NCP5005GEVB

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The chip has been optimized for small ceramic capacitors, capable to supply up to 1.0 W output power. www.onsemi.com MARKING DIAGRAM Features • 2.7 to 5.5 V Input Voltage Range • Vout to 24 V Output Compliance Allows up to 5 LEDs Drive in • • • • • • • • • • • • Series Built−in Overvoltage Protection Full EMI Immunity Inductor Based Converter brings up to 90% Efficiency Constant Output Current Regulation 0.3 mA Standby Quiescent Current Includes Dimming Function (PWM) Enable Function Driven Directly from Low Battery Voltage Source Automatic LEDs Current Matching Thermal Shutdown Protection All Pins are Fully ESD Protected Low EMI Radiation Pb−Free Package is Available 5 TSOP−5 SN SUFFIX CASE 483 5 1 DBNAYWG G 1 DBN = Device Code A = Assembly Location Y = Year W = Work Week G = Pb−Free Package (Note: Microdot may be in either location) PIN CONNECTIONS Vout 1 GND 2 FB 3 Typical Applications 5 Vbat 4 EN (Top View) • LED Display Back Light Control • Keyboard Back Light • High Efficiency Step Up Converter ORDERING INFORMATION Device Package Shipping† NCP5005SNT1G TSOP−5 (Pb−Free) 3000 Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. © Semiconductor Components Industries, LLC, 2005 November, 2005 − Rev. 1 1 Publication Order Number: NCP5005/D NCP5005 Vbat Vbat U1 4 EN Vbat C1 5 4.7 mF L1 22 mH 2 GND GND 3 Vout FB GND D1 1 MBR0530 NCP5005 R1 GND D6 C2 1.0 mF D5 D4 D3 D2 15 W LWT67C LWT67C LWT67C LWT67C LWT67C GND Figure 1. Typical Application Thermal Shutdown Current Sense Vbat 5 Vbat CONTROLLER Vsense EN 4 100 k GND FB 3 300 k 1 Vout Q1 2 GND + GND +200 mV Band Gap Figure 2. Block Diagram www.onsemi.com 2 NCP5005 PIN FUNCTION DESCRIPTION Pin Pin Name Type Description 1 Vout POWER This pin is the power side of the external inductor and must be connected to the external Schottky diode. It provides the output current to the load. Since the boost converter operates in a current loop mode, the output voltage can range up to +24 V but shall not extend this limit. However, if the voltage on this pin is higher than the Over Voltage Protection threshold (OVP) the device comes back to shutdown mode. To restart the chip, one must either send a Low to High sequence on Pin EN, or switch off the Vbat supply. A capacitor must be used on the output voltage to avoid false triggering of the OVP circuit. This capacitor should be 1.0 mF minimum. Ceramic type, (ESR