LTC3624_15 Datasheet, PDF (7/20 Pages) Linear Technology – 17V, 2A Synchronous Step-Down Regulator with 3.5A Quiescent Current

LTC3624/LTC3624-2
Pin Functions (DFN/MSOP)
SW (Pin 1/Pins 1, 2): Switch Node Connection to the
Inductor of the Step-Down Regulator.
V_IN (Pin 2/Pins 3, 4): Input Voltage of the Step-Down
Regulator.
RUN (Pin 3/Pin 5): Logic Controlled RUN Input. Do not
leave this pin floating. Logic high activates the step-down
regulator.
PGOOD (Pin 4/Pin 6): V_OUT within Regulation Indicator.
FB (Pin 5/Pin 8): Feedback Input to the Error Amplifier
of the Step-Down Regulator. Connect a resistor divider
tap to this pin. The output voltage can be adjusted from
0.6V to V_IN by:
V_OUT = 0.6V • [1 + (R2/R1)]
See Figure 1.
For fixed V_OUT options, connect the FB pin directly to V_OUT.
INTV_CC (Pin 6/Pin 9): Low Dropout Regulator. Bypass with
at least 2.2µF to Ground.
MODE/SYNC (Pin 7/Pin 10): Burst Mode Select and Ex-
ternal Clock Synchronization of the Step-Down Regulator.
Tie MODE/SYNC to INTV_CC for Burst Mode operation with
a 800mA peak current clamp, tie MODE/SYNC to GND for
pulse skipping operation, and tie MODE/SYNC to a volt-
age between 1V and V_INTVCC – 1.2V for forced continuous
mode. Furthermore, connecting MODE/SYNC to an external
clock will sync the system clock to the external clock and
put the part in forced continuous mode.
GND (Pin 8, Exposed Pad Pin 9/Pins 11, 12, Exposed
Pad Pin 13): Power and Signal Ground. The exposed pad
must be soldered to PCB ground for electrical and rated
thermal performance.
NC (Pin 7, MSOP Only): No Connect. There is no electrical
connection to this pin inside the package.
For more information www.linear.com/LTC3624
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