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NCP6361 Buck Converter with Bypass Mode for RF Power Amplifiers The NCP6361, a PWM synchronous step down DC to DC www.onsemi.com converter, is optimized for supplying RF Power Amplifiers (PAs) used in 3G/4G wireless systems (Mobile / Smart Phones, Tablets,) MARKING powered by singlecell LithiumIon batteries. The device is able to DIAGRAM deliver up to 2 A current in bypass mode and 800 mA in buck mode. The output voltage is monitorable from 0.4 V to 3.5 V by an analog 6361x control pin VCON. The analog control allows dynamically optimizing ALYWW WLCSP9 the RF Power Amplifiers efficiency through the monitoring of the PA CASE 567GM output power. With an improved overall system efficiency the communication time and phone autonomy can be consequently 6361x = Specific Device Code increased. At light load for optimizing the DCtoDC converter x = A or B A = Assembly Location efficiency, the NCP6361 enters automatically in PFM mode and L = Wafer Lot operates in a slower switching frequency. The NCP6361 enters in Y = Year bypass mode when the desired output voltage becomes close to the WW = Work Week input voltage (e.g.: low battery conditions). The device operates at = PbFree Package 3.429 MHz or 6 MHz switching frequency. This way the system tuning can focus respectively either on a better efficiency (3.249 MHz) or on employing smaller value inductor and capacitors (6 MHz). ORDERING INFORMATION See detailed ordering, marking and shipping information on Synchronous rectification and automatic PFM / PWM / ByPass page 20 of this data sheet. operating mode transitions improve overall solution efficiency. The NCP6361 has two versions: NCP6361A and NCP6361B. Version B has a spread spectrum function for low EMI operation. The NCP6361 is available in a space saving, low profile 1.36 x 1.22 mm CSP9 package. Features Input Voltage from 2.5 V to 5.5 V for Battery Powered Low 45 A Quiescent Current Applications Thermal Protections to Avoid Damage of the IC Adjustable Output Voltage (0.4 V to 3.50 V) Small 1.36 x 1.22 mm / 0.4 mm Pitch CSP Package 3.429 / 6 MHz Selectable Switching Frequency This is a PbFree Device Uses 470 nH Inductor and 4.7 F Capacitor for Typical Applications Optimized Footprint and Solution Thickness 3G / 4G Wireless Systems, SmartPhones and Webtablets PFM /PWM/Bypass Automatic Mode Change for High Efficiency Semiconductor Components Industries, LLC, 2014 1 Publication Order Number: April, 2014 Rev. 5 NCP6361/D