SCT2620MRER

芯 洲 科 SCT2620 技 Silicon Content Technology Rev. 1.2 3.8V-60V Vin, 2.5A, High Efficiency Step-down DCDC Converter with Programmable Frequency FEATURES DESCRIPTION             The SCT2620 is 2.5A buck converter with wide input voltage, ranging from 3.8V to 60V, which integrates an 220mΩ high-side MOSFET. The SCT2620, adopting the peak current mode control, supports the Pulse Skipping Modulation (PSM) which assists the converter on achieving high efficiency at light load or standby condition.     Wide Input Range: 3.8V-60V Up to 2.5A Continuous Output Current 0.8V ±1% Feedback Reference Voltage Integrated 220mΩ High-Side MOSFET Low Quiescent Current: 190uA Pulse Skipping Mode (PSM) in light load 100ns Minimum On-time Adjustable Soft-start Time Adjustable Frequency 100KHz to 1.2MHz UV and OV Power Good Output External Clock Synchronization Precision Enable Threshold for Programmable Input Voltage Under-Voltage Lock Out Protection (UVLO) Threshold and Hysteresis Low Dropout Mode Operation Derivable Inverting Voltage Regulator Over-voltage and Over-Temperature Protection Available in an EMSOP-10 Package APPLICATIONS    The SCT2620 features programmable switching frequency from 100 kHz to 1.2 MHz with an external resistor, which provides the flexibility to optimize either efficiency or external component size. The converter supports external clock synchronization with a frequency band from 100kHz to 1.2MHz. The SCT2620 allows power conversion from high input voltage to low output voltage with a minimum 100ns on-time of highside MOSFET. The device offers programmable soft start to prevent inrush current during the startup of output voltage ramping. The SCT2620 features external loop compensation to provide the flexibility to optimize either loop stability or loop response. The SCT2620 provides cycle-by-cycle current limit, thermal shutdown protection, output over-voltage protection and input voltage under-voltage protection. The device is available in an 10-pin EMSOP package. 12-V, 24-V, 48-V Industry and Telecom Power System Industrial Automation and Motor Control Vehicle Accessories TYPICAL APPLICATION 100 BOOT VIN C1 C2 SW VIN GND EN COMP 90 D1 VOUT C5 R1 R3 SS/TR FB RT/CLK PWRGD C6 C4 R2 80 Efficiency(%) C3 L1 70 60 50 40 30 Vout=3.3V 20 R4 Vout=5V 10 0 0.001 Vout=12V 0.01 0.1 1 Output Current(A) Efficiency, Vin=24V, Fsw=500KHz 3.8V-60V, Asyncronous Buck Converter For more information www.silicontent.com © 2020 Silicon Content Technology Co., Ltd. All Rights Reserved Product Folder Links: SCT2620 1 SCT2620 REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Revision 1.0: Release to production Revision 1.1: Update IEN_H in EC and system UVLO calculation formula by EN pin resistor divider Revision 1.2: Add SW 10ns transient abs spec DEVICE ORDER INFORMATION PART NUMBER PACKAGE MARKING PACKAGE DISCRIPTION SCT2620MRE 2620 EMSOP-10 1) For Tape & Reel, Add Suffix R (e.g. SCT2620MRER) ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION Over operating free-air temperature unless otherwise noted(1) BOOT 1 10 SW VIN 2 9 GND V EN 3 8 COMP 65 V SS/TR 4 7 FB -5 65 V RT/CLK 5 6 PWRGD BOOT-SW -0.3 6 V COMP, FB, RT/CLK, SS, PWRGD -0.3 6 V Operating junction temperature TJ(2) -40 150 °C Storage temperature TSTG -65 150 °C DESCRIPTION MIN MAX UNIT VIN, EN -0.3 65 V BOOT -0.3 72 SW -1 SW, 10-ns transient Figure 1. 10-Lead Plastic EMSOP Stresses beyond those listed under Absolute Maximum Rating may cause device permanent damage. The device is not guaranteed to function outside of its Recommended Operation Conditions. The IC includes over temperature protection to protect the device during overload conditions. Junction temperature will exceed 150°C when over temperature protection is active. Continuous operation above the specified maximum operating junction temperature will reduce lifetime. (1) (2) PIN FUNCTIONS NAME NO. BOOT 1 VIN 2 EN 3 SS/TR 4 RT/CLK 5 2 PIN FUNCTION Power supply bias for high-side power MOSFET gate driver. Connect a 0.1uF capacitor from BOOT pin to SW pin. Bootstrap capacitor is charged when SW voltage is low. Input supply voltage. Connect a local bypass capacitor from VIN pin to GND pin. Path from VIN pin to high frequency bypass capacitor and GND must be as short as possible. Enable pin to the regulator with internal pull-up current. Pull below 1.05V to disable the converter. Float or connect to VIN to enable the converter. The tap of resistor divider from VIN to GND connecting EN pin can adjust the input voltage lockout threshold. Slow-start and Tracking. An external capacitor connected to this pin sets the output rise time. Since the voltage on this pin overrides the internal reference, it can be used for tracking and sequencing. Set the internal oscillator clock frequency or synchronize to an external clock. Connect a resistor from this pin to ground to set switching frequency. An external clock can be input directly to the RT/CLK pin. The internal oscillator synchronizes to the external clock frequency with PLL. If detected clocking edges stops, the operation mode automatically returns to resistor programmed frequency. For more information www.silicontent.com © 2020 Silicon Content Technology Co., Ltd. All Rights Reserved Product Folder Links: SCT2620 SCT2620 PWRGD 6 FB 7 COMP 8 GND SW Thermal Pad 9 10 11 An open drain output, asserts low if output voltage is low due to thermal shutdown, dropout, over-voltage or EN shut down. Inverting input of the trans-conductance error amplifier. The tap of external feedback resistor divider from the output to GND sets the output voltage. The device regulates FB voltage to the internal reference value of 0.8V typical. Error amplifier output. Connect to frequency loop compensation network. Ground Regulator switching output. Connect SW to an external power inductor Heat dissipation path of die. Electrically connection to GND pin. Must be connected to ground plane on PCB for proper operation and optimized thermal performance. RECOMMENDED OPERATING CONDITIONS Over operating free-air temperature range unless otherwise noted PARAMETER DEFINITION VIN VOUT TJ Input voltage range Output voltage range Operating junction temperature MIN MAX UNIT 3.8 0.8 -40 60 57 150 V V °C MIN MAX UNIT -2 +2 kV -0.5 +0.5 kV ESD RATINGS PARAMETER DEFINITION Human Body Model(HBM), per ANSI-JEDEC-JS-001-2014 specification, all pins(1) Charged Device Model(CDM), per ANSI-JEDEC-JS-0022014 specification, all pins(2) VESD (1) JEDEC document JEP155 states that 500V HBM allows safe manufacturing with a standard ESD control process. (2) JEDEC document JEP157 states that 250V CDM allows safe manufacturing with a standard ESD control process. THERMAL INFORMATION PARAMETER THERMAL METRIC EMSOP-10L 𝜃𝑗𝑎 Junction-to-ambient thermal resistance (standard board) 𝜃𝑗𝑐𝑡𝑜𝑝 Junction-to-case (top) thermal resistance 83 𝜓𝑗𝑡 Junction-to-top characterization parameter 5.9 UNIT 62.5 °C/W ELECTRICAL CHARACTERISTICS VIN=24V, TJ=-40°C~125°C, typical value is tested under 25°C. SYMBOL PARAMETER TEST CONDITION Power Supply VIN Operating input voltage ISHDN Input UVLO Threshold Hysteresis Shutdown current from VIN pin IQ Quiescent current from VIN pin VIN_UVLO MIN TYP 3.8 VIN rising EN=0, no load EN floating, no load, nonswitching, BOOT-SW=5V, RRT=200 kΩ, FB=2V 3.5 400 2 MAX UNIT 60 V 5 V mV μA 190 μA Power MOSFETs For more information www.silicontent.com © 2020 Silicon Content Technology Co., Ltd. All Rights Reserved Product Folder Links: SCT2620 3 SCT2620 SYMBOL PARAMETER TEST CONDITION RDSON_H High-side MOSFET on-resistance VBOOT-VSW=5V Reference and Control Loop VREF Reference voltage of FB MIN TYP MAX 220 0.792 0.8 UNIT mΩ 0.808 V GEA Error amplifier trans-conductance -2μA