Datasheet LTC3406-1.2 (Analog Devices) - 5

LTC3406-1.2
W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1a Except for the Resistive Divider Resistor Values) Load Step Load Step
VOUT VOUT 100mV/DIV 100mV/DIV AC COUPLED AC COUPLED I I LOAD LOAD 500mA/DIV 500mA/DIV I I L L 500mA/DIV 500mA/DIV 340612 G17 20µs/DIV 340612 G16 20µs/DIV VIN = 3.6V VIN = 3.6V ILOAD = 100mA TO 600mA ILOAD = 200mA TO 600mA
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 reference voltage.
SW (Pin 3):
Switch Node Connection to Inductor. This pin connects to the drains of the internal main and synchro- nous power MOSFET switches.
U U W FU CTIO AL DIAGRA
SLOPE COMP OSC OSC 0.65V FREQ 4 VIN SHIFT – VOUT + 5 + 0.8V – + 5Ω 60k I FB – EA COMP 120k S Q R Q SWITCHING RS LATCH LOGIC ANTI- V AND IN SHOOT- – OV BLANKING THRU 3 SW RUN CIRCUIT OVDET 0.8V + ∆V + 1 OVL 0.8V REF + SHUTDOWN IRCMP– 2 GND 3406B12 BD 340612fa 5