MAX4372T_09 Datasheet, PDF (1/11 Pages) Maxim Integrated Products – Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output

19-1548; Rev 4; 7/09
Low-Cost, UCSP/SOT23, Micropower, High-Side
Current-Sense Amplifier with Voltage Output
General Description
The MAX4372 low-cost, precision, high-side current-
sense amplifier is available in a tiny, space-saving
SOT23-5-pin package. Offered in three gain versions
(T = 20V/V, F = 50V/V, and H = 100V/V), this device
operates from a single 2.7V to 28V supply and con-
sumes only 30µA. It features a voltage output that elimi-
nates the need for gain-setting resistors and is ideal for
today’s notebook computers, cell phones, and other
systems where battery/DC current monitoring is critical.
High-side current monitoring is especially useful in bat-
tery-powered systems since it does not interfere with
the ground path of the battery charger. The input com-
mon-mode range of 0 to 28V is independent of the sup-
ply voltage and ensures that the current-sense
feedback remains viable even when connected to a
2-cell battery pack in deep discharge.
The user can set the full-scale current reading by
choosing the device (T, F, or H) with the desired volt-
age gain and selecting the appropriate external sense
resistor. This capability offers a high level of integration
and flexibility, resulting in a simple and compact cur-
rent-sense solution. For higher bandwidth applications,
refer to the MAX4173T/F/H data sheet.
Applications
Power-Management Systems
General-System/Board-Level Current Monitoring
Notebook Computers
Portable/Battery-Powered Systems
Smart-Battery Packs/Chargers
Cell Phones
Precision-Current Sources
Features
o Low-Cost, Compact Current-Sense Solution
o 30µA Supply Current
o 2.7V to 28V Operating Supply
o 0.18% Full-Scale Accuracy
o 0.3mV Input Offset Voltage
o Low 1.5Ω Output Impedance
o Three Gain Versions Available
20V/V (MAX4372T)
50V/V (MAX4372F)
100V/V (MAX4372H)
o High Accuracy +2V to +28V Common-Mode
Range, Functional Down to 0V, Independent of
Supply Voltage
o Available in a Space-Saving 5-Pin SOT23 Package
and 3 x 2 UCSP™ (1mm x 1.5mm) Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
TOP
MARK
MAX4372TEUK-T -40°°C to +85°°C 5 SOT23-5
ADIU
MAX4372TESA -40°^°C to +85°^°C 8 SO
—
MAX4372TEBT-T -40°^°C to +85°^°C 3 x 2 UCSP
ACX
Note: Gain values are as follows: 20V/V for the T version, 50V/V
for the F version, and 100V/V for the H version.
Ordering Information continued at end of datasheet.
Typical Operating Circuit
I_LOAD
Pin Configurations
TOP VIEW
TOP VIEW
(BUMPS ON BOTTOM)
GND 1
5 RS-
1
2
3
A
MAX4372T/F/H
OUT 2
V_{CC 3}
B
4 RS+
V_CC
GND
OUT
MAX4372T/F/H
RS+
RS-
SOT23-5
UCSP
Pin Configurations continued at end of datasheet.
GND
RS-
A/D
CONVERTER
MAX4372T/F/H
OUT
R_SENSE
V_SENSE
LOAD/
BATTERY
V_CC
+2.7V TO +28V
V_CC
0.1μF
RS+
V_IN
0 TO 28V
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.