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nanoPower, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier

Industry's Smallest Current-Sense Amplifier: 1mm x 1mm with ICC < 1µA, VOS < 500µV, Gain Error < 0.5%

Product Details

Key Features

Applications/Uses

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 25
50
100
VOS @25°C (µV) (max) 500
Output Format Voltage
CMVR (V) (min) 1.6
CMVR (V) (max) 28
VCC (V) (min) 1.6
VCC (V) (max) 28
ICC (µA) (typ) 1
Bi-Dir. Curr. Sense No
Gain 100 V/V
200 V/V
25 V/V
50 V/V
Gain Accuracy @25°C (%) (max) 0.5
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/5
UCSP (B)/4
UDFN/6
Budgetary
Price (See Notes)
0.72
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Simplified Block Diagram

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Parameters

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 25
50
100
VOS @25°C (µV) (max) 500
Output Format Voltage
CMVR (V) (min) 1.6
CMVR (V) (max) 28
VCC (V) (min) 1.6
VCC (V) (max) 28
ICC (µA) (typ) 1
Bi-Dir. Curr. Sense No
Gain 100 V/V
200 V/V
25 V/V
50 V/V
Gain Accuracy @25°C (%) (max) 0.5
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/5
UCSP (B)/4
UDFN/6
Budgetary
Price (See Notes)
0.72

Key Features

  • Ultra-Low Supply Current of 1µA (max)
  • Low 500µV (max) Input Offset Voltage
  • Low < 0.5% (max) Gain Error
  • Input Common Mode: +1.6V to +28V
  • Voltage Output
  • Four Gain Versions Available
    • +25V/V (MAX9938T)
    • 50V/V (MAX9938F)
    • 100V/V (MAX9938H)
    • 200V/V (MAX9938W)
  • Tiny 1mm x 1mm x 0.6mm, 4-Bump UCSP, 5-Pin SOT23, or 2mm x 2mm x 0.8mm, 6-Pin µDFN Packages

Applications/Uses

  • Cell Phones
  • Notebook Computers
  • PDAs
  • Portable/Battery-Powered Systems
  • Power Management Systems

Description

The MAX9938 high-side current-sense amplifier offers precision accuracy specifications of VOS less than 500µV (max) and gain error less than 0.5% (max). Quiescent supply current is an ultra-low 1µA. The MAX9938 fits in a tiny, 1mm x 1mm UCSP™ package size or a 5-pin SOT23 package, making the part ideal for applications in notebook computers, cell phones, PDAs, and all battery-operated portable devices where accuracy, low quiescent current, and small size are critical.

The MAX9938 features an input common-mode voltage range from 1.6V to 28V. These current-sense amplifiers have a voltage output and are offered in four gain versions: 25V/V (MAX9938T), 50V/V (MAX9938F), 100V/V (MAX9938H), and 200V/V (MAX9938W).

The four gain selections offer flexibility in the choice of the external current-sense resistor. The very low 500µV (max) input offset voltage allows small 25mV to 50mV full-scale VSENSE voltage for very low voltage drop at full-current measurement.

The MAX9938 is offered in tiny 4-bump, UCSP (1mm x 1mm x 0.6mm footprint), 5-pin SOT23, and 6-pin µDFN (2mm x 2mm x 0.8mm) packages specified for operation over the -40°C to +85°C extended temperature range.

Simplified Block Diagram

MAX9938: Typical Operating Circuit MAX9938: 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 .