MIC5022 Micrel Semiconductor, MIC5022 Datasheet
MIC5022
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MIC5022 Summary of contents
Page 1
... The MIC5022 then supplies a limited current (< 2mA), if necessary, to maintain the output states. Two overcurrent comparators with nominal trip voltages of 50mV make the MIC5022 ideal for use with current sensing MOSFETs. External low value resistors may be used instead of sensing MOSFETs for more precise overcurrent control. ...
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... MOSFET source pin supplies charge to quickly enhance the external MOSFET’s gate . 179 BOOST Gate H 14 Sense H– 13 Sense Gate L 11 Sense L– Sense L+ 9 SOIC Package (WM capacitor adjustable from G(OFF) G(OFF) G(OFF Micrel ) of the SENSE SENSE to the BOOST MIC5022 ...
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... Absolute Maximum Ratings Supply Voltage (V ) .................................................. +40V DD Input Voltage .................................................. –0.5V to 15V Sense Differential Voltage .......................................... 6.5V Sense + or Sense – to Gnd .......................... –0.5V to +36V Fault Voltage ............................................................... +36V Current into Fault ....................................................... 50mA Timer Voltage (C ) ..................................................... +5. Capacitor .................................................... 0.01 F BOOST MIC5022 6V Internal Regulator I 1 Fault C Normal INT 2I 1 1.4V 15V ONE- SHOT 6V ...
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... Higher values may affect the sense MOSFET’s current transfer ratio. SENSE 181 Micrel Min Typ Max Units 0.8 1.4 2 0.8 1.4 2.0 V 0.1 V 0.15 0.4 V –1 0. 1.4 2.0 s 0.8 1.5 s 1.2 2.0 s 0.6 1.5 s 1.7 2.5 s 0.7 1.5 s 0.5 1.0 s 1.0 1.5 s MIC5022 ...
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... V = 12V 20 SUPPLY 15 HIGH SIDE 10 NOTE TIME ON OFF INDEPENDENT SUPPLY 0 0 100 1000 10000 C (pF) TH MIC5022 Gate to Source Voltage vs. Supply Voltage (V) SUPPLY Gate Turn-On/Off Delay vs. Gate Capacitance 5 4.5 GATE H SUPPLY 4.0 L ...
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... Input 0V TTL (H) Enable 0V 15V (max.) Gate H 0V 15V (max.) Gate L 0V 50mV 0V 50mV 0V Off Fault On Timing Diagram 2. Overcurrent Fault with Retry 5µs TTL (H) Input 0V TTL (H) Enable 0V 15V (max.) Gate H Source 15V (max.) Gate L 0V 50mV 0V 50mV 0V Off Fault On 183 Micrel MIC5022 ...
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... A signal greater than 1.4V (nominal) applied to the MIC5022 keeps both outputs off. An internal pull-down ENABLE GATE resistor insures that the MIC5022 is enabled if the pin is open. Gate Outputs Rapid rise and fall times on the GATE because each input state change triggers a one-shot which ...
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... Sense Pin Considerations The sense pins of the MIC5022 are sensitive to negative voltages voltage spike is too negative (below approxi- mately –0.5V), current will be drawn from functional sections of the IC resulting in unpredictable circuit behavior or dam- age ...
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... TL 7 Gnd Sense L+ Synchronous Rectifier Converter The MIC5022 can be part of a synchronous rectifier in SMPS (switch mode power supply) applications. This circuit uses the MIC38C43 SMPS controller IC to switch a pass transistor (Q1) and a “synchronous rectifier” transistor (Q2) using the MIC5022. The MIC38C43 controller switches the transistors at 50kHz. ...