BD9122GUL-E2 ROHM

Datasheet 2.5V to 5.5V , 0.3A 1ch Synchronous Buck Converter with Integrated FET BD9122GUL General Description Key Specifications The BD9122GUL is ROHMs high efficiency step-down Input Voltage Range: 2.5V to 5.5V switching regulator designed to produce a voltage as Output Voltage Range: 1.0V to 2.0V low as 1V from a supply voltage of 3.3V or 5V. It offers Output Current: 0.3A (Max) high efficiency by using pulse skip control technology Switching Frequency: 1MHz(Typ) and synchronous switches, and provides faster Pch FET ON Resistance: 0.3(Typ) transient response to sudden load changes by Nch FET ON Resistance: 0.2(Typ) implementing 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. VCSP50L2: 2.50mm x 1.10mm x 0.55mm High Efficiency for All Load Ranges because of Synchronous Rectifier (Nch and Pch FET) and TM SLLM (Simple Light Load Mode). Soft-Start Function. Thermal Shutdown and UVLO Functions Short-Circuit Protection with Time Delay Function Shutdown Function. Applications Power Supply for LSI including DSP, Microcomputer and ASIC Typical Application Circuit C L IN V CC VCC,PVCC EN SW V OUT ADJ R2 CO ITH GND,PGND RITH R 1 CITH Figure 1. Typical Application Circuit Product structure Silicon monolithic integrated circuit This product has no designed protection against radioactive rays . www.rohm.com TSZ02201-0J3J0AJ00110-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/21 TSZ22111 14 001 02.Oct.2014 Rev.002 BD9122GUL Pin Configuration TOP VIEW SW B1 A1 PGND PVCC B2 A2 GND VCC B3 A3 EN ADJ B4 A4 ITH Figure 2. Pin Configuration Pin Description Pin No. Pin Name Pin Function A1 PGND Power switch ground pin A2 GND Ground pin A3 EN Enable pinActive High A4 ITH Gm Amp output pin/connected phase compensation capacitor B1 SW Power switch node B2 PVCC Power switch supply pin B3 VCC VCC power supply input pin B4 ADJ Output voltage detect pin Block Diagram V CC EN VCC VR EF 3.3V PVCC Input Current Current 10F Sense/ Comp Protect R Q + + S Driver 4.7H Output SLOPE CLK Gm Amp Logic OSC + SW VCC 4.7F UVLO Soft Start TSD PGND SCP GND ADJ ITH CITH RITH R 2 R 1 Figure 3. Block Diagram www.rohm.com TSZ02201-0J3J0AJ00110-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/21 TSZ22111 15 001 02.Oct.2014 Rev.002