Datasheet LTM4608A (Analog Devices)

LTM4608A Low VIN, 8A DC/DC µModule Regulator with Tracking, Margining, and Frequency Synchronization
FEATURES DESCRIPTION
n
Complete Standalone Power Supply
The LTM®4608A is a complete 8A switch mode DC/DC power n ±
1.75% Total DC Output Error (–55°C to 125°C)
supply with ±1.75% total output voltage error. Included n
2.7V to 5.5V Input Voltage Range
in the package are the switching controller, power FETs, n
8A DC, 10A Peak Output Current
inductor and all support components. Operating over an n
0.6V Up to 5V Output
input voltage range of 2.7V to 5.5V, the LTM4608A sup- n
Output Voltage Tracking and Margining
ports an output voltage range of 0.6V to 5V, set by a single n
Power Good Tracks Margining
external resistor. This high efficiency design delivers up n
Multiphase Operation
to 8A continuous current (10A peak). Only bulk input and n
Parallel Current Sharing
output capacitors are needed to complete the design. n
Onboard Frequency Synchronization
The low profile package (2.82mm) enables utilization n
Spread Spectrum Frequency Modulation
of unused space on the back side of PC boards for high n
Overcurrent/Thermal Shutdown Protection
density point-of-load regulation. The 0.630mm LGA pads n Current Mode Control/Fast Transient Response with 1.27mm pitch simplify PCB layout by providing stan- n Selectable Burst Mode® Operation dard trace routing and via placement. The high switching n Up to 95% Efficiency frequency and current mode architecture enable a very n Output Overvoltage Protection fast transient response to line and load changes without n 9mm × 15mm × 2.82mm LGA and sacrificing stability. The device supports frequency syn- 9mm × 15mm × 3.42mm BGA Packages chronization, programmable multiphase and/or spread spectrum operation, output voltage tracking for supply
APPLICATIONS
rail sequencing and voltage margining. n Telecom, Networking and Industrial Equipment Fault protection features include overvoltage protec- n Storage Systems tion, overcurrent protection and thermal shutdown. The n Point of Load Regulation LTM4608A is offered in 9mm × 15mm × 2.82mm LGA and L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, µModule and PolyPhase 9mm × 15mm × 3.42mm BGA packages. The LTM4608A is 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 available with SnPb (BGA) or RoHS compliant terminal finish. including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131.
TYPICAL APPLICATION Efficiency vs Load Current 2.7V to 5.5V Input to 1.8V Output DC/DC µModule
®
Regulator
100 VOUT = 1.8V CLKIN 95 VIN = 3.3V CLKIN VIN VOUT 90 VIN VOUT 2.7V TO 5.5V 1.8V VIN = 5V SV 10µF IN FB 100µF 85 SW ITH 4.87k RUN LTM4608A ITHM EFFICIENCY (%) 80 PLLLPF PGOOD PGOOD TRACK MGN 75 CLKOUT GND SGND 4608A TA01a 70 0 2 4 6 8 10 LOAD CURRENT (A) 4608A TA01b 4608afe For more information www.linear.com/LTM4608A 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Typical Performance Characteristics Pin Functions Simplified Block Diagram Operation Applications Information Typical Applications Package Description Package Photo Revision History Package Description Related Parts