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LTC4232-1 Datasheet(PDF) 6 Page - Linear Technology |
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LTC4232-1 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 16 page  LTC4232-1 6 42321f For more information www.linear.com/LTC4232-1 PIN FUNCTIONS FB: Foldback and Power Good Input. Connect this pin to an external resistive divider from OUT. If the voltage falls below 0.6V, the current limit is reduced using a foldback profile (see the Typical Performance Characteristics sec- tion). If the voltage falls below 1.21V, the PG pin will pull low to indicate the power is bad. FLT: Overcurrent Fault Indicator. Open-drain output pulls low when an overcurrent fault has occurred and the circuit breaker trips. For overcurrent auto-retry tie to UV pin (see the Applications Information section for details). GATE: Gate Drive for Internal N-channel MOSFET. An internal 24µA current source charges the gate of the N-channelMOSFET.Aresistorandcapacitornetworkfrom this pin sets the turn-on rate. During an undervoltage or overvoltage condition a 250µA pull-down current turns the MOSFET off. During a short-circuit or undervoltage lockout condition, a 140mA pull-down current source between GATE and OUT is activated. GND: Device Ground. IMON: Current Monitor Output. The current in the internal MOSFETswitchisdividedby50,000andsourcedfromthis pin. Placing a 20k resistor from this pin to GND creates a 0Vto2Vvoltageswingwhencurrentrangesfrom0Ato5A. INTVCC: Internal 3.1V Supply Decoupling Output. This pin must have a 1µF or larger bypass capacitor. ISET:CurrentLimitAdjustmentPin.Fora5.6Acurrentlimit value open this pin. This pin is driven by a 20k resistor in series with a voltage source. The pin voltage is used to generate the current limit threshold. The internal 20k resistor and an external resistor between ISET and ground create an attenuator that lowers the current limit value. Due to circuit tolerance the ISET resistor should not be less than 2k. In order to match the temperature variation of the sense resistor, the voltage on this pin increases at the same rate as the sense resistance increases. Therefore the voltage at ISET pin is proportional to temperature of the MOSFET switch. OUT: Output of Internal MOSFET Switch. Connect this pin directly to the load. OV: Overvoltage Comparator Input. Connect this pin to an external resistive divider from VDD. If the voltage at this pin rises above 1.235V, an overvoltage is detected and the switch turns off. Tie to GND if unused. PG: Power Good Indicator. Open-drain output pulls low when the FB pin drops below 1.21V indicating the power is bad. If the FB pin rises above 1.23V and the GATE to OUT voltage exceeds 4.2V, the open-drain pull-down releases the PG pin to go high. SENSE: Current Sense Node and MOSFET Drain. The cur- rent limit circuit controls the GATE pin to limit the sense voltage between the VDD and SENSE pins to 42mV (5.6A) orlessdependingonthevoltageattheFBpin.Theexposed pad on DHC packages are connected to SENSE and must be soldered to an electrically isolated printed circuit board trace to properly transfer the heat out of the package. TIMER: Timer Input. Connect a capacitor between this pin and ground to set a 12ms/µF duration for current limit before the switch is turned off. If the UV pin is toggled low while the MOSFET switch is off, the switch will turn on againfollowingacooldowntimeof518ms/µFduration.Tie this pin to INTVCC for a fixed 2ms overcurrent delay. Note that the fixed 2ms overcurrent delay is not recommended whenauto-retryisenabled(seeApplicationsInformation). UV: Undervoltage Comparator Input. Tie high if unused. Connect this pin to an external resistive divider from VDD. If the UV pin voltage falls below 1.15V, an undervoltage is detected and the switch turns off. Pulling this pin below 0.62V resets the overcurrent fault and allows the switch to turn back on (see the Applications Information section for details). If overcurrent auto-retry is desired then tie this pin to the FLT pin. VDD: Supply Voltage and Current Sense Input. This pin has an undervoltage lockout threshold of 2.73V. |
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