LTM4606MPV datasheet(9/24 Pages) LINER

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LTM4606

4606f

OPERATION

Power Module Description

The LTM4606 is a standalone non-isolated switching mode

DC/DC power supply. It can deliver up to 6A of DC output

current with some external input and output capacitors.

This module provides precisely regulated output voltage

programmable via one external resistor from 0.6VDC to

5.0VDC over a 4.5V to 28V input voltage range. The typical

application schematic is shown in Figure 20.

The LTM4606 has an integrated constant on-time current

mode regulator, ultralow RDS(ON) FETs with fast switching

speed and integrated Schottky diodes. The typical switch-

ing frequency is 800kHz. With current mode control and

internal feedback loop compensation, the LTM4606 module

has sufﬁcient stability margins and good transient per-

formance under a wide range of operating conditions and

with a wide range of output capacitors, even all ceramic

output capacitors.

Current mode control provides cycle-by-cycle fast current

limiting. Besides, foldback current limiting is provided in an

overcurrent condition while VFBdrops.Internalovervoltage

and undervoltage comparators pull the open-drain PGOOD

output low if the output feedback voltage exits a ±10%

window around the regulation point. Furthermore, in an

overvoltage condition, internal top FET M1 is turned off

and bottom FET M2 is turned on and held on until the

overvoltage condition clears.

Input ﬁlter and noise cancellation circuits reduce the noise

coupling to I/O sides, and ensure the electromagnetic

interference (EMI) to meet the limits of CISPR 22 and

CISPR 25.

Pulling the RUN pin below 1V forces the controller into

its shutdown state, turning off both M1 and M2. At low

load currents, discontinuous mode (DCM) operation

can be enabled to achieve higher efﬁciency compared to

continuous mode (CCM) by setting the FCB pin higher

than 0.6V.

When the DRVCC pin is connected to INTVCC an integrated

5V linear regulator powers the internal gate drivers. If a

5V external bias supply is applied on the DRVCC pin, then

an efﬁciency improvement will occur due to the reduced

power loss in the internal linear regulator. This is especially

true at the higher input voltage range.

The MPGM, MARG0, and MARG1 pins are used to sup-

port voltage margining, where the percentage of margin

is programmed by the MPGM pin, and the MARG0 and

MARG1 selected margining. The PLLIN pin provides fre-

quency synchronization of the device to an external clock.

The TRACK/SS pin is used for power supply tracking and

soft-start programming.

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