MAX4378

Single/Dual/Quad High-Side Current-Sense Amplifiers with Internal Gain

Industry's-First SOT23 High-Side Current-Sense Amplifier with Buffered Output


Please check latest availability status for a specific part variant.

Description

The MAX4376/MAX4377/MAX4378 single, dual, and quad precision high-side current-sense amplifiers are available in space-saving packages. They feature buffered voltage outputs that eliminate the need for gain-setting resistors and are ideal for today's notebook computers, cell phones, and other systems where current monitoring is critical. These precision devices are offered in three fixed-gain versions of 20, 50, and 100:
GAIN SUFFIX
20 T
50 F
100 H

For example, MAX4376TAUK is a single high-side amplifier with a gain of 20.

High-side current monitoring is especially useful in battery-powered systems since it does not interfere with the ground path of the battery charger. The input common-mode range of 0 to +28V is independent of the supply voltage and ensures that the current-sense feedback remains viable even when connected to a battery pack in deep discharge.

The full-scale current reading can be set by choosing the appropriate voltage gain and external-sense resistor. This capability offers a high level of integration and flexibility, resulting in a simple and compact current-sense solution.

The MAX4376/MAX4377/MAX4378 operate over a supply voltage range of +3V to +28V, draw 1mA of supply current per amplifier, and operate over the full automotive temperature range of -40°C to +125°C. These devices have a wide bandwidth of 2MHz, making them suitable for use inside battery-charger control loops. The buffered outputs drive up to 2mA of output current into a ground-referenced load.

The MAX4376 is available in a tiny 5-pin SOT23 package. The MAX4377/MAX4378 are available in space-saving 8-pin µMAX® and 14-pin TSSOP packages, respectively.
MAX4376, MAX4377, MAX4378: Pin Configuration MAX4376, MAX4377, MAX4378: Pin Configuration Enlarge+

Key Features

  • Low-Cost Single/Dual/Quad High-Side Current-Sense Amplifiers
  • ±0.5% Typical Full-Scale Accuracy
  • +3V to +28V Supply Operation
  • Adjustable Current-Sense Capability with External Sense Resistor
  • Buffered Output Voltage with 2mA Drive
  • 1mA (typ) Supply Current
  • 2.0MHz Bandwidth (Gain = +20V/V)
  • Automotive Temperature Range (-40°C to +125°C)
  • High Accuracy +2V to +28V Common-Mode Range, Functional Down to 0V, Independent of Supply Voltage
  • Three Gain Versions Available
    • +20V/V (MAX437_T)
    • +50V/V (MAX437_F)
    • +100V/V (MAX437_H)
  • Available in Space-Saving 5-pin SOT23 (Single), 8-pin µMAX (Dual), and 14-pin TSSOP (Quad)
  • AEC-Q100 Qualified, Refer to Ordering Information for the List of /V Parts

Applications/Uses

  • Automotive
  • Automotive Current Detect
  • Battery Chargers
  • Cell Phones
  • Current-Limited Power Supplies
  • Fuel Gauges in PC
  • General-System/Board-Level Current Monitoring
  • Notebook Computers
  • PA Bias Control
  • Portable/Battery-Powered Systems
  • Power-Management Systems
  • Smart Battery Packages
Part NumberOutput FormatCMVR
(V)
CMVR
(V)
VCC
(V)
VCC
(V)
ICC
(µA)
Bi-Dir. Curr. SenseVSENSE_FS
(mV)
GainGain Accuracy @25°C
(%)
BW
(kHz)
Comp-
arators
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
minmaxminmaxtyprecomm.max@ -3dBSee Notes
MAX4376 Voltage0283281000No150
100 V/V
20 V/V
50 V/V
2.5
1200
1700
2000
0-40 to +125
SOIC (N)/8
SOT23/5
$0.92 @1k
MAX4377 
SOIC (N)/8
UMAX/8
$1.34 @1k
MAX4378 
SOIC (N)/14
TSSOP/14
$1.46 @1k
See All Current Sense Amplifiers (52)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

CAD Symbols and Footprints

  • MAX4378FASD+
  • MAX4378FASD+T
  • MAX4378FAUD+
  • MAX4378FAUD+T
  • MAX4378HASD+
  • MAX4378HASD+T
  • MAX4378HAUD+
  • MAX4378HAUD+T
  • MAX4378TASD+
  • MAX4378TASD+T
  • MAX4378TAUD+
  • MAX4378TAUD+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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