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LTC4011 Datasheet(PDF) 7 Page - Linear Technology |
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LTC4011 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 24 page  7 LTC4011 4011p INTVDD (Pin 14): Internal 5V Regulator Output. This pin provides a means of bypassing the internal 5V regulator used to power the BGATE output driver. Typically, power should not be drawn from this pin by the application circuit. Refer to the Application Information section for additional details. BGATE (Pin 15): External Synchronous N-channel MOSFET Gate Control Output. This output provides gate drive to an optional external NMOS power transistor switch used for synchronous rectification to increase efficiency in the step-down DC/DC converter. Operating voltage is GND to INTVDD. BGATE should be left floating if not used. PGND (Pin 16): Power Ground. This pin provides a return for switching currents generated by internal LTC4011 circuits. Externally, PGND and GND should be wired together using a very low impedance connection. Refer to PCB Layout Considerations in the Applications Informa- tion section for additional grounding details. TGATE (Pin 17): External P-channel MOSFET Gate Control Output. This output provides gate drive to an external PMOS power transistor switch used in the DC/DC con- verter. Operating voltage range varies as a function of VCC. Refer to the Electrical Characteristics table for specific voltages. PI FU CTIO S VCC (Pin 18): Power Input. External PowerPath control circuits normally connect either the DC input power supply or the battery to this pin. Refer to the Applications Infor- mation section for further details. Suggested applied voltage range is GND to 34V. READY (Pin 19): Active-Low Ready-to-Charge Output. The LTC4011 connects this pin to GND if proper operating voltages for charging are present. Refer to the Operation section for complete details on charge qualification. This output is capable of driving an LED and should be left floating if not used. READY is an open-drain output to GND with an operating voltage range of GND to VCC. INFET (Pin 20): PowerPath Control Output. For very low dropout applications, this output may be used to drive the gate of an input PMOS pass transistor connected between the DC input (DCIN) and the raw system supply rail (VCC). INFET is internally clamped about 6V below VCC. Maxi- mum operating voltage is VCC. INFET should be left floating if not used. Exposed Pad (Pin 21): This pin provides enhanced thermal properties for the TSSOP. It must be soldered to the PCB copper ground to obtain optimum thermal performance. |
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Similar Description - LTC4011 |
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