MAX4006EUT+T Maxim Integrated Products, MAX4006EUT+T Datasheet - Page 7

• Manufacturer Part Number: MAX4006EUT+T
• Description: IC CURRENT MONITOR 1% SOT23-6
• Manufacturer: Maxim Integrated Products

Specifications of MAX4006EUT+T

• Function: Current Monitor
• Sensing Method: High-Side
• Accuracy: ±1%
• Voltage - Input: 2.7 ~ 22 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: MAX4006EUT+T; MAX4006EUT+TTR

The MAX4004/MAX4006 are versatile current monitors
intended for monitoring DC photodiode current in fiber
applications (see the Functional Diagram). The
MAX4004 output is a current that is exactly one-tenth of
the reference current. The MAX4006 outputs a voltage
that is proportional to the reference current with a tran-
simpedance gain of 1V/mA achieved by a factory-
trimmed, internal 10kΩ resistor.
Both current devices have six decades of dynamic
range and monitor reference current ranging from 250nA
to 2.5mA, the nominal operating range, with better than
5% accuracy across the entire reference current, bias
voltage, and temperature ranges. The corresponding
monitor outputs produce 25nA to 0.25mA (MAX4004)
and 0.25mV to 2.5V (MAX4006). When the reference
currents are extended to the broader range of 10nA to
10mA, an accuracy of less than 10% is maintained.
Internal current limiting (20mA, typ) protects the device
against short-circuit-to-ground conditions, and a thermal
shutdown feature reduces both the reference current
and the monitor current to zero if the die temperature
reaches +150°C.
The MAX4004/MAX4006 accept a +2.7V to +22V
supply voltage, suitable for PIN photodiode applica-
tions. A clamping diode, shown in the Functional
Diagram, is provided to protect subsequent output cir-
cuitry from an overvoltage condition.
High-Accuracy, High-Side Current Monitors
REF
_______________________________________________________________________________________
CURRENT
CLAMP
Detailed Description
10x
BIAS
CURRENT
MONITOR
GND
1x
MAX4004
CLAMP
OUT
CLAMP provides a means for diode clamping the volt-
age at OUT, thus V
CLAMP can be connected to either an external supply,
to BIAS, or can be left floating if voltage clamping is not
required.
When using the MAX4004/MAX4006 to monitor PIN
photodiode currents in fiber applications, several
issues must be addressed. In applications where the
photodiode must be fully depleted, keep track of volt-
ages budgeted for each component with respect to the
available supply voltage(s). The current monitor
requires as much as 1.2V between BIAS and REF,
which must be considered as part of the overall voltage
budget.
Additional voltage margin can be created if a negative
supply is used in place of a ground connection, as long
as the overall voltage drop experienced by the
MAX4004/MAX4006 is less than or equal to 22V. For
this type of application, the MAX4004 is suggested so
the output can be referenced to “true” ground and not
the negative supply. The MAX4004’s output current can
be referenced as desired with either a resistor to
ground or a transimpedance amplifier. Take care to
ensure that output voltage excursions do not interfere
with the required margin between BIAS and OUT.
Clamping the Monitor Output Voltage
REF
CURRENT
CLAMP
Using PIN Photodiodes in Fiber
Applications Information
10x
BIAS
CURRENT
MONITOR
OUT
Functional Diagrams
1x
is limited to V
MAX4006
GND
10kΩ
in SOT23
CLAMP
OUT
Applications
CLAMP
+ 0.6V.
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