Document
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 overvoltage. 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 resistor 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 capacitors. 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.
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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) S.