Sunnyvale, Calif. Maxim Integrated Products has introduced the MAX17061 8-string white LED (WLED) driver with an integrated MOSFET switch. This device uses an internal switch, current-mode, step-up controller to drive the LED array, which can be configured for up to eight parallel strings with ten LEDs per string.
To ensure even LED brightness, each string uses a current source that achieves ±1.5% current-balance accuracy between strings. The MAX17061 generates a DPWM signal for accurate WLED dimming control. The DPWM's signal is controlled through a PWM interface, a SMBus-compatible interface, or both, and for greater flexibility, the DPWM signal's frequency is set by an external resistor. The accuracy and control scheme of the MAX17061 make it suitable for WLED backlighting in notebook applications.
The MAX17061 features low feedback voltage at each LED string (625 mV at 25 mA LED current) to reduce power loss and improve efficiency. A selectable switching frequency (500 kHz, 750 kHz, or 1 MHz) allows designers to optimize efficiency relative to component size for their applications. The WLED driver also provides multiple protection features including output over-voltage, open-string, short-string, and thermal-shutdown protection.
The MAX17061 operates from a 4.5-V to 26-V input-voltage range, and provides a fixed (25 mA) or adjustable (15 mA to 30 mA) full-scale LED current. Available in a 4 x 4-mm, 28-pin TQFN package, the MAX17061 is fully specified over the -40° to +85° extended temperature range.
Pricing: Starts at $2.59 (1000-up, FOB USA). An evaluation kit is available.
Product information: MAX17061
Maxim Integrated Products , 1-800-998-8800, www.maxim-ic.com