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MAX40010TAUT+T

P1-P3P4-P6P7-P9P10-P12P13-P13
• Efficiency and Power Dissipation: At high current levels,
the I
2
R losses in R
SENSE
can be significant. Consider
this when choosing the resistor value and its power
dissipation (wattage) rating. In addition, the sense resistor’s
value might drift if it heats up excessively.
• Inductance: Keep inductance low if I
SENSE
has a large
high-frequency component. Wire-wound resistors have
the highest inductance, while metal film is somewhat
better. Low-inductance, metal-film resistors 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.
Take care to eliminate parasitic trace resistance from
causing errors in the sense voltage because of the high
currents that flow through R
SENSE
. Either use a four
terminal current-sense resistor or use Kelvin (force and
sense) PC board layout techniques.
EMIRR Input Filter
These devices have input EMI filters to prevent effects of
radio frequency interference on the output. The EMI filters
comprise passive devices that present significant higher
impedance to RF signals. See the EMIRR vs. Frequency
plot in the Typical Operating Characteristics section for
details.
Typical Application Circuit
An example of typical application (Figure 2) of this high-
voltage, high-precision current-sense amplifier is in base
station systems where there is a need to monitor the
current flowing in the power amplifier. Such amplifier,
depending on the technology, can be biased up to 50V
or 60V thus requiring a current-sense amplifier like the
MAX40010 with high voltage common mode. The very
low input offset voltage of the MAX40010 minimizes the
value of the external sense resistor, resulting in system
power saving.
Figure 2: MAX40010 Used in Base Station Application
RFIN
V
DD
= 3.3V
RFOUT
V
DRAIN
= 36V – 76V
RS+
RS-
250? 20?
220nF20nF
MAX11125
OUTPUT
VIN
REF-REF+
OUTF OUTS
V
DD
= 3.3V
MAX40010
MAX6126
μC
MAX40010 76V Precision, High-Voltage,
Current-Sense Amplier
www.maximintegrated.com
Maxim Integrated
│
10
Turn On/O Response
The internal POR (Power on Reset) structure creates the
inadvertent glitch, as shown in TOC18 and TOC19: typical
turn on and turn off response of MAX40010. The internal
POR event takes place below minimum V
CC
supply voltage
(2.7V) around 1.7V. During this event the bias generators
are defined, the internal blocks are set to known state
and as a result, an output (V
OUT
) glitch is observed. The
device may take tens of μs to settle to final value during
power on and less than 10ms to settle during turn off.
Output Filtering
To avoid output noise and transient overshoot, an RC
filter with R = 500Ω and C
L
= 14.7nF at the output is
recommended (Figure 3). This also benefits when the
current sense amplifier is connected to a sample and hold
ADC’s, where the C
L
will act as a charge reservoir during
sample phase. when choosing different values of R and
C
L
, refer to TOC20 (Stability vs. Isolation Resistance and
Capacitive Load) for more information.
Figure 3. Optional Output Filtering
R = 50 0Ω
C
L
= 14.7nF
R = 10kΩ
(OPTIONAL)
RS+
RS-
MAX40010
MAX40010 76V Precision, High-Voltage,
Current-Sense Amplier
www.maximintegrated.com
Maxim Integrated
│
11
*Future Product—Contact factory for availability.
+Denotes a lead(Pb)-free/RoHS-compliant package.
PART GAIN(V/V) TEMP RANGE PIN-PACKAGE TOP-MARK
MAX40010LAUT+ 12.5 -40°C to +125°C 6 SOT23 +ACUR
MAX40010LAWT+* 12.5 -40°C to +125°C 6 WLP +DX
MAX40010TAUT+ 20 -40°C to +125°C 6 SOT23 +ACUS
MAX40010TAWT+* 20 -40°C to +125°C 6 WLP +DY
MAX40010FAUT+ 50 -40°C to +125°C 6 SOT23 +ACUT
MAX40010FAWT+* 50 -40°C to +125°C 6 WLP +DV
MAX40010HAUT+ 100 -40°C to +125°C 6 SOT23 +ACUU
MAX40010HAWT+* 100 -40°C to +125°C 6 WLP +DW
PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
6 WLP W61K1+1 21-100121 Refer to Application Note 1891
6 SOT23 U6SN+1 21-0058 91-0175
MAX40010 76V Precision, High-Voltage,
Current-Sense Amplier
www.maximintegrated.com
Maxim Integrated
│
12
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.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.
Ordering Information
P1-P3P4-P6P7-P9P10-P12P13-P13

MAX40010TAUT+T

Mfr. #:
Buy MAX40010TAUT+T
Manufacturer:
Maxim Integrated
Description:
Current Sense Amplifiers 76V precisionCurrent Sense Amplifier
Lifecycle:
New from this manufacturer.
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