MAX34441 Datasheet, PDF (1/53 Pages) Maxim Integrated Products – PMBus 5-Channel Power-Supply Manager and Intelligent Fan Controller

19-5488; Rev 0; 8/10
PMBus 5-Channel Power-Supply Manager
and Intelligent Fan Controller
General Description
The MAX34441 is a complex system monitor that can man-
age up to five power supplies and a fan. 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-programma-
ble level. The margining is performed in a closed-loop
arrangement whereby the device automatically adjusts
a pulse-width-modulated (PWM) output and then mea-
sures 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 addition of
an external current-sense amplifier, the device can also
monitor currents.
The device also contains closed-loop fan-speed control.
Based on user-programmable settings for fan-control
PWM duty cycles or RPM speeds at particular tempera-
ture breakpoints, the device automatically adjusts the fan
speed in a manner to reduce audible noise and power
consumption.
Applications
Network Switches/Routers
Base Stations
Servers
Smart Grid Network Systems
Industrial Controls
Features
S 5 Channels of Power-Supply Management
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 1 Channel of Fan Control
Supports 3-Wire and 4-Wire Fans
Automatic Closed-Loop Fan-Speed Control
Support for Dual Tachometer Fans
Fan-Fault Detection
S Supports Up to Six Temperature Sensors
External Thermal Diode Interface with
Automatic Series Resistance Cancellation
One Internal Temperature Sensor
Support for Up to Four Additional I²C Digital
Temp Sensor ICs
Fault Detection on All Temp Sensors
S PMBus™-Compliant Command Interface
S I²C/SMBus™-Compatible Serial Bus with Bus
Timeout Function
S On-Board Nonvolatile Fault Logging and Default
Configuration Setting
S No External Clocking Required
S +3.3V Supply Voltage
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX34441ETL+
-40NC to +85NC 40 TQFN-EP*
MAX34441ETL+T -40NC to +85NC 40 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
PMBus is a trademark of SMIF, Inc.
SMBus is a trademark of Intel Corp.
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.
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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.