uModule Regulator. LTM4641 Datasheet

LTM4641 Regulator. Datasheet pdf. Equivalent


Part LTM4641
Description DC/DC uModule Regulator
Feature Features n Wide Operating Input Voltage Range: 4.5V to 38V n 10A DC Typical, 12A Peak Output Curren.
Manufacture Linear Technology
Datasheet
Download LTM4641 Datasheet


Features n Wide Operating Input Voltage Range: 4.5V to 38V LTM4641 Datasheet
Recommendation Recommendation Datasheet LTM4641 Datasheet




LTM4641
Features
n Wide Operating Input Voltage Range: 4.5V to 38V
n 10A DC Typical, 12A Peak Output Current
n Output Range: 0.6V to 6V
n ±1.5% Maximum Total Output DC Voltage Error
n DifferentialRemoteSenseAmplifierforPOLRegulation
n Internal Temperature, Analog Indicator Output
n Overcurrent Foldback and Overtemperature
Protection
n Current Mode Control/Fast Transient Response
n Parallelable for Higher Output Current
n Selectable Pulse-Skipping Operation
n Soft-Start/Voltage Tracking/Pre-Bias Start-Up
n 15mm × 15mm × 5.01mm BGA Package
n SnPb or RoHS Compliant Finish
Input Protection
n UVLO, Overvoltage Shutdown and Latchoff Thresholds
n N-Channel Overvoltage Power-Interrupt MOSFET Driver
n Surge Stopper Capable with Few External Components
Load Protection
n Robust, Resettable Latchoff Overvoltage Protection
n N-Channel Overvoltage Crowbar Power MOSFET Driver
Applications
n Ruggedized Electronics
n Avionics and Industrial Equipment
LTM4641
38V, 10A DC/DC µModule
Regulator with Advanced
Input and Load Protection
Description
The LTM®4641 is a switch mode step-down DC/DC
µModule® (micromodule) regulator with advanced input
and load protection features. Trip detection thresholds for
the following faults are customizable: input undervoltage,
overtemperature, input overvoltage and output overvolt-
age. Select fault conditions can be set for latchoff or
hysteretic restart response—or disabled. Included in the
package are the switching controller and housekeeping ICs,
power MOSFETs, inductor, overvoltage drivers, biasing
circuitry and supporting components. Operating from input
voltages of 4V to 38V (4.5V start-up), the device supports
output voltages from 0.6V to 6V, set by an external resis-
tor network remote sensing the point-of-load’s voltage.
The LTM4641’s high efficiency design can deliver up to
10A continuous current with a few input and output ca-
pacitors. The regulator’s constant on-time current mode
control architecture enables high step-down ratios and
fast response to transient line and load changes. The
LTM4641 is offered in a 15mm × 15mm × 5.01mm with
SnPb or RoHS compliant terminal finish.
L, LT, LTC, LTM, µModule, Burst Mode, Linear Technology and the Linear logo are registered
trademarks and LTpowerCAD is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
5481178, 5847554, 6100678, 6304066, 6580258, 6677210, 8163643.
Click to view associated TechClip Videos.
Typical Application
µModule Regulator with Input Disconnect and Fast Crowbar Output Overvoltage Protection
4
VIN
4V TO 38V
4.5V START-UP
+
100µF
50V
MSP*
10µF
50V
×2
VING VINGP VINH
3
MTOP
SW
VINL
VOUT
2
750k
fSET
UVLO
INTVCC
DRVCC
RUN
LTM4641
CROWBAR
MBOT
VOSNS+
VOSNS–
GND
5.49k
5.49k
TRACK/SS
OVPGM
10nF
IOVRETRY OVLO FCB LATCH SGND
5.6M
1
MCB**
VOUT
1V
100µF 10A
×3
LOAD
4641 TA01a
SGND CONNECTS TO GND INTERNAL TO µMODULE REGULATOR
*MSP: (OPTIONAL) SERIES-PASS OVERVOLTAGE POWER INTERRUPT MOSFET, NXP PSMN014-60LS
**MCB: (OPTIONAL) OUTPUT OVERVOLTAGE CROWBAR MOSFET, NXP PH2625L
For more information www.linear.com/LTM4641
1V LSohaodrtP-rCoitreccutiet datfr3o8mVIMN TOP
SHORT-CIRCUIT APPLIED
VINL, VINH (25V/DIV)
CROWBAR (5V/DIV)
1.1VOUT PEAK
4
3
2
VOUT
(200mV/DIV)
4µs/DIV
TESTED AT WORST-CASE CONDITION: NO LOAD
1
4641 TA01b
4641fe
1



LTM4641
LTM4641
Table of Contents
Features...................................................... 1
Applications................................................. 1
Typical Application ......................................... 1
Description.................................................. 1
Absolute Maximum Ratings............................... 3
Order Information........................................... 3
Pin Configuration........................................... 3
Electrical Characteristics.................................. 4
Typical Performance Characteristics.................... 8
Pin Functions............................................... 10
Simplified Block Diagram................................ 15
Decoupling Requirements................................ 15
Operation................................................... 16
Introduction............................................................. 16
Motivation................................................................ 16
Power µModule Regulator Reliability....................... 16
Overview.................................................................. 16
Applications Information—Power Supply Features.. 17
Power (VINH) and Bias (VINL) Input Pins.................. 17
Switching Frequency (On Time) Selection and
Voltage Dropout Criteria (Achievable VIN-to-VOUT
Step-Down Ratios).................................................. 18
Setting the Output Voltage; the Differential
Remote Sense Amplifier.......................................... 21
Input Capacitors......................................................23
Output Capacitors and
Loop Stability/Loop Compensation..........................23
Pulse-Skipping Mode vs
Forced Continuous Mode ........................................ 24
Soft-Start, Rail-Tracking and Start-Up Into
Pre-Bias................................................................... 24
INTVCC and DRVCC................................................................ 27
1VREF.......................................................................................... 28
TEMP, OTBH and Overtemperature Protection......... 28
Input Monitoring Pins: UVLO, IOVRETRY, OVLO.....29
Applications Information—Input Protection
Features..................................................... 29
Start-Up/Shutdown and Run Enable;
Power-On Reset and Timeout Delay Time................ 31
Applications Information—Load Protection
Features..................................................... 32
Overcurrent Foldback Protection............................. 32
Power Good Indicator and Latching Output
Overvoltage Protection............................................ 32
Power-Interrupt MOSFET (MSP), CROWBAR Pin
and Output CROWBAR MOSFET (MCB)...................33
Fast Output Overvoltage Comparator Threshold......34
The Switching Node: SW Pin...................................35
Applications Information—EMI Performance......... 35
Applications Information—Multimodule
Parallel Operation......................................... 36
Applications Information—Thermal Considerations
and Output Current Derating............................. 38
Thermal Considerations and
Output Current Derating..........................................38
Applications Information—Output Capacitance
Table......................................................... 45
Applications Information—Safety and Layout
Guidance.................................................... 46
Safety Considerations..............................................46
Layout Checklist/Example.......................................46
Typical Applications....................................... 48
Appendices................................................. 56
Appendix A. Functional Block Diagram and
Features Quick Reference Guide..............................56
Appendix B. Start-Up/Shutdown State Diagram...... 57
Appendix C. Switching Frequency Considerations
and Usage of RfSET..................................................58
Appendix D. Remote Sensing in
Harsh Environments................................................ 59
Appendix E. Inspiration For Pulse-Skipping
Mode Operation.......................................................60
Appendix F. Adjusting the Fast Output Overvoltage
Comparator Threshold.............................................60
Package Description...................................... 63
Package Photo............................................. 63
Package Description...................................... 64
Revision History........................................... 65
Typical Application........................................ 66
Related Parts............................................... 66
4641fe
2 For more information www.linear.com/LTM4641







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