RT6210 500mA, 80V, 350kHz Synchronous Step-Down Converter General Description Features 0.8V Feedback Reference Voltage with 1.5% The RT6210 is a 80V, 500mA, 350kHz, high-efficiency, Accuracy synchronous step-down DC-DC converter with an input- Wide Input Voltage Range : 5.2V to 80V voltage range of 5.2V to 80V and a programmable output- Output Current : 500mA voltage range of 0.8V to 72V. It features current-mode Integrated N-MOSFETs control to simplify external compensation and to optimize Current-Mode Control transient response with a wide range of inductors and output Fixed Switching Frequency : 350kHz capacitors. High efficiency can be achieved through Programmable Output Voltage : 0.8V to 72V integrated N-MOSFETs, and pulse-skipping mode at light Low < 3A Shutdown Quiescent Current loads. With EN pin, power-up sequence can be more Up to 92% Efficiency flexible and shutdown quiescent current can be reduced Pulse-Skipping Mode for Light-Load Efficiency to < 3A. Programmable Soft-Start Time The RT6210 features cycle-by-cycle current limit for over- Cycle-by-Cycle Current Limit Protection current protection against short-circuit outputs, and user- Input Under-Voltage Lockout, Output Under-Voltage programmable soft-start time to prevent inrush current and Thermal Shutdown Protection during startup. It also includes input under-voltage lockout, output under-voltage, and thermal shutdown protection to Applications provide safe and smooth operation in all operating 4-20mA Loop-Powered Sensors conditions. OBD-II Port Power Supplies The RT6210 is available in the SOP-8 (Exposed pad) Low-Power Standby or Bias Voltage Supplies package. Industrial Process Control, Metering, and Security Systems High-Voltage LDO Replacement Telecommunications Systems Commercial Vehicle Power Supplies General Purpose Wide Input Voltage Regulation Simplified Application Circuit Efficiency vs. Output Current 100 90 C BOOT 80 70 V VIN BOOT IN L1 V = 24V IN 60 C IN V SW OUT V = 36V IN RT6210 50 R1 V = 48V IN Enable EN FB V = 60V 40 IN SS GND C COMP FF V = 80V IN 30 C C C OUT R2 20 C C P SS R C 10 V = 12V OUT 0 0 0.1 0.2 0.3 0.4 0.5 Output Current (A) Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS6210-00 May 2017 www.richtek.com 1 Efficiency (%)RT6210 Ordering Information Marking Information RT6210GSP : Product Number RT6210 RT6210 YMDNN : Date Code Package Type GSPYMDNN SP : SOP-8 (Exposed Pad-Option 2) Lead Plating System G : Green (Halogen Free and Pb Free) Pin Configuration Note : (TOP VIEW) Richtek products are : RoHS compliant and compatible with the current require- 8 SS BOOT ments of IPC/JEDEC J-STD-020. 2 7 VIN EN GND 3 6 Suitable for use in SnPb or Pb-free soldering processes. SW COMP 9 4 5 GND FB SOP-8 (Exposed Pad) Functional Pin Description Pin No. Pin Name Pin Function Bootstrap capacitor connection node for high-side gate driver. Connect a 0.1F 1 BOOT ceramic capacitor from BOOT to SW to power the internal gate driver. Supply voltage input, 5.2V to 80V. Bypass VIN to GND with a large high-quality 2 VIN capacitor. 3 SW Switch node for output inductor connection. Power ground. The exposed pad must be connected to GND and well soldered 4, 9 GND to the input and output capacitors and a large PCB copper area for maximum (Exposed Pad) power dissipation. Feedback voltage input. Connect FB to the midpoint of the external feedback 5 FB resistor divider to sense the output voltage. The device regulates the FB voltage at 0.8V (typical) Feedback Reference Voltage. Compensation node for the compensation of the regulation control loop. 6 COMP Connect a series RC network from COMP to GND. In some cases, another capacitor from COMP to GND may be required. Enable control input. A logic High (V > 1.35V) enables the device, and a logic EN Low (V < 0.925V) shuts down the device, reducing the supply current to 3A EN 7 EN or below. Connect EN pin to VIN pin with a 100k pull-up resistor for automatic startup. Soft-start capacitor connection node. Connect an external capacitor from SS to GND to set the soft-start time. Do not leave SS pin unconnected. A capacitor of 8 SS capacitance from 10nF to 100nF is recommended, which can set the soft-start time from 1.33ms to 13.3ms, accordingly. Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS6210-00 May 2017 2