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LTC3404IMS8 Datasheet(PDF) 6 Page - Linear Technology |
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LTC3404IMS8 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 16 page  6 LTC3404 3404fb RUN (Pin 1): Run Control Input. Forcing this pin below 0.4V shuts down the LTC3404. In shutdown all functions are disabled drawing < 1 μA supply current. Forcing this pin above 1.2V enables the LTC3404. Do not leave RUN floating. ITH (Pin 2): Error Amplifier Compensation Point. The current comparator threshold increases with this control voltage. Nominal voltage range for this pin is from 0.5V to 1.9V. VFB (Pin 3): Feedback Pin. Receives the feedback voltage from an external resistive divider across the output. GND (Pin 4): Ground Pin. SW (Pin 5): Switch Node Connection to Inductor. This pin connects to the drains of the internal main and synchro- nous power MOSFET switches. VIN (Pin 6): Main Supply Pin. Must be closely decoupled to GND, Pin 4. SYNC/MODE (Pin 7): External Clock Synchronization and Mode Select Input. To synchronize with an external clock, apply a clock with a frequency between 1MHz and 1.7MHz. To select Burst Mode operation, tie to VIN. Grounding this pin selects pulse skipping mode. Do not leave this pin floating. PLL LPF (Pin 8): Output of the Phase Detector and Control Input of Oscillator. Connect a series RC lowpass network from this pin to ground if externally synchronized. If unused, this pin may be left open. PI FU CTIO S Load Step Response Load Step Response Load Step Response 40 μs/DIV VIN = 3.6V VOUT = 1.5V L = 4.7 μH CIN = 10μF COUT = 22μF ILOAD = 200mA TO 500mA PULSE SKIPPING MODE VOUT 100mV/DIV IL 500mA/DIV ITH 1V/DIV 3404 G17 40 μs/DIV VIN = 3.6V VOUT = 1.5V L = 4.7 μH CIN = 10μF COUT = 22μF ILOAD = 50mA TO 500mA PULSE SKIPPING MODE VOUT 100mV/DIV IL 500mA/DIV ITH 1V/DIV 3404 G18 40 μs/DIV VIN = 3.6V VOUT = 1.5V L = 4.7 μH CIN = 10μF COUT = 22μF ILOAD = 50mA TO 500mA Burst Mode OPERATION VOUT 100mV/DIV IL 500mA/DIV ITH 1V/DIV 3404 G19 TYPICAL PERFOR A CE CHARACTERISTICS |
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