LTM4641 Datasheet, PDF (1/64 Pages) Linear Technology – 38V, 10A DC/DC Module Regulator with Advanced Input and Load Protection

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 _{Differential Remote Sense Amplifier for POL Regulation}
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}
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 RoHS compliant
BGA package with Pb-free 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.
TYPICAL APPLICATION
µModule Regulator with Input Disconnect and Fast Crowbar Output Overvoltage Protection
4
V_IN
4V TO 38V
4.5V START-UP
+
100µF
50V
MSP*
10µF
3
50V
×2
V_ING V_INGP V_{INH MTOP} SW
V_INL
V_OUT
2
750k
f_SET
UVLO
INTV_CC
DRV_CC
RUN
LTM4641
CROWBAR
M_BOT
V_OSNS+
V_OSNS–
GND
5.49k
5.49k
1
MCB**
V_OUT
1V
100µF ^10A
×3
LOAD
TRACK/SS
OV_PGM
10nF
IOVRETRY OVLO FCB LATCH SGND
5.6M
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
1V Load Protected from M_TOP
Short-Circuit at 38V_IN
SHORT-CIRCUIT APPLIED
4
V_INL, V_INH (25V/DIV)
3
CROWBAR (5V/DIV)
2
1.1V_OUT PEAK
V_OUT
(200mV/DIV)
4µs/DIV
TESTED AT WORST-CASE CONDITION: NO LOAD
1
4641 TA01b
4641f
1