NCP1521 Datasheet Text
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 ponent 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...