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HM5669 - step-up DC/DC converter

Description

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.

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.
  • Open LED over voltage protection.

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Full PDF Text Transcription

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HM5669 General Description 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 resistor. The device also supports PWM dimming for accurate LED current control. HM5669 is ideal for driving up to eight white LEDs in series or up to 30V. Ordering Information □(□□)□HM5669 Temperature Code Package Code Optional Spec Code Temperature Range: -40°C to 85°C Ordering Number Package type HM5669 DFN3X3-10 Note Typical Applications Features • Input voltage range: 2.
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