Datasheet 2.7V to 5.5V Input, 3.0A Integrated MOSFET Single Synchronous Buck DC/DC Converter BD9B300MUV General Description Key Specifications BD9B300MUV is a synchronous buck switching Input Voltage Range: 2.7V to 5.5V regulator with built-in low on-resistance power MOSFETs. Output Voltage Range: 0.8 V to VPVIN x 0.8 V This IC, which is capable of providing current up to 3A, Maximum Operating Current: 3A (Max) features fast transient response by employing constant Switching Frequency: 2MHz/1MHz (Typ) on-time control system. It offers high oscillating High-Side MOSFET ON Resistance: 35m (Typ) frequency at low inductance. With its original constant Low-Side MOSFET ON Resistance: 35m (Typ) on-time control method which operates low consumption Standby Current: 0A (Typ) at light load, this product is ideal for equipment and devices that demand minimal standby power Package W (Typ) x D (Typ) x H (Max) consumption. VQFN016V3030 3.00 mm x 3.00 mm x 1.00 mm Features Synchronous Single DC/DC Converter Constant on-time control suitable to Deep-SLLM Over Current Protection Short Circuit Protection Thermal Shutdown Protection Under Voltage Lockout Protection Adjustable Soft Start Power Good Output VQFN016V3030 Package (backside heat dissipation) Applications VQFN016V3030 Step-down Power Supply for DSPs, FPGAs, Microprocessors, etc. Laptop PCs/Tablet PCs/Servers LCD TVs Storage Devices (HDDs/SSDs) Printers, OA Equipment Entertainment Devices Distributed Power Supply, Secondary Power Supply Typical Application Circuit PGD VIN PVIN PGD AVIN BOOT Enable EN CBOOT 10F 0.1F VOUT SW AGND 1.0H PGND R1 SS CFB 22F2 MODE CSS FB FREQ R2 Figure 1. Application Circuit Product structure : Silicon monolithic integrated circuit This product has no designed protection against radioactive rays . www.rohm.com TSZ02201-0J2J0AJ00410-1-2 2014 ROHM Co., Ltd. All rights reserved. 1/30 TSZ22111 14 001 23.May.2014 Rev.001DatasheetDatasheet BD9B300MUV Pin Configuration (TOP VIEW) Figure 2. Pin Assignment Pin Descriptions Pin No. Pin Name Function Power supply terminals for the switching regulator. 1, 2 PVIN These terminals supply power to the output stage of the switching regulator. Connecting a 10F ceramic capacitor is recommended. 3, 4 PGND Ground terminals for the output stage of the switching regulator. 5 AGND Ground terminal for the control circuit. An inverting input node for the error amplifier and main comparator. 6 FB See page 22 for how to calculate the resistance of the output voltage setting. Terminal for setting switching frequency. Connecting this terminal to ground makes switching to operate constant on-time corresponding to 2.0MHz. Connecting this 7 FREQ terminal to AVIN makes switching to operate constant on-time corresponding to 1.0MHz. This terminal needs to be terminated. Terminal for setting switching control mode. Connecting this terminal to AVIN forces the device to operate in the fixed frequency PWM mode. Connecting this terminal to 8 MODE ground enables the Deep-SLLM control and the mode is automatically switched between the Deep-SLLM control and fixed frequency PWM mode. Terminal for setting the soft start time. The rise time of the output voltage can be 9 SS specified by connecting a capacitor to this terminal. See page 23 for how to calculate the capacitance. Switch nodes. These terminals are connected to the source of the High-Side MOSFET and drain of the Low-Side MOSFET. Connect a bootstrap capacitor of 0.1 10, 11, 12 SW F between these terminals and BOOT terminal. In addition, connect an inductor of 0.47H to 1H (FREQ=L), 1H to 1.5H (FREQ=H) considering the direct current superimposition characteristic. Terminal for bootstrap. Connect a bootstrap capacitor of 0.1 F between this terminal 13 BOOT and SW terminals. The voltage of this capacitor is the gate drive voltage of the High-Side MOSFET. A Power Good terminal, an open drain output. Use of pull up resistor is needed. See 14 PGD page 17 for how to specify the resistance. When the FB terminal voltage reaches more than 80% of 0.8 V, the internal Nch MOSFET turns off and the output turns High. Enable terminal. Turning this terminal signal Low (0.3V or lower) forces the device to 15 EN enter the shutdown mode. Turning this terminal signal High (2.0V or higher) enables the device. This terminal must be terminated. Terminal for supplying power to the control circuit of the switching regulator. 16 AVIN Connecting a 0.1F ceramic capacitor is recommended. A backside heat dissipation exposed pad. Connecting to the internal PCB ground - E-Pad plane by using multiple vias provides excellent heat dissipation characteristics. www.rohm.com TSZ02201-0J2J0AJ00410-1-2 2014 ROHM Co., Ltd. All rights reserved. 2/30 TSZ22111 15 001 23.May.2014 Rev.001 AGND AVIN FB EN FREQ PGD MODE BOOT