LTM4676_15 Datasheet, PDF (1/78 Pages) Linear Technology – Dual 13A or Single 26A Module Regulator with Digital Power System Management

LTM4676
Features
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 I}²_{C 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*
V_IN
5.75V TO 26.5V _22µF
×3
ON/OFF CONTROL
FAULT INTERRUPTS,
POWER SEQUENCING
V_IN0
V_IN1
SV_IN
V_OUT0
V_OSNS0⁺
RUN₀
RUN₁
V_OSNS0–
LTM4676
V_OUT1
GPIO₀
GPIO₁
V_OSNS1
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
LOAD₀
V_OUT0,
ADJUSTABLE
UP TO 13A
100µF
×7
LOAD₁
V_OUT1,
ADJUSTABLE
UP TO 13A
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
V_OUT0/V_OUT1 During Load Pattern Tests. 10Hz Polling Rate. 12V_IN
Output Voltage Readback, V_OUT Margined 7.5% Low
1.1
1.9
Input Current Readback
1.5
2.4
1.0
1.8
1.0
1.6
0.9
1.7
0.5
0.8
0.8
0
1.6
3
6
9
12
TIME (SEC)
4677 TA01b
0
0
0
3
6
9
12
TIME (SEC)
4676 TA01d
Output Current Readback, Varying Load Pattern
15
15
10
10
5
5
0
0
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
4676fc
For more information www.linear.com/LTM4676
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