NCP5010FCT1G

NCP5010 500 mW Boost Converter for White LEDs The NCP5010 is a fixed frequency PWM boost converter with integrated rectification optimized for constant current applications such as driving white LEDs. This device features small size, minimal external components and high−efficiency for use in portable applications and is capable of providing up to 500 mW output power to 2−5 series connected white LEDs. A single resistor sets the LED current and the CTRL pin can be pulse width modulated (PWM) to reduce the LED Current. The device includes True−Cutoff circuitry to disconnect the load from the battery when the device is put into standby mode. To protect the device, an output overvoltage protection, and short circuit protection have been incorporated. The NCP5010 is housed in a low profile, space efficient 1.7 x 1.7 mm Flip−Chip package. The device has been optimized for use with small inductors and ceramic capacitors. Features http://onsemi.com MARKING DIAGRAM A1 8−Pin Flip−Chip FC SUFFIX CASE 499AJ DAX G A Y WW DAXG AYWW 1 = Specific Device Code = Pb−Free Package = Assembly Location = Year = Work Week • 2.7 to 5.5 V Input Voltage Range • Efficiency: 84% for 5 LED (VF = 3.5 V by LED) at 30 mA and • • • • • • • • • • • 4.2 V VIN Low Noise 1 MHz PWM DC−DC Converter Open LED Protection and Short Circuit Protection Serial LEDs Architecture for Uniform Current Matching 1 mA Shutdown Current Facility with True−Cutoff Very Small 8−Pin Flip−Chip 1.7 x 1.7 mm Package This is a Pb−Free Device PIN CONNECTIONS A1 A2 A3 NC B3 FB C2 SW C3 PGND AGND CTRL B1 VIN C1 VOUT Typical Applications Top View White LED Backlighting for Small Color LCD Displays Cellular Phones Digital Cameras MP3 Players High Efficiency Step−up Converter ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 16 of this data sheet. 90 80 70 EFFICIENCY (%) 60 50 40 30 20 10 0 1 10 IOUT (mA) VIN = 4.2 V 100 VOUT = 5 LED (18 V) VOUT = 3 LED (11 V) Figure 1. Efficiency vs. Output Current © Semiconductor Components Industries, LLC, 2006 1 August, 2006 − Rev. 1 Publication Order Number: NCP5010/D NCP5010 Vbat 2.7 to 5.5 V Cin 4.7 mF 0603 X5R 6.3V C2 B1 L1 22 mH LED ENABLE A2 A3 CTRL AGND NC VOUT PGND C1 Cout 1 mF 0805 X5R 25V LED A1 NCP5010 C3 B3 FB Rfb 24 Figure 2. Typical Application Circuit PIN FUNCTION DESCRIPTION PIN A1 B1 PIN NAME AGND VIN TYPE POWER POWER DESCRIPTION System ground for the analog circuitry. A high quality ground must be provided to avoid spikes and/ or uncontrolled operations. This pin is to be connected to the PGND pin. Power Supply Input. A ceramic capacitor with a minimum value of 1 mF/6.3 V (X5R or X7R) must be connected to this pin. This capacitor should be placed as close as possible to this pin. In addition, one end of the external inductor is to be connected at this point. DC−DC converter output. This pin should be directly connected to the load and a low ESR (