UM1351

UM1351 Hysteretic Buck High Brightness LED Driver with Internal Switch UM1351Y SOT89-5 UM1351S SOT23-5 General Description The UM1351 is a PWM step-down converter with internal power switch, designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The UM1351 can drive up to 8 series connected LEDs. The device operates from an input supply between 6V and 35V and employs hysteretic control with a high side current sense resistor to set the constant output current up to 700mA. The device is well suited for applications requiring a wide input range. The high side current sensing and an integrated current sensing circuitry minimize the number of external components while delivering an accurate average output current. Depending upon supply voltage and external components, this device can provide up to 24 watts of output power. Output current can be adjusted below the set value, by applying an external control signal to the...