MAX9918, MAX9919, MAX9920 -20V至+75V輸入范圍、高精度單/雙向電流檢測放大器

概述

The MAX9918/MAX9919/MAX9920 are single-supply, high-accuracy current-sense amplifiers with a high input common-mode range that extends from -20V to +75V. These amplifiers are well suited for current monitoring of inductive loads such as motors and solenoids, where common-mode voltages can become negative due to inductive kickback, reverse-battery conditions, or transient events.

The MAX9918/MAX9920 feature adjustable gain set by an external resistive-divider network. The MAX9919 features fixed gains of 45V/V (MAX9919F) and 90V/V (MAX9919N). The MAX9918/MAX9919/MAX9920 operate as unidirectional amplifiers when V_REFIN = GND and as bidirectional amplifiers when V_REFIN = V_CC/2. The MAX9920 attenuates the input signal by a factor of 4 at the input level shifting stage allowing the device to sense voltages up to 200mV (unidirectional operation) or ±100mV (bidirectional operation).

The MAX9918/MAX9919/MAX9920 operate with a single 5V supply voltage are fully specified over the -40°C to +125°C automotive temperature range, and are available in an 8-pin SOIC package.

關鍵特性

-20V to +75V Input Common-Mode Voltage Range
400μV (max) Input Offset Voltage
0.6% (max) Gain Accuracy Error
Uni- or Bidirectional Current Sensing
Reference Input for Bidirectional OUT
120kHz, -3dB Bandwidth (MAX9919N)
Single-Supply Operation (4.5V to 5.5V)
1mA Supply Current
0.5μA (typ) Shutdown Current
Rail-to-Rail Output
-40°C to +125°C Automotive Temperature Range?

應用/使用

?4x4傳輸控制
?電感負載電流監測
?電子節氣門控制
?H橋接電機電流檢測
?高邊、低邊高精度電流檢測
?精密的高壓電流監測
?螺線管電流檢測
?混合動力車中超級電容的充電/放電監測

MAX9918, MAX9919, MAX9920,pdf datasheet

Typical Operating Circuit