Overview
The TPS61043DRBT is a high-frequency boost converter with constant current output, designed to drive white LEDs or similar devices. This component, produced by Texas Instruments, operates as a current source with integrated overvoltage protection, making it ideal for LED applications. It can generate output voltages up to 18 V and features an internal 400 mA MOSFET switch, allowing it to power up to four LEDs in series. The device is controlled via a PWM signal or an analog signal, enabling precise brightness control. It is available in a small 3-mm × 3-mm QFN package, making it suitable for compact designs in handheld devices.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 1.8 | 6 | V | |
| Output Voltage Range | 16.9 | V | ||
| Maximum Switch Voltage | 30 | V | ||
| Maximum LED Switch Current | 60 | mA | ||
| MOSFET ON-Resistance | 1-2 | Ω | ||
| Switching Frequency | up to 1 MHz | |||
| No Load Quiescent Current | 38 | µA | ||
| Shutdown Current | 0.1 | µA | ||
| Package Size | 3-mm × 3-mm QFN |
Key Features
- Powers up to 4 LEDs in series with an input voltage range of 1.8 V to 6 V.
- Internal 30-V switch and up to 85% efficiency.
- Precise brightness control using PWM signal or analog signal.
- Integrated overvoltage protection (OVP) to prevent damage.
- Internal power MOSFET switch with a maximum current rating of 400 mA.
- Operates with small output capacitors down to 100 nF.
- Disconnects LEDs during shutdown to prevent leakage currents.
- Undervoltage lockout and thermal shutdown for safety.
- Softstart feature to limit in-rush current during start-up.
Applications
The TPS61043DRBT is suitable for various handheld devices, including:
- White LED supply for display backlight and sidelight in PDAs, pocket PCs, and smartphones.
- Cellular phones and other portable electronic devices.
Q & A
- What is the input voltage range of the TPS61043DRBT?
The input voltage range is from 1.8 V to 6 V. - How many LEDs can the TPS61043DRBT power in series?
It can power up to 4 LEDs in series. - What is the maximum output voltage of the TPS61043DRBT?
The maximum output voltage is typically 16.9 V with OVP. - How is the brightness of the LEDs controlled?
The brightness can be controlled using a PWM signal or an analog signal. - What is the maximum current rating of the internal MOSFET switch?
The maximum current rating is 400 mA. - What safety features does the TPS61043DRBT include?
It includes integrated overvoltage protection (OVP), undervoltage lockout, and thermal shutdown. - What is the typical quiescent current during no-load operation?
The typical no-load quiescent current is 38 µA. - What is the shutdown current of the device?
The shutdown current is typically 0.1 µA. - What package size is the TPS61043DRBT available in?
It is available in a 3-mm × 3-mm QFN package. - How does the softstart feature work?
The softstart feature limits the in-rush current during start-up by increasing the current limit in two steps.
