SY8511ADC

SY8511 High Efficiency, 200kHz, 100V Input, 0.6A Asynchronous Step Down Regulator General Description Features SY8511 is a high efficiency, current mode adaptive constant off time controlled asynchronous step-down DC/DC converter capable of delivering 0.6A output current. The SY8511 operates over a wide input voltage range from 4.5V to 100V and integrates main switch with very low RDS(ON) to minimize the conduction loss. Ordering Information SY8511 □(□□)□ Temperature Code Package Code Optional Spec Code Ordering Number SY8511ADC Package Type TSOT23-6 • Low RDS(ON) for Internal N-channel Power FET:1Ω • 4.5-100V Input Voltage Range • 0.6A Output Current Capability • 200kHz Pseudo Constant Switching Frequency • Internal Soft-start Limits the Inrush Current • Hic-cup Mode Output Short Circuit Protection • EN ON/OFF Control with Accurate Threshold • Cycle by Cycle Peak Current Limit • 0.6V±1 % Reference Voltage • TSOT23-6 Package Applications • Non-isolated Telecommunication Buck Regulator • Secondary High Voltage Post Regulator • Automotive Systems • Electric Bicycle Note Typical Application Efficiency vs. Output Current (L=68µH/CDRH8D43-680NC) 100 90 C BS R BS 1 VIN 5 L1 BS IN LX VOUT 6 C IN R1 ON/ OFF 4 EN FB C4 (opt.) Efficiency (%) 80 70 60 50 40 VIN =24V,VOUT =12V C OUT 30 VIN =48V,VOUT =12V VIN =85V,VOUT =12V 20 3 GND 2 R2 10 0.001 0.01 0.1 Output Current (A) Figure1. Schematic Diagram SY8511 Rev. 0.9C © 2020 Silergy Corp. Figure2. Efficiency vs. Output Current Silergy Corp. Confidential- Prepared for Customer Use Only 1 All Rights Reserved. SY8511 Pinout (top view) BS 1 6 LX GND 2 5 IN FB 3 4 EN (TSOT23-6) Top Mark: fKxyz (device code: fK, x=year code, y=week code, z= lot number code) Pin Name Pin Number BS 1 GND 2 FB 3 EN IN LX 4 5 6 Pin Description Boot-strap pin. Supply high side gate driver. Connect a 0.1µF ceramic capacitor in series with a10Ω resistor between the BS and the LX pin. Ground pin. Output feedback pin. Connect this pin to the center point of the output resistor divider (as shown in figure 1) to program the output voltage: VOUT=0.6×(1+R1/R2). Enable control. Pull high to turn on. Do not float. Input pin. Decouple this pin to GND pin with at least a 1µF ceramic capacitor. Inductor pin. Connect this pin to the switching node of the inductor. Function Block IN Current Sense Comp Internal Power Input UVLO Current Limitation VCC BS Power FET VCC PWM Control & Protection Logic EN Enable Threshold Internal SST LX OTP SCP GND VREF FB EA Figure3. Block Diagram SY8511 Rev. 0.9C © 2020 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 2 All Rights Reserved. SY8511 Absolute Maximum Ratings (Note 1) Supply Input Voltage ---------------------------------------------------------------------------------------------- -0.3V to 100V BS-LX Voltage---------------------------------------------------------------------------------------------------------- -0.3V to 6V FB, EN, LX Voltage ----------------------------------------------------------------------------------------- -0.3V to VIN + 0.3V Power Dissipation, P D @ TA = 25°C TSOT23-6 -------------------------------------------------------------------- 1W Package Thermal Resistance (Note 2) θ JA --------------------------------------------------------------------------------------------- ---------- 100°C/W θ JC -------------------------------------------------------------------------------------------------------- 25°C/W Junction Temperature Range------------------------------------------------------------------------------------- -40°C to 150°C Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------- 260°C Storage Temperature Range ------------------------------------------------------------------------------------- -65°C to 150°C Dynamic LX Voltage in10ns Duration--------------------------------------------------------------------- IN+3V to GND-5V Recommended Operating Conditions (Note 3) Supply Input Voltage ------------------------------------------------------------------------------------------- 4.5V to 100V Junction Temperature Range -------------------------------------------------------------------------------- -40°C to 125°C Ambient Temperature Range -------------------------------------------------------------------------------- -40°C to 85°C Electrical Characteristics (VIN = 48V, VOUT = 12V, L = 6.8µH, COUT = 10µF, TA = 25°C, IOUT =0.1A, unless otherwise specified.) Parameter Symbol Test Conditions Min Typ Max Input Voltage Range VIN 4.5 100 Quiescent Current IQ IOUT=0, VFB=VREF×105% 100 Shutdown Current ISHDN EN=0 9 20 Feedback Reference VREF 0.594 0.6 0.606 Voltage FB Input Current IFB VFB=VIN -50 50 Power FET RON RDS(ON)1 1 Power FET Peak Current ILIM,TOP 0.9 1.3 Limit EN Rising Threshold VENH 1.14 1.2 1.26 EN Falling Threshold VENL 0.94 1 1.06 Input UVLO Threshold VUVLO 4.5 Input UVLO Hysteresis VUVLO, HYS 110 Switching Frequency FSW 200 Switching Frequency FSW,ACC -20 20 Accuracy Min ON Time tON,MIN 80 Min Off Time tOFF,MIN 80 Soft-start Time tSS 800 Thermal Shutdown TSD 150 Temperature Thermal Shutdown THYS 15 Hysteresis Unit V µA µA V nA Ω A V V V mV kHz %FSW ns ns µs °C °C Note 1: Stresses beyond “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may affect device reliability. Note 2: θ JA is measured in the natural convection at TA = 25°C on a two-layer Silergy Evaluation Board. Note 3: The device is not guaranteed to function outside its operating conditions. SY8511 Rev. 0.9C © 2020 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 3 All Rights Reserved. SY8511 TSOT23-6 Package Outline & PCB Layout Top view Side view Front view Notes: Recommended Pad Layout All dimension in millimeter and exclude mold flash & metal burr. SY8511 Rev. 0.9C © 2020 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 4 All Rights Reserved. SY8511 Taping & Reel Specification 1. Taping orientation TSOT23-6 Feeding direction 2. Carrier Tape & Reel specification for packages Reel Size Package types Tape width (mm) Pocket pitch(mm) Reel size (Inch) Trailer length(mm) Leader length (mm) Qty per reel 8 4 7" 400 160 3000 TSOT23-6 3. Others: NA SY8511 Rev. 0.9C © 2020 Silergy Corp. Powered by TCPDF (www.tcpdf.org) Silergy Corp. Confidential- Prepared for Customer Use Only 5 All Rights Reserved.