Datasheet LTM4650 (Analog Devices)

LTM4650 Dual 25A or Single 50A DC/DC µModule Regulator
FEATURES DESCRIPTION
n
Dual 25A or Single 50A Output
The LTM®4650 is a dual 25A or single 50A output switch- n
Input Voltage Range: 4.5V to 15V
ing mode step-down DC/DC µModule® (power module) n
Output Voltage Range: 0.6V to 1.8V
regulator. Included in the package are the switching con- n
±1.5% Maximum Total DC Output Error Over Line,
trollers, power FETs, inductors, and all supporting com-
Load and Temperature
ponents. Operating from an input voltage range of 4.5V n
Differential Remote Sense Amplifier
to 15V, the LTM4650 supports two outputs each with an n
Current Mode Control/Fast Transient Response
output voltage range of 0.6V to 1.8V, each set by a single n
Adjustable Switching Frequency
external resistor. Its high efficiency design delivers up to n
Frequency Synchronization
25A continuous current for each output. Only a few input n
Overcurrent Foldback Protection
and output capacitors are needed. The LTM4650 is pin n
Multiphase Parallel Current Sharing with Multiple
compatible with the LTM4620 (dual 13A, single 26A) and
LTM4650s Up to 300A
the LTM4630 (dual 18A, single 36A). n
Internal Temperature Monitor
The device supports frequency synchronization, multi- n Pin Compatible with the LTM4620 (Dual 13A, Single phase operation, Burst Mode operation and output voltage 26A) and LTM4630 (Dual 18A, Single 36A) tracking for supply rail sequencing and has an onboard n Selectable Burst Mode® Operation temperature diode for device temperature monitoring. n Soft-Start/Voltage Tracking High switching frequency and a current mode architec- n Output Overvoltage Protection ture enable a very fast transient response to line and load n 16mm × 16mm × 5.01mm BGA Package changes without sacrificing stability. Fault protection features include overvoltage and
APPLICATIONS
overcurrent protection. The LTM4650 is offered in a n 16mm × 16mm × 5.01mm BGA package. Processor, ASIC and FPGA Core Power n Telecom and Networking Equipment All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066 n Storage and ATCA Cards and 6580258. Other patents pending. n Industrial Equipment
TYPICAL APPLICATION 50A, 1.2V Output DC/DC µModule Regulator 1.2VOUT Efficiency vs IOUT
95 VIN VIN VOUT1 fSW = 500KHz 4.5V TO 22µF 220µF 15V * 120k 25V CERAMIC 90 ×4 4V TEMP DIFFOUT ×8 RUN1 VOUTS2 470pF 85 RUN2 V LTM4650 FB1 TRACK1 VFB2 80 TRACK2 60.4k 0.1µF INTVCC EFFICIENCY (%) 75 COMP1 4.7µF 10k COMP2 PGOOD1 70 PINS NOT USED DIFFP PGOOD2 V V OUT2 IN = 12V IN THIS CIRCUIT: V f OUT2 1.2V VIN = 5V CLKOUT SET 50A 65 EXTVCC 121k PHASMD SGND GND MODE_PLLIN DIFFN 0 10 20 30 40 50 SW1 SW2 4650 TA01a LOAD CURRENT (A) 4650 TA01b VOUTS1 Rev. C Document Feedback For more information www.analog.com 1 Document Outline Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Revision History Package Photo Design Resources Related Parts