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LTM4627

4627f

Power Module Description

The LTM4627 is a high performance single output stand-

alone nonisolated switching mode DC/DC power supply.

It can provide a 15A output with few external input and

output capacitors. This module provides precisely regulated

output voltages programmable via external resistors from

0.6VDC to 5VDC over a 4.5V to 20V input range. The typical

application schematic is shown in Figure 18.

The LTM4627 has an integrated constant-frequency current

mode regulator, power MOSFETs, 0.4μH inductor, and other

supporting discrete components. The switching frequency

range is from 400kHz to 800kHz, and the typical operating

frequency is 500kHz. For switching noise-sensitive appli-

cations, it can be externally synchronized from 400kHz to

800kHz. A single resistor is used to program the frequency.

See the Applications Information section.

With current mode control and internal feedback loop

compensation, the LTM4627 module has sufﬁcient stabil-

ity margins and good transient performance with a wide

range of output capacitors, even with all ceramic output

capacitors.

Current mode control provides cycle-by-cycle fast current

limit in an overcurrent condition. An internal overvoltage

monitor protects the output voltage in the event of an

OPERATION

overvoltage >10%. The top MOSFET is turned off and the

bottom MOSFET is turned on until the output is cleared.

Pulling the RUN pin below 1.1V forces the regulator into a

shutdown state. The TRACK/SS pin is used for program-

ming the output voltage ramp and voltage tracking during

start-up. See the Application Information section.

The LTM4627 is internally compensated to be stable over

all operating conditions. Table 4 provides a guideline for

input and output capacitances for several operating con-

ditions. The Linear Technology μModule Power Design

Tool will be provided for transient and stability analysis.

The VFB pin is used to program the output voltage with a

single external resistor to ground.

A remote sense ampliﬁer is provided for accurately sensing

output voltages ≤3.3V at the load point.

Multiphase operation can be easily employed with the

synchronization inputs using an external clock source.

See application examples.

High efﬁciency at light loads can be accomplished with

selectable Burst Mode operation using the MODE_PLLIN

pin. These light load features will accommodate battery

operation. Efﬁciency graphs are provided for light load

operation in the Typical Performance Characteristics

section.

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