RT8086BGQUF Richtek

RT8086B 3.5A, 1.2MHz, Synchronous Step-Down Converter General Description Features High Efficiency Up to 95% The RT8086B is a high efficiency, synchronous step-down Low R Switches : 50m/40m DS(ON) DC/DC converter. The available input voltage range is from 0.6V Reference Allows for Low Output Voltage 2.8V to 5.5V and the regulated output voltage is adjustable Internal Compensation from 0.6V to 3.3V while delivering up to 3.5A of output Input Voltage Range : 2.8V to 5.5V current. Adjustable Output Voltage from 0.6V to 3.3V The internal synchronous low on-resistance power 1.2MHz Switching Frequency switches increase efficiency and eliminate the need for Start-Up into Pre-Biased Load an external Schottky diode. Built in Soft-Start The current mode constant on-time operation with internal Power Good Indication compensation allows the transient response to be Cycle-by-Cycle Current Limit optimized over a wide range of loads and output capacitors. Input Under Voltage Lockout TheRT8086B is available in the UQFN-12L 2x2 (FC) Output Under Voltage Protection (Hiccup) package. Thermal Shutdown Protection RoHS Compliant and Halogen Free Ordering Information RT8086B Applications Smart Handheld devices Package Type QUF : UQFN-12L 2x2 (FC) (U-Type) Portable Instruments Lead Plating System Battery-Powered Equipment G : Green (Halogen Free and Pb Free) Distributed Power Systems Note : Richtek products are : Marking Information RoHS compliant and compatible with the current require- 0Y : Product Code ments of IPC/JEDEC J-STD-020. W : Date Code 0YW Suitable for use in SnPb or Pb-free soldering processes. Simplified Application Circuit RT8086B L PVIN LX V V IN OUT C IN VIN C OUT VOUT PGOOD PGOOD R1 FB EN Enable R2 PGND AGND Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS8086B-02 February 2016 www.richtek.com 1RT8086B Pin Configurations (TOP VIEW) VIN 10 1 9 PVIN PGOOD LX 2 11 8 LX EN 3 7 PGND 12 FB PGND 4 6 AGND VOUT 5 NC UQFN-12L 2x2 (FC) Functional Pin Description Pin No. Pin Name Pin Function Power Input. The available input voltage range is from 2.8V to 5.5V. A 10 F or 1 PVIN larger input capacitor is needed to reduce voltage spikes at the input. 2, 11 LX Switch Node. Output of the internal high side and low side MOSFETs. 3, 12 PGND Power Ground. 4 AGND Analog Ground. 5 NC No Internal Connection. 6 VOUT Sense Input Pin for Output Voltage. Feedback Input. This pin used to set the output voltage of the converter to 7 FB regulate to the desired value via an external resistive divider. The feedback reference voltage is 0.6V typically. Enable Control Input. A logic-high (1.2V < EN < 5.5V) enables the converter a 8 EN logic-low forces the IC into shutdown mode. Power Good Indicator. The output of this pin is an open drain with internal pull-up 9 PGOOD resister to VIN. The output of this pin is pulled to high when the FB voltage is within 10% otherwise it is Low. 10 VIN Supply Voltage for Internal Control Circuit. It is connected to PVIN inside the chip. Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS8086B-02 February 2016 2