HM5669 Datasheet (H&M Semiconductor) - step-up DC/DC converter

HM5669, step-up DC/DC converter

HM5669 develops a step-up DC/DC converter that delivers an accurate constant current for driving LEDs.

Operating at a fixed switching frequency of 1MHz allows the device to be used with small value external ceramic capacitors and inductor.

The LED current is programmable through the external resist

HM5669 Features

* Input voltage range: 2.8 to 30V

* Switch current limit: 4A

* Drives LED strings up to 30V

* 1MHz fixed frequency minimizes the external components

* 20kHz~1MHz wide dimming frequency range for EN/PWM pin

* Internal softstart limits the inrush current