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LTC3405A-1.5 Datasheet(PDF) 5 Page - Linear Technology |
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LTC3405A-1.5 Datasheet(HTML) 5 Page - Linear Technology |
5 / 16 page 5 LTC3405A-1.5/LTC3405A-1.8 3405a1518fa PI FU CTIO S RUN (Pin 1): Run Control Input. Forcing this pin above 1.5V enables the part. Forcing this pin below 0.3V shuts down the device. In shutdown, all functions are disabled drawing <1µA supply current. Do not leave RUN floating. GND (Pin 2): Ground Pin. SW (Pin 3): Switch Node Connection to Inductor. This pin connects to the drains of the internal main and synchro- nous power MOSFET switches. VIN (Pin 4): Main Supply Pin. Must be closely decoupled to GND, Pin 2, with a 2.2µF or greater ceramic capacitor. VOUT (Pin 5): Output Voltage Feedback Pin. An internal resistive divider divides the output voltage down for com- parison to the internal 1.2V reference voltage. MODE (Pin 6): Mode Select Input. To select pulse skip- ping mode, tie to VIN. Grounding this pin selects Burst Mode operation. Do not leave this pin floating. 3405A1518 G20 VOUT 100mV/DIV AC COUPLED ILOAD 200mA/DIV IL 200mA/DIV 40µs/DIV VIN = 3.6V VOUT = 1.8V ILOAD = 20mA TO 250mA PULSE SKIPPING MODE VOUT 100mV/DIV AC COUPLED ILOAD 200mA/DIV IL 200mA/DIV 3405A1518 G21 40µs/DIV VIN = 3.6V VOUT = 1.8V ILOAD = 20mA TO 250mA Burst Mode OPERATION 3405A1518 G22 40µs/DIV VIN = 3.6V VOUT = 1.8V ILOAD = 0mA TO 250mA Burst Mode OPERATION VOUT 100mV/DIV AC COUPLED ILOAD 200mA/DIV IL 200mA/DIV TYPICAL PERFOR A CE CHARACTERISTICS Load Step Load Step Load Step (From Figure 1a) |
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