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MIC1344YFT Datasheet(PDF) 3 Page - Micrel Semiconductor |
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MIC1344YFT Datasheet(HTML) 3 Page - Micrel Semiconductor |
3 / 17 page Micrel, Inc. MIC1344 April 24, 2015 3 Revision 1.0 Pin Description (Continued) Pin Number Pin Name Pin Function 7 ENA The ENA and ENB digital inputs control which voltage input (INA or INB) is connected to the voltage out (OUT) pin. There is an internal 570k Ω pull-down on this pin to ensure that automatic select mode is active when the logic that is driving the MIC1344 is being powered-up. Table 1 shows how to control the power routing with the ENA and ENB inputs. 8 ILIMA A resistor from this pin to ground sets the current limit for INA. The current flowing into INA can be monitored by the voltage on this pin. 9 ASEL\ Open Drain Output. Low if Input A (INA) is providing power to the OUT pin. 10 STAOK Open drain output, digital status monitor for supply voltage Input A (INA). Voltage will be low if any of the following conditions occur: • INA is below the UVLO limit. • The output current from INA is at its set current limit. • The die temperature exceeds the overtemperature limit. • Reverse current detected (VOUT > VINA+100mV). • Prolonged high hysteresis mode engaged. 11 INA Supply Voltage Input A. This input may be bypassed to GND with >0.1µF, X7R or similar, ceramic type capacitor. This input is hot swappable. 12 OUT Voltage Output. This is the power output. Bypass this pin to ground with a capacitor suitable to provide adequate power during the switchover time of the MIC1344. This capacitor should be a minimum of 10µF, X7R or similar temperature stability, ceramic capacitor. EP ePad Internally connected to electrical ground (GND) pin. Connect to as large a PCB area as practical to dissipate heat from the MIC1344. |
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