LTC3410B_15 Datasheet, PDF (6/16 Pages) Linear Technology – 2.25MHz, 300mA Synchronous Step-Down Regulator in SC70

LTC3410B
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 (Pins 2, 5): 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_FB (Pin 6 on Adjustable Version): Feedback Pin. Re-
ceives the feedback voltage from an external resistive
divider across the output.
V_OUT (Pin 6 on Fixed Voltage Versions): Output Voltage
Feedback Pin. An internal resistive divider divides the
output voltage down for comparison to the internal refer-
ence voltage.
W
FU CTIO AL DIAGRA
SLOPE
COMP
OSC
OSC
V_FB/VOUT
6
FREQ
SHIFT
+
R1*
0.8V
– ^EA
R2
240k
V_IN
RUN
1
0.8V REF
SHUTDOWN
( ) *R1 = 240k VOUT – 1
0.8
I_COMP
SQ
RQ
RS LATCH
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
I_RCMP
4 V_IN
5Ω
3 SW
5
2 GND
3410 BD
3410bfa
6