side terminal. |
| 11 CSP | Current sense (+) | Positive input of rail-to-rail transconductance amplifier; connects directly to RCS high-side terminal. |
| 12 UDIM | PWM dimming / UVLO | Accepts external PWM signal for dimming; also configures input undervoltage lockout via resistor divider. |
| 13 RON | On-time programming | Resistor to VIN sets switching frequency per fSW = 1/(10×10⁻¹² × RON); enables fixed-frequency operation. |
| 14,15 VIN | Main power input | High-voltage input (5.5–36 V); connects to bulk capacitors; shortest possible path to PGND critical. |
| 16 PGND | Power ground | Return for low-side MOSFETs and input capacitors; must connect to PowerPAD and system PGND plane. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive on-time valley-current control | Maintains near-constant frequency while enabling fast transient response for pulsed IR illumination in DMS. |
| Integrated high- and low-side N-channel MOSFETs | Eliminates external switches; RDS(ON-HS) = 130 mΩ max, RDS(ON-LS) = 130 mΩ max at TJ = 125°C. |
| Dual precision dimming interface | Simultaneous 1000:1 PWM (via UDIM) and 15:1 analog (via IADJ) control for flexible illumination profiling. |
| Comprehensive fault diagnostics | Single-pin FLT output reports LED short, open, cable harness fault, and thermal shutdown with hiccup retry. |
| Automotive-grade thermal design | HTSSOP PowerPAD package delivers RθJB = 19.9°C/W; supports continuous 5-A pulses in 125°C ambient. |
| Functional safety documentation support | Includes FIT rate data, failure mode analysis, and diagnostic coverage guidance for ISO 26262 ASIL-B systems. |
Applications
| Driver Monitoring System (DMS) | In-Cabin IR Illumination |
|---|---|
|
Use Scenario: Real-time eye/gaze tracking in automotive cabins using pulsed 850-nm or 940-nm IR LEDs. IC Role / Device Role / Timing Role: Synchronous buck controller regulating pulsed LED current with sub-10-µs minimum PWM width and 13.6% max duty cycle enforcement. Use Value: Enables high-fidelity image capture under varying ambient light while minimizing power and thermal load during active sensing bursts. |
Use Scenario: Occupant detection and classification using structured IR illumination patterns synchronized with camera exposure. IC Role / Device Role / Timing Role: Precision current source with 15:1 analog dimming range for dynamic brightness adjustment across cabin zones. Use Value: Maintains consistent irradiance across temperature (-40°C to 125°C) and battery voltage (9–16 V), ensuring reliable AI inference. |
| Automotive Night Vision Assist | Laser-Based LiDAR Illumination |
|
Use Scenario: Long-range IR flood illumination for forward-facing night vision cameras in ADAS platforms. IC Role / Device Role / Timing Role: High-efficiency buck driver powering multi-string IR LED arrays with 36-V input tolerance for 24-V truck/bus systems. Use Value: Survives 40-V/400-ms load dump events without latch-off, meeting OEM robustness requirements for chassis-grounded systems. |
Use Scenario: Pulsed laser diode driver for short-pulse time-of-flight (ToF) sensing in next-gen in-cabin LiDAR. IC Role / Device Role / Timing Role: Fast-response current modulator with <65-ns valley comparator delay and programmable switching frequency up to 2.2 MHz. Use Value: Supports precise pulse shaping for sub-centimeter depth resolution while maintaining ±4% current accuracy across pulse trains. |
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 |
|---|---|---|---|
| LM3409QMHX/NOPB | Non-synchronous buck controller; external high-side MOSFET required; no integrated PLMT or analog dimming. | Lacks pulse duty cycle limiting and 15:1 analog dimming; suited for simpler constant-current IR lighting. | Choose when cost sensitivity outweighs need for integrated diagnostics and advanced dimming in DMS. |
| TPS92630QPWPRQ1 | Three-channel independent buck LED driver; lower per-channel current (1.5 A); no PLMT or UDIM-based pulse limiting. | Designed for multi-zone RGB+IR lighting; lacks single-string 5-A capability and pulse timing enforcement. | Prefer for distributed illumination architectures requiring independent channel control over high-power single-string pulsing. |
Compared with LM3409QMHX/NOPB and TPS92630QPWPRQ1, the TPS92642QPWPRQ1 uniquely combines 5-A pulsed current, integrated pulse limiting, dual dimming, and AEC-Q100 Grade 1 qualification in a single-channel architecture optimized for DMS-grade IR illumination.
Availability
TPS92642QPWPRQ1 is available at Aetrix Electronics and suitable for automotive Driver Monitoring Systems (DMS), in-cabin IR illumination modules, and night vision assist systems requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for TPS92642QPWPRQ1 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 ICs, with decades of automotive qualification expertise and broad AEC-Q100 portfolio coverage.
The TPS92642QPWPRQ1 belongs to TI's automotive LED driver product line, engineered specifically for high-reliability, high-accuracy pulsed IR illumination in driver monitoring and occupant sensing systems.
FAQ
What is the maximum pulsed output current supported by the TPS92642QPWPRQ1?
The TPS92642QPWPRQ1 supports up to 5-A pulsed output current with better than ±4% accuracy across input voltage (5.5 V–36 V), output voltage, and ambient temperature (–40°C to +125°C). This rating applies to pulses shorter than 4 ms and assumes proper thermal management via the HTSSOP PowerPAD and PCB layout.
How does the TPS92642QPWPRQ1 implement PWM dimming with duty cycle limiting?
The TPS92642QPWPRQ1 accepts external PWM signals on the UDIM pin and enforces a maximum duty cycle of 13.6% (typical) using the internal pulse generator circuit. The PLMT pin sets the minimum allowed PWM period via an external capacitor; if PLMT is grounded, the limit is disabled. This ensures safe thermal operation during high-brightness IR bursts in DMS.
Can the TPS92642QPWPRQ1 operate with ceramic output capacitors only?
Yes, the TPS92642QPWPRQ1 is explicitly designed to be stable with any combination of ceramic or aluminum electrolytic output capacitors. Its adaptive on-time control and low-offset current sense amplifier eliminate ESR dependency, making it compatible with low-ESR multilayer ceramic capacitors (MLCCs) commonly used in space-constrained automotive modules.
What fault conditions does the FLT pin report on the TPS92642QPWPRQ1?
The open-drain FLT pin on the TPS92642QPWPRQ1 reports LED short circuit, LED open circuit, cable harness fault, thermal shutdown (175°C), and bootstrap undervoltage. It asserts low during fault conditions and supports hiccup-mode retry with a 5.5-ms delay between attempts, enabling robust system-level fault recovery without host intervention.
Is the TPS92642QPWPRQ1 pin-compatible with other devices in the TPS926xx-Q1 family?
No, the TPS92642QPWPRQ1 is not pin-compatible with other TPS926xx-Q1 devices such as TPS92630QPWPRQ1 or TPS92692QPWPRQ1. Its 16-pin HTSSOP pinout is unique, with dedicated PLMT, IADJ, and dual CSP/CSN sense inputs not shared across the family. Board redesign is required for substitution.
TPS92642QPWPRQ1 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:
- 5A
- Frequency:
- 100kHz ~ 2.2MHz
- Dimming:
- Analog, PWM
- Applications:
- General Purpose
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
TPS92642QPWPRQ1 FAQ
1.How can I place an order for TPS92642QPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92642QPWPRQ1 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 TPS92642QPWPRQ1 reliable?
The price and inventory of TPS92642QPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92642QPWPRQ1 is usually 5 days.
3.What payment methods are accepted for TPS92642QPWPRQ1?
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TPS92642QPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92642QPWPRQ1 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 TPS92642QPWPRQ1?
For technical support, including TPS92642QPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92642QPWPRQ1 requirements.
6.How does Aetrix verify that TPS92642QPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS92642QPWPRQ1 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 TPS92642QPWPRQ1 meets industry standards.
7.What is the process for return or replacement of TPS92642QPWPRQ1?
All TPS92642QPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS92642QPWPRQ1, 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 TPS92642QPWPRQ1 part is unused and in its original packaging.
Return procedure for TPS92642QPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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