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LTC3642IMS8E-3.3-TRPBF Datasheet(PDF) 6 Page - Linear Technology |
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LTC3642IMS8E-3.3-TRPBF Datasheet(HTML) 6 Page - Linear Technology |
6 / 20 page LTC3642 6 3642f PIN FUNCTIONS SW (Pin 1): Switch Node Connection to Inductor. This pin connects to the drains of the internal power MOSFET switches. VIN (Pin 2): Main Supply Pin. A ceramic bypass capacitor should be tied between this pin and GND (Pin 8). ISET (Pin 3): Peak Current Set Input. A resistor from this pin to ground sets the peak current trip threshold. Leave floating for the maximum peak current (115mA). Short this pin to ground for the minimum peak current (25mA). A 1μA current is sourced out of this pin. SS (Pin 4): Soft-Start Control Input. A capacitor to ground at this pin sets the ramp time to full current output dur- ing start-up. A 5μA current is sourced out of this pin. If left floating, the ramp time defaults to an internal 0.75ms soft-start. RUN (Pin 5): Run Control Input. A voltage on this pin above 1.2V enables normal operation. Forcing this pin below 0.7V shuts down the LTC3642, reducing quiescent current to approximately 3μA. VOUT/VFB (Pin 6): Output Voltage Feedback. For the fixed output versions, connect this pin to the output supply. For the adjustable version, an external resistive divider should be used to divide the output voltage down for comparison to the 0.8V reference. HYST (Pin 7): Run Hysteresis Open-Drain Logic Output. This pin is pulled to ground when RUN (Pin 5) is below 1.2V. This pin can be used to adjust the RUN pin hysteresis. See Applications Information. GND (Pin 8): Chip Ground. Exposed Pad (Pin 9): Ground. Must be soldered to PCB ground for optimal electrical and thermal performance. |
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