Analog Devices LTM4683 Manual

Regulator with Digital Power System Management

FEATURES

Quad Digitally Adjustable Analog Loops with Digital
n
Interface for Control and Monitoring
Wide Input Voltage Range: 4.5V to 14V
n
Output Voltage Range: 0.3V to 0.7V
n
±0.5% DC Output Accuracy at 0.7V
n
±4.5% Current Readback Accuracy: 0°C to 125°C
n
Optimized for Low Output Voltage Ranges
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 × 5.71mm 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/Soft-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 14V
+
IN_01
22µF
R
×6
SENSE1
–
IN_01
V
IN01
SV
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
Low V Quad 31.25A or Single 125A µModule
OUT
2
C Serial Interface
LTM4683
2
I C/SMBus I/F WITH PMBus COMMAND
SET TO/FROM IPMI OR OTHER
BOARD MANAGEMENT CONTROLLER
For more information

DESCRIPTION

The LTM 4683 is a quad 31.25A or single 125A step-
®
down µModule (power micromodule) DC/DC regulator
®
featuring remote configurability and telemetry monitor-
ing of power management parameters over PMBus. The
LTM4683 is comprised of digitally programmable analog
control loops, and is optimized for higher bandwidth and
transient response.
The LTM4683's 2-wire serial interface allows outputs
to be margined, tuned, and ramped up and down at
programmable slew rates with sequencing delay times.
True input current sense, 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
user interface (GUI), DC1613A
and evaluation kits are available.
The LTM4683 is offered in a 15mm × 22mm × 5.71mm BGA
package available with a 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.
0.4V AT 31.25A
V
OUT0
CER
+
V
+
OSNS0
LOAD
C
BULK
–
V
OSNS0
0.5V AT 31.25A
V
OUT1
CER
+
V
+
OSNS1
LOAD
C
BULK
–
V
OSNS1
0.6V AT 31.25A
V
OUT2
CER
+
V
+
OSNS2
LOAD
C
BULK
–
V
OSNS2
0.7V AT 31.25A
V
OUT3
CER
+
V
+
OSNS3
LOAD
C
BULK
–
V
Configurable Output Array
OSNS3
31.25A
4683 TA01a
31.25A
31.25A
31.25A
www.analog.com
LTM4683
LTpowerPlay graphical
®
USB-to-PMBus converter,
Channel Efficiency vs Load Current
100
95
90
85
80
75
12V , 0.3V , 250kHz
IN OUT
70
12V , 0.4V , 350kHz
IN OUT
12V , 0.5V , 425kHz
IN OUT
65
12V , 0.6V , 500kHz
IN OUT
12V , 0.7V , 575kHz
IN OUT
60
0 5 10 15 20 25
LOAD CURRENT (A)
62.5A 62.5A
93.75A
31.25A
62.5A
31.25A 31.25A
30 35
4683 TA01b
125A
Rev. 0
1