Overview
The TPS61166DSKR from Texas Instruments is a highly integrated boost converter designed for driving white LEDs in various applications. This device features a 20-V rated internal switch FET and an integrated power diode, making it suitable for driving up to 5 LEDs in series. The TPS61166 is particularly useful in mobile devices, digital cameras, and other portable electronics due to its small form factor and low power consumption.
The device operates with an IC supply range of 2.5-V to 6-V and a power stage input range of 4.5-V to 10-V, making it compatible with single- or two-cell Li-ion battery applications. It includes multiple protection features such as over-current protection (OCP), over-voltage protection (OVP), over-load protection (OLP), and thermal shutdown, ensuring reliable operation under various conditions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| IC Supply Range (VIN) | 2.5 | 6 | V | |
| Power Stage Input Range (VBAT) | 4.5 | 10 | V | |
| Output Voltage at VO Pin | 17 | V | ||
| Switching Frequency | 1.0 | 1.2 | 1.4 | MHz |
| Maximum Duty Cycle | 90 | 93 | % | |
| N-Channel MOSFET Current Limit | 0.9 | 1.1 | 1.5 | A |
| Over Voltage Protection Threshold | 18 | 19 | V | |
| Thermal Shutdown Threshold | 150 | °C | ||
| Operating Junction Temperature | –40 | 125 | °C | |
| Operating Free-Air Temperature | –40 | 85 | °C |
Key Features
- Integrated 1.1-A / 20-V Internal Switch FET and Power Diode: Reduces component count and improves efficiency.
- Peak Current-Mode Control with Constant PWM Frequency: Ensures stable operation and reduces sub-harmonic oscillation.
- Fast Burst Mode Dimming: Supports high-frequency PWM dimming with minimal audible noise.
- Multiple Protection Features: Includes OCP, OVP, OLP, and thermal shutdown for reliable operation.
- Small Form Factor: Available in a 2.5 mm × 2.5 mm SON package with thermal pad.
- Low Quiescent Current: Consumes only 0.9 mA to 1.5 mA during no-load conditions.
- External LED Current Programming: Allows for adjustable LED brightness using an external current sense resistor.
Applications
- Mobile Phones: Suitable for backlighting in mobile devices.
- Digital Cameras: Ideal for camera flash and display backlighting.
- Personal Camcorders: Used for LCD backlighting and other LED lighting needs.
- Single Lens Reflex (SLR) Cameras: Supports the high power requirements of SLR camera systems.
- Other Portable Electronics: Applicable in various portable devices requiring efficient LED lighting.
Q & A
- What is the IC supply range of the TPS61166?
The IC supply range is from 2.5 V to 6 V.
- What is the power stage input range of the TPS61166?
The power stage input range is from 4.5 V to 10 V.
- How many LEDs can the TPS61166 drive in series?
The TPS61166 can drive up to 5 LEDs in series.
- What is the maximum duty cycle of the TPS61166?
The maximum duty cycle is 93%.
- What protection features does the TPS61166 include?
The device includes over-current protection (OCP), over-voltage protection (OVP), over-load protection (OLP), and thermal shutdown.
- What is the typical switching frequency of the TPS61166?
The typical switching frequency is 1.2 MHz.
- How does the TPS61166 support dimming?
The device supports fast burst mode dimming with minimal audible noise through high-frequency PWM signals.
- What is the package type and size of the TPS61166?
The device is available in a 2.5 mm × 2.5 mm SON package with a thermal pad.
- How is the LED current programmed in the TPS61166?
The LED current is programmed externally using a current sense resistor in series with the LED string.
- What is the thermal shutdown threshold of the TPS61166?
The thermal shutdown threshold is 150°C with a hysteresis of 15°C.
