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,powerMOSFETs,inductor,overvoltagedrivers,biasing
circuitryandsupportingcomponents.Operatingfrominput
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.
FEATURES
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Wide Operating Input Voltage Range: 4.5V to 38V
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10A DC Typical, 12A Peak Output Current
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Output Range: 0.6V to 6V
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1.5ꢀ ꢁaꢂiꢃuꢃ Total Output DC Voltage Error
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DifferentialReꢃoteSenseAꢃplifierforPOLRegulation
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Internal Teꢃperature, Analog Indicator Output
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OvercurrentFoldbackandOverteꢃperatureProtection
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Current ꢁode Control/Fast Transient Response
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Parallelable for Higher Output Current
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Selectable Pulse-Skipping Operation
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Soft-Start/Voltage Tracking/Pre-Bias Start-Up
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15mm × 15mm × 5.01mm BGA Package
Input Protection
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UVLO, Overvoltage Shutdown and Latchoff Thresholds
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
controlarchitectureenableshighstep-downratiosandfast
responsetotransientlineandloadchanges. TheLTM4641
is offered in a 15mm × 15mm × 5.01mm RoHS compliant
BGA package with Pb-free finish.
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N-Channel Overvoltage Power-Interrupt MOSFET Driver
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Surge Stopper Capable with Few External Components
Load Protection
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Robust, Resettable Latchoff Overvoltage Protection
N-Channel Overvoltage Crowbar Power MOSFET Driver
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APPLICATIONS
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.
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Ruggedized Electronics
Avionics and Industrial Equipment
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TYPICAL APPLICATION
µꢁodule Regulator with Input Disconnect and Fast Crowbar Output Overvoltage Protection
4
1V Load Protected froꢃ ꢁTOP
Short-Circuit at 38VIN
V
MSP*
IN
4V TO 38V
4.5V START-UP
+
3
10µF
50V
×2
100µF
50V
SHORT-CIRCUIT APPLIED
1
V
V
V
V
SW
V
M
ING INGP INH
OUT
TOP
4
1V
V
2
INL
OUT
10A
V
, V (25V/DIV)
INL INH
100µF
3
2
×3
750k
CROWBAR (5V/DIV)
MCB**
CROWBAR
M
BOT
f
1.1V
OUT
PEAK
SET
5.49k
5.49k
+
–
UVLO
INTV
V
V
OSNS
LTM4641
CC
LOAD
DRV
CC
V
OUT
(200mV/DIV)
OSNS
RUN
GND
OV
4641 TA01a
1
TRACK/SS
PGM
5.6M
10nF
IOVRETRY OVLO FCB LATCH SGND
4641 TA01b
4µs/DIV
TESTED AT WORST-CASE CONDITION: NO LOAD
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
4641f
1
Linear [ Linear ]
