Datasheet LTM4603, LTM4603-1 (Analog Devices)

LTM4603/LTM4603-1 20V, 6A DC/DC µModule Regulator with PLL, Output Tracking and Margining
Features Description
n
Complete Switch Mode Power Supply
The LTM®4603 is a complete 6A step-down switch mode n
Wide Input Voltage Range: 4.5V to 20V
DC/DC µModule® regulator with onboard switching con- n
6A DC Typical, 8A Peak Output Current
troller, MOSFETs, inductor and all support components. n
0.6V to 5V Output Voltage
The device is housed in a small surface mount 15mm × n
Output Voltage Tracking and Margining
15mm × 2.82mm LGA package. Operating over an input n
Remote Sensing for Precision Regulation (LTM4603
voltage range of 4.5V to 20V, the LTM4603 supports an
Only)
output voltage range of 0.6V to 5V as well as output volt- n
Typical Operating Frequency: 1MHz
age tracking and margining. The high efficiency design n
PLL Frequency Synchronization
delivers 6A continuous current (8A peak). Only bulk input n
1.5% Regulation
and output capacitors are needed to complete the design. n
Current Foldback Protection (Disabled at Start-Up)
The low profile (2.82mm) and light weight (1.7g) package n Pin Compatible with the LTM4601 easily mounts on the unused space on the back side of n Pb-Free (e4) RoHS Compliant Package with Gold PC boards for high density point of load regulation. The Finish Pads µModule regulator can be synchronized with an external n Ultrafast Transient Response clock for reducing undesirable frequency harmonics and n Current Mode Control allows PolyPhase® operation for high load currents. n Up to 93% Efficiency at 5VIN, 3.3VOUT n Programmable Soft-Start A high switching frequency and adaptive on-time current n Output Overvoltage Protection mode architecture deliver a very fast transient response n Small Footprint, Low Profile (15mm × 15mm × to line and load changes without sacrificing stability. An 2.82mm) Surface Mount LGA Package onboard remote sense amplifier can be used to accurately regulate an output voltage independent of load current.
applications
The onboard remote sense amplifier is not available in the LTM4603-1. The LTM4603/LTM4603-1 are pin compatible n Telecom and Networking Equipment with the 12A LTM4601/LTM4601-1. n Servers L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and PolyPhase are registered n Industrial Equipment trademarks and LTpowerCAD is a trademark of Linear Technology Corporation. All other n Point of Load Regulation trademarks are the property of their respective owners.
typical application Efficiency vs Load Current with 12VIN 1.5V/6A Power Supply with 4.5V to 20V Input
100 95 CLOCK SYNC VIN TRACK/SS CONTROL 90 4.5V TO 20V 85 VIN PLLIN TRACK/SS VOUT 80 PGOOD VOUT 1.5V 100pF 6A 75 VFB 70 ON/OFF RUN MARG0 MARGIN 65 COMP MARG1 CONTROL LTM4603 COUT 12V C EFFICIENCY (%) IN, 1.2VOUT IN 60 INTVCC VOUT_LCL 12VIN, 1.5VOUT 55 DRV 12VIN, 1.8VOUT CC DIFFVOUT 40.2k 12V MPGM V + 50 IN, 2.5VOUT OSNS 12VIN, 3.3VOUT V – 45 OSNS 12VIN, 5VOUT 392k SGND PGND fSET 40 0 1 2 3 4 5 6 7 5% MARGIN LOAD CURRENT (A) 4603 TA01a 4603 TA01b 4603fb 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 Application Package Description Revision History Typical Application Package Photograph Related Parts