MAX49925
Bidirectional, Wide Positive and Negative Sensing Range, Current-Sense Amplifier with PWM
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Overview
Features and Benefits
- 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
- Selectable Gain Options: 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
Product Details
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.
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
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Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
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MAX49925 Spice Model
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.