MAX49925 Datasheet

• 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
• 300kHz, -3dB Bandwidth
• On-the-fly Programmable Gain with two input pins: 10V/V, 20V/V, 50V/V, 100V/V
• 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
• AEC-Q100 Qualified

• 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 Hybrid and Electric Vehicles (HEV)

The MAX49925 is a bidirectional current-sense amplifier (CSA) with an input common-mode range that extends from -40V to +76V, making it suitable for 48V HEV applications where there are large automotive transients.

This CSA has 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, leading to lower BOM cost and reduced component size.

The MAX49925 is well-suited for phase-current monitoring of inductive loads, such as motors and solenoids, where pulse-width modulation (PWM) is used to control the drive voltage and current.

The MAX49925 uses an improved technique to help reject common-mode input PWM edges with slew rates up to and beyond 500V/μs.

The MAX49925 operates over the full -40°C to +125°C temperature range and runs from a supply voltage of +2.7V to +5.5V. It is available in a 3mm x 3mm, 10-pin TDFN package with side-wettable flanks.