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LTM4633 Datenblatt(PDF) 10 Page - Linear Technology

Teilenummer LTM4633
Bauteilbeschribung  Triple 10A Step-DownDC/DC 關Module Regulator
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Hersteller  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

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LTM4633
10
4633f
For more information www.linear.com/LTM4633
operaTion
Power Module Description
The LTM4633 µModule regulator is a high performance
triple output nonisolated switching mode DC/DC power
supply. It can provide 10A per output with a few exter-
nal input and output capacitors. This module provides
precisely regulated output voltages programmable via
external resistors from 0.8V DC to 1.8V DC (VOUT1 and
VOUT2), and 0.8V DC to 5.5V DC (VOUT3) over a 2.375V
to 16V input range with control bias on the CNTL_PWR
pin, or 4.7V to 16V with control bias tied to VIN. When
applying control bias in the range from 4.7V to 5.5V, then
connect the bias to CNTL_PWR and INVTCC, otherwise
if >5.5V only bias the CNTL_PWR pin. The typical applica-
tion schematic is shown in Figure 16.
The LTM4633 has three integrated constant-frequency
current mode regulators, power MOSFETs, power induc-
tors, and other supporting discrete components. The
typical switching frequency is 750kHz. For switching
noise-sensitive applications, it can be externally syn-
chronized from 600kHz to 750kHz. See the Applications
Information section.
With current mode control and internal feedback loop
compensation, the LTM4633 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 overvolt-
age monitor protects the output voltages in the event
of an overvoltage >7.5%. The top MOSFET is turned off
and the bottom MOSFET is turned on until the output
overvoltage is cleared. There are two temperature moni-
tors in the LTM4633. TEMP1 monitors the close relative
temperature of channels 1 and 2, and TEMP2 monitors
the close relative temperature of channels 2 and 3. The
two diode connected PNP transistors are grounded in the
module and can be used as general purpose temperature
monitors using a device that is designed to monitor the
single-ended connection.
Pulling any of the RUN pins below 1.3V forces the cor-
responding regulator channel into a shutdown state. The
TK/SS pins are used for programming the output voltage
ramp and voltage tracking during start-up for each of the
channels. See the Applications Information section.
TheLTM4633isinternallycompensatedtobestableoverall
operatingconditions.Table5providesaguidelineforinput
and output capacitances for several operating conditions.
The LTpowerCAD™ software tool is provided for transient
and stability analysis. The VFB pin is used to program the
output voltage with a single external resistor to ground.
Each of the channels, operate with a 120° phase shift for
multiphase operation. VOUT1 and VOUT2 can be combined
to provide a single 20A output. The two channels will
not be operating 180° phase shift, but 120° phase when
combined for a 20A design. So the input RMS current
will be higher than a 180° phase shifted design. See the
Applications Information section.
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 op-
erationintheTypicalPerformanceCharacteristicssection.


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