MAX9934
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MAX9934

High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing

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Chip Select Allows Users to Mux Multiple MAX9934s onto a Single ADC Input

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 5
1ku List Price Starting From $1.39
Features
  • Input Offset Voltage: 10µV (max)
  • Gain Error Less than 0.25%
  • -0.1V to +5.5V Input Common-Mode Voltage Range
  • Chip Select Allows Multiplexing Several MAX9934 Current Monitors to One ADC
  • Current Output Allows ROUT Selection for Gain Flexibility
  • Single Supply Operation: 2.5V to 3.6V
  • Two Gain Options: GM of 25µA/mV (MAX9934T) and 5µA/mV (MAX9934F)
  • Bidirectional or Unidirectional Operation
  • Small, 6-Bump UCSP (1mm x 1.5mm x 0.6mm) and 8-Pin µMAX Packages
Additional Details
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The MAX9934 high-precision, low-voltage, high-side current-sense amplifier is ideal for both bidirectional (charge/discharge) and unidirectional current measurements in battery-powered portable and laptop devices. Input offset voltage (VOS) is a low 10µV (max) at +25°C across the -0.1V to 5.5V input common-mode voltage range, and is independent of VCC. Its precision input specification allows the use of very small sense-voltages (typically ±10mV full-scale) for minimally invasive current sensing.

The output of the MAX9934 is a current proportional to input VSENSE and is available in either 25µA/mV or 5µA/mV gain options (GM) with gain accuracy better than 0.25% (max) at +25°C. A chip select (CS) allows multiplexing of several MAX9934 current outputs to a single microcontroller ADC channel (see the Typical Operating Circuit). CS is compatible with 1.8V and 3.3V logic systems.

The MAX9934 is designed to operate from a 2.5V to 3.6V VCC supply, and draws just 120µA (typ) quiescent current. When powered down (VCC = 0V), RS+ and RS- draw less than 0.1nA (typ) leakage current to reduce battery load. The MAX9934 is robust and protected from input faults of up to ±6V input differential voltage between RS+ and RS-.

The MAX9934 is specified for operation over the -40°C to +125°C temperature range and is available in 8-pin µMAX® or a 6-bump UCSP (1mm x 1.5mm x 0.6mm), making it ideal for space-sensitive applications.

Applications

  • MP3 Players
  • Notebook PCs and Ultra-Mobile PCs
  • PDAs and Smartphones
  • Portable Current Monitoring
  • Sensor Instrumentation Amplifiers
Part Models 5
1ku List Price Starting From $1.39

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Documentation

Documentation

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Product Lifecycle

PCN

Sep 19, 2018

- 1753N

ASSEMBLY

MAX9934FAUA+

PRODUCTION

MAX9934FAUA+T

PRODUCTION

MAX9934TAUA+

PRODUCTION

MAX9934TAUA+T

PRODUCTION

Jul 19, 2016

- 1594_AMENDED

ASSEMBLY

MAX9934TART+T

LAST TIME BUY

Dec 8, 2015

- 1594_PRE-PCN

WAFER FAB

MAX9934TART+T

LAST TIME BUY

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Sep 19, 2018

- 1753N

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ASSEMBLY

MAX9934FAUA+

PRODUCTION

MAX9934FAUA+T

PRODUCTION

MAX9934TAUA+

PRODUCTION

MAX9934TAUA+T

PRODUCTION

Jul 19, 2016

- 1594_AMENDED

arrow down

ASSEMBLY

MAX9934TART+T

LAST TIME BUY

Dec 8, 2015

- 1594_PRE-PCN

arrow down

WAFER FAB

MAX9934TART+T

LAST TIME BUY

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX9934TEVKIT

Evaluation Kit for the MAX9934

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MAX9934TEVKIT

Evaluation Kit for the MAX9934

Evaluation Kit for the MAX9934

Features and Benefits

  • EV Kit Configured for Bidirectional Current Sensing Up to 1A
  • EV Kit Configured for 250V/V Gain
  • Chip-Select (CS) Logic Input
  • -0.1V to +5.5V Input Common-Mode Range
  • +2.5V to +3.6V DC Power-Supply Operation
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Detail

The MAX9934T evaluation kit (EV kit) demonstrates the MAX9934T low-voltage, precision, current-sense amplifier for power management in portable consumer electronics. The device's precision inputs and the EV kit's on-board, precision, low-value sense resistor allows the measurement of bidirectional (e.g., battery charge/discharge) currents up to 1A. Input common-mode range is -0.1V to +5.5V independent of supply. The device demonstrates a 25µA/mV fixed gain and the EV kit is configured for a 250V/V gain. The device's chip-select (CS) logic input allows users to multiplex several MAX9934T parts. The EV kit operates from a +2.5V to +3.6V, 100mA DC power supply.

The EV kit can also be used to evaluate the MAX9934F current-sense amplifier. See the Evaluating the MAX9934F section in the full data sheet for more information.

Applications

  • MP3 Players
  • Notebook PCs and Ultra-Mobile PCs
  • PDAs and Smartphones
  • Portable Current Monitoring
  • Sensor Instrumentation Amplifiers

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