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CM9156B Datasheet(PDF) 1 Page - California Micro Devices Corp |
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CM9156B Datasheet(HTML) 1 Page - California Micro Devices Corp |
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1 / 13 page  © 2006 California Micro Devices Corp. All rights reserved. 04/26/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com 1 CM9156B PRELIMINARY Features • 3.0V to 6.5V input voltage range • Dual mode operation; 1x and 1.5x • Fixed 4.5V output with initial accuracy of ± 2% • Supports up to 180mA (@4V) output • High efficiency at both high and low input voltage • Low external parts count, requires no inductor • PWM brightness control via the ENA pin • Selectable 262kHz or 650kHz switching frequency • Low shutdown current of <1µA • Soft start prevents excessive inrush current • Over-temperature and over-current protection • Low output ripple (<1%), low EMI • Input protection provides superior ESD rating, requiring only standard handling precautions • TDFN-10 or MSOP-10 package • Optional RoHS compliant lead free package Applications ² Drive white LEDs to backlight color LCDs ² Drive white or RGB LEDs for camera flash ² Cellular phones ² MP3 players •PDAs, GPS Product Description CM9156B is an efficient 1.5x switched capacitor (charge pump) regulator ideal for white LED applica- tions. It has a regulated 4.5V, 120mA output, capable of driving up to six parallel white LEDs. With a typical operating input voltage range from 3.0V to 6.0V, the CM9156B can be operated from a single-cell Li-Ion battery. It features an efficient, 1.5x charge-pump circuit that uses only two 1.0µF ceramic bucket capacitors and two small capacitors for VIN and VOUT. The CM9156B offers a selectable switching frequency of 262kHz or 650kHz. The LED brightness can be adjusted by apply- ing a PWM signal on the ENA pin. The CM9156B output voltage is regulated to 4.5V, ± 5% over the line and load ranges. Up 180mA of output current is available. The proprietary design architec- ture maintains high efficiency (> 80%), and at low VIN provides longer battery life. With a high VIN, or when the adapter is powered, it provides cool reliable opera- tion. It offers low output voltage ripple, typically less than 50mV. Internal over-temperature and over-current management provide short circuit protection. The CM9156B is packaged in either a space saving 10-Lead TDFN or 10-Lead MSOP package. It can operate over the industrial temperature range of – 25-°C to 85-°C. . 1.0uF 1.0uF 4.5V 3.0V to 6.0V 1.0uF C1P VOUT VIN CL K C1N C2P GND ENA C2N CM9156B 1.0uF PhotonICTM Typical Application Charge-Pump White LED Driver |
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