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MIC2128 Datasheet(PDF) 4 Page - Microchip Technology |
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MIC2128 Datasheet(HTML) 4 Page - Microchip Technology |
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4 / 32 page  MIC2128 DS20005620A-page 4 2016 Microchip Technology Inc. ELECTRICAL CHARACTERISTICS (Note 1) Electrical Specifications: unless otherwise specified, VIN = 12V, VOUT = 1.2V; VBST -VSW =5V, TA =+25°C. Boldface values indicate -40°C TJ +125°C (Note 2). Parameter Symbol Min. Typ. Max. Units Test Conditions Power Supply Input Input Voltage Range VVIN 4.5 — 5.5 VPVDD and VDD shorted to VIN (VPVDD =VVIN =VVDD) 5.5 — 75 Quiescent Supply Current IQ —1.4 1.8 mA VFB = 1.5V, no switching Shutdown Supply Current IVIN(SHDN) —0.1 5 µA EN = Low —30 60 µA EN = Low, VIN =VDD =5.5V PVDD,VDD and EXTVDD PVDD Output Voltage VPVDD 4.8 5.1 5.4 VVVIN = 7V to 75V, IPVDD =10mA VDD UVLO Threshold VVDD_UVLO_Rise 3.7 4.2 4.5 VVDD rising VDD UVLO Hysteresis VVDD_UVLO_Hys —600 — mV VDD falling EXTVDD Bypass Threshold VEXTVDD_Rise 4.4 4.6 4.85 V EXTVDD rising EXTVDD Bypass Hysteresis VEXTVDD_Hys —200 — mV EXTVDD Dropout Voltage — 250 — mV VEXTVDD =5V, IPVDD =25mA Reference Feedback Reference Voltage VREF 0.597 0.6 0.603 V TJ = 25°C 0.594 0.6 0.606 V -40°C TJ 125°C FB Bias Current IFB —50 500 nA VFB = 0.6V Enable Control EN Logic Level High VEN_H 1.6 —— V EN Logic Level Low VEN_L —— 0.6 V EN Hysteresis VEN_Hys —150 — mV EN Bias Current IEN —6 30 µA VEN =12V ON Timer Switching Frequency f0 —800 — kHz VFREQ =VVIN, VVIN =12V 230 270 300 VFREQ = 33% of VVIN, VVIN =12V Maximum Duty Cycle DMAX —85 — % VFREQ =VVIN = 12V Minimum Duty Cycle DMIN —0 — % VFB > 0.6V Minimum ON Time tON(MIN) —80 — ns Minimum OFF Time tOFF(MIN) 150 230 350 ns Soft-Start Soft-Start Current Source ISS —1.3 — µA Current Limit Current-Limit Comparator Offset VOFFSET -15 0 15 mV VFB = 0.59V ILIM Source Current ICL 80 96 110 µA VFB = 0.59V ILIM Source Current Tempco — 0.3 — µA/°C Negative Current Limit Comparator Threshold —— 48 — mV Note 1: Specification for packaged product only. 2: The application is fully functional at low VDD (supply of the control section) if the external MOSFETs have low voltage VTH. |
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