Datasheet
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MAX34406
Quad Current-Sense Amplifier
with Overcurrent Threshold Comparators
R
IN
x I
BIAS
contributes to the input voltage offset. I
BIAS
is typically 0.2FA.
Placing R
IN
at the INx- input voltage does not affect the
gain error of the device because the gain is given by the
ratio between R
OUTx
and R1 at INx+.
Bidirectional Application
Some systems can require a precise bidirectional cur-
rent-sense amplifier to accurately monitor currents.
Measurement of the two separate outputs with respect
to GND yields an accurate measure of the bidirectional
currents (Figure 3).
Choosing the Delay Capacitor
The SHTDN output asserts upon overcurrent detection
on any of the 4 channels. OC1 to OC4 are logically ORed
together; SHTDN latches the output after some delay.
SHTDN latch delay is determined by the following equation:
t
DLY
= C
CDLY
× (V
DD
÷ 10µA)
Example C
CDLY
and t
DLY
pairs are given in the Electrical
Characteristics table.
Figure 3. Bidirectional Application
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*Future product—contact factory for availability.
**EP = Exposed pad.
Package Information
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains
to the package regardless of RoHS status.
PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
24 TQFN-EP T2444+4
21-0139 90-0022
PART GAIN (V/V) TEMP RANGE PIN-PACKAGE
MAX34406TETG+* 25
-40NC to +85NC
24 TQFN-EP**
MAX34406TETG+T* 25
-40NC to +85NC
24 TQFN-EP**
MAX34406FETG+* 50
-40NC to +85NC
24 TQFN-EP**
MAX34406FETG+T* 50
-40NC to +85NC
24 TQFN-EP**
MAX34406HETG+ 100
-40NC to +85NC
24 TQFN-EP**
MAX34406HETG+T 100
-40NC to +85NC
24 TQFN-EP**
MAX34406WETG+* 200
-40NC to +85NC
24 TQFN-EP**
MAX34406WETG+T* 200
-40NC to +85NC
24 TQFN-EP**
IN2+
OUT1
IN2-
GND
IN1+ IN1-
R
SENSE
I
LOAD
OUT2
MAX34406
µC
ADC
INPUTS
V
DD
= 3.3V