MAX34408:SMBus Dual/Quad Current Monitor

Accurate Current Measurement with Automatic Overcurrent Shutdown for Four Supply Rails

The MAX34408 and MAX34409 are two- and four-channel current monitors that are configured and monitored with a standard I2C/SMBus serial interface. Each unidirectional current sensor offers precision high-side operation with a low full-scale sense voltage. The devices automatically sequence through two or four channels and collect the current-sense samples and average them to reduce the effect of impulse noise. The raw ADC samples are compared to user-programmable digital thresholds to indicate overcurrent conditions. Overcurrent conditions trigger a hardware output to provide an immediate indication to shut down any necessary external circuitry.

Key Features
  • Enables Accurate Current Consumption Measurement on Up to Four Rails with Digital Serial Readout
    • Low 12.25mV Full-Scale Current-Sense Voltage
    • Automatic Round Robin Sequencing to Sample Each Current-Sense Input
    • Selectable Averaging to Improve Current-Sense Accuracy
    • Programmable Digital Overcurrent Thresholds with Delay Function
    • I2C/SMBus Interface with Bus Timeout
    • Register Access to Real-Time Current Measurements
  • Compatible on a Wide Range of Voltage Rails
    • Wide 2.5V to 13.2V Common-Mode Range
  • Automatic System Shutdown on Overcurrent Condition
    • Shutdown Output Provides Immediate Hardware Indication of Overcurrent
MAX34408, MAX34409: Typical Application Circuit and Block Diagram
MAX34408, MAX34409: Typical Application Circuit and Block Diagram
Applications/Uses
  • Base Stations
  • Industrial Controls
  • Network Switches and Routers
  • Servers
  • Smart Grid Network Systems
DataSheet
titleDownload file
MAX34408-MAX34409 Data SheetMAX34408-MAX34409.pdf
Parametrics
Part NumberOutput FormatCMVR
(V)
CMVR
(V)
VCC
(V)
VCC
(V)
ICC
(µA)
Bi-Dir. Curr. SenseVSENSE_FS
(mV)
VOS @25°C
(µV)
Gain Accuracy @25°C
(%)
Comp-
arators
ReferenceOper. Temp.
(°C)
Package/PinsBudgetary
Price
minmaxminmaxtyprecomm.maxmaxSee Notes
MAX34408Digital2.513.22.73.6830No1019122Bandgap-40 to +85TQFN/16$2.42 @1k
MAX344094TQFN/16$2.51 @1k
Design kits & evaluation modules
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX34408ETE+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX34408ETE+TActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX34408EVKIT#ActiveEVKIT;-40°C to +85°CSee data sheet
MAX34408-MAX34409.pdf MAX34409
MAX34408-MAX34409_cn.pdf MAX34409
MAX34408.pdf MAX34408
MAX34408-MAX34409_cn.pdf MAX34408