HM3348
HM3348 is Boost LED Driver manufactured by H&M Semiconductor.
Boost LED Driver
Features
- Input Voltage Range: 2.2V to 6V
- Programmable LED Current
- Drives LEDs up to 27V
- Switching Frequency: up to 800k Hz
- Wide Dimming Frequency Range: 20k Hz to
360k Hz
- Programmable Overvoltage Protection
- Tiny SOP8/PP Package
Applications
- PDA
- Cellular Phones
- Handheld Devices
- MP3 Players
- GPS Receivers
Description
The H0 is a step-up DC/DC converter with a constant current to drive white LEDs or similar. The device can drive up to eight LEDs in series from a Li-Ion cell. The LED current is set by the external resistor (RSET) and is directly regulated by the feedback (FB) voltage (typ: 200m V) across the external resistor RSET.
To ensure maximum safety during operation, the output has integrated overvoltage protection that prevents damage to the device in case of some fault conditions. The OVP voltage can be programmed by two external resistors.
The H0 is available in a tiny SOP8/PP package.
Typical Application Circuit
- ILED=200m V/ RSET.
- This application circuit is applied to PWM dimming.
- This application circuit is applied to PWM dimming.
Pin Assignment
Top View
NAME
3,4,9
5,6
SOP8/PP...
