Datasheet LTM4645 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 25A DC/DC Step-Down µModule Regulator |
| Pages / Page | 34 / 1 — FeaTures. DescripTion. 4.7V to 15V Input Voltage Range. 0.6V to 1.8V … |
| File Format / Size | PDF / 707 Kb |
| Document Language | English |
FeaTures. DescripTion. 4.7V to 15V Input Voltage Range. 0.6V to 1.8V Output Voltage Range. 25A DC Output Current
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LTM4645 25A DC/DC Step-Down µModule Regulator
FeaTures DescripTion
n
4.7V to 15V Input Voltage Range
The LTM®4645 is a 25A output switching mode step-down n
0.6V to 1.8V Output Voltage Range
DC/DC µModule® (power module) regulator. Included in n
25A DC Output Current
the package are the switching controller, power FETs, in- n
±1.2% Total DC Output Voltage Error (–40°C to 125°C)
ductor and all supporting components. Operating over an n
High Reliability N + 1 Phase Redundancy Supported
input voltage range of 4.7V to 15V, the LTM4645 supports n
Internal or External Control Loop Compensation
an output voltage range of 0.6V to 1.8V, set by a single n
Differential Remote Sense Amplifier for Precision
external resistor. Only a few input and output capacitors
Regulation
are needed. n
Current Mode Control/Fast Transient Response
Its high efficiency design delivers about 86% efficiency n
Multiphase Current Sharing Up to 150A
from 12V input to 1.0V output with 25A continuous load n
Built-In Temperature Monitoring
current. High switching frequency and a current-mode n Selectable Pulse-Skipping, Burst Mode® Operation architecture enable a very fast transient response to line n Soft-Start/Voltage Tracking and load changes without sacrificing stability. The device n Frequency Synchronization supports frequency synchronization, programmable n Output Overvoltage Protection multiphase operation, N+1 phase redundancy, and output n Output Overcurrent Foldback Protection voltage tracking for supply rail sequencing. n 9mm × 15mm × 3.51mm BGA Package Fault protection features include overvoltage and overcur- rent protection. The power module is offered in a space
applicaTions
saving 9mm × 15mm × 3.51mm BGA package. The n Telecom, Networking and Industrial Equipment LTM4645 is available with SnPb (BGA) or RoHS compli- n Point of Load Regulation ant terminal finish. L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, µModule, LTpowerCAD and PolyPhase are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners.
Typical applicaTion Efficiency vs Output Current 12VIN, 1VOUT, 25A DC/DC µModule Regulator at 1V Output
4.7µF 100 1µF 6.3V 2.2Ω 95 SVIN V DRVCC INTVCC 90 IN VIN 6V TO 15V 22µF 85 25V HIZB ×2 FREQ LTM4645 VOUT 80 VOUT 1V 43.2k 75 COMPa V 25A OSNS+ 47pF EFFICIENCY (%) COMPb VFB 100µF 70 TRACK/SS VOSNS– 90.9k 6.3V 0.1µF ×4 65 5V INPUT SGND GND 12V INPUT 60 4645 TA01a 0 5 10 15 20 25 PINS NOT USED IN THIS CIRCUIT: LOAD CURRENT (A) CLKOUT, MODE/PLLIN, PGOOD, PHASMD, PWM, RUN, SW, TEMP+, TEMP– 4645 TA01b 4645f For more information www.linear.com/LTM4645 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Package Photo Design Resources Related Parts
FeaTures DescripTion
n
4.7V to 15V Input Voltage Range
The LTM®4645 is a 25A output switching mode step-down n
0.6V to 1.8V Output Voltage Range
DC/DC µModule® (power module) regulator. Included in n
25A DC Output Current
the package are the switching controller, power FETs, in- n
±1.2% Total DC Output Voltage Error (–40°C to 125°C)
ductor and all supporting components. Operating over an n
High Reliability N + 1 Phase Redundancy Supported
input voltage range of 4.7V to 15V, the LTM4645 supports n
Internal or External Control Loop Compensation
an output voltage range of 0.6V to 1.8V, set by a single n
Differential Remote Sense Amplifier for Precision
external resistor. Only a few input and output capacitors
Regulation
are needed. n
Current Mode Control/Fast Transient Response
Its high efficiency design delivers about 86% efficiency n
Multiphase Current Sharing Up to 150A
from 12V input to 1.0V output with 25A continuous load n
Built-In Temperature Monitoring
current. High switching frequency and a current-mode n Selectable Pulse-Skipping, Burst Mode® Operation architecture enable a very fast transient response to line n Soft-Start/Voltage Tracking and load changes without sacrificing stability. The device n Frequency Synchronization supports frequency synchronization, programmable n Output Overvoltage Protection multiphase operation, N+1 phase redundancy, and output n Output Overcurrent Foldback Protection voltage tracking for supply rail sequencing. n 9mm × 15mm × 3.51mm BGA Package Fault protection features include overvoltage and overcur- rent protection. The power module is offered in a space
applicaTions
saving 9mm × 15mm × 3.51mm BGA package. The n Telecom, Networking and Industrial Equipment LTM4645 is available with SnPb (BGA) or RoHS compli- n Point of Load Regulation ant terminal finish. L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, µModule, LTpowerCAD and PolyPhase are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners.
Typical applicaTion Efficiency vs Output Current 12VIN, 1VOUT, 25A DC/DC µModule Regulator at 1V Output
4.7µF 100 1µF 6.3V 2.2Ω 95 SVIN V DRVCC INTVCC 90 IN VIN 6V TO 15V 22µF 85 25V HIZB ×2 FREQ LTM4645 VOUT 80 VOUT 1V 43.2k 75 COMPa V 25A OSNS+ 47pF EFFICIENCY (%) COMPb VFB 100µF 70 TRACK/SS VOSNS– 90.9k 6.3V 0.1µF ×4 65 5V INPUT SGND GND 12V INPUT 60 4645 TA01a 0 5 10 15 20 25 PINS NOT USED IN THIS CIRCUIT: LOAD CURRENT (A) CLKOUT, MODE/PLLIN, PGOOD, PHASMD, PWM, RUN, SW, TEMP+, TEMP– 4645 TA01b 4645f For more information www.linear.com/LTM4645 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Package Photo Design Resources Related Parts
