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0 to 70V, High-Precision Current-Sense Amplifier

Unidirectional Automotive CSA with Most Extended Protection Immunity

Product Details

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 95
VOS @25°C (µV) (max) 12
CMVR (V) (min) 0
CMVR (V) (max) 70
VCC (V) (min) 2.7
VCC (V) (max) 5.5
ICC (µA) (typ) 700
Gain 20
Gain Accuracy @25°C (%) (max) 0.25
Oper. Temp. (°C) -40 to +125
Package/Pins TDFN-CU/8
Budgetary
Price (See Notes)
1.01
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Simplified Block Diagram

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Parameters

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 95
VOS @25°C (µV) (max) 12
CMVR (V) (min) 0
CMVR (V) (max) 70
VCC (V) (min) 2.7
VCC (V) (max) 5.5
ICC (µA) (typ) 700
Gain 20
Gain Accuracy @25°C (%) (max) 0.25
Oper. Temp. (°C) -40 to +125
Package/Pins TDFN-CU/8
Budgetary
Price (See Notes)
1.01

Key Features

  • AEC-Q100 Qualified for Automotive Applications
  • ± 0.5µV (typ) Input Offset Voltage
  • ± 0.05% (typ) Gain Error
  • 0 to +70V Input Voltage Range
  • -42V to +80V Protective Immunity
  • 65kHz, -3dB Bandwidth
  • 140dB DC CMRR
  • Gain Options: 20V/V, 50V/V
  • Rail-to-Rail Output
  • 2mm x 3mm, 8-Pin TDFN Package
  • -40°C to +125°C Automotive Temperature Range

Applications/Uses

  • Automotive Current Sensing
  • Battery Current Monitoring
  • Current Monitoring of Inductive Loads
  • High- and Low-Side Precision Current Sensing
  • Precision High-Voltage Current Monitoring
  • Solenoid Current Sensing
  • Super-Capacitor Charge/Discharge Monitoring

Description

The MAX49921 is high-precision, unidirectional current-sense amplifier (CSA) with an operating input common-mode range from 0 to +70V, though the device is protected against input common-mode voltages down to -42V and up to +80V, thus providing protection against reverse-battery and high-voltage spikes. The MAX49921 is well-suited for current monitoring of inductive loads, such as DC motors and solenoids, where common-mode voltages can become negative due to inductive kickback, reverse-battery conditions, or transient events.

The low input offset of ±0.5µV (typ) and low gain error of ± 0.05% (typ) make this device best suited for high-precision current measurements.

The MAX49921 operates from a supply voltage of +2.7V to +5.5V with a typical quiescent supply at 0.7mA. This device is specified over the full -40°C to +125°C automotive temperature range and is AEC-Q100 qualified. The MAX49921 is offered in a 2mm x 3mm, 8-pin, side-wettable TDFN package with gain options of 20V/V and 50V/V.

Simplified Block Diagram

MAX49921: Simplified Block Diagram MAX49921: Simplified Block Diagram Zoom icon

Technical Docs

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 .