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MAX4173, MAX4173F, MAX4173H, MAX4173T
Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier
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Status
Active: In Production.
Description
The MAX4173 low-cost, precision, high-side current-sense amplifier is available in a tiny SOT23-6 package. It features a voltage output that eliminates the need for gain-setting resistors and it is ideal for today's notebook computers, cell phones, and other systems where current monitoring is critical. High-side current monitoring is especially useful in battery-powered systems, since it does not interfere with the ground path of the battery charger. The input common-mode range of 0 to +28V is independent of the supply voltage and ensures that the current-sense feedback remains viable even when connected to a battery in deep discharge. The MAX4173's wide 1.7MHz bandwidth makes it suitable for use inside battery charger control loops.
The combination of three gain versions and a user-selectable external sense resistor sets the full-scale current reading. This feature offers a high level of integration, resulting in a simple and compact current-sense solution.
The MAX4173 operates from a single +3V to +28V supply, typically draws only 420µA of supply current over the extended operating temperature range (-40°C to +85°C), and is offered in the space-saving SOT23 package.
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Data Sheet
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An evaluation kit is available: MAX4173EVKIT
Key Features
- Low-Cost, Compact Current-Sense Solution
- High Accuracy +2V to +28V Common-Mode Range, Functional Down to 0V, Independent of Supply Voltage
- Three Gain Versions Available
- +20V/V (MAX4173T)
- +50V/V (MAX4173F)
- +100V/V (MAX4173H)
- ±0.5% Full-Scale Accuracy
- ±3mV Input Offset Voltage (MAX4173T)
- Wide 1.7MHz Bandwidth (MAX4173T)
- 420µA Supply Current
- Available in Space-Saving SOT23 Package
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Applications/Uses
- Cell Phones
- General System/Board-Level Current Monitoring
- Notebook Computers
- PA Bias Control
- Portable Battery-Powered Systems
- Power-Management Systems
- Precision Current Sources
- Smart Battery Packs/Chargers
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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 |
| MAX4173 |
0 |
28 |
3 |
28 |
420 |
No |
150 |
3000 |
|
2.5 |
|
0 |
-40 to +85 |
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$0.83 @1k |
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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
Notes and Comments
Low-Cost, precision, voltage-output current-sense amplifier
More Information
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Information Index
Document Ref.: 19-1434
Rev 5;
2011-04-25
This page last modified: 2011-04-25
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