RT8064ZSP

® RT8064 2A, 2MHz, Synchronous Step-Down Converter General Description Features The RT8064 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 built-in an accurate 0.8V reference voltage and integrates low RDS(ON) power MOSFETs to achieve high  efficiency in both WDFN-8L 3x3 and SOP-8 (Exposed Pad) packages.  The RT8064 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. Adjustable 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.              Ordering Information  RT8064  Lead Plating System Z : ECO (Ecological Element with Halogen Free and Pb free) Note : 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 External Soft-Start Power Good Function Input Under-Voltage Lockout Protection Output Under-Voltage Protection Over-Temperature Protection RoHS Compliant and Halogen Free Applications  Package Type SP : SOP-8 (Exposed Pad-Option 2) QW : WDFN-8L 3x3 (W-Type) 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 Marking Information RT8064ZSP RT8064ZSP : Product Number RT8064 ZSPYMDNN YMDNN : Date Code Richtek products are :  RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.  Suitable for use in SnPb or Pb-free soldering processes. Copyright © 2020 Richtek Technology Corporation. All rights reserved. DS8064-08 December 2020 RT8064ZQW 28 : Product Code 28 YM DNN YMDNN : Date Code is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT8064 Pin Configuration (TOP VIEW) SS 2 EN 3 VIN 4 GND 9 8 PGOOD 7 FB 6 RT 5 COMP SS EN VIN LX SOP-8 (Exposed Pad) 8 1 3 GND COMP 6 4 9 5 2 7 PGOOD FB RT LX WDFN-8L 3x3 Typical Application Circuit VIN 2.7V to 5.5V 4 R3 100k RT8064 5 LX VIN L VOUT CIN 10µF R1 8 PGOOD PGOOD RRT 6 RT FB COMP GND Chip Enable 3 EN SS 7 1 COUT RCOMP R2 9 (Exposed Pad) CCOMP 2 CSS 10nF 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 22 2.5 51 24 22 560 2 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 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. Copyright © 2020 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS8064-08 December 2020 RT8064 Functional Pin Description Pin No. Pin Name Pin Function SOP-8 (Exposed Pad) WDFN-8L 3x3 1 1 COMP Compensation node. Connect external compensation elements to this pin to stabilize the control loop. 2 2 SS Soft-start capacitor connection node. Connect an external capacitor between this pin and ground to set the soft-start time. 3 3 EN Enable control input. Connect this pin to logic high enables the device and connect this pin to ground disables the device. 4 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 5 LX Switch node between the internal switch and the synchronous rectifier. Connect this pin to the inductor. 6 6 RT Oscillator Resistor Input. Connect a resistor from this pin to GND sets the switching frequency. 7 7 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 8 PGOOD Power Good Indicator. This pin is an open drain logic output that is pulled to ground when the output voltage is not within 12.5% of regulation point. 9 (Exposed Pad) 9 (Exposed Pad) GND Copyright © 2020 Richtek Technology Corporation. All rights reserved. DS8064-08 December 2020 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. is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT8064 Functional Block Diagram RT SD VIN ISEN Slope Com OSC COMP 0.8V FB OC Limit Output Clamp EA 10µA 0.7V EN Driver Hiccup SS Enable 0.4V LX Control Logic P-G NISEN OTP UV GND N-MOSFET ILIM PGOOD Copyright © 2020 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 is a registered trademark of Richtek Technology Corporation. DS8064-08 December 2020 RT8064 Absolute Maximum Ratings          (Note 1) Supply Input Voltage, VIN ---------------------------------------------------------------------------------------------LX Pin Switch Voltage --------------------------------------------------------------------------------------------------