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NCP1521

ON Semiconductor
Part Number NCP1521
Manufacturer ON Semiconductor
Description Adjustable Output Voltage Step-Down Converter
Published Jan 16, 2007
Detailed Description NCP1521 1.5 MHz, 600 mA, High-Ef ficiency, Low Quiescent Current, Adjustable Output Voltage Step-Down Converter The NCP...
Datasheet PDF File NCP1521 PDF File

NCP1521
NCP1521

Overview
NCP1521 1.
5 MHz, 600 mA, High-Ef ficiency, Low Quiescent Current, Adjustable Output Voltage Step-Down Converter The NCP1521 step- down PWM DC- DC converter is optimized for portable applications powered from one cell Li- ion or three cell Alkaline/NiCd/NiMH batteries.
The device is available in an adjustable output voltage from 0.
9 V to 3.
3 V.
It uses synchronous rectification to increase efficiency and reduce external part count.
The device also has a built- in 1.
5 MHz (nominal) oscillator which reduces component size by allowing a small inductor and capacitors.
Automatic switching PWM/PFM mode offers improved system efficiency.
Finally, it includes an integrated soft-start, cycle-by-cycle current limiting, and thermal shutdown protection.
The NCP1521 is available in space saving, low profile TSOP5 package.
Features •ă95.
3% of Efficiency for 3.
3 V Output and 4.
2 V Input and 80 mA Load-Current •ăSources up to 600 mA •ă1.
5 MHz Switching Frequency •ăAdjustable Output Voltage from 0.
9 V to 3.
3 V •ă30 mA Quiescent Current •ăSynchronous Rectification for Higher Efficiency •ă2.
7 V to 5.
5 V Input Voltage Range •ăThermal Limit Protection •ăShutdown Current Consumption of 0.
3 mA •ăShort Circuit Protection •ăThis is a Pb-Free Device Typical Applications •ăCellular Phones, Smart Phones and PDAs •ăDigital Still/Video Cameras •ăMP3 Players and Portable Audio Systems •ăWireless and DSL Modems •ăPortable Equipment •ăUSB Powered Devices VIN CIN OFF ON 1 VIN LX 5 2 GND 3 EN FB 4 L COUT VOUT R1 Cff R2 http://onsemi.
com MARKING DIAGRAM 5 1 TSOP-5 SN SUFFIX CASE 483 5 DBPAYWG G 1 DBP = Specific Device Code A = Assembly Location Y = Year W = Work Week G = Pb-Free Package (Note: Microdot may be in either location) ORDERING INFORMATION Device Package Shipping NCP1521ASNT1G TSOP-5 3000/Tape & Reel (Pb-Free) †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD...


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