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MP2228 Fiches technique(PDF) 3 Page - Monolithic Power Systems |
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MP2228 Fiches technique(HTML) 3 Page - Monolithic Power Systems |
3 / 16 page MP2228 – SYNCHRONOUS STEP-DOWN CONVERTER MP2228 Rev. 1.1 www.MonolithicPower.com 3 8/20/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. ELECTRICAL CHARACTERISTICS VIN = 12V, TA = 25°C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units VFB = 1V, VAAM=0.5V 0.55 0.8 Supply Current (Quiescent) Iq VFB = 1V, VAAM=5V 0.75 1 mA HS Switch-On Resistance HSRDS-ON VBST-SW=5V 100 mΩ LS Switch-On Resistance LSRDS-ON VCC =5V 40 mΩ Switch Leakage SWLKG VSW =12V 0.1 μA Current Limit (5) ILIMIT Under 40% Duty Cycle 3 4.5 A Oscillator Frequency fSW VFB=0.75V 660 800 940 kHz Fold-Back Frequency fFB VFB<400mV 0.25 fSW Maximum Duty Cycle DMAX VFB=700mV 90 95 % Minimum On Time (5) τON_MIN 40 ns Feedback Voltage VFB TA =25°C 791 807 823 mV Feedback Current IFB VFB=820mV 10 50 nA VIN Under-Voltage Lockout Threshold—Rising INUVVth 4.9 5.3 5.85 V VIN Under-Voltage Lockout Threshold—Hysteresis INUVHYS 1.1 V VCC Regulator VCC 4.75 4.9 5.05 V VCC Load Regulation ICC=5mA 3 % Soft-Start Current ISS 7.6 10.5 13.4 μA Thermal Shutdown (5) 150 °C Thermal Hysteresis (5) 20 °C Notes: 5) Guaranteed by design. |
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