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LTC3416

3416f

FU CTIO AL DIAGRA

–

ERROR

AMPLIFIER

0.74V

VFB

TRACK

SVIN

RUN/SS

PGOOD

RUN

0.86V

–

VOLTAGE

REFERENCE

SLOPE

COMPENSATION

OSCILLATOR

LOGIC

SLOPE

COMPENSATION

RECOVERY

PMOS CURRENT

COMPARATOR

NMOS CURRENT

COMPARATOR

SGND

EXPOSED

PAD

ITH

PGND

3416 FD

PVIN

OPERATIO

Main Control Loop

The LTC3416 is a monolithic, constant frequency, current

mode step-down DC/DC converter. During normal opera-

tion, the internal top power switch (P-channel MOSFET) is

turned on at the beginning of each clock cycle. Current in

the inductor increases until the current comparator trips

and turns off the top power MOSFET. The peak inductor

current at which the current comparator shuts off the top

power switch is controlled by the voltage on the ITH pin.

The error amplifier adjusts the voltage on the ITH pin by

comparing the feedback signal from a resistor divider on

the VFB pin with an internal 0.8V reference. When the load

current increases, it causes a reduction in the feedback

voltage relative to the reference. The error amplifier raises

the ITH voltage until the average inductor current matches

the new load current. When the top power MOSFET shuts

off, the synchronous power switch (N-channel MOSFET)

turns on until either the bottom current limit is reached or

the beginning of the next clock cycle. The bottom current

limit is set at –5A.

The operating frequency is externally set by an external

resistor connected between the RT pin and ground. The

practical switching frequency can range from 300kHz to

4MHz.

Overvoltage and undervoltage comparators will pull the

PGOOD output low if the output voltage comes out of

regulation by

±7.5%. In an overvoltage condition, the top

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