Overview
The TPS61169DCKR from Texas Instruments is a high-efficiency, high-current boost converter designed specifically for driving white LED (WLED) strings. This device is integrated with a 40V rated, 1.8A switch FET, making it suitable for small to large-size panel backlighting applications. It operates in a current mode scheme with a quasi-constant frequency of 1.2 MHz and supports input voltages as low as 2.7V and output voltages up to 38V. The TPS61169DCKR features pulse width modulation (PWM) control for dimming the LED current, ensuring silent operation without audible noise.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Input Voltage (VIN) | 2.7 | 5.5 | 5.5 | V |
| Output Voltage (VOUT) | 2.7 | - | 38 | V |
| Switch Peak Current Limit | - | - | 1.2 | A |
| LED Current Per Channel | - | - | 400 | mA |
| Operating Temperature Range | -40 | - | 85 | °C |
| PWM Dimming Signal Frequency | 5 | - | 100 | kHz |
| PWM Dimming Signal Duty Cycle | 1% | - | 100% | - |
| Switching Frequency | - | - | 1.2 | MHz |
| Package Type | - | - | SC70-5 | - |
Key Features
- High-Efficiency Boost Converter: Supports high output voltages up to 38V with a peak efficiency of 90%.
- PWM Dimming Control: Allows for adjustable LED current using a PWM signal, with a duty cycle range of 1% to 100%.
- Integrated Switch FET: 40V rated, 1.8A switch FET for driving single or parallel LED strings.
- Open LED Protection: Prevents the output voltage from exceeding the absolute maximum voltage ratings of the device.
- Thermal Shutdown: Automatically shuts down the device if the junction temperature exceeds 160°C and restarts when the temperature decreases by 15°C.
- Low Quiescent Current in Shutdown: Less than 2μA when the device is in shutdown mode.
- Compact Package: SC70-5 package for space-efficient designs.
Applications
- Panel Backlighting: Suitable for small to large-size panel backlighting in various display devices.
- Smartphones and Tablets: Commonly used in mobile devices for backlighting LCD screens.
- Portable Electronics: Ideal for battery-powered devices requiring efficient LED driving solutions.
- Display Systems: Used in various display systems where high-efficiency LED driving is necessary.
Q & A
- What is the input voltage range of the TPS61169DCKR?
The input voltage range is from 2.7V to 5.5V.
- What is the maximum output voltage supported by the TPS61169DCKR?
The maximum output voltage is 38V.
- How does the TPS61169DCKR support LED dimming?
The device supports PWM dimming with a duty cycle range of 1% to 100%.
- What is the switching frequency of the TPS61169DCKR?
The switching frequency is 1.2 MHz.
- What type of package does the TPS61169DCKR come in?
The device comes in a SC70-5 package.
- What is the operating temperature range of the TPS61169DCKR?
The operating temperature range is from -40°C to 85°C.
- Does the TPS61169DCKR have thermal protection?
Yes, it has an internal thermal shutdown that activates if the junction temperature exceeds 160°C.
- How much current does the TPS61169DCKR draw in shutdown mode?
The device draws less than 2μA in shutdown mode.
- What is the peak efficiency of the TPS61169DCKR?
The peak efficiency is 90%.
- Is the TPS61169DCKR RoHS compliant?
Yes, the device is RoHS compliant.
