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-0.1V to +28V Input Range, Micropower, Uni-/Bidirectional, Current-Sense Amplifiers

Ultra-Small, 6-Bump UCSP Current-Sense Amplifiers with True -0.1V to +28V Input Range

Product Details

Key Features

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) +/-125
+/-50
VOS @25°C (µV) (max) 400
Output Format Voltage
CMVR (V) (min) -0.1
CMVR (V) (max) 28
VCC (V) (min) 2.5
VCC (V) (max) 5.5
ICC (µA) (typ) 20
Bi-Dir. Curr. Sense Yes
Gain 50 V/V
Gain Accuracy @25°C (%) (max) 1
Oper. Temp. (°C) -40 to +125
Package/Pins UCSP (B)/6
UMAX/8
Budgetary
Price (See Notes)
0.99
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Simplified Block Diagram

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Parameters

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) +/-125
+/-50
VOS @25°C (µV) (max) 400
Output Format Voltage
CMVR (V) (min) -0.1
CMVR (V) (max) 28
VCC (V) (min) 2.5
VCC (V) (max) 5.5
ICC (µA) (typ) 20
Bi-Dir. Curr. Sense Yes
Gain 50 V/V
Gain Accuracy @25°C (%) (max) 1
Oper. Temp. (°C) -40 to +125
Package/Pins UCSP (B)/6
UMAX/8
Budgetary
Price (See Notes)
0.99

Key Features

  • Wide -0.1V to +28V Common-Mode Range, Independent of Supply Voltage
  • 2.5V to 5.5V Operating Supply Voltage
  • 20µA Quiescent Supply Current
  • 0.4mV (max) Input Offset Voltage
  • Gain Accuracy Better than 1% (max)
  • SIGN Output Indicates Current Polarity
  • Transconductance and Gain Versions Available
    • 5µA/mV (MAX9928F)
    • 50V/V (MAX9929F)
  • Pin Compatible with the MAX4372 in UCSP
  • Available in Ultra-Small, 3x2 UCSP (1mm x 1.5mm) and 8-Pin µMAX Packages

Applications/Uses

  • General-System/Board-Level Current Monitoring
  • Monitoring Charge/Discharge Currents in Portable/Battery-Powered Systems
  • Notebook Computers
  • Precision Current Sources
  • Smart-Battery Packs/Chargers
  • Smart-Cell Phones
  • Super Capacitor Charge/Discharge

Description

The MAX9928F/MAX9929F low-cost, uni-/bidirectional, high-side, current-sense amplifiers are ideal for monitoring battery charge and discharge currents in notebooks, cell phones, and other portable equipment. These devices feature a wide -0.1V to +28V input common-mode voltage range, low 20µA supply current with VOS less than 0.4mV, and a gain accuracy better than 1.0%. The input common-mode range is independent of the supply voltage, ensuring that the current-sense information remains accurate even when the measurement rail is shorted to ground.

The MAX9928F features a current output with a transconductance ratio of 5μA/mV. An external resistor converts the output current to a voltage, allowing adjustable gain so that the input sense voltage can be matched to the maximum ADC input swing. The MAX9929F has a voltage output and integrates a 10kΩ output resistor for a fixed voltage gain of 50V/V.

A digital SIGN output indicates direction of current flow, so the user can utilize the full ADC input range for measuring both charging and discharging currents.

The MAX9928F/MAX9929F are fully specified over the -40°C to +125°C automotive temperature range, and available in 6-bump UCSP™ (1mm x 1.5mm) and 8-pin µMAX® packages. The UCSP package is bump-to-bump compatible with the MAX4372_EBT.

Simplified Block Diagram

MAX9928, MAX9929: Typical Operating Circuit MAX9928, MAX9929: 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 .