MAX4080TAUA+ Maxim Integrated Products, MAX4080TAUA+ Datasheet - Page 12

• Manufacturer Part Number: MAX4080TAUA+
• Description: IC AMP CURRENT SENSE 8-UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX4080TAUA+

• Amplifier Type: Current Sense
• Number Of Circuits: 1
• Gain Bandwidth Product: 250kHz
• Current - Input Bias: 5µA
• Voltage - Input Offset: 100µV
• Current - Supply: 75µA
• Voltage - Supply, Single/dual (±): 4.5 V ~ 76 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Product: Current Monitors
• Operating Temperature Range: + 125 C
• Mounting Style: SMD/SMT
• Accuracy: 0.6 %
• Bandwidth: 250 KHz
• Sense Voltage (max): 250 mV
• Supply Current (max): 0.075 mA (Typ) @ 76 V
• Supply Voltage (max): 76 V
• Supply Voltage (min): 4.5 V
• No. Of Amplifiers: 1
• Input Bias Current: 12µA
• Input Offset Voltage: 600µV
• Cmrr: 124dB
• Supply Voltage Range: 4.5V To 76V
• Supply Current: 75µA
• Amplifier Case Style: µMAX
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Current - Output / Channel: -
• -3db Bandwidth: -
• Slew Rate: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

76V, High-Side, Current-Sense Amplifiers with
Voltage Output
The full-scale output voltage is V
(MAX)
R
V
250mV for the 20V/V gain version, and 100mV for the
60V/V gain version.
Choose R
• Voltage Loss: A high R
• Accuracy: A high R
• Efficiency and Power Dissipation: At high current
• Inductance: Keep inductance low if I
Figure 4. MAX4081 Reference Inputs
12
SENSE(MAX)
SENSE
power-source voltage to degrade through IR loss. For
minimal voltage loss, use the lowest R
rents to be measured more accurately. This is due to
offsets becoming less significant when the sense
voltage is larger. For best performance, select
R
5V/V), 250mV (gain of 20V/V), or 100mV (gain of
60V/V) of sense voltage for the full-scale current in
each application.
levels, the I
Take this into consideration when choosing the
resistor value and its power dissipation (wattage)
rating. Also, the sense resistor’s value might drift if it
is allowed to heat up excessively.
large high-frequency component. Wire-wound resis-
tors have the highest inductance, while metal film is
somewhat better. Low-inductance, metal-film resis-
tors are also available. Instead of being spiral-
wrapped around a core, as in metal-film or wire-
wound resistors, they are a straight band of metal
and are available in values under 1Ω.
SENSE
______________________________________________________________________________________

A
SENSE

V
to provide approximately 1000mV (gain of
, for the MAX4080 and V
I
LOAD(MAX)
is 1000mV for the 5V/V gain version,
2
R losses in R
based on the following criteria:
Choosing the Sense Resistor
V
GND
CC
SENSE
RS+
MAX4081

I
LOAD
R
SENSE
SENSE
SENSE
A
= 0
V
value allows lower cur-
OUT
RS-
for the MAX4081.
REF1A
REF1B
OUT
can be significant.
value causes the
= R
SENSE
OUT
SENSE
LOAD
SENSE
5V
= V
5V
value.

REF
I
has a
LOAD
±
Because of the high currents that flow through R
take care to eliminate parasitic trace resistance from
causing errors in the sense voltage. Either use a four-
terminal current-sense resistor or use Kelvin (force and
sense) PC board layout techniques.
Although the MAX4081 have fully symmetrical bidirec-
tional V
is usually higher from REF to V
to GND (unless the supply voltage is at the lowest end
of the operating range). Therefore, the user must con-
sider the dynamic range of current monitored in both
directions and choose the supply voltage and the refer-
ence voltage (REF) to make sure the output swing
above and below REF is adequate to handle the swings
without clipping or running out of headroom.
For most applications, bypass V
ceramic capacitor. In many applications, V
connected to one of the current monitor terminals (RS+
or RS-). Because V
voltage, V
supply.
If V
resistor can be added to the power-supply line of the
MAX4080/MAX4081 to minimize output disturbance.
This resistance and the decoupling capacitor reduce
the rise time of the transient. For most applications, 1kΩ
in conjunction with a 0.1µF bypass capacitor work well.
The MAX4080/MAX4081 require no special considera-
tions with respect to layout or grounding. Consideration
should be given to minimizing errors due to the large
charge and discharge currents in the system.
CC
Power-Supply Bypassing and Grounding
SENSE
will be subject to fast-line transients, a series
CC
V
GND
CC
can be connected to a separate regulated
RS+
input capability, the output voltage range
MAX4081
Dynamic Range Consideration
I
LOAD
R
SENSE
CC
= 0
is independent of the monitored
RS-
REF1A
REF1B
OUT
LOAD
CC
CC
5V
10V
and lower from REF
to GND with a 0.1µF
CC
can be
SENSE
,