VOUT SW FB SW GND SW VREG PGND TEST PGND VIN PGND Datasheet 7.5V to 18V, 6A Integrated MOSFET 1ch Synchronous Buck DC/DC Converter BD95861MUV Description Features BD95861MUV is a 1ch synchronous buck converter that Input Voltage Range: 7.5V to 18.0V can generate output voltage (0.8V to 5.5V) at the input Reference Voltage 0.8V 1.5% voltage range (7.5V to 18V). Space-saving and high Output Voltage Range: 0.8V to 5.5V efficient switching regulator can be achieved due to Output Curre nt: 6.0A (Max.) built-in N-MOSFET power transistors. The IC also Switching Frequency: 350kHz to 800kHz 3 TM incorporates H Reg technology, a Rohm proprietary depend on input-output condition constant ON TIME control mode which facilitates Built-in Power MOS FET ultra-high transient response against changes in load without external compensation components. Fixed soft High-side Nch FET ON resistance: 50m (typ.) start function, power good function, and short circuit / Low-side Nch FET ON resistance: 30m (typ.) over voltage protection with timer latch functions are 3 Fast Transient Responses due to H Reg control incorporated. The BD95861MUV is designed for power Over Current Protection (OCP) Cycle-by-Cycle supplies for Digital AV Equipment. T hermal Shut Down (TSD) Under-V oltage Lock-Out (UVLO) Applications Short Circuit Protection (SCP) LCD T Vs Over Voltage Protection (OVP) Set Top Boxes (STB) Fix ed Soft Start (1msec typ) DVD/Blu-ray players/recorders Po wer Good function Broad band Network and Communication Interface Amuseme nt, other. Package W(Typ.) x D(Typ.) x H(Max.) VQFN024V4040 4.0mm x 4.0mm x 1.0mm Pin Configuration (TOP VIEW) Typical Application 24 23 22 21 20 19 VIN 1 18 PGOOD VIN 2 17 EN VIN 3 16 BOOT VIN 4 15 SW PGND 5 14 SW 6 PGND 13 SW 7 8 9 10 11 12 Figure.1 Typical Application Circuit Figure.2 Pin Configuration Product structure Silicon monolithic integrated circuit This product is not designed protection against radioactive rays. www .rohm.com TSZ02201-0F3F0AC00130-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/23 10.Aug.2017 Rev.005 TSZ22111 14 001 DatasheetDatasheet BD95861MUV Block Diagram VIN VREG 24 22 VIN VREG 1 Thermal TSD Protection 5V 4 5VReg VOUT BOOT 19 16 SCP BG EN/UVLO BG TSD/SCP SW 10 VREG 15 EN Soft R Q 3 TM Driver UVLO H Reg SS Start Circuit TSD Controller Block S FB SW OCP 20 REF + SS + - OVP UVLO SCP PGOOD OCP 5 PGND SCP 18 TSD 9 Power Good EN BG 0.56V SCP + - EN FB 17 REF Delay Reference UVLO 0.96V Block + OVP - FB EN 21 23 GND TEST Figure.3 Block Diagram Pin Description No. Symbol Description Input Voltage Supply pin. The IC determines the duty cycles internally based on the input voltage. Therefore, variations of VIN pin can lead to unstable operation. This pin also acts as the input voltage to the internal switching regulator output 1-4, 24 VIN block, and is sensitive to the impedance of the power supply. Connect over 10uF ceramic capacitors for the decoupling capacitors to PGND as near as these pins. 5-9 PGND Power ground pin connected to the source of the Low side FET. Switch node connection between High side FET source and Low side FET drain. 10-15 SW Connect 0.1 F capacitor and 20 resistor between BOOT and SW. This pin is also connected to inductor (L). High side FET Gate Driver Power Supply pin. 16 BOOT Connect 0.1 F capacitor and 20 resistor between BOOT and SW. BOOT voltage swings from VREG to (VIN + VREG) during normal switching operation. Enable Input pin. 17 EN When the input voltage of the EN pin reaches at least 2.2V, the switching regulator becomes active. At the voltage less than 0.3 V, the IC becomes standby mode. Open-drain Power Good Output pin. 18 PGOOD Due to the open-drain output, a 100k pull-up resistor should be connected between this pin and VREG or other power supply. In the case of no use, this pin is opened or shortened to ground. www .rohm.com TSZ02201-0F3F0AC00130-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/23 10.Aug.2017 Rev.005 TSZ22111 15 001