V IN RT8130B BOOT V OUT UGATE PHASE LGATE COMP/EN EN FB RT8130B 12V High Efficiency Synchronous Buck PWM Controller General Description Features High Light Load Efficiency The RT8130B is a high efficiency single phase Single 5V to 12V Driver Voltage synchronous Buck DC/DC controller with 5V/12V supply Integrated High Driving Capability N-MOSFET Gate voltage. Drivers The RT8130B has embedded MOSFET gate driver with 300kHz Fixed Frequency Internal Oscillator high driving capability, supporting driving voltage up to 12V 88% Maximum PWM Duty Cycle for high output current application. This device uses Power Good Indicator lossless low-side MOSFET R current sense DS(ON) Enable/Disable Control technique for over-current protection with adjustable Internal Soft-Start threshold set by the LGATE pin (LGOCS). Other features Lossless Low-Side MOSFET R Current Sensing DS(ON) include power good indication, enable/disable control and for Over-Current Fault Monitoring internal soft-start. The RT8130B also provides fault LGATE Over-Current Setting (LGOCS) protection functions to protect the power stage output. OCP, UVP, OVP, OTP, UVLO With above functions, the IC provides customers a cost- effective solution for high efficiency power conversion. The Ordering Information RT8130B is available in the WDFN-10L 3x3 package. RT8130B Package Type QW : WDFN-10L 3x3 (W-Type) Applications Lead Plating System Motherboard, Memory/Chip-set Power G : Green (Halogen Free and Pb Free) Graphic Card, GPU/Memory Core Power Note : Low Voltage, High Current DC/DC Regulator Richtek products are : RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. Simplified Application Circuit Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS8130B-02 January 2016 www.richtek.com 1 V VCC CC V PGOOD PGOOD GNDRT8130B Pin Configurations Marking Information (TOP VIEW) 8X= : Product Code YMDNN : Date Code 8X=YM 10 BOOT 1 PGOOD 2 9 PHASE NC DNN 3 8 UGATE FB 4 7 LGATE COMP/EN 11 5 6 GND VCC WDFN-10L 3x3 Functional Pin Description Pin No. Pin Name Pin Function Bootstrap Supply for High-Side Gate Driver. Connect this pin to a power source VCC through a bootstrap diode, and connect a 0.1F or greater ceramic 1 BOOT capacitor from this pin to the PHASE pin to supply the power for high-side gate driver. Switch Node. Connect this pin to the switching node of Buck converter. This pin 2 PHASE is also the floating drive return of the high-side MOSFET gate driver. High-Side MOSFET Gate Driver Output. Connect this pin to the Gate of high- 3 UGATE side MOSFET for floating drive. Low-Side MOSFET Gate Driver Output. Connect this pin to the Gate of low-side MOSFET. This pin is also used for Over-Current Protection (OCP) threshold 4 LGATE setting. Connect a resistor (R ) from this pin to the GND pin to set the OCP OCSET threshold. 5, Ground. The exposed pad must be soldered to a large PCB and connected to GND 11 (Exposed Pad) GND for maximum power dissipation. Supply Voltage Input. It is recommended to connect a 1F or greater ceramic 6 VCC capacitor from this pin to the GND pin. VCC also powers the low-side gate driver. Compensation Node. Connect R-C network between this pin and the FB pin for 7 COMP/EN PWM control loop compensation. This pin is also used for enable/disable control. Connect a small signal MOSFET to this pin to implement enable/disable control. Feedback Voltage Input. This pin is used for output voltage feedback input and it is also monitored for power good indication, over-voltage and under-voltage 8 FB protections. Connect this pin to the converter output through voltage divider resistors for output voltage regulation. 9 NC No Internal Connection. Power Good Indicator Output. This pin provides an open-drain output. Connect this pin to a voltage source through a pull-up resistor. The PGOOD voltage goes 10 PGOOD high to indicate the output voltage is in regulation. This pin can be left open if the power good indication function is not used. Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS8130B-02 January 2016 www.richtek.com 2 GND