HM3442 Datasheet PDF - Shenzhen Huazhimei Semiconductor Co., Ltd

Overview
   HM3442 is a buck-boost LED constant current driver chip, especially suitable for LED lamps powered by lithium batteries or three dry batteries.
   When the power supply voltage is lower than the LED lamp’s conduction voltage, HM3442 operates in a boost state; when the power supply voltage is higher than the LED lamp’s conduction voltage, HM3442 operates in a buck state.

FEATUREs
➢ Operating voltage: 2.4V~5.5V
➢ LED current: less than 500mA
➢ LED current is set by external resistor
➢ Efficiency: up to 90%
➢ Undervoltage protection voltage: 2.4V
➢ Open circuit protection voltage: 5V
➢ Current accuracy: ±5%

APPLICATION areas
➢ Lithium battery powered LED lamps
➢ Three dry cell battery powered LED lamps