_______________________________________________________________ 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.

PMBus 5-Channel Power-Supply Manager

and Intelligent Fan Controller

19-5488; Rev 0; 8/10

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

*EP = Exposed pad.

Ordering Information

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

Temp Sensor ICs

Fault Detection on All Temp Sensors

S

PMBus™-Compliant Command Interface

S

Timeout Function

S

On-Board Nonvolatile Fault Logging and Default

Configuration Setting

S

No External Clocking Required

S

+3.3V Supply Voltage

PMBus is a trademark of SMIF, Inc.

SMBus is a trademark of Intel Corp.

PART

TEMP RANGE

PIN-PACKAGE

MAX34441ETL+

-40NC to +85NC

40 TQFN-EP*

MAX34441ETL+T

-40NC to +85NC

40 TQFN-EP*

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device