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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9923 Datasheet

(MAX9922 / MAX9923) High-Side Current-Sense Amplifiers

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19-4429; Rev 1; 1/10
EVAALVUAAILTAIOBNLEKIT
Ultra-Precision, High-Side
Current-Sense Amplifiers
General Description
The MAX9922/MAX9923 ultra-precision, high-side cur-
rent-sense amplifiers feature ultra-low offset voltage
(VOS) of 25µV (max) and laser-trimmed gain accuracy
better than 0.5%. The combination of low VOS and high-
gain accuracy allows precise current measurements
even at very small sense voltages.
The MAX9922/MAX9923 are capable of both unidirec-
tional and bidirectional operation. For unidirectional
operation, connect REF to GND. For bidirectional oper-
ation, connect REF to VDD/2.
The MAX9922 has adjustable gain set with two external
resistors. The MAX9923T/MAX9923H/MAX9923F use an
internal laser-trimmed resistor for fixed gain of 25V/V,
100V/V, and 250V/V, respectively. The devices operate
from a +2.85V to +5.5V single supply, independent
of the input common-mode voltage, and draw only 700µA
operating supply current and less than 1µA in shutdown.
The +1.9V to +28V current-sense input common-mode
voltage range makes the MAX9922/MAX9923 ideal for
current monitoring in applications where high accuracy,
large common-mode measurement range, and mini-
mum full-scale VSENSE voltage is critical.
The MAX9922/MAX9923 use a spread-spectrum
autozeroing technique that constantly measures and
cancels the input offset voltage, eliminating drift over
time and temperature, and the effect of 1/f noise. This,
in conjunction with the indirect current-feedback tech-
nique, achieves less than 25µV (max) offset voltage.
The MAX9922/MAX9923 are available in a small 10-pin
µMAX® package and are specified over the -40°C to
+85°C extended temperature range.
Applications
Notebook/Desktop Power Management
Handheld Li+ Battery Current Monitoring
Precision Current Sources
Typical Operating Circuits appear at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Features
Ultra-Precision VOS Over Temperature
MAX9922: ±10µV (max)
MAX9923T: ±25µV (max)
MAX9923H: ±20µV (max)
MAX9923F: ±10µV (max)
±0.5% (max) Full-Scale Gain Accuracy
Bidirectional or Unidirectional ISENSE
Multiple Gains Available
Adjustable (MAX9922)
+25V/V (MAX9923T)
+100V/V (MAX9923H)
+250V/V (MAX9923F)
1.9V to 28V Input Common-Mode Voltage,
Independent of VDD
Supply Voltage: +2.85V to +5.5V
700µA Supply Current, 1µA Shutdown Current
Extended Temperature Range (-40°C to +85°C)
Available in Space-Saving 10-Pin µMAX
Ordering Information
PART
MAX9922EUB+
PIN-
PACKAGE
10 µMAX
TEMP
RANGE
-40°C to +85°C
GAIN (V/V)
Adjustable
MAX9923TEUB+ 10 µMAX
MAX9923HEUB+ 10 µMAX
-40°C to +85°C
-40°C to +85°C
25
100
MAX9923FEUB+ 10 µMAX -40°C to +85°C
250
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
TOP VIEW
RSB 1 +
RS+ 2
RS- 3
N.C. 4
GND 5
MAX9922
MAX9923T
MAX9923H
MAX9923F
10 VDD
9 OUT
8 FB
7 REF
6 SHDN
µMAX
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9923 Datasheet

(MAX9922 / MAX9923) High-Side Current-Sense Amplifiers

No Preview Available !

Ultra-Precision, High-Side
Current-Sense Amplifiers
ABSOLUTE MAXIMUM RATINGS
RSB, RS+, RS- to GND...........................................-0.3V to +30V
VDD to GND ..............................................................-0.3V to +6V
OUT, REF, FB, SHDN
to GND .................-0.3V to the lower of (VDD + 0.3V) and +6V
OUT Short Circuit to VDD or GND ..............................Continuous
Differential Voltage (VRS+ - VRS-), (VRSB - VRS+),
(VRSB - VRS-) ...................................................................±5.5V
Current into Any Pin..........................................................±20mA
Continuous Power Dissipation (TA = +70°C)
10-Pin µMAX (derate 4.5mW/°C above +70°C) ...........362mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VRSB = VRS+ = VRS- = +12V, VDD = +3.3V, VGND = 0V, VREF = VDD/2 for bidirectional, VREF = 0V for unidirectional, VSENSE = VRS+ - VRS-
= 0V, MAX9922 is set for AV =100V/V (R1 = 1k, R2 = 99k), SHDN = VDD, TA = -40°C to +85°C, unless otherwise noted. Typical values
are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
DC CHARACTERISTICS
MAX9922 (AV = 100), VSENSE = 0V,
VREF = VDD/2, -40°C TA +85°C
±0.1 ±10
Input Offset Voltage
(Notes 2, 3)
MAX9923T, VSENSE = 0V, VREF = VDD/2,
-40°C TA +85°C
VOS MAX9923H, VSENSE = 0V, VREF = VDD/2
-40°C TA +85°C
±0.2 ±25
±0.2 ±20
µV
MAX9923F, VSENSE = 0V, VREF = VDD/2,
-40°C TA +85°C
±0.1 ±10
MAX9922 (AV = 100V/V), VSENSE = 0V,
VREF = VDD/2, -40°C TA +85°C
±0.05
Input Offset Voltage
Temperature Drift (Notes 2, 4)
Input Common-Mode Range
Input Common-Mode Rejection
Gain
TCVOS
VCMR
CMRR
AV
MAX9923T, VSENSE = 0V, VREF = VDD/2,
-40°C TA +85°C
MAX9923H, VSENSE = 0V, VREF = VDD/2,
-40°C TA +85°C
MAX9923F, VSENSE = 0V, VREF = VDD/2,
-40°C TA +85°C
Guaranteed by CMRR
1.9V VRS+ 28V, -40°C TA +85°C
(Note 2)
MAX9922
MAX9923T
MAX9923H
MAX9923F
±0.20
±0.10
µV/°C
1.90
121
±0.05
28.00
V
140 dB
Adj
25
V/V
100
250
2 _______________________________________________________________________________________


Part Number MAX9923
Description (MAX9922 / MAX9923) High-Side Current-Sense Amplifiers
Maker Maxim Integrated Products
Total Page 15 Pages
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