Datasheet LTM4619 (Analog Devices)

LTM4619 Dual, 26VIN, 4A DC/DC µModule Regulator
FeaTures DescripTion
n
Complete Standalone Power Supply
The LTM®4619 is a complete dual 4A or single 8A step- n
Wide Input Voltage Range: 4.5V to 26.5V
down DC/DC µModule® (micromodule) regulator. Included
(EXTVCC Available for VIN ≤ 5.5V)
in the package are the switching controller, power FETs, n
Dual 180° Out-of-Phase Outputs with 4A DC
inductor, and all support components. Operating over
Typical, 5A Peak Output Current for Each
input voltage ranges of 4.5V to 26.5V, the LTM4619 sup- n
Dual Outputs with 0.8V to 5V Range
ports two outputs with voltage ranges of 0.8V to 5V, each n
Output Voltage Tracking
set by a single external resistor. Its high efficiency design n
±1.5% Maximum Total DC Output Error
delivers 4A continuous current (5A peak) for each output. n
Current Mode Control/Fast Transient Response
High switching frequency and a current mode architecture n
Power Good
enable a very fast transient response to line and load n
Phase-Lockable Fixed Frequency 250kHz to 780kHz
changes without sacrificing stability. The two outputs n
On Board Frequency Synchronization
are interleaved with 180° phase to minimize the ripple n
Parallel Current Sharing
noise and reduce the I/O capacitors. The device supports n
Selectable Burst Mode
®
Operation
frequency synchronization and output voltage tracking for n Output Overvoltage Protection supply rail sequencing. Burst Mode operation or pulse- n 15mm × 15mm × 2.82mm LGA Package skipping mode can be selected for light load operations. Fault protection features include overvoltage protection,
applicaTions
overcurrent protection and foldback current limit for n short-circuit protection. Telecom and Networking Equipment n Servers The low profile package (2.82mm) enables utilization of n Storage Cards unused space on the bottom of PC boards for high density n ATCA Cards point of load regulation. The power module is offered in n Industrial Equipment a 15mm × 15mm × 2.82mm LGA package. The LTM4619 n Point of Load Regulation is RoHS compliant with Pb-free finish. 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.
Typical applicaTion Dual 4A 3.3V/2.5V DC/DC µModule Regulator Efficiency and Power Loss at 12V input
95 2.0 MODE/PLLIN INTV 90 EFFICIENCY CC 5.5V TO 26.5V VIN FREQ/PLLFLTR 10µF 28k 19.1k 85 1.5 ×2 POWER LOSS (W) VFB1 VFB2 80 22pF COMP1 COMP2 22pF VOUT1 75 1.0 V VOUT2 OUT1 LTM4619 VOUT2 2.5V/4A 3.3V/4A 100µF TK/SS1 TK/SS2 100µF EFFICIENCY (%) 70 POWER LOSS 0.1µF RUN1 RUN2 0.1µF 65 0.5 PGOOD EXTVCC 60 2.5VOUT SGND PGND 3.3VOUT 55 0 4619 TA01a 0 0.5 1 1.5 2 2.5 3 3.5 4 LOAD CURRENT (A) 4619 TA01b 4619fc For more information www.linear.com/LTM4619 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Revision History Package Photograph Related Parts Design Resources