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NCP1521B

ON Semiconductor
Part Number NCP1521B
Manufacturer ON Semiconductor
Description Step-Down DC-DC Converter
Published Apr 25, 2007
Detailed Description Buck Converter - DC-DC 1.5 MHz, 600 mA NCP1521B The NCP1521B step−down DC−DC converter is a monolithic integrated circ...
Datasheet PDF File NCP1521B PDF File

NCP1521B
NCP1521B

Overview
Buck Converter - DC-DC 1.
5 MHz, 600 mA NCP1521B The NCP1521B step−down DC−DC converter is a monolithic integrated circuit optimized for portable applications powered from one cell Li−Ion or three cell Alkaline/NiCd/NiMH batteries.
The part, available in adjustable output voltage versions ranging from 0.
9 V to 3.
9 V, is able to deliver up to 600 mA.
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 smaller inductors and capacitors.
Automatic switching PWM/PFM mode offers improved system efficiency.
Additional features include integrated soft−start, cycle−by−cycle current limiting and thermal shutdown protection.
The NCP1521B is available in a space saving, low profile TSOP5 package.
Features • Up to 96% Efficiency • Best−In−Class Ripple, including PFM Mode • Sources up to 600 mA • 1.
5 MHz Switching Frequency • Adjustable Output Voltage from 0.
9 V to 3.
9 V • Synchronous Rectification for Higher Efficiency • 2.
7 V to 5.
5 V Input Voltage Range • Low Quiescent Current • Shutdown Current Consumption of 0.
3 mA • Thermal Limit Protection • Short Circuit Protection • All Pins are Fully ESD Protected • This is a Pb−Free Device Typical Applications • Cellular Phones, Smart Phones and PDAs • Digital Still/Video Cameras • MP3 Players and Portable Audio Systems • Wireless and DSL Modems • Portable Equipment • USB Powered Devices VIN CIN OFF ON 1 VIN LX 5 2 GND 3 EN FB 4 L COUT VOUT R1 Cff R2 Figure 1.
Typical Application − TSOP−5 DATA SHEET www.
onsemi.
com 5 1 TSOP−5 SN SUFFIX CASE 483 MARKING DIAGRAM 5 GALAYWG G 1 GAL = 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† NCP1521BSNT1G TSOP−5 3000/Tape & Reel (Pb−Free) †For information on tape and reel specifications, including part orienta...


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