Datasheet 7.5V to 15V, 2A Integrated MOSFET 1ch Synchronous Buck DC/DC Converter BD95821MUV Description Features BD95821MUV is a 1ch synchronous buck converter that Input Voltage Range: 7.5V to 15.0V can generate output voltage (0.8V to 5.5V) at the input Reference Voltage: 0.8V1.5% voltage range (7.5V to 15V). Space-saving and high Output Voltage Range: 0.8V to 5.5V efficient switching regulator can be achieved due to Output Current: 2.0A (Max.) built-in N-MOSFET power transistors. The IC also 3 TM Switching Frequency: 500kHz to 800kHz 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: 120m(typ.) start function, power good function, and short circuit / Low-side Nch FET ON resistance: 65m(typ.) 3 over voltage protection with timer latch functions are Fast Transient Responses due to H Reg control incorporated. The BD95821MUV is designed for power Over Current Protection (OCP) Cycle-by-Cycle supplies for Digital AV Equipment. Thermal Shut Down (TSD) Under-Voltage Lock-Out (UVLO) Applications Short Circuit Protection (SCP) LCD TVs Over Voltage Protection (OVP) Set Top Boxes (STB) Fixed Soft Start (1msec typ) DVD/Blu-ray players/recorders Power Good function Broadband Network and Communication Interface Amusement, other. Package W(Typ.) x D(Typ.) x H(Max.) VQFN016V3030 3.0mm x 3.0mm x 1.0mm Pin Configuration (TOP VIEW) Typical Application PGOOD EN 12 10 9 11 GND BOOT 8 13 12 11 10 9 SW VREG 7 14 GND BOOT 13 8 SW GND TEST 15 6 VREG SW 14 7 Thermal Pad GND TEST SW 15 6 SW 5 VIN 16 GND VIN SW VIN 16 5 VOUT 1 2 3 4 1 234 Figure 1. Typical Application Circuit Figure 2 .Pin Configuration Product structureSilicon monolithic integrated circuit This product is not designed protection against radioactive rays. www.rohm.com TSZ02201-0333AAC00110-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/23 18.Mar.2013 Rev.003 TSZ2211114001 VIN FB VOUT VIN PGND PGOOD PGND EN VIN FB VIN VOUT PGND PGOOD PGND EN DatasheetDatasheet BD95821MUV Block Diagram 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 1, 2, 16 VIN switching regulator output block, and is sensitive to the impedance of the power supply. Connect over 10F ceramic capacitors for the decoupling capacitors to PGND as near as these pins. 3, 4 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. 5, 6, 7 SW Connect 0.01F capacitor between BOOT and SW. This pin is also connected to inductor (L). High side FET Gate Driver Power Supply pin. 8 BOOT Connect 0.01F capacitor between BOOT and SW. BOOT voltage swings from VREG to (VIN + VREG) during normal switching operation. Enable Input pin. 9 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. 10 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 TSZ02201-0333AAC00110-1-2 2013 ROHM Co., Ltd. All rights reserved. 2/23 18.Mar.2013 Rev.003 TSZ2211115001