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Texas Instruments TPS92640PWPR/NOPB
- Part No.:
- TPS92640PWPR/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS92640PWPR/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:11,606
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Product details
Overview
TPS92640PWPR/NOPB from Texas Instruments is a high-voltage synchronous buck LED controller for precision constant-current regulation in automotive and architectural lighting. It operates from 7 V to 85 V input, delivers up to 5 A output current, supports 500:1 analog dimming and 2500:1 standard PWM dimming, and integrates 2-Ω, 1-A peak gate drivers for external high- and low-side NFETs in LED driver topologies.
For engineers reviewing the TPS92640PWPR/NOPB datasheet, TPS92640PWPR/NOPB pinout, TPS92640PWPR/NOPB application, or TPS92640PWPR/NOPB equivalent, this page provides verified technical context, validated pin functions, confirmed dimming performance metrics, package-specific thermal data, and two rigorously cross-checked alternative controllers for LED current regulation designs requiring wide VIN range and true-zero analog dimming capability.
Technical Context
The TPS92640PWPR/NOPB implements valley current-mode control with a 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 features auto-zero calibration, achieving ±600 µV input offset voltage and enabling true-zero LED current regulation via IADJ-adjusted CS reference.
It integrates a high-voltage start-up regulator (VCC = 7.86–9.14 V at 10 mA), precision 3.03 V ±2% reference (2.97–3.09 V), and programmable overvoltage protection (2.85–3.25 V at VOUT). Deadtime between HG and LG outputs is fixed at 60 ns, and minimum on-/off-times are 235 ns and 230 ns respectively - critical for stable operation at high duty cycles and high-frequency switching up to 1 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 7 V to 85 V - enables direct connection to 12 V/24 V/48 V automotive and industrial bus rails without pre-regulation. |
| LED Current Sense Threshold | VCSREF = VIADJ/10 - allows precise, adjustable current regulation down to zero via external IADJ voltage (0–2.54 V). |
| Dimming Range | 500:1 analog / 2500:1 PWM - supports high-fidelity brightness control in architectural and adaptive lighting systems. |
| Reference Voltage | 3.03 V ±2% - supplies stable bias for external circuitry and enables accurate feedback scaling for VOUT OVP. |
| Gate Drive Strength | 2 Ω sourcing/sinking, 1 A peak - drives high-side and low-side NFETs with fast edge rates while limiting EMI via optional series resistors. |
| Thermal Resistance | RθJA = 40.1 °C/W (HTSSOP-14) - defines maximum power dissipation limit under standard PCB layout with DAP thermal vias. |
| UVLO Threshold | UDIM start threshold = 1.276 V ±66 mV - enables programmable input undervoltage lockout using resistor divider from VIN. |
Pinout & Package
TPS92640PWPR/NOPB is housed in a 14-pin HTSSOP (PWP) package measuring 4.40 mm × 5.00 mm, with exposed thermal pad (DAP) requiring 6–9 vias to GND plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply input | Accepts 7–85 V DC; requires 1-µF ceramic bypass capacitor to GND for stability. |
| RON | Switching frequency programming | Connects to VIN and GND via resistor to set on-time; determines fSW in conjunction with CON capacitor. |
| UDIM | UVLO/PWM dimming input | Dual-function pin: 1.276-V UVLO threshold with 21-µA hysteresis current source; accepts PWM signal for LED brightness control. |
| VOUT | OVP feedback input | Monitors scaled-down output voltage; triggers 2.85–3.25 V overvoltage protection when threshold exceeded. |
| VREF | Precision reference output | 3.03 V ±2% reference; bypass with 100-nF ceramic capacitor to support external bias and feedback networks. |
| IADJ | Analog dimming control | Sets CS reference voltage (VCSREF = VIADJ/10); enables linear analog dimming and thermal foldback via NTC network. |
| COMP | Error amplifier compensation | Connects to GND via ceramic capacitor to stabilize current loop; sets pole/zero locations for valley-current control. |
| HG | High-side gate driver output | Drives external high-side NFET gate; series resistor required to control slew rate and reduce EMI. |
| SW | Switch node connection | Connects to buck inductor and external high/low-side FET sources; critical for BOOT capacitor coupling. |
| BOOT | Bootstrap supply | Provides boosted voltage for HG drive; requires 100-nF ceramic capacitor between BOOT and SW. |
| VCC | Bias supply output | 8.5 V regulated output (7.86–9.14 V); bypass with 2.2-µF ceramic capacitor to power internal circuitry. |
| LG | Low-side gate driver output | Drives external low-side NFET gate; series resistor required to mitigate shoot-through and EMI. |
| CS | Current sense input | Measures voltage across external sense resistor; regulates LED current by comparing to VIADJ/10. |
| GND | System ground | Common return path; must be connected to DAP thermal pad for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Valley current-mode control | Eliminates slope compensation requirement and prevents subharmonic oscillation above 50% duty cycle. |
| Auto-zero error amplifier | ±600 µV input offset enables true-zero LED current regulation and high linearity across full dimming range. |
| Programmable switching frequency | Set via RON resistor and CON capacitor; supports 100 kHz–1 MHz range without external oscillator. |
| Integrated start-up regulator | Self-biases from VIN (7–85 V); delivers 8.5 V @ 63 mA max to power internal logic and gate drivers. |
| Thermal shutdown protection | Triggers at 165 °C junction temperature with 20 °C hysteresis to prevent permanent device damage. |
| Undervoltage lockout with hysteresis | UDIM pin provides 1.276-V threshold and programmable hysteresis via external resistor divider. |
Applications
| Automotive Headlamp Driver | Architectural Tunable White Lighting |
|---|---|
|
Use Scenario: High-brightness LED headlamps requiring adaptive beam shaping and dynamic dimming in 12 V/24 V vehicle systems. IC Role / Device Role / Timing Role: Synchronous buck controller regulating constant current to multi-string LED arrays; manages UDIM-based PWM dimming and thermal foldback during extended operation. Use Value: Enables 2500:1 PWM dimming resolution and true-zero analog dimming for smooth transition between DRL, low-beam, and high-beam modes without flicker or color shift. |
Use Scenario: Commercial tunable-white luminaires adjusting correlated color temperature (CCT) and intensity across 2700 K–6500 K range using dual-channel LED strings. IC Role / Device Role / Timing Role: Dual-string current controller with independent IADJ inputs per channel; maintains precise current matching and synchronized dimming response. Use Value: Achieves 500:1 analog dimming linearity and <600 µV error amplifier offset to preserve CCT accuracy at low light levels. |
| Industrial Machine Vision Illumination | Truck & Bus Exterior Lighting |
|
Use Scenario: High-intensity strobed LED arrays used in automated optical inspection systems requiring microsecond-level timing precision and repeatable light output. IC Role / Device Role / Timing Role: Fast-response current controller with 235 ns minimum on-time and 60 ns deadtime; synchronizes LED current pulses with camera trigger signals via UDIM. Use Value: Delivers stable, jitter-free current pulses at up to 1 MHz switching frequency - essential for eliminating motion blur in high-speed imaging. |
Use Scenario: Rear combination lamps (brake, turn, tail) operating directly from 24 V truck/bus battery with wide temperature and load variation. IC Role / Device Role / Timing Role: Robust buck controller with 7–85 V input range, integrated OVP, thermal shutdown, and UVLO hysteresis for reliable cold-cranking and load-dump immunity. Use Value: Maintains LED current regulation across -40 °C to +125 °C ambient and withstands 100 V transients per ISO 7637-2 due to high-voltage rated pins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3410XMY/NOPB | Limited to 42 V VIN max; no integrated VCC regulator; lacks true-zero analog dimming and auto-zero amplifier. | Suitable for lower-voltage portable LED applications but not automotive 24 V/48 V or high-reliability industrial use. | Select TPS92640PWPR/NOPB when >42 V input, precision zero-current dimming, or integrated bias supply is required. |
| TPS92641PWPR | 16-pin HTSSOP; adds SDIM/SDRV pins for shunt-FET PWM dimming; identical core control architecture and pin compatibility for shared functions. | Required only when shunt-FET dimming (20,000:1 range) is needed; otherwise functionally redundant for standard buck topologies. | Choose TPS92640PWPR/NOPB for cost-optimized, compact 14-pin implementation where shunt dimming is unnecessary. |
Compared with LM3410XMY/NOPB, TPS92640PWPR/NOPB extends input range by 43 V, adds true-zero dimming and integrated bias, while TPS92641PWPR offers identical regulation performance plus shunt-FET dimming capability at higher pin count and BOM cost.
Availability
TPS92640PWPR/NOPB is available at Aetrix Electronics and suitable for automotive headlamp drivers, architectural tunable-white luminaires, industrial machine vision illuminators, and heavy-duty vehicle exterior lighting requiring stable component supply across extended temperature and voltage ranges.
Supply support for TPS92640PWPR/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 expertise in automotive-grade and industrial-grade power conversion solutions.
The TPS92640 belongs to TI's high-voltage LED controller product line, engineered specifically for precision constant-current regulation in demanding lighting applications where wide input range, true-zero dimming, and robust thermal/overvoltage protection are mandatory.
FAQ
What is the maximum input voltage supported by the TPS92640PWPR/NOPB?
The TPS92640PWPR/NOPB supports an absolute maximum input voltage of 90 V on the VIN pin, with recommended continuous operation from 7 V to 85 V. This wide range enables direct integration into 12 V, 24 V, and 48 V automotive and industrial power systems without pre-regulation stages. The device's internal start-up regulator and gate driver UVLO thresholds are designed to remain functional across this full span.
Does the TPS92640PWPR/NOPB support true-zero analog dimming?
Yes, the TPS92640PWPR/NOPB supports true-zero analog dimming via its auto-zero error amplifier and IADJ-adjusted current sense reference (VCSREF = VIADJ/10). With VIADJ driven to 0 V, the controller regulates average LED current to 0 A while maintaining continuous conduction mode - provided an external ROFF resistor is added from VOUT to CS to manage ripple and ensure stable startup behavior.
How is switching frequency programmed on the TPS92640PWPR/NOPB?
Switching frequency on the TPS92640PWPR/NOPB is programmed using an external resistor (RON) between the RON and VIN pins, combined with a capacitor (CON) from RON to GND. The RON resistor sets the charging current into CON, and the resulting ramp rate - referenced to scaled VOUT feedback - determines on-time. Typical range spans 100 kHz to 1 MHz depending on RON and CON values.
What thermal management is required for the TPS92640PWPR/NOPB in continuous operation?
The TPS92640PWPR/NOPB uses a 14-pin HTSSOP package with exposed thermal pad (DAP). For continuous operation at full load, at least six 0.3-mm vias must connect the DAP to an internal or bottom-layer GND plane. Measured RθJA is 40.1 °C/W; derating is required above 85 °C ambient. Thermal shutdown activates at 165 °C junction temperature with 20 °C hysteresis.
Can the TPS92640PWPR/NOPB be used with both high-side and low-side NMOS configurations?
Yes, the TPS92640PWPR/NOPB is designed explicitly for synchronous buck topologies using external high-side and low-side NMOS FETs. Its dedicated HG and LG outputs drive both gates with matched 60 ns deadtime, 2-Ω drive strength, and independent slew-rate control via series resistors. The CS pin senses current on the low-side (source-to-GND) configuration, which is the standard and recommended placement.
TPS92640PWPR/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-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:
- 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:
- 14-HTSSOP
TPS92640PWPR/NOPB FAQ
1.How can I place an order for TPS92640PWPR/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92640PWPR/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 TPS92640PWPR/NOPB reliable?
The price and inventory of TPS92640PWPR/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92640PWPR/NOPB is usually 5 days.
3.What payment methods are accepted for TPS92640PWPR/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92640PWPR/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92640PWPR/NOPB?
TPS92640PWPR/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92640PWPR/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 TPS92640PWPR/NOPB?
For technical support, including TPS92640PWPR/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92640PWPR/NOPB requirements.
6.How does Aetrix verify that TPS92640PWPR/NOPB is sourced from the original manufacturer or authorized distributors?
All TPS92640PWPR/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 TPS92640PWPR/NOPB meets industry standards.
7.What is the process for return or replacement of TPS92640PWPR/NOPB?
All TPS92640PWPR/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with TPS92640PWPR/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 TPS92640PWPR/NOPB part is unused and in its original packaging.
Return procedure for TPS92640PWPR/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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