LTM4614IV#PBF Linear Technology, LTM4614IV#PBF Datasheet - Page 8

• Manufacturer Part Number: LTM4614IV#PBF
• Description: IC UMODULE DC/DC DUAL 4A 144LGA
• Manufacturer: Linear Technology
• Series: µModuler
• Type: Point of Load (POL) Non-Isolatedr

Specifications of LTM4614IV#PBF

• Design Resources: LTM4614 Spice Model
• Output: 0.8 ~ 5 V
• Number Of Outputs: 2
• Power (watts): 12W
• Mounting Type: Surface Mount
• Voltage - Input: 2.38 ~ 5.5 V
• Package / Case: 144-LGA
• 1st Output: 0.8 ~ 5 VDC @ 4A
• 2nd Output: 0.8 ~ 5 VDC @ 4A
• Size / Dimension: 0.59" L x 0.59" W x 0.11" H (15mm x 15mm x 2.8mm)
• Power (watts) - Rated: 12W
• Operating Temperature: -40°C ~ 125°C
• Efficiency: 95%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• 3rd Output: -

OPERATION
LTM4614
LTM4614 POWER MODULE DESCRIPTION
The LTM4614 is a standalone dual nonisolated switching
mode DC/DC power supply. It can deliver up to 4A of DC
output current for each channel with few external input
and output capacitors. This module provides two precisely
regulated output voltages programmable via one external
resistor for each channel from 0.8V DC to 5V DC over
a 2.375V to 5.5V input voltage. The typical application
schematic is shown in Figure 12.
The LTM4614 has two integrated constant frequency cur-
rent mode regulators, with built-in power MOSFETs with
fast switching speed. The typical switching frequency is
1.25MHz. With current mode control and internal feedback
loop compensation, these switching regulators have suf-
fi cient stability margins and good transient performance
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 cur-
rent limit. Besides, current limiting is provided in an
overcurrent condition with thermal shutdown. In addition,
internal overvoltage and undervoltage comparators pull the
8
open-drain PGOOD outputs low if the particular output
feedback voltage exits a ±7.5% window around the regu-
lation 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, or current limit is exceeded.
Pulling each specifi c RUN pin below 0.8V forces the spe-
cifi c regulator controller into its shutdown state, turning
off both M1 and M2 for each power stage. At low load
current, each regulator works in continuous current mode
by default to achieve minimum output voltage ripple.
The TRACK/SS pins are used for power supply tracking
and soft-start programming for each specifi c regulator.
See Applications Information section.
The LTM4614 is internally compensated to be stable over
the operating conditions. Table 4 provides a guideline for
input and output capacitance for several operating condi-
tions. The Linear Technology μModule Power Design Tool
will be provided for transient and stability analysis.
The FB pins are used to program the specifi c output volt-
age with a single resistor to ground.
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