Datasheet 4.75V to 18V, 2A/3A/4A 1ch Buck Converter with Int egrated FET BD9325FJ BD9326EFJ BD9327EFJ General Description Key Specifications The BD9325FJ, BD9326EFJ and BD9327EFJ are Input Voltage Range: 4.75V to 18V step-down regulators with built-in low resistance high Output Current side N-Channel MOSFET. These ICs can supply BD9327EFJ : 4.0A (Max) continuous output current of 2A / 3A / 4A BD9326EFJ: 3.0A (Max) respectively over a wide input range, and provides BD9325FJ: 2.0A (Max) not only fast transient response, but also easy phase Switching Frequency: 380kHz (Typ) compensation because of current mode control. High Side FET ON-Resistance BD9327EFJ: 0.11(Typ) BD9326EFJ: 0.12(Typ) Features BD9325FJ: 0.16(Typ) Low ESR Output Ceramic Capacitors are Available Low Side FET ON-Resistance: 10(Typ) Low Standby Current during Shutdown Mode Standby Current: 80A (Typ) Feedback Voltage Operating Temperature Range: -40C to +85C 0.9V 1.5%(Ta=25C) 0.9V 3.0%(Ta=-25C to +85C) Packages W(Typ) D(Typ) H(Max) Protection Circuit: Under Voltage Protection Thermal Shutdown Over-Current Protection Applications Distributed Power System Pre-Regulator for Linear Regulator HTSOP-J8 4.90mm x 6.00mm x 1.00mm SOP-J8 4.90mm x 6.00mm x 1.65mm Typical Application Circuit C PC1 3300pF R DW R PC 10k C SS 15k 0.1F R UP 27k Thermal Pad (For BD9326EFJ, BD9327EFJ) L VIN=12V VOUT = 3.3V 10H C VC1 D C CO1 10F 20F Figure 1. Typical Application Circuit Product structure : Silicon monolithic integrated circuit This product has no designed protection against radioactive rays . www.rohm.com TSZ02201-0323AAJ00030-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/19 TSZ22111 14 001 05.Sep.2014 Rev.002 BST SS C BS VIN EN 0.1F SW COMP GND FB BD9325FJ BD9326EFJ BD9327EFJ Pin Configuration Block Diagram VIN (TOP VIEW) 1 BST SS 8 2 VIN EN 7 3 SW COMP 6 4 GND FB 5 Figure 2. Pin Configuration Figure 3. Block Diagram Pin Description Pin No. Pin Name Function 1 BST High-side gate drive boost input 2 VIN Power supply input terminal 3 SW Power switching output 4 GND Ground terminal 5 FB Feedback input 6 COMP Compensation node 7 EN Enable input 8 SS Soft start control input Lineup High Side FET Output Current Orderable ON-Resistance Package (Max) Part Number (Typ) 0.16 2.0 A SOP-J8 Reel of 2500 BD9325FJ-E2 0.12 3.0 A HTSOP-J8 Reel of 2500 BD9326EFJ-E2 0.11 4.0 A HTSOP-J8 Reel of 2500 BD9327EFJ-E2 www.rohm.com TSZ02201-0323AAJ00030-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/19 05.Sep.2014 Rev.002 TSZ22111 15001