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Texas Instruments TPS92518QPWPRQ1
- Part No.:
- TPS92518QPWPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS92518QPWPRQ1.pdf
- Description:
- IC LED DRIVER CTRLR PWM 24HTSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS92518QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive dual-channel buck LED controller with SPI interface, supporting 6.5 V to 42 V input, quasi-hysteretic control, and independent PWM/analog dimming per channel. It delivers up to 425 mA per channel with 10,000:1 PWM dimming range and enables shunt FET dimming for adaptive matrix headlamps.
For engineers reviewing the TPS92518QPWPRQ1 datasheet, TPS92518QPWPRQ1 pinout, TPS92518QPWPRQ1 application, or TPS92518QPWPRQ1 equivalent, key selection criteria include its dual-channel independent current regulation, SPI-configurable peak current (245–265 mV), controlled off-time (3.2–4.8 µs at VLED=30 V), thermal shutdown at 175°C, and HTSSOP-24 package with exposed thermal pad.
Technical Context
The TPS92518QPWPRQ1 implements quasi-hysteretic peak-current control with digitally programmable analog thresholds via SPI-specifically LEDx_PKTH_DAC (8-bit), LEDx_TOFF_DAC (8-bit), and LEDx_MAXOFF_DAC (8-bit). Each channel features cycle-by-cycle current limiting, leading-edge blanking (165–235 ns), and high-side differential current sensing with 10:1 internal divider.
Its controlled off-time architecture dynamically adjusts switching frequency (1 kHz–2 MHz) based on VLEDx voltage to maintain constant inductor ripple (ΔIL-PP), enabling stable operation across varying LED string voltages without external loop compensation. Fault reporting includes thermal warning, overtemperature shutdown (175°C), and SPI-monitored UVLO, EN/UV, and gate drive errors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6.5 V to 42 V - supports direct battery connection in 12 V/24 V automotive systems without pre-regulation |
| Peak Current Threshold | 245–265 mV (at DAC=255) - sets maximum inductor current per channel; adjustable down to 10 mV for low-current operation |
| Controlled Off-Time | 3.2–4.8 µs (at VLED=30 V, DAC=255) - determines switching frequency and inductor ripple; scales inversely with VLEDx |
| PWM Dimming Range | 10,000:1 - enables ultra-fine brightness control in safety-critical automotive lighting (e.g., AFS, DRL) |
| Operating Ambient Temp | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and headlamp module placement |
| Junction Temp Limit | 150°C max - sustained operation allowed within thermal design margin before shutdown at 175°C |
| SPI Interface Speed | 2 MHz max clock (500 ns period) - supports fast register updates for real-time dimming and fault response |
Pinout & Package
TPS92518QPWPRQ1 is housed in a thermally enhanced HTSSOP-24 package (7.7 mm × 4.4 mm) with exposed thermal pad connected to GND for PCB-level heat dissipation. Pin functions are validated per TI SLUSCZ1 datasheet (May 2017), including dual-channel bootstrap, sense, gate drive, and SPI I/O.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power supply input | Accepts 6.5–42 V; powers internal LDOs and gate drivers; may be shared with CSPx inputs |
| CSP1/CSN1 (Pins 2/3) | Channel 1 high-side current sense differential pair | Measures LED current via external sense resistor; 10:1 internal divider enables low-loss sensing |
| GATE1/SW1/BOOT1 (Pins 4/5/6) | Channel 1 synchronous buck gate drive path | GATE1 drives external high-side N-FET; SW1 connects to switch node; BOOT1 supplies floating gate voltage |
| VCC1 (Pin 7) | Channel 1 auxiliary LDO output | 7.5 V ±0.6 V regulated output; powers low-current external circuitry (e.g., level shifters, bias networks) |
| GND (Pin 8) | System ground reference | Common return for power, sense, and logic; exposed thermal pad must be soldered to GND plane |
| VLED1/PWM1 (Pins 9/10) | Channel 1 output voltage sense / PWM dimming input | VLED1 monitors LED string voltage for off-time scaling; PWM1 accepts 0–5 V logic for high-frequency dimming |
| SSN/SCK/MOSI/MISO (Pins 11–14) | SPI slave interface | Full-duplex 4-wire SPI for configuring registers, reading ADC values (VLEDx, die temp), and fault status |
| EN/UV (Pin 24) | Global enable / UVLO override | Active-high enable; rising threshold 1.24 V (standard mode) or 23.4 V (SPI-bypass mode) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck controllers | Enables separate current regulation for asymmetric LED strings (e.g., high-beam + DRL) without cross-talk |
| Quasi-hysteretic control with COFT | Eliminates need for external compensation; maintains stable CCM/DCM operation across wide VLEDx range (1–60 V) |
| SPI-configurable 8-bit DACs | Allows runtime adjustment of peak current, off-time, and max off-time-enabling one BOM for multiple LED configurations |
| High-frequency shunt FET dimming | Uses programmable max off-time to synchronize external shunt FETs for flicker-free, high-PWM-ratio dimming in matrix headlamps |
| AEC-Q100 Grade 1 qualification | Validated for automotive ambient temperatures (–40°C to +125°C) and ESD robustness (HBM ±2 kV, CDM ±750 V) |
Applications
| Adaptive Front-Lighting Systems (AFS) | Automotive Daytime Running Lights (DRL) |
|---|---|
Use Scenario: Dynamic beam shaping using pixelated LED arrays where individual segments require independent current control and synchronized dimming. IC Role / Device Role / Timing Role: Dual-channel buck controller providing precise, isolated current regulation per LED string; SPI enables real-time reconfiguration of dimming profiles and fault masking. Use Value: Enables <1% current matching between channels and 10,000:1 dimming resolution-critical for glare-free adaptive beam patterns. | Use Scenario: High-reliability, thermally constrained LED modules mounted on vehicle front fascia with ambient temperature cycling. IC Role / Device Role / Timing Role: Constant-current driver with integrated thermal monitoring and UVLO; operates directly from 12 V battery with no intermediate DC/DC stage. Use Value: Delivers >92% efficiency at 425 mA (per channel) while maintaining ±3% current accuracy over –40°C to +125°C ambient. |
| Switched Matrix Headlamps | Automotive Turn/Position Lights |
Use Scenario: High-speed switching of multiple LED strings to create animated turn signals or dynamic cornering lights. IC Role / Device Role / Timing Role: Dual-channel controller with <105 ns PWM propagation delay and programmable max off-time for precise shunt FET timing alignment. Use Value: Supports <500 ns inter-channel timing skew-enabling synchronized multi-string modulation without visible artifacts. | Use Scenario: Compact, cost-sensitive LED modules requiring robust operation in vibration-prone locations (e.g., side mirrors, rear lamps). IC Role / Device Role / Timing Role: Integrated buck controller with cycle-by-cycle current limit and thermal shutdown-reducing external protection components. Use Value: Eliminates need for discrete current-sense amplifiers and thermal sensors; reduces BOM count by ≥4 components per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel automotive LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS92612QPWPRQ1 | Single-channel, integrated high-side switch (no external FET required); lower input voltage (4.5–42 V); no SPI interface | Better suited for space-constrained single-string designs; lacks channel independence and digital configurability | Select when board area is critical and only one LED string is needed; not suitable for matrix or dual-string AFS. |
| MAX20051ATG/V+T | Dual-channel, SPI-controlled, but uses voltage-mode control; fixed 2.2 MHz switching; no shunt FET timing support | Targeted at general automotive lighting; lacks programmable max off-time and high-frequency shunt dimming capability | Choose for simpler, fixed-frequency designs where adaptive dimming is not required; less flexible for AFS/matrix use cases. |
Compared with TPS92518QPWPRQ1, TPS92612QPWPRQ1 trades channel count and configurability for integration and footprint reduction, while MAX20051ATG/V+T offers deterministic frequency but sacrifices dynamic off-time scaling and shunt FET synchronization-making TPS92518QPWPRQ1 uniquely suited for adaptive, high-resolution LED headlamp systems.
Availability
TPS92518QPWPRQ1 is available at Aetrix Electronics and suitable for automotive LED headlamps, adaptive front-lighting systems (AFS), and switched matrix lighting requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for TPS92518QPWPRQ1 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 power management portfolio.
The TPS92518QPWPRQ1 belongs to TI's automotive LED controller product line, designed specifically for high-performance, safety-critical exterior lighting-including adaptive driving beams, matrix headlamps, and dynamic DRL systems.
FAQ
What is the maximum input voltage supported by the TPS92518QPWPRQ1?
The TPS92518QPWPRQ1 supports a maximum input voltage of 42 V, as specified in its Recommended Operating Conditions. This rating allows direct connection to 24 V nominal automotive battery systems with transient tolerance, and is distinct from the higher-voltage TPS92518HV-Q1 variant (65 V max). Operation above 42 V risks permanent damage per Absolute Maximum Ratings.
How does the TPS92518QPWPRQ1 achieve 10,000:1 PWM dimming range?
The TPS92518QPWPRQ1 achieves 10,000:1 PWM dimming through dedicated high-speed PWM inputs (PWM1/PWM2) with sub-100 ns propagation delay and internal timing circuitry that synchronizes shunt FET control with the converter's maximum off-time register. This eliminates low-frequency artifacts and enables precise duty-cycle control down to 0.01%, validated across –40°C to +125°C ambient.
Can the TPS92518QPWPRQ1 operate without SPI configuration?
Yes-the TPS92518QPWPRQ1 can operate without SPI initialization by asserting EN/UV above 23.4 V, which bypasses SPI communication and loads factory-default register values (e.g., LEDx_PKTH_DAC = 127, LEDx_TOFF_DAC = 255). However, full functionality-including analog dimming, fault reporting, and thermal monitoring-requires SPI access to configure and read registers.
What thermal management provisions does the TPS92518QPWPRQ1 include?
The TPS92518QPWPRQ1 integrates junction temperature monitoring via on-die ADC (VTHERM register), thermal warning flag activation at 150°C, and hard shutdown at 175°C. Its HTSSOP-24 package features an exposed thermal pad requiring ≥6 thermal vias to inner GND planes, achieving RθJB = 15.7°C/W-enabling 425 mA/channel operation at +125°C ambient with proper PCB layout.
Is the TPS92518QPWPRQ1 pin-compatible with any other TI LED controllers?
No-the TPS92518QPWPRQ1 is not pin-compatible with other TI LED controllers. Its 24-pin HTSSOP layout, dual-channel gate drive assignment (GATE1/GATE2), and dedicated SPI interface pins (SSN/SCK/MOSI/MISO) are unique to this device family. Migration to alternatives like TPS92612QPWPRQ1 requires PCB redesign due to differing pin count, function mapping, and integration level.
TPS92518QPWPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- No
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 6.5V
- Voltage - Supply (Max):
- 42V
- Voltage - Output:
- 39V
- Current - Output / Channel:
- -
- Frequency:
- 2MHz
- Dimming:
- Analog, PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-HTSSOP
TPS92518QPWPRQ1 FAQ
1.How can I place an order for TPS92518QPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92518QPWPRQ1 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 TPS92518QPWPRQ1 reliable?
The price and inventory of TPS92518QPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92518QPWPRQ1 is usually 5 days.
3.What payment methods are accepted for TPS92518QPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92518QPWPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92518QPWPRQ1?
TPS92518QPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92518QPWPRQ1 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 TPS92518QPWPRQ1?
For technical support, including TPS92518QPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92518QPWPRQ1 requirements.
6.How does Aetrix verify that TPS92518QPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS92518QPWPRQ1 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 TPS92518QPWPRQ1 meets industry standards.
7.What is the process for return or replacement of TPS92518QPWPRQ1?
All TPS92518QPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS92518QPWPRQ1, 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 TPS92518QPWPRQ1 part is unused and in its original packaging.
Return procedure for TPS92518QPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS92518QPWPRQ1 Tags
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