LTM4613 datasheet(15/30 Pages) LINER

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LTM8003

8003fc

For more information www.linear.com/LTM8003

BLOCK DIAGRAM

PIN FUNCTIONS

BIAS

VOUT

VIN

GND

RUN

TR/SS

SYNC

8003 BD01

CURRENT

MODE

CONTROLLER

0.2µF

10pF

0.01µF

1.3µH

100k

BIAS

VOUT

VIN

GND

RUN

TR/SS

SYNC

8003 BD02

CURRENT

MODE

CONTROLLER

0.2µF

10pF

0.01µF

1.3µH

INTERNAL

0.97V

FEEDBACK

LTM8003 Block Diagram

LTM8003-3.3 Block Diagram

voltage. The PG signal is valid when VIN is above 3.4V. If

VIN is above 3.4V and RUN is low, PG will drive low. If this

function is not used, leave this pin floating.

FB(PinF1,F2):TheLTM8003regulatesitsFBpinto0.97V.

Connect the adjust resistor from this pin to ground. The

valueofRFBisgivenbytheequationRFB=97/(VOUT–0.97),

where RFB is in k.

TR/SS (Pin A3, B3): The TR/SS pin is used to provide a

soft-start or tracking function. The internal 2A pull-up

current in combination with an external capacitor tied to

this pin creates a voltage ramp. If TR/SS is less than 0.97V,

the output voltage tracks to this value. For tracking, tie a

resistor divider to this pin from the tracked output. This

pin is pulled to ground with an internal MOSFET during

shutdown and fault conditions; use a series resistor if

driving from a low impedance output. This pin may be left

floating if the tracking function is not needed.

NC (Pins C5, D5, E5, E6): These pins are not connected,

either to any other net or each other.

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