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MAX9922EUB+

P1-P3P4-P6P7-P9P10-P12P13-P15
General Description
The MAX9922/MAX9923 ultra-precision, high-side cur-
rent-sense amplifiers feature ultra-low offset voltage
(V
OS
) of 25µV (max) and laser-trimmed gain accuracy
better than 0.5%. The combination of low V
OS
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 V
DD
/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 V
SENSE
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
Features
♦ Ultra-Precision V
OS
Over Temperature
MAX9922: ±10µV (max)
MAX9923T: ±25µV (max)
MAX9923H: ±20µV (max)
MAX9923F: ±10µV (max)
♦ ±0.5% (max) Full-Scale Gain Accuracy
♦ Bidirectional or Unidirectional I
SENSE
♦ Multiple Gains Available
Adjustable (MAX9922)
+25V/V (MAX9923T)
+100V/V (MAX9923H)
+250V/V (MAX9923F)
♦ 1.9V to 28V Input Common-Mode Voltage,
Independent of V
DD
♦ 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
MAX9922/MAX9923
Ultra-Precision, High-Side
Current-Sense Amplifiers
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-4429; Rev 1; 1/10
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.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
EVALUATION KIT
AVAILABLE
PART
PIN-
PACKAGE
TEMP
RANGE
GAIN (V/V)
MAX9922EUB+
10 µMAX
- 40°C to + 85° C
Adjustable
MAX9923TEUB+
10 µMAX
- 40°C to + 85° C
25
MAX9923HEUB+
10 µMAX
- 40°C to + 85° C
100
MAX9923FEUB+
10 µMAX
- 40°C to + 85° C
250
Pin Configuration
1
2
3
4
5
10
9
8
7
6
V
DD
OUT
FB
REFN.C.
RS-
RS+
RSB
MAX9922
MAX9923T
MAX9923H
MAX9923F
µMAX
TOP VIEW
GND
SHDN
+
Typical Operating Circuits appear at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX9922/MAX9923
Ultra-Precision, High-Side
Current-Sense Amplifiers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
RSB
= V
RS+
= V
RS-
=
+12V, V
DD
= +3.3V, V
GND
= 0V, V
REF
= V
DD
/2 for bidirectional, V
REF
= 0V for unidirectional, V
SENSE
= V
RS+
- V
RS-
=
0V, MAX9922 is set for A
V
=100V/V (R1 = 1kΩ, R2 = 99kΩ), SHDN = V
DD
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values
are at T
A
= +25°C.) (Note 1)
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.
RSB, RS+, RS- to GND...........................................-0.3V to +30V
V
DD
to GND..............................................................-0.3V to +6V
OUT, REF, FB, SHDN
to GND .................-0.3V to the lower of (V
DD
+ 0.3V) and +6V
OUT Short Circuit to V
DD
or GND ..............................Continuous
Differential Voltage (V
RS+
- V
RS-
), (V
RSB
- V
RS+
),
(V
RSB
- V
RS-
) ...................................................................±5.5V
Current into Any Pin..........................................................±20mA
Continuous Power Dissipation (T
A
= +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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC CHARACTERISTICS
MAX9922 (A
V
= 100), V
SENSE
= 0V,
V
REF
= V
DD
/2, -40°C ≤ T
A
≤ +85°C
±0.1 ±10
MAX9923T, V
SENSE
= 0V, V
REF
= V
DD
/2,
-40°C ≤ T
A
≤ +85°C
±0.2 ±25
MAX9923H, V
SENSE
= 0V, V
REF
= V
DD
/2
-40°C ≤ T
A
≤ +85°C
±0.2 ±20
Input Offset Voltage
(Notes 2, 3)
V
OS
MAX9923F, V
SENSE
= 0V, V
REF
= V
DD
/2,
-40°C ≤ T
A
≤ +85°C
±0.1 ±10
µV
MAX9922 (A
V
= 100V/V), V
SENSE
= 0V,
V
REF
= V
DD
/2, -40°C ≤ T
A
≤ +85°C
±0.05
MAX9923T, V
SENSE
= 0V, V
REF
= V
DD
/2,
-40°C ≤ T
A
≤ +85°C
±0.20
MAX9923H, V
SENSE
= 0V, V
REF
= V
DD
/2,
-40°C ≤ T
A
≤ +85°C
±0.10
Input Offset Voltage
Temperature Drift (Notes 2, 4)
TCV
OS
MAX9923F, V
SENSE
= 0V, V
REF
= V
DD
/2,
-40°C ≤ T
A
≤ +85°C
±0.05
µV/°C
Input Common-Mode Range V
CMR
Guaranteed by CMRR 1.90 28.00 V
Input Common-Mode Rejection CMRR
1.9V ≤ V
RS+
≤ 28V, -40°C ≤ T
A
≤ +85°C
(Note 2)
121 140 dB
MAX9922 Adj
MAX9923T 25
MAX9923H 100
Gain
A
V
MAX9923F 250
V/V
MAX9922/MAX9923
Ultra-Precision, High-Side
Current-Sense Amplifiers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
RSB
= V
RS+
= V
RS-
=
+12V, V
DD
= +3.3V, V
GND
= 0V, V
REF
= V
DD
/2 for bidirectional, V
REF
= 0V for unidirectional, V
SENSE
= V
RS+
- V
RS-
=
0V, MAX9922 is set for A
V
=100V/V (R1 = 1kΩ, R2 = 99kΩ), SHDN = V
DD
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values
are at T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
T
A
= +25°C ±0.17 ±0.40
MAX9922
(A
V
= 100)
-40°C ≤ T
A
≤ +85°C ±0.60
T
A
= +25°C ±0.12 ±0.30
MAX9923T
-40°C ≤ T
A
≤ +85°C ±0.60
T
A
= +25°C ±0.24 ±0.40
MAX9923H
-40°C ≤ T
A
≤ +85°C ±0.75
T
A
= +25°C ±0.21 ±0.50
Gain Accuracy
(Note 5)
∆A
V
MAX9923F
-40°C ≤ T
A
≤ +85°C ±0.80
%
MAX9922 (A
V
= 100) ±0.06
MAX9923T
±0.04
MAX9923H
±0.06
Gain Nonlinearity ~A
V
MAX9923F
±0.12
%
Open-Loop Gain A
VOL
MAX9922 160 dB
Input Bias Current I
RS+
,
I
RS-
1pA
FB Bias Current I
FB
MAX9922 1 pA
FB Resistance R
FB
MAX9923T/MAX9923H/MAX9923F resistance
between FB and REF
1kΩ
T
A
= +25°C0
V
DD
-
1.4
REF Input Range
Guaranteed by REF
CMRR test
-40°C ≤ T
A
≤ +85°C0
V
DD
-
1.6
V
REF Common-Mode Rejection
Ratio
0 ≤ REF ≤ V
DD
- 1.4V (Note 2) 94 100 dB
MAX9922 (bidirectional) ±20
MAX9923T (bidirectional) ±60 ±70
MAX9923H (bidirectional) ±16 ±20
REF Input Current
(Note 6)
MAX9923F (bidirectional) ±6 ±7
µA
R
L
= 10kΩ to GND
and REF = GND
730
OUT High Voltage V
OH
V
OH
= V
DD
– V
OUT
(Note 7)
R
L
= 10kΩ to V
DD
and REF = V
DD
- 1.4
16
mV
R
L
= 10kΩ to GND and REF = GND 1 10
OUT Low Voltage (Note 7) V
OL
R
L
= 10kΩ to V
DD
and REF = V
DD
- 1.4 6 30
mV
SHDN Logic-Low V
IL
V
DD
= 5.5V 0.3 V
SHDN Logic-High V
IH
V
DD
= 5.5V
0.6 x
V
DD
V
SHDN Input Current I
IH
/I
IL
0.001 ±1 µA
P1-P3P4-P6P7-P9P10-P12P13-P15

MAX9922EUB+

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Manufacturer:
Maxim Integrated
Description:
Current Sense Amplifiers Current-Sense Amplifier
Lifecycle:
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