Datasheet 2.5V to 4.5V, 0.6A 1ch Synchronous Buck Converter with Integrated FET BD9161FVM General Description Key Specifications The BD9161FVM is ROHMs high efficiency step-down Input Voltage Range: 2.5V to 4.5V switching regulator designed to produce a voltage as Output Voltage Range: 1.0V to 3.3V low as 1.2V from a supply voltage of 3.3V. It offers high Output Current: 0.6A(Max) efficiency by using pulse skip control technology and Switching Frequency: 1MHz(Typ) synchronous switches and provides fast transient Pch FET ON-Resistance: 0.35(Typ) response to sudden load changes by implementing Nch FET ON-Resistance: 0.37(Typ) current mode control. Standby Current: 0A (Typ) Operating Temperature Range: -25C to +85C Features Fast Transient Response because of Current Mode Package W(Typ) x D(Typ) x H(Max) Control System. High Efficiency for All Load Ranges because of Synchronous Switches (Nch/Pch FET) 100% Duty Function. Soft-Start Function. Thermal Shutdown and ULVO Functions. Short-Circuit Protection with Time Delay Function. Shutdown Function. Applications Power Supply for LSI including HDD, DVD, CPU and ASIC MSOP8 2.90 mm x 4.00 mm x 0.90 mm Typical Application Circuit CIN L VCC VCC,PVCC EN SW VOUT ADJ R 2 C O ITH GND,PGND RITH R1 C ITH Figure 1. Typical Application Circuit Product structure Silicon monolithic integrated circuit This product has no designed protection against radioactive rays. www.rohm.com TSZ02201-0J3J0AJ00190-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/21 06.Oct.2014 Rev.002 TSZ22111 14 001 Datasheet BD9161FVM Pin Configuration (TOP VIEW) VCC PVCC Figure 2. Pin Configuration Pin Description Pin No. Pin Name Pin Function 1 ADJ Output voltage detection pin 2 ITH GmAmp output pin/connected to phase compensation capacitor 3 EN Enable pin (active high) 4 GND Ground pin 5 PGND Power switch ground pin 6 SW Power switch node 7 PVCC Power switch supply pin 8 VCC Power supply input pin Block Diagram VCC EN 3 VCC 8 VREF 3.3V 7 Input PVCC Current Comp. Current R Q Sense/ Protect Gm Amp S Output SLOPE CLK + 6 OSC VCC SW Driver UVLO Logic PGND Soft Start 5 TSD 4 SCP GND 1 2 ADJ ITH Figure 3. Block Diagram www.rohm.com TSZ02201-0J3J0AJ00190-1-2 2012, ROHM Co., Ltd. All rights reserved. 2/21 06.Oct.2014 Rev.002 TSZ22111 15 001