TCS4572

TCS4572 １８Ｖ／２Ａ　Ｓｙｎｃ．　Ｓｔｅｐ－Ｄｏｗｎ　Ｃｏｎｖｅｒｔｅｒ Features       4.5V to 18V operating input range 2A output current Up to 95% efficiency PFM at light load 1.14MHz switching frequency Internal soft-start     Input under-voltage lockout Current run-away protection Output short protection Thermal protection Available in SOT23-6 package Applications    Distributed Power Systems Networking Systems  FPGA, DSP, ASIC Power Supplies  Green Electronics/ Appliances Notebook Computers General Description The TCS4572 is monolithic buck switching regulators based on COT architecture for fast transient response. Operating with an input range of 4.5V~18V, TCS4572 delivers 2A of continuous output current with two integrated N-Channel MOSFETs. The internal synchronous power switches provide high efficiency without the use of an external Schottky diode. At light loads, TCS4572 operates in low frequency to maintain high efficiency. TCS4572 guarantees robustness with output short protection, thermal protection, current run-away protection and input under voltage lockout. TCS4572 is available in SOT23-6 package, which provide s a compact solution with minimal external components. Typical Application C2 VIN VIN BST L SW R1 C1 VOUT C5 EN TCS4572 FB R3 R2 R4 GND Ver.1.0 Mar.17.2024 Page 1 C3 C4 TCS4572 １８Ｖ／２Ａ　Ｓｙｎｃ．　Ｓｔｅｐ－Ｄｏｗｎ　Ｃｏｎｖｅｒｔｅｒ Pin Configuration TOP VIEW BST 1 6 SW GND 2 5 VIN FB 3 4 EN SOT23-6 Pin Description Pin Name 1 BST 2 GND 3 FB 4 EN Description Connect a 0.1μF capacitor between BST and SW pin to supply voltage for the top switch driver. Ground pin. Output feedback pin. FB senses the output voltage and is regulated by the control loop to 0.6V. Connect a resistive divider at FB. Drive EN pin high to turn on the regulator and low to turn off the regulator. Input voltage pin. VIN supplies power to the IC. Connect a 4.5V to 18V supply to VIN and 5 VIN bypass VIN to GND with a suitably large capacitor to eliminate noise on the input to the IC. 6 SW SW is the switching node that supplies power to the output. Connect the output LC filter from SW to the output load. Package Marking and Order Information Part No. TCS4572_F Package Tape & Reel SOT23-6 3000pcs/reel Ver.1.0 Mar.17.2024 Page 2 TCS4572 １８Ｖ／２Ａ　Ｓｙｎｃ．　Ｓｔｅｐ－Ｄｏｗｎ　Ｃｏｎｖｅｒｔｅｒ Block Diagram VIN + Current Sensor - 3.3V BST On Timer Adjustment - FB + 0.6V + Internal Soft Start 1.2V SW Logic Control FB Comparator LDO - + Current Sensor EN + - GND Ver.1.0 Mar.17.2024 Page 3 TCS4572 １８Ｖ／２Ａ　Ｓｙｎｃ．　Ｓｔｅｐ－Ｄｏｗｎ　Ｃｏｎｖｅｒｔｅｒ Specifications Absolute Maximum Rating 1） Item Min Max Unit -0.3 20 V SW Pin -0.3(-5 for 10ns) 20(22 for 10ns) V BST Pin SW-0.3 SW+4 V -0.3 4 V Junction Temperature 2) 150 ºC Lead Temperature 260 ºC 150 ºC VIN, EN Pin All other Pins Storage Temperature -65 Recommended Operating Conditions3） Item Min Max Unit Operating Junction Temperature Tj -40 125 ºC Input Voltage VIN 4.5 18 V Output Voltage VOUT 0.6 VIN *Dmax V Item θJA θJc Unit SOT23-6 220 130 ºC/W Thermal Performance4） Notes： 1) 2) Exceeding these ratings may damage the device. These stress ratings do not imply function operation of the device at any other conditions beyond those indicated under RECOMMENDED OPERATING CONDITIONS. The TCS4572 includes thermal protection that is intended to protect the de vice in o verload conditions . Continuous 3) 4) operation over the specified absolute maximum operating junction temperature may damage the device. The device is not guaranteed to function outside of its operating conditions. Measured on JESD51-7, 4-layer PCB. Ver.1.0 Mar.17.2024 Page 4 TCS4572 １８Ｖ／２Ａ　Ｓｙｎｃ．　Ｓｔｅｐ－Ｄｏｗｎ　Ｃｏｎｖｅｒｔｅｒ Electrical Characteristics VIN=12V, T A=25℃，Unless otherwise stated . Parameter Symbol Conditions Typ. Max. Unit 3.85 4.2 4.45 V VIN Under Voltage Lockout Threshold VIN_MIN VIN Under voltage Lockout Hysteresis VIN_MIN_HYST Shutdown Supply Current ISD VEN=0V 0.1 1 μA Supply Current IQ VEN=5V, VFB=1V 140 200 μA Feedback Voltage VFB 4.5V