LM5069MM-2/NOPB

LM5069MM-2/NOPB Features

■ Wide operating range: +9V to +80V■ In-rush current limit for safe board insertion into live powersources■ Programmable maximum power dissipation in the externalpass device

LM5069MM-2/NOPB General Description

The LM5069 positive hot swap controller provides intelligentcontrol of the power supply connections during insertion andremoval of circuit cards from a live system backplane or other"hot" power sources. The LM5069 provides in-rush currentcontrol to limit system voltage droop and transients. The cur-rent limit and power dissipation in the external series pass N-Channel MOSFET are programmable, ensuring operationwithin the Safe Operating Area (SOA). The POWER GOODoutput indicates when the output voltage is within 1.25V of theinput voltage. The input under-voltage and over-voltage lock-out levels and hysteresis are programmable, as well as theinitial insertion delay time and fault detection time. TheLM5069-1 latches off after a fault detection, while theLM5069-2 automatically restarts at a fixed duty cycle. TheLM5069 is available in a 10 pin MSOP package.■ Adjustable current limit■ Circuit breaker function for severe over-current events■ Internal high side charge pump and gate driver for external■ Adjustable under-voltage lockout (UVLO) and hysteresis■ Adjustable over-voltage lockout (OVLO) and hysteresis■ Initial insertion timer allows ringing and transients to■ Programmable fault timer avoids nuisance trips■ Active high open drain POWER GOOD output■ Available in latched fault and automatic restart versionssubside after system connectionN-channel MOSFET

LM5069MM-2/NOPB Applications

■ Server Backplane Systems■ Base Station Power Distribution Systems■ Solid State Circuit Breaker■ 24V/48V Industrial Systems

LM5069MM-2/NOPB Pin Descriptions

Pin #NameDescriptionSENSECurrent sense inputVINPositive supply inputMSOP-10MUB10A1000 Units on Tape and Reel3500 Units on Tape and Reel1000 Units on Tape and Reel3500 Units on Tape and ReelApplications InformationThe voltage across the current sense resistor (RS) is measured from VIN to thispin. If the voltage across RS reaches 55mV the load current is limited and the faulttimer activates.A small ceramic bypass capacitor close to this pin is recommended to suppresstransients which occur when the load current is switched off.UVLOUnder-voltage lockout An external resistor divider from the system input voltage sets the under-voltageOVLOOver-voltage lockoutGNDTIMERCircuit groundTiming capacitorPWRPower limit setturn-on threshold. An internal 21 µA current source provides hysteresis. Theenable threshold at the pin is 2.5V. This pin can also be used for remote shutdowncontrol.An external resistor divider from the system input voltage sets the over-voltageturn-off threshold. An internal 21 µA current source provides hysteresis. Thedisable threshold at the pin is 2.5V.An external capacitor connected to this pin sets the insertion time delay and theFault Timeout Period. The capacitor also sets the restart timing of the LM5069-2.An external resistor connected to this pin, in conjunction with the current senseresistor (RS), sets the maximum power dissipation allowed in the external seriespass MOSFET.PGDPower Good indicator An open drain output. When the external MOSFET VDS decreases below 1.25V,OUTOutput feedback10GATEGate drive outputthe PGD indicator is active (high). When the external MOSFET VDS increasesabove 2.5V the PGD indicator switches low.Connect to the output rail (external MOSFET source). Internally used to determinethe MOSFET VDS voltage for power limiting, and to control the PGD indicator.Connect to the external MOSFET’s gate. This pin's voltage is typically 12V abovethe OUT pin when enabled.123456789www.national.com2