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ACT6357/ACT6358

High Efficiency, 40V PWM Step-Up WLED Bias Supplies in TDFN33-8

GENERAL DESCRIPTION

The ACT6357 and ACT6358 step-up DC/DC converters drive white LEDs with an externally programmable constant current. These devices feature integrated, 40V power MOSFETs that are capable of driving up to ten white LEDs in series, providing inherent current matching for uniform brightness. WLED brightness adjustment is easily achieved via a dual-function pin, which accepts either a PWM or an analog dimming control signal.

The ACT6357 and ACT6358 feature a variety of protection circuits, including integrated over voltage protection (OVP), programmable soft-start, cycle-by-cycle current limiting, and thermal shutdown protection circuitry.

The ACT6357 has 500mA current limit, while the ACT6358 has 1A current limit. Both parts are available in a small 3mm x 3mm 8-pin TDFN33-8.

For more information download the ACT6357/6358 Data Sheet or contact your local Active-Semi sales associate.

KEY BENEFITS

Provides 0.5A and 1A peak inductor current in a TDFN33-8 package

Minimum off-time control with integrated power MOSFET ensures compact design with minimal external component for the smallest footprint

Internal 40V power MOSFET guarantee the applications up to 10 WLEDs per string

Flexible soft-start make operation to be easily stable

Achieve dimming control by connecting DC voltage or PWM signal to BC pin

RELATED PRODUCTS

Various pin-compatible and functional upgrade products available:

ACT6359: 2.6V to 5.5V input, 500mA peak inductor current, SOT23-6 package

ACT6360: 2.6V to 5.5V input, 1A peak inductor current, SOT23-6 package