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.
The MAX49925 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. It 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.
Key Features and Benefits
- 500 ns recovery time increases PWM frequency and reduces motor size
- High common-mode voltage range of -40V to +76V covers higher supply voltage
- Selectable gain options (10V/V, 20V/V, 50V/V, 100V/V) increase dynamic range and accuracy
- 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
- 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 HEV
Evaluation Board
The MAX49925 can be evaluated with the MAX49925EVKIT#.
Block Diagrams and Tables
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