Datasheet LTC3405A-1.5, LTC3405A-1.8 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 1.8V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT |
| Pages / Page | 16 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS. (From Figure 1a). Load Step. PI FU … |
| File Format / Size | PDF / 209 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. (From Figure 1a). Load Step. PI FU CTIO S. RUN (Pin 1):. VIN (Pin 4):. OUT (Pin 5):
Model Line for this Datasheet
Text Version of Document
LTC3405A-1.5/LTC3405A-1.8
W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1a) Load Step Load Step Load Step
VOUT VOUT 100mV/DIV 100mV/DIV VOUT AC AC 100mV/DIV COUPLED COUPLED AC COUPLED I I L IL L 200mA/DIV 200mA/DIV 200mA/DIV ILOAD ILOAD ILOAD 200mA/DIV 200mA/DIV 200mA/DIV V 40 IN = 3.6V µs/DIV V 40 IN = 3.6V µs/DIV V 40 IN = 3.6V µs/DIV VOUT = 1.8V VOUT = 1.8V VOUT = 1.8V ILOAD = 20mA TO 250mA ILOAD = 20mA TO 250mA ILOAD = 0mA TO 250mA 3405A1518 G20 PULSE SKIPPING MODE 3405A1518 G21 Burst Mode OPERATION 3405A1518 G22 Burst Mode OPERATION
U U U PI FU CTIO S RUN (Pin 1):
Run Control Input. Forcing this pin above
VIN (Pin 4):
Main Supply Pin. Must be closely decoupled 1.5V enables the part. Forcing this pin below 0.3V shuts to GND, Pin 2, with a 2.2µF or greater ceramic capacitor. down the device. In shutdown, all functions are disabled
V
drawing <1µA supply current. Do not leave RUN floating.
OUT (Pin 5):
Output Voltage Feedback Pin. An internal resistive divider divides the output voltage down for com-
GND (Pin 2):
Ground Pin. parison to the internal 1.2V reference voltage.
SW (Pin 3):
Switch Node Connection to Inductor. This pin
MODE (Pin 6):
Mode Select Input. To select pulse skip- connects to the drains of the internal main and synchro- ping mode, tie to VIN. Grounding this pin selects Burst nous power MOSFET switches. Mode operation. Do not leave this pin floating. 3405a1518fa 5
W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1a) Load Step Load Step Load Step
VOUT VOUT 100mV/DIV 100mV/DIV VOUT AC AC 100mV/DIV COUPLED COUPLED AC COUPLED I I L IL L 200mA/DIV 200mA/DIV 200mA/DIV ILOAD ILOAD ILOAD 200mA/DIV 200mA/DIV 200mA/DIV V 40 IN = 3.6V µs/DIV V 40 IN = 3.6V µs/DIV V 40 IN = 3.6V µs/DIV VOUT = 1.8V VOUT = 1.8V VOUT = 1.8V ILOAD = 20mA TO 250mA ILOAD = 20mA TO 250mA ILOAD = 0mA TO 250mA 3405A1518 G20 PULSE SKIPPING MODE 3405A1518 G21 Burst Mode OPERATION 3405A1518 G22 Burst Mode OPERATION
U U U PI FU CTIO S RUN (Pin 1):
Run Control Input. Forcing this pin above
VIN (Pin 4):
Main Supply Pin. Must be closely decoupled 1.5V enables the part. Forcing this pin below 0.3V shuts to GND, Pin 2, with a 2.2µF or greater ceramic capacitor. down the device. In shutdown, all functions are disabled
V
drawing <1µA supply current. Do not leave RUN floating.
OUT (Pin 5):
Output Voltage Feedback Pin. An internal resistive divider divides the output voltage down for com-
GND (Pin 2):
Ground Pin. parison to the internal 1.2V reference voltage.
SW (Pin 3):
Switch Node Connection to Inductor. This pin
MODE (Pin 6):
Mode Select Input. To select pulse skip- connects to the drains of the internal main and synchro- ping mode, tie to VIN. Grounding this pin selects Burst nous power MOSFET switches. Mode operation. Do not leave this pin floating. 3405a1518fa 5
