Overview: NCP6361 Buck Converter with Bypass Mode for RF Power Amplifiers The NCP6361, a PWM synchronous step−down DC−to−DC converter, is optimized for supplying RF Power Amplifiers (PAs) used in 3G/4G wireless systems (Mobile / Smart Phones, Tablets,…) powered by single−cell Lithium−Ion batteries. The device is able to 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 control pin VCON. The analog control allows dynamically optimizing the RF Power Amplifier’s efficiency through the monitoring of the PA output power. With an improved overall system efficiency the munication time and phone autonomy can be consequently increased. At light load for optimizing the DC−to−DC converter efficiency, the NCP6361 enters automatically in PFM mode and operates in a slower switching frequency. The NCP6361 enters in bypass mode when the desired output voltage bees close to the input voltage (e.g.: low battery conditions). The device operates at 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). Synchronous rectification and automatic PFM / PWM / By−Pass 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 CSP−9 package. http://onsemi. MARKING DIAGRAM WLCSP9 CASE 567GM 6361x ALYWW
G 6361x = Specific Device Code x = A or B
A = Assembly Location L = Wafer Lot Y = Year WW = Work Week G = Pb−Free Package ORDERING INFORMATION
See detailed ordering, marking and shipping information on page 19 of this data sheet.
