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Linear Technology - Dual 26VIN 4A DC/DC uModule Regulator

Numéro de référence LTM4619
Description Dual 26VIN 4A DC/DC uModule Regulator
Fabricant Linear Technology 
Logo Linear Technology 





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LTM4619 fiche technique
FEATURES
n Complete Standalone Power Supply
n Wide Input Voltage Range: 4.5V to 26.5V
(EXTVCC Available for VIN ≤ 5.5V)
n Dual 180° Out-of-Phase Outputs with 4A DC
Typical, 5A Peak Output Current for Each
n Dual Outputs with 0.8V to 5V VOUT Range
n Output Voltage Tracking
n ±1.5% Total DC Output Error
n Current Mode Control/Fast Transient Response
n Power Good
n Phase-Lockable Fixed Frequency 250kHz to 780kHz
n On Board Frequency Synchronization
n Parallel Current Sharing
n Selectable Burst Mode® Operation
n Output Overvoltage Protection
n Small Surface Mount Footprint, Low Profile
(15mm × 15mm × 2.8mm) LGA Package
APPLICATIONS
n Telecom and Networking Equipment
n Servers
n Storage Cards
n ATCA Cards
n Industrial Equipment
n Point of Load Regulation
L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and μModule are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
LTM4619www.DataSheet4U.com
Dual, 26VIN, 4A DC/DC
µModule Regulator
DESCRIPTION
The LTM®4619 is a complete dual 4A step-down switch-
ing mode DC/DC power supply. Included in the package
are the switching controller, power FETs, inductor, and all
support components. Operating over input voltage ranges
of 4.5V to 26.5V, the LTM4619 supports two outputs with
voltage ranges of 0.8V to 5V, each set by a single external
resistor. Its high efficiency design delivers 4A continuous
current (5A peak) for each output.
High switching frequency and a current mode architecture
enable a very fast transient response to line and load
changes without sacrificing stability. The two outputs are
interleaved with 180° phase to minimize the ripple noise and
reduce the I/O capacitors. The device supports frequency
synchronization and output voltage tracking for supply
rail sequencing. Burst Mode operation or pulse-skipping
mode can be selected for light load operations.
Fault protection features include overvoltage protection,
overcurrent protection and foldback current limit for
short-circuit protection.
The low profile package (2.8mm) enables utilization of
unused space on the bottom of PC boards for high density
point of load regulation. The power module is offered in a
space saving and thermally enhanced 15mm × 15mm ×
2.8mm LGA package. The LTM4619 is Pb-free and RoHS
compliant.
TYPICAL APPLICATION
Dual 4A 3.3V/2.5V DC/DC μModule® Regulator
5.5V TO 26.5V
VOUT1
2.5V/4A
10μF 28k
s2
MODE/PLLIN INTVCC
VIN FREQ/PLLFLTR
VFB1
VFB2
22pF COMP1
COMP2
100μF
VOUT1
TK/SS1
LTM4619
VOUT2
TK/SS2
0.1μF RUN1
RUN2
PGOOD
SGND
EXTVCC
PGND
4619 TA01a
19.1k
22pF
0.1μF
VOUT2
3.3V/4A
100μF
Efficiency and Power Loss at 12V input
95 2.0
90 EFFICIENCY
85 1.5
80
75 1.0
70
POWER LOSS
65 0.5
60 2.5VOUT
3.3VOUT
55 0
0 0.5 1 1.5 2 2.5 3 3.5 4
LOAD CURRENT (A)
4619 TA01b
4619f
1

PagesPages 24
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