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MAX9918, MAX9919, MAX9920
-20V to +75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers
Current-Sense Amplifiers with Input Common Range that Extends Well Below Ground (-20V)
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Status
Active: In Production.
Description
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 VREFIN = GND and as bidirectional amplifiers when VREFIN = VCC/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.
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Data Sheet
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An evaluation kit is available: MAX9918EVKIT
Key Features
- -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
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Applications/Uses
- 4x4 Transmission Control
- Current Monitoring of Inductive Loads
- Electronic Throttle Control
- H-Bridge Motor Current Sensing
- High- and Low-Side Precision Current Sensing
- Precision High-Voltage Current Monitoring
- Solenoid Current Sensing
- Super-Capacitor Charge/Discharge Monitoring in Hybrid Cars
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Key Specifications:
| Current Sense Amplifiers |
| Part Number |
CMVR
(V) |
CMVR
(V) |
VCC
(V) |
VCC
(V) |
ICC
(µA) |
Bi-Dir. Curr. Sense |
VSENSE_FS
(mV) |
VOS @25°C
(µV) |
Gain |
Gain Accuracy @25°C
(%) |
BW
(kHz) |
Comp-
arators |
Oper. Temp.
(°C) |
Package/Pins |
Budgetary Price |
| min |
max |
min |
max |
typ |
recomm. |
max |
max |
@ -3dB |
See Notes |
| MAX9918 |
-20 |
75 |
4.5 |
5.5 |
1000 |
Yes |
50 |
400 |
Adj. |
0.6 |
75 |
0 |
-40 to +125 |
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$0.94 @1k |
| MAX9919 |
50 |
400 |
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0.45 |
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- |
| MAX9920 |
200 |
1200 |
Adj. |
1 |
230 |
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- |
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See All Current Sense Amplifiers (36)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
More Information
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Information Index
Document Ref.: 19-5015
Rev 4;
2011-08-09
This page last modified: 2011-08-09
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