LTM4619_15 Datasheet, PDF (1/26 Pages) Linear Technology – Dual, 26VIN, 4A DC/DC Module Regulator

Features
n _{Complete Standalone Power Supply}
n _{Wide Input Voltage Range: 4.5V to 26.5V}
(EXTV_CC Available for V_IN ≤ 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 Range}
n _{Output Voltage Tracking}
n _{±1.5% Maximum 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 _{15mm × 15mm × 2.82mm 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 and LTpowerCAD is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
LTM4619
Dual, 26V_IN, 4A DC/DC
µModule Regulator
Description
The LTM^®4619 is a complete dual 4A or single 8A step-
down DC/DC µModule^® (micromodule) regulator. 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 sup-
ports 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 (2.82mm) 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 15mm × 15mm × 2.82mm LGA package. The LTM4619
is RoHS compliant with Pb-free finish.
Typical Application
Dual 4A 3.3V/2.5V DC/DC µModule Regulator
5.5V TO 26.5V
V_OUT1
2.5V/4A
10µF 28k
×2
MODE/PLLIN INTV_CC
V_IN
FREQ/PLLFLTR
V_FB1
V_FB2
22pF COMP1
COMP2
100µF
V_OUT1
TK/SS1
LTM4619
V_OUT2
TK/SS2
0.1µF _RUN1
RUN2
PGOOD
SGND
EXTV_CC
PGND
4619 TA01a
19.1k
22pF
0.1µF
V_OUT2
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
2.5V_OUT
3.3V_OUT
55
0
0 0.5 1 1.5 2 2.5 3 3.5 4
LOAD CURRENT (A)
4619 TA01b
For more information www.linear.com/LTM4619
4619fc
1