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LT3472

3472f

BLOCK DIAGRA

PI FU CTIO S

SWP (Pin 1): Switch Pin for Positive (Boost) Channel.

Connect boost inductor here.

VIN (Pin 2): Input Supply Pin. Must be locally bypassed

with a X5R or X7R type ceramic capacitor.

SHDN (Pin 3): Shutdown Pin. Connect to 0.8V or higher to

enable device, 0.3V or less to disable device.

SWN (Pin 4): Switch Pin for Negative (Inverter) Channel.

Connect inverter input inductor and flying capacitor here.

DN (Pin 5): Anode of Internal Schottky for Inverter.

Connect inverter output inductor and flying capacitor

here.

FBN (Pin 6): Feedback Pin for Inverter. Connect feedback

resistor R2 from this pin to VO2. Choose R2 according to

VO2 = 1.25 • R2/50k. Pin voltage = 0V when regulated.

SSN (Pin 7): Soft Start-Up Pin for Inverter. Connect a cap

here for soft start-up. Leave open for quick start-up. This

pin is connected to 1.25V with a 50k resistor internally.

FBP (Pin 8): Feedback Pin for Boost. Connect boost

feedback resistor R1 from this Pin to VO1. Choose R1

according to VO1 = 1.25 • (1 + R1/50k). Pin voltage = 1.25V

when regulated.

SSP (Pin 9): Soft Start-Up Pin for Boost. Connect a cap

here for soft start-up. Leave open for quick start-up. This

pin is connected to 1.25V with a 50k resistor internally.

VPOS (Pin 10): Output Pin for Boost. Connect boost output

capacitor here.

GND (Exposed Pad) (Pin 11): GND Pin. Tie directly to

ground plane through multiple vias under the package for

optimum thermal performance.

Figure 1. LT3472 Block Diagram

–

∑

COMPARATOR

50k

RAMP

GENERATOR

1.2MHz

OSCILLATOR

–

∑

COMPARATOR

RAMP

GENERATOR

DRIVER 1

DRIVER 2

SWN

SHDN

GND

SWP

VPOS

VREF

1.25V

FBP

VIN

FBN

50k

SSN

SSP

3472 BD

1.25V

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