MB39C326 6MHz Synchronous Rectification Buck-Boost DC/DC Converter IC Fact Sheet MB39C326 was designed for the RF power amplifier of the mobile device that used 1-cell Li-ion battery. It is high-efficiency and low noise 6 MHz buck-boost DC/DC converter IC. The size of the inductor can be greatly reduced to 2-3MHz existing product by operating by the high frequency of 6MHz. Therefore, it becomes possible to reduce the substrate area of the power supply part by half. The range of the voltage that can be used can be expanded by automatic switching operation of the buck-boost circuit, and a steady power supply to the power amplifier can be supplied. Ordering Information Features Package High efficiency: Up to 93% Part number Input voltage range: 2.5 V to 5.5 V 20-pin plastic WL-CSP Adjustable output voltage range: 0.8 V to 5.0 V (WLP-20P-M01) MB39C326PW 0.4 mm-ball-pitch Over current limit value (Peak): 3.1A/1.3A/0.49A 2.15 mm 1.94 mm Output current: 1200mA (Buck, output at 3.3V) 800mA (Boost, output at 3.3V) 6MHz PWM operation allows 0.5 H small form inductor Package Example of Reference Less than 20 s step response for 3G Automatic Transition between buck mode and boost mode Selectable output voltage with external resistor Built-in Over temperature protection circuit Built-in Under voltage lockout protection circuit Package: 20-pin, WL-CSP(2.15mm 1.94 mm 0.625 mm) Applications Products that use 1-cell lithium batteries for the power supply 20-pin plastic WL-CSP RF power amplifier Cell-phone RF-PC card, PDA Cypress Semiconductor Corporation 198 Champion Court San Jose, CA 95134-1709 408-943-2600 Document Number: 002-08963 Rev. *A Revised March 15, 2016 MB39C326 Pin Assignments Block Diagram Document Number: 002-08963 Rev. *A Page 2 of 4