Silicon Content Technology

1 SCT2A10 For more information 2019 Silicon Content Technology Co., Ltd. All Rights Reserved 1 Product Folder Links: SCT2A10 Silicon Content Technology Vin, , High Efficiency Synchronous Step-down DCDC Converter with Programmable Frequency FEATURES Wide Input Range: Continuous Output Current 1% Feedback Reference Voltage Integrated 750m High-Side and 500m Low-Side Power MOSFETs Pulse Frequency Modulation (PFM) with 100uA Quiescent Current in Sleep Mode 4ms Internal Soft-start Time Adjustable Frequency 300 KHz to 800 KHz Precision Enable Threshold for Programmable Input Voltage Under-voltage Lock Out Protection (UVLO) Threshold and Hysteresis Cycle-by-Cycle Current Limiting Over-Voltage Protection Over-Temperature Protection Available in an ESOP-8 Package APPLICATIONS E-Tools E-bike, Scooter GPS Tracker DESCRIPTION The SCT2A10 is synchronous buck converters with wide input voltage, ranging from to 85V, which integrates an 750m high-side MOSFET and a 500m low-side MOSFET.

2 The SCT2A10, adopting the constant-on time (COT) mode control, supports the PFM with typical 100uA low quiescent current which assists the converter on achieving high efficiency at light load or standby condition. The SCT2A10 features programmable switching frequency from 300 kHz to 800kHz, which provides the flexibility to optimize either efficiency or external component size. The SCT2A10 offers cycle-by-cycle current limit and hiccup over current protection, thermal shutdown protection, output over-voltage protection and input voltage under-voltage protection. The device is available in an 8-pin thermally enhanced SOP-8 package. TYPICAL APPLICATION Efficiency of VOUT=12V (%)Output Current (A)VIN=48 VVIN=56 VVIN=72VL1 R3R4R5C2 VOUTR1R2C1C4 GNDVINENRTSWBSTNCFBSCT2A10 VINSCT2A10 2 For more information 2019 Silicon Content Technology Co.

3 , Ltd. All Rights Reserved Product Folder Links: SCT2A10 REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Revision : Release to Market DEVICE ORDER INFORMATION PART NUMBER PACKAGE MARKING PACKAGE DISCRIPTION SCT2A10 STE 2A10 8-Lead Plastic ESOP 1 For Tape & Reel, Add Suffix R ( SCT2A10 STER). ABSOLUTE MAXIMUM RATINGS Over operating free-air temperature unless otherwise noted(1) PIN CONFIGURATION DESCRIPTION MIN MAX UNIT Figure 1. 8-Lead Plastic E-SOP VIN, EN 90 V BOOT 96 V SW -1 90 V BOOT-SW 6 V FB, RT 6 V Operating junction temperature TJ(2) -40 150 C Storage temperature TSTG -65 150 C (1) 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.

4 (2) 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. PIN FUNCTIONS NAME NO. PIN FUNCTION GND 1 Ground VIN 2 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. EN 3 Enable pin to the regulator with internal pull-up current source. Pull below 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. RT 4 Set the internal oscillator clock frequency or synchronize to an external clock.

5 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. FB 5 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 typical. NC 6 NC SWBST12345678 GNDVINENRTNCFBT herm al PAD9 SCT2A10 For more information 2019 Silicon Content Technology Co., Ltd. All Rights Reserved 3 Product Folder Links: SCT2A10 BST 7 Power supply bias for high-side power MOSFET gate driver. Connect a capacitor from BOOT pin to SW pin.

6 Bootstrap capacitor is charged when low-side power MOSFET is on or SW voltage is low. SW 8 Regulator switching output. Connect SW to an external power inductor Thermal Pad 9 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 MIN MAX UNIT VIN Input voltage range 85 V VOUT Output voltage range 24 V TJ Operating junction temperature -40 125 C ESD RATINGS PARAMETER DEFINITION MIN MAX UNIT VESD Human Body Model(HBM), per ANSI-JEDEC-JS-001-2014 specification, all pins(1) -2 +2 kV Charged Device Model(CDM), per ANSI-JEDEC-JS-002-2014 specification, all pins(2) + kV (1) JEDEC document JEP155 states that 500V HBM allows safe manufacturing with a standard ESD control process.

7 (2) JEDEC document JEP157 states that 250V CDM allows safe manufacturing with a standard ESD control process. THERMAL INFORMATION PARAMETER THERMAL METRIC DFN-20L UNIT R JA Junction to ambient thermal resistance(1) 42 C/W R JC Junction to case thermal resistance(1) (1) SCT provides R JA and R JC numbers only as reference to estimate junction temperatures of the devices. R JA and R JC are not a characteristic of package itself, but of many other system level characteristics such as the design and layout of the printed circuit board (PCB) on which the SCT2A10 is mounted, thermal pad size, and external environmental factors. The PCB board is a heat sink that is soldered to the leads and thermal pad of the SCT2A10. Changing the design or configuration of the PCB board changes the efficiency of the heat sink and therefore the actual R JA and R JC.

8 ELECTRICAL CHARACTERISTICS VIN=48V, TJ=-40 C~125 C, typical value is tested under 25 C. SYMBOL PARAMETER TEST CONDITION MIN TYP MAX UNIT Power Supply VIN Operating input voltage 85 V VIN_UVLO Input UVLO Threshold VIN rising V Hysteresis 400 mV ISHDN Shutdown current from VIN pin EN=0, no load 3 A IQ Quiescent current from VIN pin EN floating, no load, non- switching, BOOT-SW=5V 100 A Power MOSFETs RDSON_H High-side MOSFET on-resistance VBOOT-VSW=5V 750 m SCT2A10 4 For more information 2019 Silicon Content Technology Co., Ltd. All Rights Reserved Product Folder Links: SCT2A10 SYMBOL PARAMETER TEST CONDITION MIN TYP MAX UNIT RDSON_L Low-side MOSFET on-resistance 500 m Reference and Control Loop VREF Reference voltage of FB V GEA Error amplifier trans-conductance -2 A<ICOMP<2 A, VCOMP=1V 50 S Enable and Soft-startup VEN_H Enable high threshold V VEN_L Enable low threshold V IEN_L Enable pin pull-up current EN=1V 1 A IEN_H Enable pin pull-up current EN= 4 uA Tss Internal soft start time 4 ms Switching Frequency Timing FRANGE_RT Frequency range using RT mode 300 800 kHz FSW Switching frequency RRT=500 k (1%)

9 420 500 600 kHz TOFF_MIN Minimum off-time VIN=12V 200 260 ns Current Limit and Over Current Protection ILIM_P LS MOSFET positive current limit From source to drain A THICCUP Hiccup waiting time Numbers of soft-start cycles 7 cycles DHICCUP Hiccup duty cycle % Protection VOVP Feedback overvoltage with respect to VFB/VREF rising 110 % reference voltage VFB/VREF falling 105 % TSD Thermal shutdown threshold TJ rising 167 C Hysteresis 35 C SCT2A10 For more information 2019 Silicon Content Technology Co., Ltd. All Rights Reserved 5 Product Folder Links: SCT2A10 TYPICAL CHARACTERISTICS Figure 2. Efficiency vs Load Current Figure 3. Efficiency vs Load Current Figure 4. Load Regulation (Vout=12V) Figure vs Temperature Figure 6. Shut-down Current vs Temperature Figure 7. Iq vs Temperature (%)Output Current (A)VIN=36V Vout=12 VVIN=48V Vout=12 VVin=36V, Vout=5 VVin=48V, Vout= (%)Output Current (A)VIN=56V Vout=12 VVIN=72V Vout=12 VVin=56V, Vout=5 VVin=72V, Vout= (V)Output Current (A)VIN=36 VVIN=48 VVIN=56V30035040045050055060065070075020 30405060708090fsw (KHz)Input Votlage (V)Rt=487 KRt= (uA)Temperature ( C)60708090100110120-50050100150Iq (uA)Temperature ( C)SCT2A10 6 For more information 2019 Silicon Content Technology Co.

10 , Ltd. All Rights Reserved Product Folder Links: SCT2A10 FUNCTIONAL BLOCK DIAGRAM Figure 8. Functional Block Diagram +EN LOGICVIN UVLOR eferenceVCCBoot UVLOBootCharge+110%VREFOVPVCCVREF3uA1uA2 0 KVINS tart-upRegulator+Soft-startTimer++RTICMP EA+VCCSCT2A10 For more information 2019 Silicon Content Technology Co., Ltd. All Rights Reserved 7 Product Folder Links: SCT2A10 OPERATION Overview The SCT2A10 is a input, output, internal-compensated synchronous buck converter with built-in 750m Rdson high-side and 500m Rdson low-side power MOSFETs. It implements constant on time control to regulate output voltage, providing excellent line and load transient response. The switching frequency is programmable from 300kHz to 800 KHz with resistor setting to optimizes either the power efficiency or the external components sizes.