MAX9922

Ultra-Precision, High-Side Current-Sense Amplifiers

Use Autozeroing Front-End to Achieve VOS < 10µV, Allowing Small VSENSE and RSENSE


Please check latest availability status for a specific part variant.

Description

The MAX9922/MAX9923 ultra-precision, high-side current-sense amplifiers feature ultra-low offset voltage (VOS) of 25µV (max) and laser-trimmed gain accuracy better than 0.5%. The combination of low VOS and high-gain accuracy allows precise current measurements even at very small sense voltages.

The MAX9922/MAX9923 are capable of both unidirectional and bidirectional operation. For unidirectional operation, connect REF to GND. For bidirectional operation, connect REF to VDD/2.

The MAX9922 has adjustable gain set with two external resistors. The MAX9923T/MAX9923H/MAX9923F use an internal laser-trimmed resistor for fixed gain of 25V/V, 100V/V, and 250V/V, respectively. The devices operate from a +2.85V to +5.5V single supply, independent of the input common-mode voltage, and draw only 700µA operating supply current and less than 1µA in shutdown.

The +1.9V to +28V current-sense input common-mode voltage range makes the MAX9922/MAX9923 ideal for current monitoring in applications where high accuracy, large common-mode measurement range, and minimum full-scale VSENSE voltage is critical.

The MAX9922/MAX9923 use a spread-spectrum autozeroing technique that constantly measures and cancels the input offset voltage, eliminating drift over time and temperature, and the effect of 1/f noise. This, in conjunction with the indirect current-feedback technique, achieves less than 25µV (max) offset voltage.

The MAX9922/MAX9923 are available in a small 10-pin µMAX® package and are specified over the -40°C to +85°C extended temperature range.
MAX9922, MAX9923: Typical Operating Circuit MAX9922, MAX9923: Typical Operating Circuit Enlarge+

Key Features

  • Ultra-Precision VOS Over Temperature
    • MAX9922: ±10µV (max)
    • MAX9923T: ±25µV (max)
    • MAX9923H: ±20µV (max)
    • MAX9923F: ±10µV (max)
  • ±0.5% (max) Full-Scale Gain Accuracy
  • Bidirectional or Unidirectional ISENSE
  • Multiple Gains Available
    • Adjustable (MAX9922)
    • +25V/V (MAX9923T)
    • +100V/V (MAX9923H)
    • +250V/V (MAX9923F)
  • 1.9V to 28V Input Common-Mode Voltage, Independent of VDD
  • Supply Voltage: +2.85V to +5.5V
  • 700µA Supply Current, 1µA Shutdown Current
  • Extended Temperature Range (-40°C to +85°C)
  • Available in Space-Saving 10-Pin µMAX

Applications/Uses

  • Handheld Li+ Battery Current Monitoring
  • Notebook/Desktop Power Management
  • Precision Current Sources
Part NumberOutput FormatCMVR
(V)
CMVR
(V)
VCC
(V)
VCC
(V)
ICC
(µA)
Bi-Dir. Curr. SenseVSENSE_FS
(mV)
VOS @25°C
(µV)
GainGain Accuracy @25°C
(%)
BW
(kHz)
Comp-
arators
ReferenceOper. Temp.
(°C)
Package/PinsBudgetary
Price
minmaxminmaxtyprecomm.maxmax@ -3dBSee Notes
MAX9922 Voltage1.9282.855.5700Yes+/-15010Adj.0.4100External-40 to +85
UMAX/10
$1.70 @1k
MAX9923 
100 V/V
25 V/V
250 V/V
0.3
2.5
10
50
UMAX/10
$1.50 @1k
See All Current Sense Amplifiers (51)
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.


MAX9922EVKIT: Evaluation Kit for the MAX9922 and MAX9923

Tools & Models

  • MAX9922 Orcad Library
  • CAD Symbols and Footprints

  • MAX9922EUB+
  • MAX9922EUB+T
  • MAX9922EUB+TW
  • MAX9922EUB+W
  • 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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