Analog Devices Linear ADI Power LTM4681 Manual

Quad 31.25A or Single 125A µModule Regulator

FEATURES

Quad Digitally Adjustable Analog Loops with Digital
n
Interface for Control and Monitoring
Wide Input Voltage Range: 4.5V to 16V
n
Output Voltage Range: 0.5V to 3.3V
n
±0.5% Maximum DC Output Error Over Temperature
n
±4% Current Readback Accuracy: 0°C to 125°C
n
Integrated Input Current Sense Amplifier
n
400kHz PMBus-Compliant I
n
Supports Telemetry Polling Rates Up to 125Hz
n
Integrated 16-Bit ∆Σ ADC
n
Parallel and Current Share Multiple Modules
n
15mm × 22mm × 8.17mm BGA Package
n
Readable Data:
Input and Output Voltages, Currents, and Temperatures
n
Running Peak Values, Uptime, Faults and Warnings
n
Onboard EEPROM Fault Log Record
n
Writable Data and Configurable Parameters:
Output Voltage, Voltage Sequencing and Margining
n
Digital Soft-Start/Stop Ramp, Program Analog Loop
n
OV/UV/OT, UVLO, Frequency and Phasing
n

APPLICATIONS

Multi-Rail Processor Power, Configurable Core Power
n

TYPICAL APPLICATION

Quad 31.25A µModule Regulator with Digital Interface for Control and Monitoring
4.5V TO 16V
+
IN_01
22µF
R
×6
SENSE1
–
IN_01
V
IN01
SV
4.5V TO 16V
IN_01
+
IN_23
22µF
R
×6 SENSE2
–
IN_23
V
IN23
SV
IN_23
V
IN_VBIAS
RUNP
ON/OFF CONTROL RUN0,1,2,3
FAULT INTERRUPTS FAULT0,1,2,3
POWER GOOD MONITORS PGOOD0,1,2,3
(FROM 4.5V TO 5.5V
CONNECT V , SV ,
IN IN
AND INTV TOGETHER)
CC
FOR COMPLETE CIRCUIT SYNCHRONIZATION TIME
SEE FIGURE 48 BASE REGISTER WRITE
PROTECTION
Document Feedback
with Digital Power System Management
2
C Serial Interface
LTM4681
2
I C/SMBus I/F WITH PMBus COMMAND
SET TO/FROM IPMI OR OTHER
BOARD MANAGEMENT CONTROLLER
For more information

DESCRIPTION

The LTM 4681 is a quad 31.25A or single 125A step-
®
down µModule (power module) DC/DC regulator fea-
®
turing remote configurability and telemetry-monitoring
of power management parameters over PMBus. The
LTM4681 is comprised of digitally programmable analog
control loops, precision mixed-signal circuitry, EEPROM,
power MOSFETs, inductors and supporting components.
The LTM4681's 2-wire serial interface allows outputs
to be margined, tuned and ramped up and down at pro-
grammable slew rates with sequencing delay times. True
input current sense, output currents and voltages, output
power, temperatures, uptime and peak values are read-
able. 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
USB-to-PMBus converter and demo kits are available.
The LTM4681 is offered in a 15mm × 22mm × 8.17mm
BGA package available with SnPb or RoHS compliant
terminal finish.
All registered trademarks and 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.
0.9V AT 31.25A
V
OUT0
CER
+
V
+
OSNS0
LOAD
C
BULK
–
V
OSNS0
1V AT 31.25A
V
OUT1
CER
+
V
+
OSNS1
LOAD
C
BULK
–
V
OSNS1
1.2V AT 31.25A
V
OUT2
CER
+
V
+
OSNS2
LOAD
C
BULK
–
V
OSNS2
1.5V AT 31.25A
V
OUT3
CER
+
V
+
OSNS3
LOAD
C
BULK
–
V
Configurable Output Array
OSNS3
31.25A
4681 TA01a
31.25A
31.25A
31.25A
www.analog.com
LTM4681
LTpowerPlay GUI and DC1613
®
Channel Efficiency vs Load Current
95
94
93
92
91
90
89
88
12V , 0.9V
IN OUT
87
12V , 1.0V
IN OUT
12V , 1.2V
86
IN OUT
12V , 1.5V
IN OUT
85
0 5 10 15 20 25
OUTPUT CURRENT (A)
62.5A 62.5A
93.75A
31.25A
62.5A
31.25A 31.25A
, 250kHz
, 250kHz
, 350kHz
, 425kHz
30 35
4681 TA01b
125A
Rev. A
1