LTC3606B Datasheet, PDF (6/20 Pages) Linear Technology – 800mA Synchronous Step-Down DC/DC with Average Input Current Limit

LTC3606B
PIN FUNCTIONS
GND (Pins 1, 3, Exposed Pad Pin 9): Ground. Connect to
the (–) terminal of C_OUT, and the (–) terminal of C_IN. The
Exposed Pad must be soldered to PCB.
RLIM (Pin 2): Average Input Current Limit Program Pin.
Place a resistor and capacitor in parallel from this pin to
ground.
SW (Pin 4): Regulator Switch Node Connection to the
Inductor. This pin swings from V_IN to GND.
V_IN (Pin 5): Main Power Supply. Must be closely de-
coupled to GND.
PGOOD (Pin 6): Open-Drain Logic Output. PGOOD is pulled
to ground if the voltage on the V_FB pin is not within power
good threshold.
RUN (Pin 7): Regulator Enable. Forcing this pin to V_IN
enables regulator, while forcing it to GND causes regulator
to shut down.
V_FB (Pin 8): Regulator Output Feedback. Receives the
feedback voltage from the external resistive divider
across the regulator output. Nominal voltage for this pin
is 0.6V.
FUNCTIONAL DIAGRAM
RUN 7
0.6V REF
OSC
OSC
V_{FB 8}
PGOOD 6
–
– EA
+
0.6V
MIN
CLAMP
SLOPE
COMP
I_TH
–
SLEEP
V_SLEEP +
–+
I_COMP
SOFT-START
0.654V
V_FB
0.546V
S
Q
RS
LATCH
R
Q
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI
SHOOT-
THRU
SHUTDOWN
I_RCMP
6
2 RLIM
1V
5 V_IN
+
I_COMP
–
4 SW
9 GND
3606B FD
3606bfa