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NCP1509

ON Semiconductor
Part Number NCP1509
Manufacturer ON Semiconductor
Description High Efficiency Synchronous Step-Down DC-DC Converter
Published Jun 17, 2010
Detailed Description NCP1509 Up to 500 mA, 1 MHz, High Efficiency Synchronous Step−Down DC−DC Converter in DFN Package The NCP1509 step−dow...
Datasheet PDF File NCP1509 PDF File

NCP1509
NCP1509

Overview
NCP1509 Up to 500 mA, 1 MHz, High Efficiency Synchronous Step−Down DC−DC Converter in DFN Package The NCP1509 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 NCP1509 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 1 MHz (nominal) 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 NCP1509 is available in a space saving, low profile 3x3 mm 10 pin DFN package.
Features • High Efficiency: 92.
5% for 1.
8 V Output at 3.
6 V Input and 125 mA Load Current 91% for 1.
8 V Output at 3.
6 V Input and 300 mA Load Current • Digital Programmable Output Voltages: 1.
05, 1.
35, 1.
57 or 1.
8 V • Output Current up to 500 mA at Vin = 3.
6 V • Low Quiescent Current of 14 mA in Pulsed Switching Mode • Low 0.
2 mA Shutdown Current • −30°C to 85°C Operation Temperature • Low Profile DFN Package • Pb−Free Package is Available Application • Cellular Phones, Smart Phones and PDAs • Digital Still Cameras • MP3 Players and Portable Audio Systems • Wireless and DSL Modems • Portable Equipment 100 90 80 Vin 2.
7 V − 5.
2 V 5 VCC Cin 4 VCCP 10 mH 9 SHD 10 SYNC LX FB CB1 CB0 3 6.
8 mH 6 Vout Cout 22 mH 8 7 CB0 and CB1 Control Input EFFICIENCY (%) 70 60 50 40 30 20 GNDA GNDP 10 0 0.
001 Figure 1.
Typical Application Circuit http://onsemi.
com MARKING DIAGRAM 1 10 PIN DFN 1509 MN SUFFIX ALYW 1 CASE 485C 1509 = Specific Device Code A = Assembly Location L = Wafer Lot Y = Year W = Work Week ORDERING INFORMATION Device Package...


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