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LTC4012IUF-3-PBF Datasheet(PDF) 9 Page - Linear Technology |
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LTC4012IUF-3-PBF Datasheet(HTML) 9 Page - Linear Technology |
9 / 28 page 40123fb LTC4012-3 pin FuncTions BGATE (Pin 16): External Synchronous NFET Gate Control Output.ThisoutputprovidesgatedrivetoanexternalNMOS powertransistorswitchusedforsynchronousrectification to increase efficiency in the step-down DC/DC converter. Operating voltage is GND to INTVDD. BGATE should be left floating if not used. INTVDD (Pin 17): Internal 5V Regulator Output. This pin provides a means of bypassing the internal 5V regulator used to power the LTC4012-3 PWM FET drivers. This sup- ply shuts down when the LTC4012-3 shuts down. Refer to the Application Information section for details if additional power is drawn from this pin by the application circuit. SW (Pin 18): PWM Switch Node. The LTC4012-3 uses the voltage on this pin as the source reference for its topside NFET (PWM switch) driver. Refer to the Applications In- formation section for additional PCB layout suggestions related to this critical circuit node. Operating voltage range is GND to CLN. TGATE(Pin19):ExternalNFETSwitchGateControlOutput. ThisoutputprovidesgatedrivetoanexternalNMOSpower transistor switch used in the DC/DC converter. Operating voltage range is GND to (CLN + 5V). BOOST (Pin 20): TGATE Driver Supply Input. A bootstrap capacitor is returned to this pin from a charge network connected to SW and INTVDD. Refer to the Applications Information section for complete details on circuit topol- ogyandcomponentvalues.Operatingvoltagerangesfrom (INTVDD – 1V) to (CLN + 5V). GND (Exposed Pad Pin 21): Ground. The package paddle provides a single-point ground for the internal voltage referenceandothercriticalLTC4012-3circuits.Itshouldbe soldered to a suitable PCB copper ground pad for proper electrical operation and to obtain the specified package thermal resistance. |
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