HT7939 Overview
The HT7939 is a high efficiency boost converter for driving White LEDs using current mode operation. The device is designed to drive up to 39 White LEDs from a 5V power supply. The White LED current is setup using an external current setting resistor, which has a low feedback voltage of 0.2V to minimise power losses in the resistor which improves efficiency.
HT7939 Key Features
- Input range from 2.6V~5.5V
- Built-in Power MOSFET
- Can drive up to 39 White LEDs with a 5V input
- Low standby current: 0.1mA (typ.) with VEN low
- Integrated Over-voltage, Over-temperature and
- Under voltage lock-out protection
- 1.2MHz fixed switching frequency
- High efficiency
- up to 90%
- 6-pin SOT23-6 package