NCP5009

NCP5008, NCP5009 Backlight LED Boost Driver The NCP5008/NCP5009 is a high efficiency boost converter operating in current loop control mode to drive Light Emitting Diode. The current mode regulation allows a uniform brightness of the LEDs. Features 2.7 to 6.0 V Input Voltage Range Output Voltage from Vbat to 15 V 3.0 mA Quiescent Supply Current Automatically LEDs Current Matching No External Sense Resistor Includes Dimming Function Programmable or Automatic Current Output Mode LOCAL or REMOTE Control Facility Photo Transistor Sense Feedback Input Inductor Based Converter brings High Efficiency Low Noise DC/DC Converter All Pins are Fully ESD Protected Pb−Free Package is Available Typical Applications LED Display Back Light Control High Efficiency Step Up Converter Vbat R1 30 k GND U1 1 Iref 2 PHOTO C1 Vbat 10 9 L1 10 mF/6.3 V GND Q1 NPN−PHOTO Vbat GND Vcc 4 3 5 VBIAS CS CLK NCP5009 D1 D2 8 L2 7 GND 6 LOCAL D3 D4 L1 22 mH D5 MBR0520 GND MICROCONTROLLER LED LED LED LED GND C2 GND 2.2 mF/16 V Figure 1. Typical Battery Powered LED Boost Driver http://onsemi.com MARKING DIAGRAM Micro 10 DM SUFFIX 5Tx AYW G 1 CASE 846B G 1 5Tx = Device Number x = 8 or 9 A = Assembly Location Y = Year W = Work Week G = Pb−Free Package (Note: Microdot may be in either location) PIN CONNECTIONS Iref NC CS VBIAS CLOCK 1 2 3 4 5 10 Vbat 9 L1 8 L2 Iout 7 GND 6 LOCAL NCP5008 Iref Photo CS VBIAS CLOCK 1 2 3 4 5 10 Vbat 9 L1 8 L2 Iout 7 GND...