Datasheet LTM4642 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 20VIN, Dual 4A or Single 8A DC/DC μModule Regulator |
| Pages / Page | 32 / 1 — FeaTures. DescripTion. Small Form Factor Dual 4A Power Supply. Wide Input … |
| File Format / Size | PDF / 1.1 Mb |
| Document Language | English |
FeaTures. DescripTion. Small Form Factor Dual 4A Power Supply. Wide Input Voltage Range: 4.5V to 20V
Model Line for this Datasheet
Text Version of Document
LTM4642 20VIN, Dual 4A or Single 8A DC/DC µModule Regulator
FeaTures DescripTion
n
Small Form Factor Dual 4A Power Supply
The LTM®4642 is a complete dual 4A or single 8A step-down n
Wide Input Voltage Range: 4.5V to 20V
DC/DC μModule® (micromodule) regulator. Included in the
(2.375V Min with CPWR Bias)
package are the switching controller, power FETs, inductor, n
Dual 180° Out-of-Phase Outputs with 4A DC
and all support components. Operating over input voltage n
Dual Outputs with 0.6V to 5.5V Range
ranges of 4.5V to 20V, (2.375V min with external CPWR n
Output Voltage Tracking
bias), the LTM4642 supports two outputs with voltage n
±1.5% Maximum Total DC Output Voltage Error
ranges of 0.6V to 5.5V, set by a single external resistor. n
Up to 95% Maximum Efficiency
Its high efficiency design delivers 4A continuous current n
Phase-Lockable Fixed Frequency 600kHz to 1.4MHz
(5A peak) for each output. n
Constant On-Time, Valley Current Mode Architecture
High switching frequency and a valley current mode n
Selectable Burst Mode® Operation
architecture enable a very fast transient response to line n Output Overvoltage and Overcurrent Protection and load changes without sacrificing stability. The two n 9mm × 11.25mm × 4.92mm BGA Package outputs are interleaved with 180° phase to minimize the ripple noise and reduce the I/O capacitors.
applicaTions
The power module is offered in a 9mm × 11.25mm × n Telecom and Networking Equipment 4.92mm BGA package. The LTM4642 is RoHS compliant n Servers with Pb-free finish. n FPGA Power L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, µModule and LTpowerCAD are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611, 8163643.
Typical applicaTion Dual 4A 1V and 1.2V DC/DC µModule Regulator
V 2.2Ω IN INTVCC
Efficiency vs Load Current at 12V input
4.75V TO 20V 4.7µF 22µF 133k 90 2× V 1.2V (650kHz) IN1 VIN2 CPWR DRVCC INTVCC RUN1 VRNG1 85 10k 10k RUN2 1V (650kHz) PGOOD1 TRACK/SS1 0.1µF PGOOD2 80 V V OUT1 1V AT 4A LOAD OUT1 TRACK/SS2 + V EFFICIENCY (%) OUT2 1.2V AT 4A LOAD 47µF 0.1µF LTM4642 V 100µF OUT2 + 75 47µF 100µF FREQ INTVCC MODE/PLLIN VOUTS1 70 0 0.5 1 1.5 2 2.7 3 3.5 4 VOUTS– 61.9k LOAD CURRENT (A) VFB2 470pF 470pF 4642 TA01b SGND GND V V FB1 OUT1 VOUT2 90.9k 60.4k PINS NOT USED: COMP1, COMP2, PHASEMD, CLKOUT, EXTVCC, SW1, SW2 4642 TA01a 4642fb For more information www.linear.com/LTM4642 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Package Photograph Design Resources Related Parts
FeaTures DescripTion
n
Small Form Factor Dual 4A Power Supply
The LTM®4642 is a complete dual 4A or single 8A step-down n
Wide Input Voltage Range: 4.5V to 20V
DC/DC μModule® (micromodule) regulator. Included in the
(2.375V Min with CPWR Bias)
package are the switching controller, power FETs, inductor, n
Dual 180° Out-of-Phase Outputs with 4A DC
and all support components. Operating over input voltage n
Dual Outputs with 0.6V to 5.5V Range
ranges of 4.5V to 20V, (2.375V min with external CPWR n
Output Voltage Tracking
bias), the LTM4642 supports two outputs with voltage n
±1.5% Maximum Total DC Output Voltage Error
ranges of 0.6V to 5.5V, set by a single external resistor. n
Up to 95% Maximum Efficiency
Its high efficiency design delivers 4A continuous current n
Phase-Lockable Fixed Frequency 600kHz to 1.4MHz
(5A peak) for each output. n
Constant On-Time, Valley Current Mode Architecture
High switching frequency and a valley current mode n
Selectable Burst Mode® Operation
architecture enable a very fast transient response to line n Output Overvoltage and Overcurrent Protection and load changes without sacrificing stability. The two n 9mm × 11.25mm × 4.92mm BGA Package outputs are interleaved with 180° phase to minimize the ripple noise and reduce the I/O capacitors.
applicaTions
The power module is offered in a 9mm × 11.25mm × n Telecom and Networking Equipment 4.92mm BGA package. The LTM4642 is RoHS compliant n Servers with Pb-free finish. n FPGA Power L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, µModule and LTpowerCAD are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611, 8163643.
Typical applicaTion Dual 4A 1V and 1.2V DC/DC µModule Regulator
V 2.2Ω IN INTVCC
Efficiency vs Load Current at 12V input
4.75V TO 20V 4.7µF 22µF 133k 90 2× V 1.2V (650kHz) IN1 VIN2 CPWR DRVCC INTVCC RUN1 VRNG1 85 10k 10k RUN2 1V (650kHz) PGOOD1 TRACK/SS1 0.1µF PGOOD2 80 V V OUT1 1V AT 4A LOAD OUT1 TRACK/SS2 + V EFFICIENCY (%) OUT2 1.2V AT 4A LOAD 47µF 0.1µF LTM4642 V 100µF OUT2 + 75 47µF 100µF FREQ INTVCC MODE/PLLIN VOUTS1 70 0 0.5 1 1.5 2 2.7 3 3.5 4 VOUTS– 61.9k LOAD CURRENT (A) VFB2 470pF 470pF 4642 TA01b SGND GND V V FB1 OUT1 VOUT2 90.9k 60.4k PINS NOT USED: COMP1, COMP2, PHASEMD, CLKOUT, EXTVCC, SW1, SW2 4642 TA01a 4642fb For more information www.linear.com/LTM4642 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Package Photograph Design Resources Related Parts
