LTC3370 datasheet(12/24 Pages) LINER

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LTC3370

3370fb

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pin FuncTions

the programmed output value for Bucks 2-4. When all

buck regulators are disabled PGOODALL is driven LOW.

EN3 (Pin 15): Buck Regulator 3 Enable Input. Active high.

In configurations where Buck 3 is not used, tie EN3 to

ground. Do not float.

FB3 (Pin 16): Buck Regulator 3 Feedback Pin. Receives

feedbackbyaresistordividerconnectedacrosstheoutput.

In configurations where Buck 3 is not used, FB3 should

be tied to ground.

VINE (Pin 17):Power Stage E Input Supply. Bypass to GND

with a 10µF or larger ceramic capacitor.

SWE (Pin 18): Power Stage E Switch Node. External

inductor connects to this pin.

SWF (Pin 19): Power Stage F Switch Node. External

inductor connects to this pin.

VINF (Pin 20): Power Stage F Input Supply. Bypass to GND

with a 10µF or larger ceramic capacitor.

VING (Pin 21): Power Stage G Input Supply. Bypass to

GND with a 10µF or larger ceramic capacitor.

SWG (Pin 22): Power Stage G Switch Node. External

inductor connects to this pin.

SWH (Pin 23): Power Stage H Switch Node. External

inductor connects to this pin.

VINH (Pin 24): Power Stage H Input Supply. Bypass to

GND with a 10µF or larger ceramic capacitor.

FB4 (PIN 25): Buck Regulator 4 Feedback Pin. Receives

feedbackbyaresistordividerconnectedacrosstheoutput.

EN4 (Pin 26): Buck Regulator 4 Enable Input. Active high.

Do not float.

RT (Pin 27): Oscillator Frequency Pin. This pin provides

two modes of setting the switching frequency. Connecting

a resistor from RT to ground sets the switching frequency

based on the resistor value. If RT is tied to VCC the internal

2MHz oscillator is used. Do not float.

PLL/MODE (Pin 28): Oscillator Synchronization and Buck

ModeSelectPin.DrivingPLL/MODEwithanexternalclock

signal synchronizes all switches to the applied frequency,

and the buck converters operate in forced continuous

mode. The slope compensation is automatically adapted

to the external clock frequency. The absence of an external

clock signal enables the frequency programmed by the

RT pin. When not synchronizing to an external clock this

input determines how the LTC3370 operates at light loads.

Pulling this pin to ground selects Burst Mode operation.

Tying this pin to VCC invokes forced continuous mode

operation. Do not float.

VCC (Pin 29): Internal Bias Supply. Bypass to GND with a

10µF or larger ceramic capacitor.

TEMP(Pin30):TemperatureIndicationPin.TEMPoutputs

a voltage of 220mV (typical) at 25°C. The TEMP voltage

increases by 7mV/°C (typical) at higher temperatures

giving an external indication of the LTC3370 internal die

temperature.

EN1 (Pin 31): Buck Regulator 1 Enable Input. Active high.

Do not float.

FB1 (Pin 32): Buck Regulator 1 Feedback Pin. Receives

feedbackbyaresistordividerconnectedacrosstheoutput.

GND (Exposed Pad Pin 33): Ground. The exposed pad

should be connected to a continuous ground plane on the

printed circuit board directly under the LTC3370.

LTC3370 Datasheet(PDF) 12 Page - Linear Technology

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