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MC34931 Fiches technique(PDF) 7 Page - Freescale Semiconductor, Inc |
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MC34931 Fiches technique(HTML) 7 Page - Freescale Semiconductor, Inc |
7 / 25 page Analog Integrated Circuit Device Data Freescale Semiconductor 7 34931 ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS POWER OUTPUTS OUT1, OUT2 Output-ON Resistance(14), ILOAD = 3.0 A VPWR = 8.0 V, TJ = 25 °C VPWR = 8.0 V, TJ = 150 °C VPWR = 5.0 V, TJ = 150 °C RDS(ON) – – – 120 – – – 235 325 m Ω Output Current Regulation Threshold TJ < TFB TJ ≥ TFB (Foldback Region - see Figure 9 and Figure 11)(13) ILIM 5.2 – 6.5 4.2 8.0 – A High Side Short-circuit Detection Threshold (Short Circuit to Ground)(13) ISCH 11 13 16 A Low Side Short-circuit Detection Threshold (Short Circuit to VPWR)(13) ISCL 9.0 11 14 A Output Leakage Current(15), Outputs off, VPWR = 28 V VOUT = VPWR VOUT = Ground IOUTLEAK – -60 – – 100 – μA Output MOSFET Body Diode Forward Voltage Drop, IOUT = 3.0 A VF – – 2.0 V Overtemperature Shutdown(13) Thermal Limit @ TJ Hysteresis @ TJ TLIM THYS 175 – – 12 200 – °C Current Foldback at TJ (13) TFB 165 – 185 °C Current Foldback to Thermal Shutdown Separation(13) TSEP 10 – 15 °C HIGH SIDE CURRENT SENSE FEEDBACK Feedback Current (pin FB sourcing current)(16) IOUT = 0 mA IOUT = 300 mA IOUT = 500 mA IOUT = 1.5 A IOUT = 3.0 A IOUT = 6.0 A IFB 0.0 0.0 0.35 2.86 5.71 11.43 – 270 0.775 3.57 7.14 14.29 50 750 1.56 4.28 8.57 17.15 μA μA mA mA mA mA STATUS FLAG(17) Status Flag Leakage Current(18) VSF = 5.0 V ISFLEAK – – 5.0 μA Status Flag SET Voltage(19) ISF = 300 µA VSFLOW – – 0.4 V Notes 13. This parameter is Guaranteed By Design. 14. Output-ON resistance as measured from output to VPWR and from output to GND. 15. Outputs switched OFF via D1 or EN/D2. 16. Accuracy is better than 20% from 0.5 A to 6.0 A. Recommended terminating resistor value: RFB = 270 Ω. 17. Status Flag output is an open drain output requiring a pull-up resistor to logic VDD. 18. Status Flag Leakage Current is measured with Status Flag HIGH and not SET. 19. Status Flag Set Voltage measured with Status Flag LOW and SET with ISF = 300 μA. Maximum allowable sink current from this pin is <500 μA. Maximum allowable pull-up voltage < 7.0 V. Table 3. Static Electrical Characteristics (continued) Characteristics noted under conditions 5.0 V ≤ VPWR ≤ 28 V, -40 °C ≤ TA ≤ 85 °C, GND = 0 V, unless otherwise noted. Typical values noted reflect the approximate parameter means at TA = 25 °C under nominal conditions, unless otherwise noted. Characteristic Symbol Min Typ Max Unit |
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