MB39A136 2ch PFM/PWM DC/DC Converter IC with Synchronous Rectification MB39A136 is 2ch step-down DC/DC converter IC of the current mode N-ch/N-ch synchronous rectification method. It contains the enhanced protection features, and supports the symmetrical-phase method and the ceramic capacitor. MB39A136 realizes rapid response, high efficiency, and low ripple voltage, and its high-frequency operation enables the miniaturization of inductors and I/O capacitors. Features High efficiency For frequency setting by external resistor : 100 kHz to 1 MHz Error Amp threshold voltage : 0.7 V 1.0 Minimum output voltage value : 0.7 V Wide range of power-supply voltage : 4.5 V to 25 V PFM/PWM auto switching mode and fixed PWM mode selectable Supports Symmetrical-Phase method With built-in over voltage protection function With built-in under voltage protection function With built-in over current protection function With built-in over-temperature protection function With built-in soft start/stop circuit without load dependence With built-in synchronous rectification type output steps for N-ch MOS FET Standby current : 0 A Typ Small package : TSSOP-24 Application Digital TV Photocopiers Surveillance cameras Set-top boxes (STB) DVD players, DVD recorders Projectors IP phones Vending machine Consoles and other non-portable devices Cypress Semiconductor Corporation 198 Champion Court San Jose, CA 95134-1709 408-943-2600 Document Number: 002-08376 Rev. *A Revised February 22, 2016 MB39A136 Contents Pin Assignment ................................................................3 Application Note ............................................................. 24 Pin Description ................................................................. 4 Reference Data ............................................................... 41 Block Diagram ..................................................................5 Usage Precaution ........................................................... 43 Absolute Maximum Ratings ............................................6 Ordering Information ...................................................... 44 Recommended Operating Conditions ............................7 EV Board Ordering Information ................................. 44 Electrical Characteristics .................................................8 RoHS Compliance Information Of Typical Characteristics ..................................................12 Lead (Pb) Free Version .................................................. 45 Function Description ......................................................14 Marking Format (Lead Free version) ......................... 45 Current Mode ............................................................14 Labeling Sample (Lead free version) ....................... 46 Protection Function Table .............................................18 MB39A136PFT Recommended Conditions I/O Pin Equivalent Circuit Diagram ...............................19 Of Moisture Sensitivity Level ........................................ 47 Example Application Circuit ..........................................21 Package Dimensions ...................................................... 48 Parts List .........................................................................22 Major Changes ................................................................ 49 Document Number: 002-08376 Rev. *A Page 2 of 50