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Texas Instruments TPS92640PWPT/NOPB
- Part No.:
- TPS92640PWPT/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS92640PWPT/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,250
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Product details
Overview
TPS92640PWPT/NOPB from Texas Instruments is a high-voltage synchronous buck LED controller for precision constant-current regulation in architectural and automotive LED 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 with valley current-mode control for stable CCM operation across wide VIN–VOUT ranges.
For engineers reviewing the TPS92640PWPT/NOPB datasheet, TPS92640PWPT/NOPB pinout, TPS92640PWPT/NOPB application, or TPS92640PWPT/NOPB equivalent, key selection criteria include its 3 V ±2% precision reference, programmable switching frequency (up to 1 MHz), 60 ns HG–LG deadtime, ±600 µV error amplifier offset, and HTSSOP-14 thermal performance (RθJA = 40.1°C/W).
Technical Context
The TPS92640PWPT/NOPB implements valley current-mode control using a controlled on-time architecture that adjusts tON based on VIN and scaled VOUT feedback, enabling near-constant switching frequency without slope compensation. Its chopper-stabilized error amplifier achieves ±600 µV input offset, ensuring true-zero analog dimming linearity down to 0 A LED current when paired with ROFF and COUT.
It integrates a 7.86–9.14 V startup regulator (VCC), 2.97–3.09 V reference (VREF), and dual-function UDIM pin supporting both UVLO (1.276 V threshold) and PWM dimming. Protection includes cycle-by-cycle CS overcurrent, VOUT overvoltage (2.85–3.25 V), and thermal shutdown at 165°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 7 V to 85 V - enables direct operation from 12 V, 24 V, 48 V, and 72 V industrial/automotive bus rails without pre-regulation. |
| LED Current Accuracy | ±600 µV EA offset - ensures <0.1% full-scale current error at low dimming levels and true-zero capability with external ROFF/COUT. |
| Dimming Range | 500:1 analog / 2500:1 PWM - supports high-fidelity brightness control in architectural lighting and adaptive automotive DRLs. |
| Switching Frequency | Programmable up to 1 MHz via RON - allows optimization of inductor size vs. EMI in space-constrained LED driver designs. |
| Gate Drive Strength | 2 Ω sourcing / 1–4.5 Ω sinking (HG/LG) - drives 150 mΩ MOSFETs at 500 kHz with minimal switching loss and robust EMI margin. |
| Thermal Resistance | RθJA = 40.1°C/W (HTSSOP-14) - supports 3.5 W dissipation at 85°C ambient with standard PCB copper area and 6–9 DAP vias. |
| Reference Voltage | 3.00 V ±2% (2.97–3.09 V) - provides stable setpoint for IADJ-based current programming and external microcontroller biasing. |
Pinout & Package
TPS92640PWPT/NOPB uses a 14-pin HTSSOP package (4.40 mm × 5.00 mm) with exposed thermal pad (DAP). The DAP must be connected to GND via 6–9 thermal vias for optimal junction-to-board conduction (RθJB = 20.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | High-voltage primary input (7–85 V); requires 1-µF ceramic bypass to GND for stability. |
| RON | Frequency programming | Connect resistor to VIN to set tON ramp rate; determines switching frequency with CON capacitor. |
| UDIM | PWM dimming / UVLO input | Dual-function pin: 1.276 V UVLO threshold + PWM command input; 21 µA hysteresis current source. |
| VOUT | Voltage feedback input | Scaled-down output voltage sensing node; sets VOUT overvoltage protection threshold (2.85–3.25 V). |
| VREF | Precision reference output | 3.00 V ±2% buffered reference; supplies bias to external circuits and sets IADJ scaling (VCS = VIADJ/10). |
| IADJ | Analog dimming control | Adjusts LED current setpoint; 0–2.54 V range enables linear dimming and thermal foldback via NTC divider. |
| COMP | Loop compensation | Connect ceramic capacitor to GND to stabilize valley current control loop; no external op-amp needed. |
| HG | High-side gate driver output | Drives external NFET gate; 2 Ω sourcing / 1.1–4.5 Ω sinking; requires series resistor for EMI control. |
| SW | Switch node connection | Connects to buck inductor and high-side FET drain; critical for BOOT capacitor charge path and layout. |
| BOOT | Bootstrap supply | Provides boosted voltage for HG drive; requires 100-nF ceramic cap between BOOT and SW nodes. |
| VCC | Bias supply output | 8.5 V regulated output (7.86–9.14 V); bypass with 2.2-µF ceramic cap to support internal logic and drivers. |
| LG | Low-side gate driver output | Drives external NFET gate; 1.5–6 Ω sourcing / 1–4.5 Ω sinking; matched deadtime (60 ns) with HG. |
| CS | Current sense input | Connects to bottom of LED sense resistor; regulates VCS to VIADJ/10 with auto-zeroed error amplifier. |
| GND | System ground | Power and signal return; must be tied to DAP for thermal and noise integrity. |
| SDRV | Shunt FET driver | Not present on TPS92640 - reserved; only implemented on TPS92641 (16-pin variant). |
Key Features
| Feature | Design Value |
|---|---|
| Valley current-mode control | Eliminates need for slope compensation and enables stable CCM operation across 10:1 VIN/VOUT ratios. |
| Chopper-stabilized error amplifier | ±600 µV input offset enables true-zero analog dimming and sub-0.1% current regulation accuracy. |
| Integrated 8.5 V startup regulator | Self-biases from 7–85 V input; delivers 63 mA max to power internal logic and gate drivers without aux supply. |
| Programmable UVLO with hysteresis | 1.276 V threshold + 21 µA current source enables precise, resistor-programmable turn-on/turn-off voltages. |
| 60 ns matched HG–LG deadtime | Prevents shoot-through in synchronous buck stage; maintains >90% efficiency at 500 kHz with 150 mΩ FETs. |
| Thermal shutdown with hysteresis | 165°C trip point + 20°C hysteresis prevents latch-up during transient overload or poor heatsinking. |
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 vehicles. IC Role / Device Role / Timing Role: Synchronous buck controller regulating 3–5 A LED current with 2500:1 PWM dimming resolution and fast UDIM response (<280 ns). Use Value: Enables compliance with ECE R149 photometric standards via precise current stability (±0.5%) and flicker-free dimming. |
Use Scenario: Multi-channel tunable white luminaires mixing warm/cool LEDs for CCT adjustment in commercial interiors. IC Role / Device Role / Timing Role: Constant-current regulator with independent IADJ inputs per channel, supporting analog dimming across 500:1 range with true-zero capability. Use Value: Delivers smooth color transition without step artifacts by maintaining CCM and linear ILED vs. VIADJ down to 0 A. |
| Industrial High-Bay LED Fixture | Truck & Bus Exterior Lighting |
|
Use Scenario: 100–200 W high-bay fixtures operating from 48 V DC distribution in warehouses and factories. IC Role / Device Role / Timing Role: Primary buck controller driving 4–5 A LED strings with 7–85 V input tolerance and integrated OVP/UVLO. Use Value: Reduces BOM count by eliminating external bias supply and simplifies layout with single COMP capacitor compensation. |
Use Scenario: Stop/tail/turn signal modules requiring robust operation across -40°C to +105°C ambient and 12–32 V battery transients. IC Role / Device Role / Timing Role: LED current controller with 165°C thermal shutdown, ±2000 V HBM ESD rating, and 40.1°C/W thermal resistance. Use Value: Ensures long-term reliability in harsh environments without derating, validated per AEC-Q100 Class 2 temperature requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS92641PWPR | 16-pin HTSSOP with integrated shunt FET driver (SDRV) and SDIM input; adds 20000:1 shunt PWM dimming. | Required for ultra-high-resolution dimming where main FET PWM is insufficient; not pin-compatible with TPS92640. | Select TPS92641 if shunt dimming is needed; otherwise TPS92640 reduces cost and layout complexity. |
| LTC3783EFE#PBF | 40 V max VIN, no integrated VCC regulator, requires external bias; higher quiescent current (3 mA vs. 3 mA typical). | Best suited for lower-input-voltage LED systems (<40 V); lacks UDIM dual-function and true-zero analog dimming. | Choose LTC3783 only when operating below 40 V and needing adjustable current limit threshold instead of fixed VCS reference. |
Compared with TPS92641PWPR, TPS92640PWPT/NOPB offers identical core buck control but omits shunt dimming circuitry-reducing cost and footprint while retaining full 2500:1 PWM and 500:1 analog dimming. Versus LTC3783EFE#PBF, it delivers wider VIN range, integrated bias, lower offset, and true-zero capability-making it superior for automotive and high-VIN architectural lighting.
Availability
TPS92640PWPT/NOPB is available at Aetrix Electronics and suitable for automotive headlamp drivers, architectural tunable-white luminaires, and industrial high-bay LED fixtures requiring stable component supply, extended temperature operation, and long-lifecycle support.
Supply support for TPS92640PWPT/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, industrial, and lighting control solutions.
The TPS92640PWPT/NOPB belongs to TI's precision LED controller product line, designed specifically for high-reliability, wide-input-voltage constant-current LED drivers demanding true-zero analog dimming, high dimming ratio, and robust thermal/overvoltage protection.
FAQ
What is the maximum input voltage supported by the TPS92640PWPT/NOPB?
The TPS92640PWPT/NOPB supports an absolute maximum input voltage of 90 V and a recommended operating range of 7 V to 85 V. This wide VIN range allows direct connection to 12 V, 24 V, 48 V, and 72 V industrial and automotive power buses without intermediate regulation, making the TPS92640PWPT/NOPB ideal for high-voltage LED driver applications where input rail variability is common.
Does the TPS92640PWPT/NOPB support true-zero analog dimming?
Yes, the TPS92640PWPT/NOPB supports true-zero analog dimming through its chopper-stabilized error amplifier (±600 µV offset) and valley current-mode control that maintains continuous conduction mode (CCM). When IADJ is driven to 0 V and configured with external ROFF and COUT, the TPS92640PWPT/NOPB achieves linear LED current regulation down to 0 A average, enabling flicker-free dimming in architectural and display lighting.
What is the purpose of the UDIM pin on the TPS92640PWPT/NOPB?
The UDIM pin on the TPS92640PWPT/NOPB serves a dual function: it acts as both a PWM dimming input and an undervoltage lockout (UVLO) enable pin. With a precise 1.276 V threshold and 21 µA hysteresis current source, UDIM allows resistor-programmable UVLO while simultaneously accepting PWM signals to modulate LED brightness-enabling simplified system-level dimming control without additional logic.
How is switching frequency programmed on the TPS92640PWPT/NOPB?
Switching frequency on the TPS92640PWPT/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-scaled by VOUT feedback-determines tON. This controlled-on-time architecture yields a nearly constant fSW up to 1 MHz, simplifying EMI filtering and inductor selection.
What thermal management features does the TPS92640PWPT/NOPB include?
The TPS92640PWPT/NOPB includes thermal shutdown at 165°C with 20°C hysteresis, junction-to-ambient thermal resistance of 40.1°C/W (HTSSOP-14), and an exposed thermal pad (DAP) requiring 6–9 vias to GND. These features ensure reliable operation in sealed enclosures and high-ambient environments, and the DAP connection directly lowers RθJB to 20.9°C/W for improved power handling.
TPS92640PWPT/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
TPS92640PWPT/NOPB FAQ
1.How can I place an order for TPS92640PWPT/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS92640PWPT/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 TPS92640PWPT/NOPB reliable?
The price and inventory of TPS92640PWPT/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS92640PWPT/NOPB is usually 5 days.
3.What payment methods are accepted for TPS92640PWPT/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS92640PWPT/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS92640PWPT/NOPB?
TPS92640PWPT/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS92640PWPT/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 TPS92640PWPT/NOPB?
For technical support, including TPS92640PWPT/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS92640PWPT/NOPB requirements.
6.How does Aetrix verify that TPS92640PWPT/NOPB is sourced from the original manufacturer or authorized distributors?
All TPS92640PWPT/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 TPS92640PWPT/NOPB meets industry standards.
7.What is the process for return or replacement of TPS92640PWPT/NOPB?
All TPS92640PWPT/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with TPS92640PWPT/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 TPS92640PWPT/NOPB part is unused and in its original packaging.
Return procedure for TPS92640PWPT/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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