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Texas Instruments TPS92518QPWPTQ1
- Part No.:
- TPS92518QPWPTQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS92518QPWPTQ1.pdf
- Description:
- IC LED DRIVER CTRLR PWM 24HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:225
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Product details
Overview
TPS92518QPWPTQ1 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 - used in adaptive front lighting systems (AFS) and matrix headlamps requiring precise current regulation and high-frequency shunt FET dimming.
For engineers reviewing the TPS92518QPWPTQ1 datasheet, TPS92518QPWPTQ1 pinout, TPS92518QPWPTQ1 application, or TPS92518QPWPTQ1 equivalent, key selection criteria include its dual-channel peak-current-controlled buck architecture, 10,000:1 PWM dimming range, SPI-configurable off-time and peak current thresholds, and HTSSOP-24 thermal performance for under-hood LED driver modules.
Technical Context
The TPS92518QPWPTQ1 implements a quasi-hysteretic, constant off-time (µs·V) control architecture where each channel's switching frequency dynamically adjusts between 1 kHz and 2 MHz based on VLEDx voltage and LEDx_TOFF_DAC register value - enabling stable operation across wide output voltage ranges without external loop compensation. Its cycle-by-cycle current limiting and leading-edge blanking (200 ns typ.) ensure robustness against transient overloads.
SPI interface provides full digital configurability of eight-bit DAC registers for peak current threshold (255 mV max), controlled off-time (4.1 µs typ. at VLEDx = 30 V), maximum off-time (65 µs max), and ADC-based temperature/voltage monitoring - all with fault reporting including thermal shutdown (175°C) and boot UVLO (4.4 V typ.).
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. |
| Operating Ambient Temp | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood placement. |
| PWM Dimming Range | 10,000:1 - enables ultra-fine brightness control in DRL and adaptive beam shaping. |
| Analog Dimming Range | 255:1 - achieved via software-adjustable peak current threshold DAC (0–255 code). |
| Switching Frequency Range | 1 kHz to 2 MHz - dynamically set by VLEDx and LEDx_TOFF_DAC; no external frequency programming required. |
| Junction Temp Limit | 150°C max - with thermal shutdown at 175°C and 10°C hysteresis for safe derating. |
| Package Thermal Resistance | RθJA = 32.5°C/W - HTSSOP-24 package enables >2 W dissipation with standard PCB copper. |
Pinout & Package
TPS92518QPWPTQ1 is housed in a thermally enhanced 24-pin HTSSOP (PWP) package measuring 7.7 mm × 4.4 mm with exposed thermal pad connected to GND for optimal heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 6.5–42 V supply; powers internal LDOs and gate drivers - must be decoupled near pin. |
| CSP1 / CSN1 CSP2 / CSN2 | Differential current sense inputs | High-side sensing across RSENSE; 255 mV full-scale threshold sets LED current - enables accurate ±1% current regulation. |
| GATE1 / GATE2 | High-side N-channel FET gate drivers | 7.5 V nominal output with 2.8 Ω low-side RDS(on); drives external MOSFETs directly without level shifters. |
| BOOT1 / BOOT2 | Bootstrap supply inputs | Charge pump inputs for high-side gate drive; require 0.1 µF ceramic capacitor to SWx node per channel. |
| VLED1 / VLED2 | Output voltage sense inputs | Programmable off-time reference - voltage determines µs·V timing; critical for ripple stability and frequency control. |
| PWM1 / PWM2 | Dedicated dimming inputs | Direct TTL-compatible PWM control (1.8 V VIH); 105 ns max delay ensures sub-microsecond dimming response. |
| SCK / MOSI / MISO / SSN | SPI interface signals | Full-duplex 4-wire SPI (500 ns min. SCK period); supports daisy-chaining multiple TPS92518QPWPTQ1 devices on one bus. |
| EN/UV | Enable / UVLO input | Two-mode function: 1.24 V enable threshold for logic control; 23.4 V override for default-register startup bypassing SPI initialization. |
Key Features
| Feature | Design Value |
|---|---|
| Quasi-hysteretic control | Enables >1 MHz switching without compensation components while maintaining cycle-by-cycle current limit and fast load transient response. |
| SPI-configurable DACs | Eight-bit registers for peak current, off-time, max off-time, and ADC calibration - allow single hardware design to support multiple LED string configurations. |
| High-frequency shunt FET dimming | Supported via programmable max off-time (65 µs) and dedicated PWM inputs - eliminates visible flicker in AFS matrix scanning at >1 kHz. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient with HBM ±2 kV / CDM ±750 V ESD protection - suitable for safety-critical exterior lighting. |
| Integrated VCC regulators | VCC1/VCC2 outputs (7.5 V typ., 38 mA limit) power external bias circuits or gate drivers - reduce BOM count and improve system integration. |
Applications
| Adaptive Front Lighting System (AFS) | Matrix LED Headlamp |
|---|---|
Use Scenario: Dynamic beam steering and selective pixel blanking in automotive headlamps using individually addressable LED segments. IC Role / Device Role / Timing Role: Dual-channel buck controller regulating two independent LED strings with synchronized PWM dimming and real-time SPI reconfiguration. Use Value: Enables <100 µs channel-to-channel dimming skew and <5% current matching - critical for seamless beam shaping without halo artifacts. | Use Scenario: High-resolution headlamp arrays with >100 LEDs per side, requiring rapid on/off sequencing and thermal-aware current scaling. IC Role / Device Role / Timing Role: Primary current regulator with shunt-FET dimming support via programmable max off-time and analog dimming DACs. Use Value: Achieves 10,000:1 dimming depth and <200 ns PWM edge delay - eliminates strobing during high-speed matrix scanning. |
| Daytime Running Light (DRL) | Automotive Turn Signal / Position Light |
Use Scenario: Constant-brightness white LED arrays operating continuously at ambient temperatures up to 125°C. IC Role / Device Role / Timing Role: Dual-channel constant-current source with integrated thermal monitoring and fault reporting via SPI. Use Value: Maintains ±3% current accuracy over temperature using on-die ADC and DAC calibration - ensures consistent luminance and regulatory compliance. | Use Scenario: Fast-flashing amber LED clusters requiring precise duty-cycle control and thermal derating during extended operation. IC Role / Device Role / Timing Role: Independent channel control with PWM dimming input and EN/UV logic enable for flash pattern synchronization. Use Value: Supports 1–20 Hz flash rates with <1% duty-cycle error via software-tuned off-time registers - meets UNECE R148 photometric requirements. |
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 |
|---|---|---|---|
| TPS92518HVQPWPTQ1 | Higher VIN rating (6.5–65 V) with identical pinout, SPI interface, and feature set - differs only in absolute max input voltage and CSPx UVLO thresholds. | Required for 48 V architectures or boost-fed systems; not suitable for 12 V/24 V direct-battery designs due to higher UVLO thresholds. | Select TPS92518HVQPWPTQ1 only when input exceeds 42 V; otherwise TPS92518QPWPTQ1 offers tighter parameter tolerances at lower cost. |
| LM3423QMHX/NOPB | Single-channel, analog-only dimming (no SPI), no integrated VCC regulators, and no shunt-FET dimming support - uses external op-amp current sense. | Limited to simpler fixed-output LED drivers; lacks matrix/AFC capability and requires additional ICs for multi-channel coordination. | Choose LM3423QMHX/NOPB for cost-sensitive single-string applications without digital control needs; avoid for AFS/matrix systems requiring channel synchronization. |
Compared with TPS92518QPWPTQ1, the TPS92518HVQPWPTQ1 extends input range but sacrifices precision at lower voltages, while LM3423QMHX/NOPB reduces integration and eliminates digital configurability - making TPS92518QPWPTQ1 the optimal choice for scalable, SPI-managed dual-channel automotive LED platforms.
Availability
TPS92518QPWPTQ1 is available at Aetrix Electronics and suitable for automotive LED headlamps, adaptive front lighting systems (AFS), and matrix-based exterior lighting requiring stable component supply across extended temperature and long production lifecycles.
Supply support for TPS92518QPWPTQ1 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 broad manufacturing scale and automotive qualification expertise.
The TPS92518QPWPTQ1 belongs to TI's automotive LED controller product line, designed specifically for high-reliability, digitally configurable exterior lighting systems demanding AEC-Q100 compliance, thermal resilience, and SPI-based platform scalability.
FAQ
What is the maximum input voltage supported by the TPS92518QPWPTQ1?
The TPS92518QPWPTQ1 supports a maximum input voltage of 42 V, verified per its Absolute Maximum Ratings table (VIN to GND = –0.3 V to 44 V). This makes it suitable for direct connection to 12 V and 24 V automotive battery rails, including cold-crank and load-dump transients when properly clamped. The TPS92518HVQPWPTQ1 variant extends this to 65 V for 48 V systems.
How does the TPS92518QPWPTQ1 achieve 10,000:1 PWM dimming?
The TPS92518QPWPTQ1 achieves 10,000:1 PWM dimming through dedicated PWM1/PWM2 inputs with sub-100 ns propagation delay and internal high-frequency oscillator synchronization. Its quasi-hysteretic architecture maintains stable switching during deep dimming, and the absence of external compensation avoids phase-margin degradation - enabling clean, flicker-free dimming down to 0.01% duty cycle.
Can the TPS92518QPWPTQ1 operate without SPI configuration?
Yes - the TPS92518QPWPTQ1 can operate without SPI initialization by applying >23.6 V to the EN/UV pin, which bypasses SPI communication and loads factory-default register values (e.g., LEDx_PKTH_DAC = 127, LEDx_TOFF_DAC = 127). This enables immediate functional operation for prototyping or simplified designs, though full flexibility requires SPI access.
What thermal management features does the TPS92518QPWPTQ1 include?
The TPS92518QPWPTQ1 integrates junction temperature monitoring via on-die ADC (VTHERM register), thermal shutdown at 175°C with 10°C hysteresis, and boot UVLO with temperature-compensated thresholds. Its HTSSOP-24 package delivers RθJA = 32.5°C/W, and the exposed thermal pad must be soldered to a GND plane with ≥4 thermal vias for rated performance in +125°C ambient environments.
Is the TPS92518QPWPTQ1 pin-compatible with other devices in the same family?
Yes - the TPS92518QPWPTQ1 is pin-compatible with the TPS92518HVQPWPTQ1, sharing identical HTSSOP-24 (PWP) footprint, pin functions, and SPI register map. Differences are limited to internal UVLO thresholds and absolute maximum ratings; no PCB redesign is needed when upgrading from TPS92518QPWPTQ1 to TPS92518HVQPWPTQ1 for higher-voltage applications.
TPS92518QPWPTQ1 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
TPS92518QPWPTQ1 FAQ
1.How can I place an order for TPS92518QPWPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92518QPWPTQ1 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 TPS92518QPWPTQ1 reliable?
The price and inventory of TPS92518QPWPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92518QPWPTQ1 is usually 5 days.
3.What payment methods are accepted for TPS92518QPWPTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92518QPWPTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92518QPWPTQ1?
TPS92518QPWPTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92518QPWPTQ1 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 TPS92518QPWPTQ1?
For technical support, including TPS92518QPWPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92518QPWPTQ1 requirements.
6.How does Aetrix verify that TPS92518QPWPTQ1 is sourced from the original manufacturer or authorized distributors?
All TPS92518QPWPTQ1 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 TPS92518QPWPTQ1 meets industry standards.
7.What is the process for return or replacement of TPS92518QPWPTQ1?
All TPS92518QPWPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS92518QPWPTQ1, 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 TPS92518QPWPTQ1 part is unused and in its original packaging.
Return procedure for TPS92518QPWPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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