RT6208GE Evaluation Board your power partner. High Efficiency, 36V 100mA Synchronous Step-Down Converter Purpose The RT6208 is a high voltage Buck converter that can deliver up to 100mA output current from a wide input voltage range of 4.5V to 36V. This document explains the function and use of the RT6208 evaluation board (EVB) and provides information to enable operation and modification of the evaluation board and circuit to suit individual requirements. Table of Contents Purpose ................................................................................................................................................................. 1 Introduction............................................................................................................................................................ 2 Key Performance Summary Table .......................................................................................................................... 2 Bench Test Setup Conditions ................................................................................................................................. 3 Schematic, Bill of Materials & Board Layout ........................................................................................................... 4 More Information.................................................................................................................................................... 6 Important Notice for Richtek Reference Designs .................................................................................................... 6 EVB_RT6208GE-00 November 2015 1 http://www.richtek.com RT6208GE Evaluation Board your power partner. Introduction General Product Information The RT6208 is a high-efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 100mA output current from a 4.5V to 36V input supply. It requires only 25µA typical supply current at no load while maintaining output voltage regulation. The RT6208 achieves Boundary Conduction Mode (BCM) operation, low quiescent current and programmable high-side peak current limit, providing high efficiency over a wide range of load currents. It also provides soft-start protection to eliminate input current surge during start-up. The low current (3µA) shutdown mode provides output disconnect, enabling easy power management in battery-powered systems. The RT6208 is available in a SOT-23-6, SOT-23-8 and SOP-8 (Exposed Pad, with power good function) packages. Product Feature Achieves Very High Efficiency in Low Load Conditions ±1% High Accuracy Feedback Voltage 4.5V to 36V Input Voltage Range 100mA Output Current Integrated High-Side and Low-Side Switches No Compensation Required Low Quiescent Current Adjustable Peak Current Limit Cycle-by-Cycle Over Current Protection Input Under Voltage Lockout Internal Soft-Start Thermal Shutdown Protection Key Performance Summary Table Key Features Evaluation Board Number : PCB051_V1 Default Input Voltage 12V Max Output Current 100mA Default Output Voltage 1.8V, 3.3V, 5V Optional Default Marking & Package Type RT6208GE, SOT-23-6 Operation Mode Boundary Conduction Mode (BCM) Other Key Features 4.5V to 36V Input Voltage Range Support duty up to 95% Protection Cycle-by-Cycle Over Current Protection Thermal Shutdown EVB_RT6208GE-00 November 2015 2 http://www.richtek.com RT6208GE Evaluation Board your power partner. Bench Test Setup Conditions Headers Description and Placement Please carefully inspect the EVB IC and external components, comparing them to the following Bill of Materials, to ensure that all components are installed and undamaged. If any components are missing or damaged during transportation, please contact the distributor or send e-mail to [email protected] Test Points The EVB is provided with the test points and pin names listed in the table below. Test point/ Pin name Signal Comment (expected waveforms or voltage levels on test points) VIN Input voltage Input voltage range = 4.5V to 36V VOUT Output voltage Default output voltage : 1.8V, 3.3V, 5V Optional Output voltage range = 0.8V to 5V SW Switching node test point SW waveform EN Enable test point Driving the EN pin high (>1.4V) will turn on the device again. Leaving the EN pin floating will pull the EN pin up to 2V internally and enable RT6208. ISET High-Side Peak Current Set Pin A resistor from this pin to GND sets the high-side peak current limit. Leave floating for the maximum peak current, 225mA. Short this pin to GND for the minimum peak current, 50mA. GND Ground Ground Power-up & Measurement Procedure 1. Apply a 12V nominal input power supply (4.5V < VIN < 36V) to the VIN and GND terminals. 2. There are 2-pin header 1.8V, 3.3V and 5V for output voltage. To use a jumper choose the output voltage level. 3. Verify the output voltage (approximately 1.8V, 3.3, 5.0V) between VOUT and GND. 4. Connect an external load up to 100mA to the VOUT and GND terminals and verify the output voltage and current. EVB_RT6208GE-00 November 2015 3 http://www.richtek.com RT6208GE Evaluation Board your power partner. Schematic, Bill of Materials & Board Layout EVB Schematic Diagram Bill of Materials Reference Qty Part Number Description Package Manufacture C1 1 0603N101J500 100pF/0603 C-0603 WALSIN C3 1 C2012X7R1H224KT000N 0.22µF/1206/50V C-1210 TDK C4 1 GRM31CR71H475KA12L 4.7µF/1206/50V C-1210 MURATA C9, C10 2 C3225X5R1E226MT 22µF/1206/25V C-1210 TDK C12 1 C1608X7R1H104KT000N 0.1µF/0603/50V C-0603 TDK Golden Pin 5 SIP-1P-GP VIN, GND, VOUT SIP-1P-GP J1 1 1.8V SIP-2P J2 1 3.3V SIP-2P J3 1 5V SIP-2P L1 1 MSCDRI5010 100µH 5x5 Mag.Layer RFB1 1 0603 750K 1% 750k/0603 R-0603 WALSIN RFB2 1 0603 143K 1% 143k/0603 R-0603 WALSIN RFB3 1 CR0603F240KP05 240k/0603 R-0603 EVER OHMS RFB4 1 0603T-1-604K 604k/0603 R-0603 WALSIN RSET 1 NC OPTION/0603 R-0603 R4 1 0603 4R70 1% 4.7R/0603 R-0603 Test Pin 5 EN, SW, FB, VOUT, ISET sip-1p-tp U1 1 DC/DC Converter SOT-23-6 EVB_RT6208GE-00 November 2015 RT6208GE 4 WALSIN RICHTEK http://www.richtek.com RT6208GE Evaluation Board your power partner. EVB Layout Top View Bottom View EVB_RT6208GE-00 November 2015 5 http://www.richtek.com RT6208GE Evaluation Board your power partner. More Information For more information, please find the related datasheet or application notes from Richtek website http://www.richtek.com. Important Notice for Richtek Reference Designs THIS DOCUMENT IS FOR REFERENCE ONLY, NOTHING CONTAINED IN THIS DOCUMENT SHALL BE CONSTRUED AS RICHTEK’S WARRANTY, EXPRESS OR IMPLIED, UNDER CONTRACT, TORT OR STATUTORY, WITH RESPECT TO THE PRESENTATION HEREIN. IN NO EVENT SHALL RICHTEK BE LIABLE T O BUYER OR USER FOR ANY AND ALL DAMAGES INCLUDING WITHOUT LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL DAMAGES. EVB_RT6208GE-00 November 2015 6 http://www.richtek.com