LTC3406-1.2 Datasheet, PDF (5/12 Pages) Linear Technology – 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT

LTC3406-1.2
TYPICAL PERFOR A CE CHARACTERISTICS
(From Figure 1a Except for the Resistive Divider Resistor Values)
Load Step
Load Step
V_OUT
100mV/DIV
AC COUPLED
I_LOAD
500mA/DIV
I_L
500mA/DIV
20µs/DIV
V_IN = 3.6V
I_LOAD = 100mA TO 600mA
340612 G16
V_OUT
100mV/DIV
AC COUPLED
I_LOAD
500mA/DIV
I_L
500mA/DIV
20µs/DIV
V_IN = 3.6V
I_LOAD = 200mA TO 600mA
340612 G17
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.
V_IN (Pin 4): Main Supply Pin. Must be closely decoupled
to GND, Pin 2, with a 2.2µF or greater ceramic capacitor.
V_OUT (Pin 5): Output Voltage Feedback Pin. An internal
resistive divider divides the output voltage down for com-
parison to the internal reference voltage.
W
FU CTIO AL DIAGRA
SLOPE
COMP
OSC
OSC
V_OUT
5
FREQ
SHIFT
+
60k
0.8V
FB
– ^EA
120k
V_IN
–
OV
RUN
OVDET
1
0.8V REF ^{0.8V + ∆VOVL +}
SHUTDOWN
0.65V
I_COMP
SQ
RQ
RS LATCH
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
I_RCMP
4 VIN
5Ω
3 SW
2 GND
3406B12 BD
340612f
5