A Product Line of Diodes Incorporated PAM2803 3W HIGH POWER WHITE LED DRIVER Description Pin Assignments The PAM2803 is a step-up DC-DC converter that delivers a regulated output current. The device switches at a 1.0MHz constant frequency, allowing for the use of small value external inductor and ceramic capacitors. The PAM2803 is targeted to be used for driving loads up to 1A from a two-cell alkaline battery. The LED current can be programmed by the external current sense resistor, R , connected between the feedback S pin (FB) and ground. A low 95mV feedback voltage reduces the power loss in the Rs for better efficiency. With its internal 2A, 100m NMOS switch, the device can provide high efficiency even at heavy load. During the shutdown mode, the feedback resistor R and the S load are completely disconnected and the current consumption is reduced to less than 1A. The PAM2803 is available in the 6-lead SOT23-6 package. Applications Features White LED Torch (Flashlight) LED Power Efficiency: up to 90% Current Accuracy: 5%(V = 3.6V to 1.8V V = 3.7V) White LED Camera Flash IN F Low Start-Up Voltage: 0.9V (I = 270mA) DSC (Digital Still Camera) Flash LED Low Hold Voltage: 0.75 (I = 200mA) Cellular Camera Phone Flash LED 1MHz Switching Frequency PDA Camera Flash Uses Small, Low Profile External Components Camcorder Torch (Flashlight) Lamp Low R : 100m (typ) DS(ON) Over Temperature Protection Low Profile SOT23-6 Package Pb-Free Package Typical Applications Circuit ILED = 750mA, RS = 0.127 1 of 9 PAM2803 December 2014 Diodes Incorporated www.diodes.com Document number: DS36400 Rev. 2 - 2 A Product Line of Diodes Incorporated PAM2803 Pin Description Pin Pin Function Number Name SW Switch 1 2 GND Ground 3 FB Feedback 4 SHDN Shut Down 5 VOUT Output 6 VIN Input Block Diagram Absolute Maximum Ratings ( T = +25C, unless otherwise specified.) A These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. All voltages are with respect to ground. Parameter Rating Unit Input Pin Voltage -0.3 to +6 SW Pin Voltage -0.3 to +6 V SHDN, FB Pin Voltage -0.3 to +6 Operating Temperature Range -40 to +85 Storage Temperature Range -65 to +125 C Lead Temperature (Soldering, 5 sec) 300 Recommended Operating Conditions ( T = +25C, unless otherwise specified.) A Parameter Rating Unit Junction Temperature -40 to +125 C Ambient Temperature -40 to +85 2 of 9 PAM2803 December 2014 Diodes Incorporated www.diodes.com Document number: DS36400 Rev. 2 - 2