Datasheet 3. 5V to 14V, 1.0A 1ch Synchronous Buck Converter Integrated MOSFET BD8313HFN General Description Key Specifications Input Voltage Range: +3.5V to +14V The BD8313HFN can produce stepped-down voltage Output Voltage Range: +1.2V to +12V from a power supply composed of 4 batteries, which Output Current: 1.0A(Max) can be Li2cell, Li3cell, etc., or from a 5V/12V fixed Switching Frequency: 1.0MHz(Typ) power supply line. Output voltages include 1.2V, 1.8V, Pch FET ON-Resistance: 450m(Typ) 3.3V, or 5.0V. This IC allows easy production of a Nch FET ON-Resistance: 300m(Typ) compact power supply since its high operating Standby Current: 0A(Typ) frequency of 1.0MHz requires small-sized external Operating Temperature Range: -25C to +85C inductor and capacitor and the phase compensation components are integrated in the chip. The built-in Package W(Typ) x D(Typ) x H(Max) synchronous rectification switches are capable of withstanding 15V. Features Built-In Pch/Nch Synchronous Rectification SW Capable of Withstanding 1.2 A/15V. Built-In Phase Compensation Device between Input and Output of Error AMP. Built-In Soft-Start Function. Built-In Short-Circuit Protection with Timer HSON8 2.90mm x 3.00mm x 0.60mm Application For Portable Equipments like DSC/DVC Powered by 4 Dry Batteries or Li2cell and Li3cell, or General Consumer-Equipment with 5V/12V Lines Typical Application Circuit VB AT=4.510V VBAT=4.5V to 10V 10 F 10 F GND INV GRM31CBE106KA75L Murat a ON/OFF STB VCC 10pF 1 F 1 F GRM188B11A105KA61 PVCC VREG Murat a 68k 200k 3.3V/500mA 68k 200k PGND LxLX 1 F 4.7 H 1 F 4.7 H 5151kk GRM188B11A105KA61 1127AS4R7MTO KO 10 F 22k 10 F 22k Murat a GRM31CB11A106KA01 Murat a Figure 1. Typical Application Circuit Product structureSilicon monolithic integrated circuit This product has no designed protection against radioactive rays .w ww.rohm.com TSZ02201-0Q3Q0NZ00370-1-2 2014 ROHM Co., Ltd. All rights reserved. 1/27 TSZ2211114001 17.Feb.2015 Rev.002 BD8313HFN Pin Configuration (TOP VIEW) GND INV STB VCC PVCC VREG LX PGND Lx Figure 2. Pin Configuration Pin Description Pin No. Pin Name Function 1 GND Ground pin 2 VCC Control circuit power supply pin 3 VREG 5V output pin of regulator for internal circuit 4 PGND Power transistor ground pin 5 LX Switching output pin (pin for external coil) 6 PVCC Power transistor supply pin 7 STB ON/OFF pin 8 INV Error AMP input pin Block Diagram Figure 3. Block Diagram www.rohm.com TSZ02201-0Q3Q0NZ00370-1-2 2014 ROHM Co., Ltd. All rights reserved. 2/27 TSZ2211115001 17.Feb.2015 Rev.002