LTC3447 datasheet(6/16 Pages) LINER

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LTC3447

3447f

SW (Pin 6): Switch Node Connector to Inductor. This pin

connects the drains of the internal main and synchronous

power MOSFET switches.

RUN (Pin 7): Run Control Input. Forcing pin above 1.5V

enables the part. Forcing the pin below 0.3V shuts down

the device. In shutdown, all functions are disabled draw-

ing <1µA of supply current. Do not leave the RUN pin

ﬂoating.

SCL (Pin 8): I2C Clock Input.

VCCD (Pin 9): I

2C Power Rail.

SDA (Pin 10): I2C Data Input.

Exposed Pad (Pin 11): Ground. Must be connected to

PCB ground for electrical contact and optimized thermal

performance.

VOUT (Pin 1): Output Voltage Sensing Pin. An internal

resistor divider provides the divided down feedback refer-

ence for comparison.

GND (Pin 2): Ground for all Circuits Excluding the Internal

Synchronous Power NFET.

FB (Pin 3): Feedback Sensing Pin for the Optional External

Feedback Resistors. Must be tied to VIN if there are no

external feedback resistors.

PGOOD (Pin 4): Fault Report. Open drain driver sinks cur-

rent when VOUT is 10% out of tolerance. Blanking during

DAC changes can be enabled via the I2C.

VIN (Pin 5): Main Supply Pin. Must be closely decoupled

to GND with a 2.2µF or greater capacitor.

PI FU CTIO S

Figure 2. LTC3447 High Level Block Diagram

BLOCK DIAGRA

–

SLEW

SOFT-START

MUX

BUCK

REGULATOR

VFB

VREF

BURST

REF

UV REF

OV REF

POWER

GOOD

DAC

VDAC

LOAD

6-BIT DAC

I2C

BLANK

MUX

DAC

1.3R

VIN

RUN

VCCD

SDA

SCL

PGOOD

LTC3447

3447 BD

CIN

VOUT

COUT

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