LTM4676 반도체 회로 부품 판매점
Dual 13A or Single 26A uModule Regulator
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 Linear Technology |
Features
LTM4676
Dual 13A or Single 26A
µModule Regulator with Digital
Power System Management
Description
n Dual, Fast, Analog Loops with Digital Interface
for
Control and Monitoring
n Wide Input Voltage Range: 4.5V to 26.5V
n Output Voltage Range: 0.5V to 5.4V (4V on VOUT0)
n ±1% Maximum DC Output Error Over Temperature
n ±2.5% Current Readback Accuracy at 10A Load
n 400kHz PMBus-Compliant I2C Serial Interface
n Integrated 16-Bit ∆Σ ADC
n Constant Frequency Current Mode Control
n Parallel and Current Share Multiple Modules
n 16 Slave Addresses; Rail/Global Addressing
n 16mm × 16mm × 5.01mm BGA Package
Readable Data:
n Input and Output Voltages, Currents, and Temperatures
n Running Peak Values, Uptime, Faults and Warnings
n Onboard EEPROM Fault Log Record
Writable Data and Configurable Parameters:
n Output Voltage, Voltage Sequencing and Margining
n Digital Soft-Start/Stop Ramp
n OV/UV/OT, UVLO, Frequency and Phasing
Applications
n System Optimization, Characterization and Data Min-
ing in Prototype, Production and Field Environments
n Telecom, Datacom, and Storage Systems
The LTM®4676 is a dual 13A or single 26A step-down
µModule® (micromodule) DC/DC regulator featuring re-
mote configurability and telemetry-monitoring of power
management parameters over PMBus— an open standard
I2C-based digital interface protocol . The LTM4676 is
comprised of fast analog control loops, precision mixed-
signal circuitry, EEPROM, power MOSFETs, inductors and
supporting components.
The LTM4676’s 2-wire serial interface allows outputs to be
margined, tuned and ramped up and down at programmable
slew rates with sequencing delay times. Input and output
currents and voltages, output power, temperatures, uptime
and peak values are readable. Custom configuration of
the EEPROM contents is not required. At start-up, output
voltages, switching frequency, and channel phase angle
assignments can be set by pin-strapping resistors. The
LTpowerPlay™ GUI and DC1613 USB-to-PMBus converter
and demo kits are available.
The LTM4676 is offered in a 16mm × 16mm × 5.01mm
BGA package available with SnPb or RoHS compliant
terminal finish.
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase
are registered trademarks and LTpowerPlay is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258, 7420359,
8163643. Licensed under U.S. Patent 7000125 and other related patents worldwide.
Click to view associated Video Design Idea.
Typical Application
Dual 13A µModule Regulator with Digital
Interface for Control and Monitoring*
VIN
5.75V TO 26.5V 22µF
×3
ON/OFF CONTROL
FAULT INTERRUPTS,
POWER SEQUENCING
VIN0
VIN1
SVIN
VOUT0
VOSNS0+
RUN0
RUN1
VOSNS0–
LTM4676 VOUT1
GPIO0
GPIO1
VOSNS1
PWM CLOCK AND
TIME-BASE
SYNCHRONIZATION
REGISTER WRITE
PROTECTION
SYNC
SHARE_CLK
WP GND
*FOR COMPLETE CIRCUIT, SEE FIGURE 44
SGND
SCL
SDA
ALERT
4676 TA01a
VOUT0,
ADJUSTABLE
UP TO 13A
LOAD0
100µF
×7
VOUT1,
ADJUSTABLE
UP TO 13A
LOAD1
100µF
×7
I2C/SMBus I/F WITH
PMBus COMMAND SET
TO/FROM IPMI OR OTHER
BOARD MANAGEMENT
CONTROLLER
Using PMBus and LTpowerPlay to Monitor Telemetry and Margin
VOUT0/VOUT1 During Load Pattern Tests. 10Hz Polling Rate. 12VIN
Output Voltage Readback, VOUT Margined 7.5% Low
1.1 1.9
1.0 1.8
0.9 1.7
0.8
0
1.6
3 6 9 12
TIME (SEC)
4677 TA01b
Input Current Readback
1.5 2.4
1.0 1.6
0.5 0.8
00
0 3 6 9 12
TIME (SEC)
4676 TA01d
Output Current Readback, Varying Load Pattern
15 15
10 10
55
00
0 3 6 9 12
TIME (SEC)
4676 TA01c
Power Stage Temperature Readback
60 60
57 57
54 54
51 51
0 3 6 9 12
TIME (SEC)
4676 TA01e
4676fd
For more information www.linear.com/LTM4676
1
LTM4676
Table of Contents
Features...................................................... 1
Applications................................................. 1
Typical Application ......................................... 1
Description.................................................. 1
Absolute Maximum Ratings............................... 3
Order Information........................................... 3
Pin Configuration........................................... 3
Electrical Characteristics.................................. 4
Typical Performance Characteristics................... 11
Pin Functions............................................... 14
Simplified Block Diagram................................ 19
Decoupling Requirements................................ 19
Functional Diagram....................................... 20
Test Circuits................................................ 21
Operation................................................... 22
Power Module Introduction.....................................22
Power Module Configurability and
Readback Data......................................................... 24
Time-Averaged and Peak Readback Data.................26
Power Module Overview..........................................29
EEPROM.................................................................. 33
Additional Information.............................................33
Applications Information................................. 34
LTM4676 Control IC Differences from LTC3880......34
VIN to VOUT Step-Down Ratios.................................45
Input Capacitors......................................................45
Output Capacitors....................................................45
Light Load Current Operation..................................45
Switching Frequency and Phase..............................46
Minimum On-Time Considerations..........................48
Variable Delay Time, Soft-Start and Output Voltage
Ramping.................................................................. 48
Digital Servo Mode.................................................. 49
Soft Off (Sequenced Off).........................................50
Undervoltage Lockout..............................................50
Fault Conditions....................................................... 51
Open-Drain Pins...................................................... 51
Phase-Locked Loop and Frequency
Synchronization....................................................... 52
RCONFIG Pin-Straps (External Resistor
Configuration Pins).................................................. 52
Voltage Selection..................................................... 52
Connecting the USB to the I2C/SMBus/PMBus
Controller to the LTM4676 In System......................53
LTpowerPlay: An Interactive GUI for Digital Power
System Management...............................................54
PMBus Communication and Command
Processing............................................................... 56
Thermal Considerations and
Output Current Derating..........................................58
EMI Performance.....................................................66
Safety Considerations.............................................. 67
Layout Checklist/Example....................................... 67
Typical Applications....................................... 68
Package Description...................................... 74
Package Photograph...................................... 75
Package Description...................................... 76
Revision History........................................... 77
Typical Application........................................ 78
Design Resources......................................... 78
Related Parts............................................... 78
The LTC3880 data sheet is an essential reference document for this product.
To obtain it go to:
www.linear.com/LTC3880
4676fd
2 For more information www.linear.com/LTM4676
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LTM4676 regulator
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