EVALUATION KIT AVAILABLE MAX34408/MAX34409 SMBus Dual/Quad Current Monitor General Description Benefits and Features The MAX34408/MAX34409 are two- and four-channel Enables Accurate Current Consumption Measurement current monitors that are configured and monitored with a on Up to Four Rails with Digita l Serial Readout 2 standard I C/SMBus serial interface. Each unidirectional Low 12.25mV Full-Scale Current-Sense Voltage current sensor offers precision high-side operation with a Automatic Round Robin Sequencing to Sample low full-scale sense voltage. The devices automatically Each Current-Sense Input Selectable Averaging to Improve Current-Sense sequence through two or four channels and collect the current-sense samples and average them to reduce the Accuracy Programmable Digital Overcurrent Thresholds with effect of impulse noise. The raw ADC samples are com- pared to user-programmable digital thresholds to indicate Delay Function 2 I C/SMBus Interface with Bus Timeout overcurrent conditions. Overcurrent conditions trigger a Register Access to Real-Time Current Measurements hardware output to provide an immediate indication to shut down any necessary external circuitry. Compatible on a Wide Range of Voltage Rails Wide 2.5V to 13.2V Common-Mode Range Applications Automatic System Shutdown on Overcurrent Condition Network Switches and Rou ters Shutdown Output Provides Immediate Hardware Base Stations Indication of Overcurrent Servers Smart Grid Network Systems Industrial Controls For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX34408.related. Ordering Information appears at end of data sheet. Typical Application Circuit and Block Diagram 2.7V TO 3.6V V DD POWER CONTROL MAX34408/MAX34409 GND LATCH AND DELAY RESET ENA AUTOMATIC NOT PRESENT SEQUENCING ON MAX34408 RESET OPTIONAL AMPLIFIER 4 SHTDN FILTER CURRENT OR AMPLIFIER 3 NETWORK SHUTDOWN SHUTDOWN FLOW DELAY LATCH AMPLIFIER 2 AMPLIFIER 1 2 OR 100 SHUTDOWN DELAY RESET IN+ 4 OVER- MUX 1F DIGITAL CURRENT VREF R COMPARATOR SENSE REGISTERS DETECTION 2 OR 100 1F 4 DELAY IN- CURRENT- ADC AVERAGING SENSE AMPLIFIER SCL SDA SMBus ALERT INTERFACE ADDR EP (EXPOSED PAD) RADDR 19-6792 Rev 1 1/15MAX34408/MAX34409 SMBus Dual/Quad Current Monitor Absolute Maximum Ratings Voltage Range on V Relative to GND ................-0.3V to +4V Continuous Power Dissipation (T = +70C) DD A Voltage Range on IN+, IN- Relative to GND .........-0.3V to +16V 16-Pin TQFN (derate 25mW/C above +70C) ......... 2000mW Voltage Range on All Other Pins Operating Temperature Range ........................... -40C to +85C Relative to GND... -0.3V to (V + 0.3V) (not to exceed +4V) Storage Tempera ture Range ............................ -55C to +125C DD Differential Input Voltage, IN+ to IN- ...................................16V Soldering Temperature (reflow) .......................................+260C Lead Temperatur e (soldering, 10s) .................................+300C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Thermal Characteristics(Note 1) TQFN Junction-to-Ambient Thermal Resistance ( )...........40C/ W JA Junction-to-Case Thermal Resistance ( )..................6C/ W JC Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Recommended DC Operating Conditions (T = -40C to +85C.) (Notes 2, 3) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V Operating Voltage Range V 2.7 3.6 V DD DD V x V + DD DD Input Logic 1: ENA Pin V V IH1 0.7 0.3 Input Logic 0: ENA Pin V -0.3 +0.3 x V V IL1 DD Input Logic 1: SCL/SDA Pins V 2.1 V + 0.3 V IH2 DD Input Logic 0: SCL/SDA Pins V -0.3 +0.8 V IL2 Electrical Characteristics (V = V = 12V, V = 0V, V = 2.7V to 3.6V, T = -40C to +85C, unless otherwise noted. Typical values are at V = 3.3V IN+ IN- SENSE DD A DD and T = +25C.) (Notes 2, 3) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current I SMBus idle 830 A DD Current-Sense Common-Mode 2.5 13.2 V Input Range Common-mode voltage = 13.2V, IN input Input Bias Current (IN+/IN-) 2 A differential = 12.25mV ADC Resolution 8 Bits Per-Channel Current 1 ksps Sample Rate IN Input Full Scale 12.00 12.25 12.50 mV ADC INL 0.5 2 LSB ADC DNL 0.5 2 LSB IN Input Offset 0.5 4 LSB Maxim Integrated 2 www.maximintegrated.com