19-5527; Rev 2; 2/12
PMBus 6-Channel Power-Supply Manager
General Description
Features
S 6 Channels of Power-Supply Management
The MAX34440 is a complex system monitor that can
manage up to six power supplies. The power-supply
manager monitors the power-supply output voltage and
constantly checks for user-programmable overvoltage
and undervoltage thresholds. It can also margin the
power-supply output voltage up or down to a user-
programmable level. The margining is performed in a
closed-loop arrangement whereby the device automati-
cally adjusts a pulse-width-modulated (PWM) output and
then measures the resultant output voltage. The power-
supply manager can also sequence the supplies in any
order at both power-up and power-down. With the addi-
tion of an external current-sense amplifier, the device
can also monitor currents.
Voltage Measurement/Monitoring
Differential 12-Bit 1% Accurate ADC
Min/Max Threshold Excursion Detection
Supports Current Monitoring with External
Current-Sense Amplifier
Automatic Closed-Loop Margining
Programmable Up and Down Sequencing
Power-Good Output
S Supports Up to Eight Temperature Sensors
Two Remote Diode Temperature Sensors
Five Local Temperature Sensors
One Internal Temperature Sensor
Fault Detection on All Temp Sensors
S PMBus™-Compliant Command Interface
Applications
Network Switches/Routers
Base Stations
2
S I C/SMBus-Compatible Serial Bus with Bus
Timeout Function
S On-Board Nonvolatile Fault Logging and Default
Servers
Configuration Setting
Smart Grid Network Systems
Industrial Controls
S No External Clocking Required
S +3.3V Supply Voltage
Ordering Information
PART
TEMP RANGE
-40NC to +85NC
-40NC to +85NC
PIN-PACKAGE
40 TQFN-EP*
40 TQFN-EP*
MAX34440ETL+
MAX34440ETL+T
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
PMBus is a trademark of SMIF, Inc.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, go to: www.maxim-ic.com/errata.
_______________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.