RT8062GSP

® RT8062 2A, 2MHz, Synchronous Step-Down Converter General Description Features The RT8062 is a simple, easy-to-use current mode controlled 2A synchronous step-down DC-DC converter with an input supply voltage range from 2.7V to 5.5V. The device build-in an accurate 0.8V reference voltage and integrates low RDS(ON) power MOSFETs to achieve high  efficiency in a SOP-8 (Exposed Pad) package.  The RT8062 operates in automatic PSM that maintains high efficiency during light load operation. The device features cycle-by-cycle current-limit protection to prevent the device from the catastrophic damage in output short circuit, over-current or inductor saturation. Built-in softstart function prevents inrush current during start-up. The device also features input under-voltage lockout, output under-voltage protection, and over-temperature protection to provide safe and smooth operation in all operating conditions.           100% Duty Cycle for Lowest Dropout Power Saving Mode for Light Loads Adjustable Frequency : 200kHz to 2MHz 0.8V Reference Allows Low Output Voltage Enable Function Internal Soft-Start Input Under-Voltage Lockout Protection Output Under-Voltage Protection Over-Temperature Protection RoHS Compliant and Halogen Free Applications    Ordering Information  RT8062  Package Type SP : SOP-8 (Exposed Pad-Option 2) Input Voltage Range from 2.7V to 5.5V Ω FETs Integrated 180mΩ Ω and 120mΩ LCD TVs and Monitors Notebook Computers Distributed Power Systems IP Phones Digital Cameras Pin Configurations Lead Plating System G : Green (Halogen Free and Pb Free) COMP Note : Richtek products are :  RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.  (TOP VIEW) Suitable for use in SnPb or Pb-free soldering processes. 8 GND 2 EN 3 VIN 7 GND 6 9 4 5 FB RT LX LX SOP-8 (Exposed Pad) Marking Information RT8062GSP : Product Number RT8062 GSPYMDNN YMDNN : Date Code Copyright © 2020 Richtek Technology Corporation. All rights reserved. DS8062-08 November 2020 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT8062 Typical Application Circuit RT8062 VIN 2.7V to 5.5V 4 VIN CIN 10µF LX FB 3 EN RRT 7 RT COMP GND L 5, 6 VOUT R1 8 1 COUT RCOMP R2 2, 9 (Exposed Pad) CCOMP Note : Using all Ceramic Capacitors Table 1. Recommended Components Selection for fSW = 1MHz VOUT (V) R1 (k) R2 (k) RCOMP (k) CCOMP (pF) L (H) COUT (F) 3.3 75 24 33 560 2.0 22 2.5 51 24 22 560 2.0 22 1.8 30 24 15 560 1.5 22 1.5 21 24 13 560 1.5 22 1.2 12 24 11 560 1.5 22 1.0 6 24 8.2 560 1.5 22 Note: Considering the effective capacitance de-rated with biased voltage level and size, the COUT component needs satisfy the effective capacitance at least 15μF or above at targeted output level for stable and normal operation. Functional Pin Description Pin No. 1 Pin Name COMP 2, GND 9 (Exposed Pad) Pin Function Compensation node. Connect external compensation elements to this pin to stabilize the control loop. GND exposed pad. The exposed pad is internally connected with GND and must be soldered to a large GND plane. Connect this GND plane to other layers with thermal vias to help dissipate heat from the device. 3 EN Enable control input. Connect this pin to logic high enables the device and connect this pin to ground disables the device. 4 VIN Power input. Connect input capacitors between this pin and PGND. It is recommended to use a 10F, X5R, 0805 and a 0.1F, X5R capacitors. 5, 6 LX Switch node between the internal switch and the synchronous rectifier. Connect this pin to the inductor. 7 RT Oscillator Resistor Input. Connecting a resistor from this pin to GND sets the switching frequency. FB Feedback voltage input. Connect this pin to the midpoint of the external feedback resistive divider to set the output voltage of the converter to the desired regulation level. The device regulates the FB voltage at a feedback reference voltage, typically 0.8V. 8 Copyright © 2020 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS8062-08 November 2020 RT8062 Function Block Diagram RT SD VIN ISEN OSC Slope Com COMP 0.8V EA FB Output Clamp Driver Int-SS Hiccup 0.7V EN Enable 0.4V UV November 2020 LX Control Logic P-G Copyright © 2020 Richtek Technology Corporation. All rights reserved. DS8062-08 OC Limit NISEN OTP GND N-MOS ILIM is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT8062 Absolute Maximum Ratings          (Note 1) Supply Input Voltage, VIN ---------------------------------------------------------------------------------------------LX Pin Switch Voltage --------------------------------------------------------------------------------------------------