TF4601 - 1 MHz Asynchronous Step-up Regulator White LED Driver

Product Type: LED Driver
Current Status: Final

Product Overview
The TF4601 is a monolithic asynchronous boost regulator. An integrated
500 mΩ Power MOSFET drives up to 10 WLEDs in series or up to 13 parallel strings of 3 WLEDs. It operates at fixed 1 MHz switching frequency, maximizing conversion efficiency, enabling smaller external components and reducing output ripple. The TF4601 features an integrated soft-start function that minimizes inrush current during turn-on. Under-voltage lockout, over-voltage and over-temperature protection features are added for system robustness.
The TF4601 is available with two internal voltage references. A versions with a 104 mV reference offer highest efficiency, while B versions with 300 mV reference offer improved accuracy. The current mode control loop is compensated internally minimizing the number of external components.
The TF4601 is offered in space saving 8-pin QFN and 6-pin TSOT23 packages. It operates over the industrial temperature range of -40 °C to +85 °C temperature range.

Features

• Drives up to 10 WLEDs in series or up to 13 parallel strings of 3 WLEDs for display backlightingWide input voltage range: 2.5V to 6V
• High efficiency enabled by an integrated 500 mΩ power MOSFET switchAvailable with two internal voltage references:
  - Version A (104 mV) offers improved efficiency
  - Version B (300 mV) offers improved accuracy
• Operates at fixed 1 MHz frequency for small filter size
• 3 μA typical shut-down supply current
• Integrated soft-start function, 45V / 20V over-voltage protection, over-temperature protection and input under-voltage lockout
• Industrial temperature range: -40 °C to +85 °C
• Available in space saving QFN-8 and TSOT23-6 packages