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LTC3419

3419f

TYPICAL PERFORMANCE CHARACTERISTICS

Load Step

PIN FUNCTIONS

VFB1 (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 VIN 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 VIN. 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 VIN to GND.

VIN (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 VIN to GND.

RUN2 (Pin 7/Pin 9): Regulator 2 Enable. Forcing this pin

to VIN enables regulator 2, while forcing it to GND causes

regulator 2 to shut down.

VFB2 (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 COUT, and the (–) terminal of CIN. Pin 5 of the MS pack-

age must be soldered to the PC board for optimal thermal

performance.

(DD/MS)

VIN = 3.6V

VOUT = 1.8V

ILOAD = 0A TO 600mA

ILOAD

500mA/DIV

VOUT

100mV/DIV

AC-COUPLED

μs/DIV

3419 G19

VIN = 3.6V

VOUT = 1.8V

ILOAD = 40mA TO 600mA

ILOAD

500mA/DIV

VOUT

100mV/DIV

AC-COUPLED

μs/DIV

3419 G20

VIN = 3.6V

VOUT = 1.2V

ILOAD = 40mA TO 600mA

ILOAD

500mA/DIV

VOUT

100mV/DIV

AC-COUPLED

μs/DIV

3419 G21

TA = 25°C, VIN = 3.6V, unless otherwise noted.

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