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Texas Instruments TPS92641PWP/NOPB
- Part No.:
- TPS92641PWP/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS92641PWP/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:634
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Product details
Overview
TPS92641PWP/NOPB from Texas Instruments is a high-voltage synchronous buck LED controller with shunt FET PWM dimming capability, 7–85 V input range, 3 V ±2% precision reference, 2-Ω/1-A gate drivers, and valley current-mode control for stable constant-current LED regulation up to 5 A in automotive and architectural lighting systems.
For engineers reviewing the TPS92641PWP/NOPB datasheet, TPS92641PWP/NOPB pinout, TPS92641PWP/NOPB application, or TPS92641PWP/NOPB equivalent, this device supports true-zero analog dimming (500:1), shunt-FET PWM dimming (20,000:1), programmable switching frequency up to 1 MHz, and integrated thermal shutdown - critical for high-reliability LED driver design.
Technical Context
The TPS92641PWP/NOPB implements valley current-mode control with controlled on-time architecture, eliminating need for slope compensation while maintaining near-constant switching frequency across input (7–85 V) and output voltage ranges. Its error amplifier uses auto-zero chopping to achieve ±600 µV input offset, enabling precise LED current regulation.
It integrates dual gate drivers (HG/LG) with 60 ns deadtime control, BOOT UVLO (1.9–4.5 V), and dedicated SDRV output with 5.6–30 Ω sourcing resistance for external shunt FET control - a feature exclusive to TPS92641 within the family. The UDIM pin serves dual role: PWM dimming input and programmable UVLO with 1.276 V threshold and 21 µA hysteresis current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 7 V to 85 V - enables direct operation from 12 V, 24 V, and 48 V industrial/automotive rails without pre-regulation. |
| VREF Accuracy | 3.00 V ±2% - provides stable reference for IADJ-based current sense threshold scaling with <±10 mV native offset impact. |
| Dimming Range | 20,000:1 shunt-FET PWM - achieved via dedicated SDRV output and SDIM input with 68–100 ns propagation delay. |
| Gate Drive Strength | 2 Ω sourcing / 1.1–4.5 Ω sinking - supports fast, low-loss switching of external high-side and low-side NFETs up to 5 A load. |
| Thermal Shutdown | 165 °C threshold with 20 °C hysteresis - protects against sustained overtemperature in enclosed LED modules. |
| Switching Frequency | Programmable up to 1 MHz via RON resistor - allows optimization of inductor size, efficiency, and EMI performance. |
| CS Reference Voltage | VCSREF = VIADJ/10 - enables adjustable current sense threshold from 0 V to 254 mV, supporting wide LED current ranges. |
Pinout & Package
TPS92641PWP/NOPB is housed in a 16-pin HTSSOP package (4.40 mm × 5.00 mm) with exposed thermal pad (DAP) requiring 6–9 vias to GND plane for effective heat dissipation. Pin count and layout differ from TPS92640 (14-pin HTSSOP); SDIM and SDRV pins are unique to this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDIM | PWM dimming input | Accepts logic-level PWM signal (1.29–1.74 V rising threshold); triggers shunt-FET dimming path when asserted. |
| SDRV | Shunt FET gate driver output | Drives external parallel NFET across LED string; 5.6–30 Ω sourcing resistance enables clean turn-on of shunt switch. |
| CS | Current sense input | Measures voltage across series sense resistor; regulated to VIADJ/10 for precise LED current control. |
| IADJ | Analog dimming reference input | Sets LED current target via resistor divider from VREF; supports thermal foldback when connected to NTC network. |
| HG / LG | High-side / low-side gate drivers | Drive external buck NFETs with 60 ns deadtime; HG sinking resistance 1.1–4.5 Ω minimizes shoot-through risk. |
| BOOT | High-side gate boost supply | Requires ceramic capacitor between BOOT and SW; UVLO (1.9–4.5 V) prevents weak high-side drive during startup. |
| DAP | Thermal pad | Internally connected to GND; must be soldered with ≥6 vias to internal GND plane for RθJB = 16.5 °C/W thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Shunt-FET PWM dimming | 20,000:1 ratio enabled by dedicated SDIM input and SDRV output - eliminates LED current ripple at ultra-low brightness. |
| True-zero analog dimming | Linear 500:1 dimming down to 0 A average LED current using auto-zero error amplifier and ROFF compensation network. |
| Valley current control | Eliminates need for slope compensation and maintains stability >50% duty cycle - simplifies loop compensation with single CCOMP. |
| Integrated start-up regulator | VCC regulated to 8.5 V ±7.5% with 63 mA current limit - powers controller directly from VIN without auxiliary supply. |
| Programmable UVLO hysteresis | UDIM pin provides 1.276 V threshold + 21 µA hysteresis current - allows robust input undervoltage protection with external R-divider. |
Applications
| Automotive Headlamp Driver | Architectural Tunable White Lighting |
|---|---|
|
Use Scenario: High-brightness LED headlamps requiring flicker-free, high-contrast dimming under 12 V/24 V battery supply with thermal derating. IC Role / Device Role / Timing Role: Synchronous buck controller regulating constant current to multi-string LEDs; SDRV drives shunt FET for pixel-level intensity control. Use Value: 20,000:1 shunt PWM dimming ensures compliance with ECE R149 photometric requirements without visible stepping or color shift. |
Use Scenario: RGBW tunable white luminaires in commercial buildings needing smooth CCT and lumen adjustment across temperature and line voltage variations. IC Role / Device Role / Timing Role: Precision current regulator with IADJ-based analog dimming; VREF supplies stable bias to microcontroller ADC reference. Use Value: ±600 µV error amp offset and 3 V ±2% VREF enable <±1% LED current accuracy over –40°C to 125°C junction range. |
| Industrial Machine Vision Illumination | Truck & Bus Exterior Lighting |
|
Use Scenario: Strobe-capable LED arrays for high-speed inspection systems requiring microsecond-level PWM timing repeatability and zero-current hold. IC Role / Device Role / Timing Role: Valley current-mode controller with controlled on-time architecture; UDIM accepts externally generated strobe signals with <100 ns propagation delay. Use Value: True-zero operation via ROFF network enables complete LED current cutoff between strobes - eliminating residual glow that corrupts image capture. |
Use Scenario: Sealed LED marker lamps and stop/tail lights operating across 9–36 V input with vibration, moisture, and thermal cycling exposure. IC Role / Device Role / Timing Role: Robust buck controller with 85 V absolute max VIN rating, thermal shutdown (165 °C), and 40 V reverse battery tolerance via external protection. Use Value: RθJB = 16.5 °C/W and DAP thermal pad ensure reliable operation at 85°C ambient without derating in confined enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS92640PWP/NOPB | 14-pin HTSSOP; lacks SDIM and SDRV pins - no shunt-FET dimming capability. | Supports only standard PWM (2500:1) and analog dimming (500:1); unsuitable for ultra-high-resolution dimming. | Select when shunt dimming is unnecessary and board space is constrained; shares same VREF, gate drive, and control architecture. |
| LM3410XMYX/NOPB | Fixed-frequency current-mode controller; no VREF output, no UDIM dual-function pin, max VIN = 42 V. | Limited to lower-input-voltage LED strings; lacks thermal shutdown and programmable UVLO hysteresis. | Choose for cost-sensitive, non-automotive designs with ≤42 V input and no requirement for true-zero or shunt dimming. |
Compared with TPS92641PWP/NOPB, TPS92640PWP/NOPB omits shunt-dimming functionality but retains identical analog dimming, gate drive, and thermal protection - making it a functional subset. LM3410XMYX/NOPB offers simpler fixed-frequency operation but sacrifices input voltage range, precision reference, and advanced dimming features required for automotive-grade systems.
Availability
TPS92641PWP/NOPB is available at Aetrix Electronics and suitable for automotive headlamps, architectural tunable-white systems, industrial machine vision illuminators, and heavy-duty vehicle exterior lighting requiring stable component supply across extended temperature and voltage ranges.
Supply support for TPS92641PWP/NOPB 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 power management ICs, with decades of automotive-qualified product development and AEC-Q100 validation expertise.
The TPS9264x product line was designed specifically for high-reliability, wide-input-voltage LED current regulation in automotive and industrial lighting - emphasizing precision dimming, thermal resilience, and system-level fault protection.
FAQ
What is the maximum input voltage supported by the TPS92641PWP/NOPB?
The TPS92641PWP/NOPB supports an absolute maximum input voltage of 90 V and operates continuously across 7 V to 85 V. This wide range allows direct connection to 12 V, 24 V, and 48 V industrial and automotive power buses without pre-regulation, and accommodates load-dump transients common in vehicle electrical systems.
Does the TPS92641PWP/NOPB include an integrated voltage reference, and what is its accuracy?
Yes, the TPS92641PWP/NOPB includes an integrated precision voltage reference (VREF) with nominal value 3.00 V and ±2% accuracy over temperature and input voltage. It can source up to 2.1 mA and is used to set the LED current sense threshold via the IADJ pin, enabling accurate and stable current regulation.
How does the TPS92641PWP/NOPB achieve 20,000:1 PWM dimming?
The TPS92641PWP/NOPB achieves 20,000:1 PWM dimming through its dedicated SDIM input and SDRV output, which drive an external shunt FET across the LED string. This bypasses the main buck converter during off-cycles, eliminating inductor current ripple and enabling ultra-low duty-cycle control without LED current droop or color shift.
What thermal management features does the TPS92641PWP/NOPB provide?
The TPS92641PWP/NOPB includes thermal shutdown at 165 °C with 20 °C hysteresis and a thermally enhanced HTSSOP package with exposed DAP pad. With 6–9 vias to GND, it achieves RθJB = 16.5 °C/W - enabling reliable operation at 125 °C junction temperature in sealed LED modules without forced airflow.
Can the TPS92641PWP/NOPB operate in true-zero analog dimming mode, and what is required?
Yes, the TPS92641PWP/NOPB supports true-zero analog dimming down to 0 A average LED current using its auto-zero error amplifier. An external ROFF resistor from VOUT to CS is required to shunt positive current ripple and maintain amplifier stability; sizing must satisfy V′CS > ±10 mV to ensure monotonic startup behavior.
TPS92641PWP/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 7V
- Voltage - Supply (Max):
- 85V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
TPS92641PWP/NOPB FAQ
1.How can I place an order for TPS92641PWP/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92641PWP/NOPB 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 TPS92641PWP/NOPB reliable?
The price and inventory of TPS92641PWP/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92641PWP/NOPB is usually 5 days.
3.What payment methods are accepted for TPS92641PWP/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92641PWP/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92641PWP/NOPB?
TPS92641PWP/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92641PWP/NOPB 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 TPS92641PWP/NOPB?
For technical support, including TPS92641PWP/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92641PWP/NOPB requirements.
6.How does Aetrix verify that TPS92641PWP/NOPB is sourced from the original manufacturer or authorized distributors?
All TPS92641PWP/NOPB 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 TPS92641PWP/NOPB meets industry standards.
7.What is the process for return or replacement of TPS92641PWP/NOPB?
All TPS92641PWP/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with TPS92641PWP/NOPB, 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 TPS92641PWP/NOPB part is unused and in its original packaging.
Return procedure for TPS92641PWP/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS92641PWP/NOPB Tags
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BCR402RE6327HTSA1
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