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NCP1450ASN27T1 Datasheet(PDF) 1 Page - ON Semiconductor |
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NCP1450ASN27T1 Datasheet(HTML) 1 Page - ON Semiconductor |
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1 / 22 page  © Semiconductor Components Industries, LLC, 2005 December, 2005 − Rev. 7 1 Publication Order Number: NCP1450A/D NCP1450A PWM Step−up DC−DC Controller The NCP1450A series are PWM step−up DC−DC switching controller that are specially designed for powering portable equipment from one or two cells battery packs. The NCP1450A series have a driver pin, EXT pin, for connecting to an external transistor. Large output currents can be obtained by connecting a low ON−resistance external power transistor to the EXT pin. The device will automatically skip switching cycles under light load condition to maintain high efficiency at light loads. With only six external components, this series allows a simple means to implement highly efficient converter for large output current applications. Each device consists of an on−chip Pulse Width Modulation (PWM) oscillator, PWM controller, phase−compensated error amplifier, soft−start, voltage reference, and driver for driving external power transistor. Additionally, a chip enable feature is provided to power down the converter for extended battery life. The NCP1450A device series are available in the TSOP−5 package with five standard regulated output voltages. Additional voltages that range from 1.8 V to 5.0 V in 100 mV steps can be manufactured. Features • High Efficiency 86% at IO = 200 mA, VIN = 2.0 V, VOUT = 3.0 V 88% at IO = 400 mA, VIN = 3.0 V, VOUT = 5.0 V • Low Startup Voltage of 0.9 V typical at IO = 1.0 mA • Operation Down to 0.6 V • Five Standard Voltages: 1.9 V, 2.7 V, 3.0 V, 3.3 V, 5.0 V with High Accuracy ± 2.5% • Low Conversion Ripple • High Output Current up to 1000 mA (3.0 V version at VIN = 2.0 V, L = 10 mH, COUT = 220 mF) • Fixed Frequency Pulse Width Modulation (PWM) at 180 kHz • Chip Enable Pin with On−chip 150 nA Pullup Current Source • Low Profile and Micro Miniature TSOP−5 Package • Pb−Free Packages are Available Typical Applications • Personal Digital Assistant (PDA) • Electronic Games • Portable Audio (MP3) • Digital Still Cameras • Handheld Instruments TSOP−5 SN SUFFIX CASE 483 See detailed ordering and shipping information in the ordering information section on page 3 of this data sheet. ORDERING INFORMATION MARKING DIAGRAM AND PIN CONNECTIONS 1 3 GND CE 2 OUT NC 4 EXT 5 (Top View) xxx =Specific Device Marking A = Assembly Location Y = Year W = Work Week G = Pb−Free Package (Note: Microdot may be in either location) 1 5 http://onsemi.com |
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