XP3182

XP3182 FINE MADE MICROELECTRONICS GROUP 18V2A Synchronous Buck Converter 1 Features 2 Applications Synchronous Buck Converter  - Internal Power MOSFET - Wide 4.5V to 18V Input Voltage Range - Output Current：2A - 600KHZ frequency Operation - 0.8V Reference Distributed Power Systems Digital Set Top Boxes Flat Panel Television and Monitors Notebook Computer Wireless and DSL Modems Efficiency @ Vout=5V - Soft Start 100.00% -Output Short With Hiccup Mode 90.00% Multiple Protection  · · · · · 80.00% - Input Over Voltage protection VIN=12V VIN=18V 70.00% - Input Under Voltage protection 60.00% - Output Over Voltage protection 50.00% 0 - Over Current protection With Hiccup 0.5 1 1.5 2 - Over Temperature Protection 3 Typical Application Circuit 4.5V~18V C3 0.1uF VIN option C1 BST C2 4.7uF SW L1 4.7uH R1 FB VOUT C3 22uF R2 ON/ OFF EN GND Note：The application scenario is that the DC power supply is directly plugged in, and it is recommended to add electrolytic capacitance at the input. 1 www.superchip.cn No: S&CIC1928 Copyright © 2019, FINE MADE MICROELECTRONICSGROUP FINE MADE MICROELECTRONICS GROUP XP3182 4 General Description The XP3182B is a high frequency, synchronous buck converter with internal power MOSFET. XP3182B supports wide input voltage range: 4.5V to 18V and provides 2.0A continuous load current capability, and provide high efficiency without use of external Schottky diode. Low output voltage ripple and small external inductor and capacitor size are achieved with 600KHz switching frequency XP3182B has a variety of protection functions：Input over voltage protection, Input UVLO, Output over current protection, Output short protection and thermal shutdown. The XP3182B is available in a 6-pin SOT23-6 package, which provides a compact solution with minimal external components. 2 www.superchip.cn No: S&CIC1928 Copyright © 2019, FINE MADE MICROELECTRONICSGROUP XP3182 FINE MADE MICROELECTRONICS GROUP 5 Pin Description BST 1 6 SW GND 2 5 VIN FB 3 4 EN top view Pin Name Function Bootstrap. A capacitor connected between SW and BST pins is required to form a floating supply across the high-side switch driver Ground 1 BST 2 GND 3 FB 4 EN 5 VIN Output Voltage feedback input Drive this pin to a logic‐high to enable the IC. Drive to a logic‐low to disable the IC and enter micro‐power shutdown mode Power Supply Pin 6 SW Switching Pin 6 Ordering Information Part Number Mark Specification Package XP3182B 3182 XXXX FB Reference : 0.8V SOT23-6 Mark description： First line：Device Code； Second line, XXXX：Lot Number. 3 www.superchip.cn No: S&CIC1928 Copyright © 2019, FINE MADE MICROELECTRONICSGROUP XP3182 FINE MADE MICROELECTRONICS GROUP 7 Specification 7.1 Limit Operating Parameter (1) Parameter Min Max Unit VIN -0.3 20 V VSW -0.3 VIN V VBST VSW-0.3 VSW+6 V VFB -0.3 6 V VEN -0.3 20 V TJ -40 150 ℃ TSTG -40 150 ℃ (1) Permanent device damage may occur if Absolute Maximum Ratings are exceeded. 7.2 ESD Rating Items VESDHBM Description Human Body Model for all pin Value Unit ±2000 V ESD test base on Human Body Model. 7.3 Recommended Operating Conditons Parameter Min Typ Max Unit VIN 4.5 12 18 V L 4.7 µH CIN 4.7 µF COUT 22 µF TA -40 85 ℃ Value Unit 170 ℃/W 7.4 Thermal Information Parameter RθJA 4 Description Junction-to-ambient thermal resistance www.superchip.cn No: S&CIC1928 Copyright © 2019, FINE MADE MICROELECTRONICSGROUP XP3182 FINE MADE MICROELECTRONICS GROUP 7.5 Electrical Characteristics VIN=12V, VOUT=5V, L=4.7uH, Ta=25℃ , unless other notes Parameters Symbol Condition VIN Under Voltage IUVLO VIN=4V Current Quiescent Current INOSW VIN=12V Supply Current in ISD VEN=0 or VEN=GND Shutdown FB Voltage Reference VFB XP3182B Minimum Turn-on VUVLO Voltage Maximum Turn-on VINOVP Voltage High-Side Switch RDSON_H On-Resistance Low-Side Switch RDSON_L On-Resistance Frequency FOSC 5 Min Typ Max Unit 80 uA 500 uA 1 uA 0.8 V 4 V 18 V 100 mΩ 70 mΩ 600 kHz Maximum Duty Cycle DMAX 90 % Minimum On Time TON 100 ns Minimum Off Time TOFF 200 ns Valley Current Limit ICC 2.5 A Soft Start Time TSS 2 mS Hiccup Time THICCUP 120 mS OTP TSD 150 ℃ www.superchip.cn No: S&CIC1928 Copyright © 2019, FINE MADE MICROELECTRONICSGROUP XP3182 FINE MADE MICROELECTRONICS GROUP 8 Detailed Description 8.1 Setting the output voltage Vout R1 FB R2 Set the output voltage The connection above shows the setting of the output voltage. The FB voltage of XP3182B is 0.8V, The external resistor divider is used to set the output voltage.R1,R2 is given by: VOUT=0.8V*(R1+R2)/R2 Vout 5V 3.3V 1.8V 1.2V 6 R1(KΩ) R2(KΩ) 100 100 100 100 19 32 80 200 www.superchip.cn No: S&CIC1928 Copyright © 2019, FINE MADE MICROELECTRONICSGROUP FINE MADE MICROELECTRONICS GROUP XP3182 8.2 Selecting the inductor For highest efficiency, the inductor DC resistance should be as low as possible. The recommended inductor values are shown in the application diagram. It is important to ensure that the inductor is not saturated in any situation. L=VOUT*(VIN-VOUT)/(VIN*△IL *fOSC) Where VIN is the input voltage, VOUT is the output voltage, fOSC is the switching frequency, and △IL is the peak-to-peak inductor ripple current. 8.3 Layout Guide 1. Input capacitance and high frequency decoupling small capacitors should be as close to the input pins as possible to improve filtering effect. 2. Inductor should be as close to the SW pin to reduce electromagnetic noise. 3. Output capacitance COUT should be as close to inductor. 4. Vout , SW away from sensitive analog areas such as FB. 7 www.superchip.cn No: S&CIC1928 Copyright © 2019, FINE MADE MICROELECTRONICSGROUP FINE MADE MICROELECTRONICS GROUP XP3182 9 Package Information 8 www.superchip.cn No: S&CIC1928 Copyright © 2019, FINE MADE MICROELECTRONICSGROUP