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主要特征
应用/用途
| 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 |
简化框图
技术文档
| 数据资料 | 0 to 70V, High-Precision Current-Sense Amplifier | Dec 21, 2020 |
参量
| 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 |
主要特征
- 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
应用/用途
- 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
描述
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.
技术文档
| 数据资料 | 0 to 70V, High-Precision Current-Sense Amplifier | Dec 21, 2020 |
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