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Analog Devices Inc. MAX49925 Bidirectional Current-Sense Amplifiers

Analog Devices Inc. MAX49925 Bidirectional Current-Sense Amplifiers (CSA) offer an input common-mode range that extends from -40V to +76V, making them suitable for 48V hybrid electric vehicle (HEV) applications with large automotive transients. This CSA series features an extended input protection range of -42V to +80V against reverse-battery and high-voltage spikes. The wider input protection range also helps relax TVS requirements, lowering BOM cost and component size. The amplifiers are well-suited for phase-current monitoring of inductive loads, such as motors and solenoids, where pulse-width modulation (PWM) controls the drive voltage and current. 

The Analog Devices Inc. MAX49925 series uses an improved technique to help reject common-mode input PWM edges with slew rates up to and beyond 500V/μs. The amplifiers operate over a -40°C to +125°C temperature range and run from a supply voltage of +2.7V to +5.5V. The modules are available in a 3mm x 3mm, 10-pin TDFN package with side-wettable flanks.

Features

  • AEC-Q100 qualified with FMEDA available
  • Fast, 500ns PWM edge recovery from > 500V/μs PWM edges
  • 140dB DC CMRR rejection
  • -40V to +76V input voltage range
  • -42V to +80V protective immunity
  • Selectable gain options include 10V/V, 20V/V, 50V/V, and 100V/V
  • 300kHz, -3dB bandwidth
  • 5μV (typ.) input offset voltage
  • ±0.3% (max) gain error
  • Rail-to-rail output
  • 3mm x 3mm, 10-Pin TDFN with side-wettable flanks
  • -40°C to +125°C temperature range, Automotive Grade 2

Applications

  • PWM H-bridge motor in-line/in-phase/winding current sensing
  • Solenoid current sensing
  • Current monitoring of inductive loads
  • Battery stack monitors
  • High-power DC motors
  • Automotive
  • 48V HEVs

Videos

Simplified Block Diagram

Block Diagram - Analog Devices Inc. MAX49925 Bidirectional Current-Sense Amplifiers

Related Development Tool

Analog Devices Inc. MAX49925EVKIT Evaluation Kit

A fully tested and assembled circuit that demonstrates the capabilities of the MAX49925.

Learn Moreabout Analog Devices Inc. MAX49925EVKIT Evaluation Kit View Productsrelated to Analog Devices Inc. MAX49925EVKIT Evaluation Kit

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Published: 2023-03-23 | Updated: 2025-01-29