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LPO4812 Datasheet(PDF) 1 Page - ON Semiconductor |
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LPO4812 Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 16 page © Semiconductor Components Industries, LLC, 2005 January, 2005 − Rev. 5 1 Publication Order Number: NCP1511/D NCP1511 Up to 500 mA, High Efficiency Synchronous Step−Down DC−DC Converter in Chip Scale Package The NCP1511 step−down PWM DC−DC converter is optimized for portable applications powered from 1−cell Li−ion or 3−cell Alkaline/NiCd/NiMH batteries. This DC−DC converter utilizes a current−mode control architecture for easy compensation and better line regulation. It also uses synchronous rectification to increase efficiency and reduce external part count. The NCP1511 optimizes efficiency in light load conditions when switched from a normal PWM mode to a “pulsed switching” mode. The device also has a built−in oscillator for the PWM circuitry, or it can be synchronized to an external 500 kHz to 1000 kHz clock signal. Finally, it includes an integrated soft−start, cycle−by−cycle current limiting, and thermal shutdown protection. The NCP1511 is available in a chip scale package. Features • High Efficiency: 93% for 1.89 V Output at 3.6 V Input and 150 mA Load Current 92% for 1.89 V Output at 3.6 V Input and 300 mA Load Current • Digital Programmable Output Voltages: 1.0, 1.3, 1.5 or 1.89 V • Output Current up to 500 mA at V in = 3.6 V • Low Quiescent Current of 14 mA in Pulsed Switching Mode • Low 0.1 mA Shutdown Current • −30°C to 85°C Operation Temperature • Ceramic Input/Output Capacitor • 9 Pin Chip Scale Package • Pb−Free Package is Available Applications • Cellular Phones, Smart Phones and PDAs • Digital Still Cameras • MP3 Players and Portable Audio Systems • Wireless and DSL Modems • Portable Equipment DAL AYWW A1 http://onsemi.com Device Package Shipping† ORDERING INFORMATION NCP1511FCT1 3000 Tape & Reel 9 PIN MICRO BUMP FC SUFFIX CASE 499AC MARKING DIAGRAM Micro Bump XX = Device Code A = Assembly Location Y = Year WW = Work Week C1 C2 C3 B1 B2 B3 A1 A2 A3 Pin: A1. − GNDP A2. − LX A3. − VCC B1. − SYNC B2. − GNDA B3. − FB C1. − SHD C2. − CB1 C3. − CB0 (Bottom View) PIN CONNECTIONS NCP1511FCT1G 3000 Tape & Reel Micro Bump (Pb−Free) A1 †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. Figure 1. Typical Application Circuit VCC SHD SYNC GNDA GNDP CB0 CB1 FB LX Vin 2.5 V − 5.2 V 6.8 mH Vout CB0 and CB1 Control Input Cin 10 mF Cout 22 mF A3 C1 B1 B2 A1 C3 C2 B3 A2 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 PWM Mode Pulsed Mode Iout (mA) Figure 2. Efficiency vs. Output Current Vin = 3.6 V Vout = 1.5 V TA= 25°C |
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