LTC3419 Datasheet, PDF (6/16 Pages) Linear Technology – Dual Monolithic 600mA Synchronous Step-Down Regulator

LTC3419
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, V_IN = 3.6V, unless otherwise noted.
Load Step
V_OUT
100mV/DIV
AC-COUPLED
I_L
500mA/DIV
I_LOAD
500mA/DIV
20μs/DIV
V_IN = 3.6V
V_OUT = 1.8V
I_LOAD = 0A TO 600mA
Load Step
V_OUT
100mV/DIV
AC-COUPLED
I_L
500mA/DIV
I_LOAD
500mA/DIV
3419 G19
20μs/DIV
V_IN = 3.6V
V_OUT = 1.8V
I_LOAD = 40mA TO 600mA
Load Step
V_OUT
100mV/DIV
AC-COUPLED
I_L
500mA/DIV
I_LOAD
500mA/DIV
3419 G20
20μs/DIV
V_IN = 3.6V
V_OUT = 1.2V
I_LOAD = 40mA TO 600mA
3419 G21
PIN FUNCTIONS (DD/MS)
V_FB1 (Pin 1/Pin 1): Regulator 1 Output Feedback. Receives
the feedback voltage from the external resistive divider
across the regulator 1 output. Nominal voltage for this
pin is 0.6V.
RUN1 (Pin 2/Pin 2): Regulator 1 Enable. Forcing this pin
to V_IN enables regulator 1, while forcing it to GND causes
regulator 1 to shut down.
MODE (Pin 3/Pin 3): Mode Select Input. To select pulse-
skipping mode, tie to V_IN. Grounding this pin selects Burst
Mode operation. Do not leave this pin floating.
SW1 (Pin 4/Pin 4): Regulator 1 Switch Node Connection
to the Inductor. This pin swings from V_IN to GND.
V_IN (Pin 5/Pin 7): Main Power Supply. Must be closely
de-coupled to GND.
SW2 (Pin 6/Pin 8): Regulator 2 Switch Node Connection
to the Inductor. This pin swings from V_IN to GND.
RUN2 (Pin 7/Pin 9): Regulator 2 Enable. Forcing this pin
to V_IN enables regulator 2, while forcing it to GND causes
regulator 2 to shut down.
V_FB2 (Pin 8/Pin 10): Regulator 2 Output Feedback. Re-
ceives the feedback voltage from the external resistive
divider across the regulator 2 output. Nominal voltage
for this pin is 0.6V.
Exposed Pad (Pin 9/NA): Ground. The Exposed Pad must
be soldered to PCB for optimal thermal performance.
GND (NA/Pins 5, 6): Ground. Connect to the (–) terminal
of C_OUT, and the (–) terminal of C_IN. Pin 5 of the MS pack-
age must be soldered to the PC board for optimal thermal
performance.
3419f
6