The RT8086B is a high efficiency, synchronous step-down DC/DC converter. The available input voltage range is from 2.8V to 5.5V and the regulated output voltage is adjustable from 0.6V to 3.3V while delivering up to 3.5A of output current.Product Feature. The internal synchronous low on-resistance power switches increase efficiency and eliminate the need for an external Schottky diode. The current mode constant on-time operation with internal compensation allows the transient response to be optimized over a wide range of loads and output capacitors. The RT8086B is available in the UQFN-12L 2x2 (FC) package.
【Key Performance Summary Table】
Evaluation Board Number : PCB064_V1
Default Input Voltage
Max Output Current
Default Output Voltage
Default Marking & Package Type
RT8086BGQUF, UQFN-12L 2x2 (FC)
1.2MHz Switching Frequency
•High Efficiency Up to 95%
•Low RDS(ON) Switches : 50mΩ/40mΩ
•0.6V Reference Allows for Low Output Voltage
•Input Voltage Range : 2.8V to 5.5V
•Adjustable Output Voltage from 0.6V to 3.3V
•1.2MHz Switching Frequency
•Start-Up into Pre-Biased Load
•Built in Soft-Start
•Power Good Indication
•Cycle-by-Cycle Current Limit
•Input Under Voltage Lockout
•Output Under Voltage Protection (Hiccup)
•Thermal Shutdown Protection
•RoHS Compliant and Halogen Free
Comment (expected waveforms or voltage levels on test points)
Power Input. The available input voltage range is from 2.8V to 5.5V. A 10µF or larger input capacitor is needed to reduce voltage spikes at the input.
No Internal Connection
No Internal Connection.
Sense Input Pin for Output Voltage.
Feedback Input Voltage
Feedback Input. This pin used to set the output voltage of the converter to regulate to the desired value via an external resistive divider. The feedback reference voltage is 0.6V typically.
Switch Node test pin
Switch Node. Output of the internal high side and low side MOSFETs.
Enable test point
Enable Control Input. A logic-high (1.2V < EN < 5.5V) enables the converter; a logic-low forces the IC into shutdown mode.
PGOOD test point
Power Good Indicator. The output of this pin is an open drain with internal pull-up resister to VIN. The output of this pin is pulled to high when the FB voltage is within 10%; otherwise it is Low.
Supply Voltage for Internal Control Circuit. It is connected to PVIN inside the chip.
1. Apply a 3.3V nominal input power supply (2.8V to 5.5V) to the VIN and GND terminals
2. Connect an external load up to 3.5A to the VOUT and GND terminals and verify the output voltage and current.
Set the output voltage with the resistive divider (R1, R2) between External Input and GND with the midpoint connected to VREFIN. The output is set by the following formula :
0603 200K 1%
0603 100K 1%
UQFN-12L 2x2 (FC)
Z1, Z2, Z3, Z4
Top View (1st layer)
PCB Layout—Inner Side (2nd Layer)
PCB Layout—Inner Side (3rd Layer)
Bottom View (4th Layer)