MP2307 KEXIN | Alldatasheet

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www.kexin.com.cn 1 ■ Features SMD Type ■ Absolute Maximum Ratings Ta = 25℃ Parameter Symbol Rating Unit Input Voltage Vin -0.3 to 26 V Switch Voltage VSW VIN +0.3 V Boot Strap Voltage VBS VSW-0.3 to VSW+6 V All Other Pins -0.3 to 6V V Power Dissipation PD 2.5 mW Thermal Resistance RθJA 50 ℃/W Junction Temperature Tj 150 ℃ Storage Temperature Tstg -65 to 150 ℃ Lead Temperature TL 260 ℃ ■ Recommended Operating Conditions Input Voltage Vin 4.75 to 23 V Output Voltage Vout 0.925 to 20 V Operating Temperature TA -40 to 85 ℃ 3A, 23V, 340KHz Synchronous Rectified Step-Down Converter MP2307

  • 3A Continuous Output Current, 4A Peak Output Current
  • Wide 4.75V to 23V Operating Input Range
  • Integrated 100m Ω Power MOSFET Switches
  • Output Adjustable from 0.925V to 20V
  • Up to 95% Efficiency
  • Programmable Soft-Start
  • Stable with Low ESR Ceramic Output Capacitors
  • Fixed 340KHz Frequency
  • Cycle-by-Cycle Over Current Protection
  • Input Under Voltage Lockout SOP-8 -1 to BS IN SW GND SS EN COMP FB Functional Block Diagram LOCKOUT COMPARATOR INTERNAL REGULATORS IN EN ERROR AMPLIFIER 1.2V OVP RAMP CLK 0.925V 0.3V CURRENT COMPARATOR CURRENT SENSE AMPLIFIER 1.1V SHUTDOWN COMPARATOR COMP 6 SS 8 FB 5 GND4 OSCILLATOR 110/340KHz S R Q SW3 BS IN OVP IN < 4.10V EN OK Zener Q 1.5V 2.5V

■ Electrical Characteristics (Ta = 25℃, VIN=12V,unless otherwise specified) Parameter Symbol Condition Min Typ Max Units Shutdown Supply Current V EN = 0V 0.3 3.0 µA Supply Current V EN = 2.0V, V FB = 1.0V 1.3 1.5 mA Feedback Voltage V FB 4.75V ≤ V IN ≤ 23V 0.900 0.925 0.950 V Feedback Overvoltage Threshold 1.1 V Error Amplifier Voltage Gain (4) A EA

400 V/V

Error Amplifier Transconductance G EA C = ±10µA 820 µA/V High-Side Switch On-Resistance (4) R DS(ON)1 100 m Ω Low-Side Switch On-Resistance (4) R DS(ON)2 100 m Ω High-Side Switch Leakage Current V EN = 0V, V SW = 0V 0 10 µA Upper Switch Current Limit Minimum Duty Cycle 4.0 5.8 A Lower Switch Current Limit From Drain to Source 0.9 A COMP to Current Sense Transconductance G CS

5.2 A/V

Short Circuit Oscillation Frequency F osc2 V FB = 0V 110 KHz Maximum Duty Cycle D MAX V FB = 1.0V 90 % Minimum On Time (4) T ON 220 ns EN Shutdown Threshold Voltage V EN Rising 1.1 1.5 2.0 V EN Shutdown Threshold Voltage Hysterisis 220 mV EN Lockout Threshold Voltage 2.2 2.5 2.7 V EN Lockout Hysterisis 210 mV Input Under Voltage Lockout Threshold V IN Rising 3.80 4.05 4.40 V Input Under Voltage Lockout Threshold Hysteresis 210 mV Soft-Start Current V SS = 0V 6 µA Soft-Start Period C SS = 0.1µF 15 ms Thermal Shutdown (1) 160 °C Note: 1) Guaranteed by design, not tested. ■ Typlacl Characteristics INPUT 4.75V to 23V OUTPUT 3.3V 3.9nF 10nF MP2307 BSIN FB SW SS GND COMP EN MP2307_TAC01 100 EFFICIENCY (%) 0.1 1.0 10 LOAD CURRENT (A) Efficiency vs Load Current V IN = 5V V IN = 23V V IN = 12V www.kexin.com.cn 2

www.kexin.com.cn ■ Typical Characteristics Integrate Circuit MP2307 V IN 20mV/div. V OUT 20mV/div. V SW 10V/div. I L 1A/div. MP2307-TPC01 Steady State Test Waveforms V IN = 12V, V OUT = 3.3V, I OUT = 0A V IN 200mV/div. V OUT 20MV/div. V SW V/div. I L 2A/div. MP2307-TPC02 Steady State Test Waveforms V IN = 12V, V OUT = 3.3V, I OUT = 3A V EN 5V/div. V OUT 2V/div. V SW 10V/div. I L 1A/div. 2ms/div. MP2307-TPC03 Startup through Enable Waveforms V IN = 12V, V OUT = 3.3V, No Load V EN 5V/div. V OUT 2V/div. V SW 10V/div. I L 2A/div. 2ms/div. MP2307-TP04 Startup Through Enable Waveforms V IN = 12V, V OUT = 3.3V, I OUT = 3A (Resistance Load) V EN 5V/div. V OUT 2V/div. V SW 10V/div. I L 1A/div. 2ms/div. MP2307-TPC05 Shutdown Through Enable Waveforms V IN = 12V, V OUT = 3.3V, No Load V OUT 2V/div. V SW 10V/div. V EN 5V/div. I L 2A/div. MP2307-TPC06 Shutdown Through Enable Waveforms V IN = 12V, V OUT = 3.3V, I OUT = 3A (Resistance Load) V OUT 200mV/div. I L 1A/div. I LOAD 1A/div. MP2307 -TPC07 Load Transient Test Waveforms V IN = 12V, V OUT = 3.3V, I OUT = 1A to 2A step V OUT 2V/div. I L 2A/div. MP2307-TPC08 Short Circuit Test Waveforms V IN = 12V, V OUT = 3.3V V OUT 2V/div. I L 2A/div. Short Circuit Recovery Waveforms V IN = 12V, V OUT = 3.3V