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Ultra-Precision, High-Side Current-Sense Amplifiers

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

Product Details

Key Features

Applications/Uses

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) +/-150
VOS @25°C (µV) (max) 10
Output Format Voltage
CMVR (V) (min) 1.9
CMVR (V) (max) 28
VCC (V) (min) 2.85
VCC (V) (max) 5.5
ICC (µA) (typ) 700
Bi-Dir. Curr. Sense Yes
Gain Adj.
Gain Accuracy @25°C (%) (max) 0.4
Oper. Temp. (°C) -40 to +85
Package/Pins UMAX/10
Budgetary
Price (See Notes)
1.9
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Simplified Block Diagram

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Parameters

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) +/-150
VOS @25°C (µV) (max) 10
Output Format Voltage
CMVR (V) (min) 1.9
CMVR (V) (max) 28
VCC (V) (min) 2.85
VCC (V) (max) 5.5
ICC (µA) (typ) 700
Bi-Dir. Curr. Sense Yes
Gain Adj.
Gain Accuracy @25°C (%) (max) 0.4
Oper. Temp. (°C) -40 to +85
Package/Pins UMAX/10
Budgetary
Price (See Notes)
1.9

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

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.

Simplified Block Diagram

MAX9922, MAX9923: Typical Operating Circuit MAX9922, MAX9923: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .