TPS92691 - Multi-Topology LED Driver | Texas Instruments
MPN: TPS92691 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.38 | $1.38 |
| 10 | $1.24 | $12.40 |
| 100 | $1.1 | $110.00 |
| 500 | $0.98 | $490.00 |
| 1,000 | $0.87 | $870.00 |
TPS92691 Overview
An LED driver is a power management IC that regulates the current flowing through one or more LEDs, ensuring consistent brightness and protecting the LEDs from current surges. The TPS92691 belongs to the family of switching LED drivers, which use inductive or capacitive energy storage to efficiently convert input voltage to the required LED current. This controller sits between the power source and the LED string, providing closed-loop regulation and dimming capabilities.
Key features of the TPS92691 include a wide input voltage range, programmable switching frequency up to 1 MHz, and a rail-to-rail current sense amplifier that allows low-side or high-side sensing. The device also features an internal 10-µA soft-start current source, an external soft-start capacitor for controlled startup, and a COMP pin that is clamped to the SS pin until LED current nears regulation. These features enable smooth startup and stable operation across varying load conditions.
The TPS92691 is available in a 16-pin HTSSOP (PWP) package, which provides a compact footprint with exposed thermal pad for improved heat dissipation. The device is designed for high-efficiency operation, with typical efficiencies above 90% in boost and buck configurations. It also includes protection features such as thermal shutdown and overcurrent protection, enhancing system reliability.
Typical applications include automotive LED headlights, daytime running lights, industrial LED lighting, and backlighting for displays. The device's flexibility in topology and dimming methods makes it a preferred choice for designers seeking a single controller for multiple LED driver designs.
When designing with the TPS92691, it is important to select appropriate external components such as the inductor, MOSFET, and sense resistor to meet the desired output current and efficiency. Proper PCB layout, including minimizing parasitic inductance and ensuring adequate thermal management, is critical for optimal performance.
Drop-in alternatives for TPS92691 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TPS92691 (same form factor and footprint) — differing in Switching Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS92691QPWPTQ1
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →TPS92690
⚡ Same Package📋 Reference alternative (not in catalog)
TPS92692
⚡ Same Package📋 Reference alternative (not in catalog)
TPS92692-Q1
⚡ Same Package📋 Reference alternative (not in catalog)
LT3756
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TPS92691 Maximum Ratings & Electrical Characteristics
| Topology | Boost, Buck, SEPIC, Flyback |
| Number of Outputs | 1 |
| Dimming | Analog, PWM |
| Switching Frequency | Programmable up to 1 MHz |
| Control Method | Fixed-frequency peak current mode |
| Current Sense Amplifier | Rail-to-rail |
| Soft-Start Current | 10 µA |
| Package | 16-HTSSOP (PWP) |
| Efficiency | >90% typical |
| Protection Features | Thermal shutdown, overcurrent protection |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
TPS92691 Pin Configuration
| Pin 1 | COMP — Compensation pin |
| Pin 2 | SS — Soft-start pin |
| Pin 3 | ISENSE — Current sense input |
| Pin 4 | GND — Ground |
| Pin 5 | DRV — Gate drive output |
| Pin 6 | VIN — Input supply |
| Pin 7 | VCC — Internal regulator output |
| Pin 8 | PWM — PWM dimming input |
| Pin 9 | ADIM — Analog dimming input |
| Pin 10 | REF — Reference output |
| Pin 11 | ISENSE+ — Positive current sense |
| Pin 12 | ISENSE- — Negative current sense |
| Pin 13 | NC — No connect |
| Pin 14 | NC — No connect |
| Pin 15 | NC — No connect |
| Pin 16 | NC — No connect |
Typical Applications
TPS92691 is suitable for 6 applications: Automotive LED Headlights, Industrial LED Lighting, Display Backlighting, General Lighting, Portable Lighting, Emergency Lighting.
Automotive LED Headlights
The TPS92691-Q1 is ideal for automotive LED headlights due to its AEC-Q100 qualification and support for boost and buck topologies. It provides accurate current regulation with a rail-to-rail sense amplifier, ensuring consistent brightness. The device's programmable switching frequency allows optimization for EMI, and its thermal shutdown protects against over-temperature. With over 90% efficiency, it minimizes power loss in the vehicle's electrical system.
Recommended
Industrial LED Lighting
In industrial lighting, the TPS92691 supports SEPIC and flyback topologies, making it suitable for wide input voltage ranges. Its analog and PWM dimming capabilities allow precise brightness control. The device's fixed-frequency peak current mode control ensures stable operation across load variations. With a programmable switching frequency up to 1 MHz, designers can optimize for efficiency or size. The rail-to-rail current sense amplifier enables accurate sensing in high-side or low-side configurations.
Recommended
Display Backlighting
For display backlighting, the TPS92691 provides efficient boost conversion for LED strings. Its PWM dimming allows high contrast ratios, essential for LCD panels. The device's soft-start feature prevents inrush current during startup, protecting LEDs. With a compact 16-HTSSOP package, it fits space-constrained designs. The programmable switching frequency helps avoid interference with display timing signals. According to TI, the TPS92691 achieves over 90% efficiency, reducing heat in backlight modules.
Recommended
General Lighting
The TPS92691 is suitable for general lighting applications such as LED bulbs and fixtures. Its multi-topology support allows design flexibility for various input voltages. The device's analog dimming enables smooth light output control. With a rail-to-rail current sense amplifier, it maintains accurate current regulation. The internal 10-µA soft-start current source ensures gentle startup, extending LED lifespan. The device's high efficiency reduces energy consumption, meeting energy-saving requirements.
Recommended
Portable Lighting
In portable lighting, the TPS92691's boost topology enables driving LEDs from a single-cell battery. Its low quiescent current extends battery life. The device's PWM dimming allows brightness control without color shift. The compact HTSSOP package is ideal for handheld devices. With programmable switching frequency, designers can optimize for efficiency or component size. The rail-to-rail current sense amplifier ensures accurate current sensing even at low battery voltages.
Recommended
Emergency Lighting
The TPS92691 is well-suited for emergency lighting systems that require reliable operation. Its support for flyback topology allows isolation from the mains. The device's thermal shutdown and overcurrent protection enhance safety. With a wide input voltage range, it can handle battery voltage variations. The programmable soft-start prevents LED damage during power-up. According to TI, the device's high efficiency ensures longer battery backup time.
Recommended
Recommended Products Summary
Engineering reference data for TPS92691 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS92691-Q1 | TPS92690 | TPS92692 |
|---|---|---|---|---|
| Package | 16-HTSSOP (PWP) | 16-HTSSOP (PWP) | 16-HTSSOP (PWP) | 16-HTSSOP (PWP) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Automotive Grade | No | Yes (AEC-Q100) | No | No |
| Pin Compatibility | Reference | Pin-compatible | Different pinout | Different pinout |
Key Differentiators
- Automotive-grade variant available (vs TPS92690)
- Rail-to-rail current sense amplifier (vs TPS92692)
- Multi-topology support (vs LT3756)
Design Notes
For optimal performance, place the input capacitor, output capacitor, and sense resistor close to the TPS92691 pins. Minimize the loop area of the gate drive path to reduce parasitic inductance and EMI. Use a solid ground plane under the device and connect the exposed thermal pad to the ground plane for heat dissipation. Refer to the TI datasheet for recommended layout guidelines.
The TPS92691 in a 16-HTSSOP package has an exposed thermal pad. Ensure adequate copper area on the PCB to dissipate heat, especially in high-current applications. The thermal resistance depends on the PCB layout; a larger copper area reduces junction temperature. For high ambient temperatures, consider adding thermal vias to improve heat transfer to other layers.
Do not exceed the absolute maximum ratings for VIN and other pins. Ensure the soft-start capacitor is properly sized to prevent inrush current. The COMP pin must be compensated correctly to avoid instability. Use a sense resistor with appropriate power rating to handle the LED current. Verify the switching frequency setting does not cause EMI issues in your application.
Compliance Information
RoHS compliant per TI product page. AEC-Q100 qualified for TPS92691-Q1 variant.
