LTC3406-1.2 Linear Technology, LTC3406-1.2 Datasheet - Page 5

• Manufacturer Part Number: LTC3406-1.2
• Description: 1.5MHz / 600mA Synchronous Step-Down Regulator in ThinSOT
• Manufacturer: Linear Technology

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