PR4404

LED DRIVER PR4404 Low Voltage Boost Driver PR4404 for 0.5W / 1W Power LEDs The PR4404 is a step-up converter for white LEDs, operating with single battery cell supply (1.2/1.5V) at up to 150mA LED current or dual cell supply (2.4/3.0V) at up to 300mA LED current. A minimum part count allows compact and cost-efficient solutions. The converter can be switched on and off with a logic signal, which is useful e.g. for PWM control, timer circuits etc. Features minimum startup voltage 1.0V supply by one or two battery cells low number of external components battery deep discharge protection Applications LED torches LCD panel backlighting home lighting toys Typical Application Circuit Pin Description PR4404 SW Vout Vcc Vs Pin No 1 2 3 4 5 6 7 8 Pin Name SW Vout Vcc Vs Hold Gnd (A) Gnd (sub) Gnd (S) Pin Function Description driver output output voltage, rectified battery supply input LED cathode / current sense resistor shutdown ground (analog)* ground (substrate)* ground (power)* 1 SZ22v10 lot code date code 2 3 4 8 7 6 5 Gnd(S) Gnd(sub ) Gnd(A) Hold *Pins 6, 7, 8 must all be connected. © PREMA Semiconductor GmbH 2008 Page 1/12 PRELIMINARY DATA Rev 3408 Free Datasheet http://www.datasheet4u.com/ LED DRIVER PR4404 Block Diagram Absolute Maximum Ratings Parameter VCC (no damage) SW output peak current Operating junction temperature Storage Temperature Range Electrostatic Discharge (ESD) Protection -20 -55 2 Min -0.3 Typ Max 8 1.5 125 150 Units V A ° C...