MAX9634 Datasheet by Maxim Integrated

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General Description
The MAX9634 high-side current-sense amplifier offers
precision accuracy specifications of VOS less than 250μV
(max) and gain error less than 0.5% (max). Quiescent
supply current is an ultra-low 1μA. The MAX9634 fits
in a tiny, 1mm x 1mm UCSP™ package size or a 5-pin
SOT23 package, making the part ideal for applications in
notebook computers, cell phones, PDAs, and all battery-
operated portable devices where accuracy, low quiescent
current, and small size are critical.
The MAX9634 features an input common-mode voltage
range from 1.6V to 28V. These current-sense amplifiers
have a voltage output and are offered in four gain ver-
sions: 25V/V (MAX9634T), 50V/V (MAX9634F), 100V/V
(MAX9634H), and 200V/V (MAX9634W).
The four gain selections offer flexibility in the choice of
the external current-sense resistor. The very low 250μV
(max) input offset voltage allows small 25mV to 50mV
full-scale VSENSE voltage for very low voltage drop at
full-current measurement.
The MAX9634 is offered in tiny 4-bump UCSP (1mm
x 1mm x 0.6mm footprint) and 5-pin SOT23 packages
specified for operation over the -40°C to +85°C extended
temperature range.
Applications
Cell Phones
PDAs
Power-Management Systems
Portable/Battery-Powered Systems
Notebook Computers
Benefits and Features
Ultra-Low Supply Current of 1μA (max)
Low 250μV (max) Input Offset Voltage
Low < 0.5% (max) Gain Error
Input Common Mode: +1.6V to +28V
Voltage Output
Four Gain Versions Available
25V/V (MAX9634T)
50V/V (MAX9634F)
100V/V (MAX9634H)
200V/V (MAX9634W)
Tiny 1mm x 1mm x 0.6mm, 4-Bump UCSP or 5-Pin
SOT23 Packages
19-5021; Rev 3; 3/17
UCSP is a trademark of Maxim Integrated Products, Inc.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Note: All devices are specified over the -40°C to +85°C
extended temperature range.
PART PIN-
PACKAGE
GAIN
(V/V)
TOP
MARK
MAX9634TERS+ 4 UCSP 25 +ABX
MAX9634FERS+ 4 UCSP 50 +ABY
MAX9634HERS+ 4 UCSP 100 +ABZ
MAX9634WERS+ 4 UCSP 200 +ACA
MAX9634TEUK+ 5 SOT23 25 +AFHG
MAX9634FEUK+ 5 SOT23 50 +AFHH
MAX9634HEUK+ 5 SOT23 100 +AFHI
MAX9634WEUK+ 5 SOT23 200 +AFHJ
MAX9634T/F/H/W
MAX9634T/F/H/W
5 4
1 32
RS+ RS-
GND OUTGND
SOT23
UCSP
TOP VIEW
(BUMPS ON BOTTOM)
B1 B2
A1
GND
RS+
OUT
RS-A2
DRAWINGS NOT TO SCALE
MAX9634 nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
Pin Configurations
Ordering Information
EVALUATION KIT AVAILABLE
RS+, RS- to GND ..................................................-0.3V to +30V
OUT to GND ............................................................-0.3V to +6V
RS+ to RS- ..........................................................................±30V
Short-Circuit Duration: OUT to GND .........................Continuous
Continuous Input Current (any pin) .................................. ±20mA
Continuous Power Dissipation (TA = +70°C)
4-Bump UCSP (derate 3.0mW/°C above +70°C) ........238mW
5-Pin SOT23 (derate 3.9mW/°C above +70°C) ..........312mW
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
Soldering Temperature (reflow) ....................................... +260°C
(VRS+ = VRS- = 3.6V, VSENSE = (VRS+ - VRS-) = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
(Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Current (Note 2) ICC
VRS+ = 5V, TA = +25°C 0.5 0.85
µA
VRS+ = 5V, -40°C < TA < +85°C 1.1
VRS+ = 28V, TA = +25°C 1.1 1.8
VRS+ = 28V, -40°C < TA < +85°C 2.5
Common-Mode Input Range VCM Guaranteed by CMRR, -40°C < TA < +85°C 1.6 28 V
Common-Mode Rejection Ratio CMRR 1.6V < VRS+ < 28V, -40°C < TA < +85°C 94 130 dB
Input Offset Voltage (Note 3) VOS
MAX9634T/MAX9634F/
MAX9634H
TA = +25°C 100 250
µV
-40°C < TA < +85°C 300
MAX9634W TA = +25°C 100 250
-40°C < TA < +85°C 425
Gain G
MAX9634T 25
V/V
MAX9634F 50
MAX9634H 100
MAX9634W 200
Gain Error (Note 4) GE
MAX9634T/MAX9634F/
MAX9634H
TA = +25°C ±0.1 ±0.5
%
-40°C < TA < +85°C ±0.6
MAX9634W TA = +25°C ±0.1 ±0.7
-40°C < TA < +85°C ±0.8
Output Resistance (Note 5) ROUT
MAX9634T/MAX9634F/MAX9634H 7.0 10 13.2 kΩ
MAX9634W 14.0 20 26.4
OUT Low Voltage VOL
Gain = 25 1.5 7.5
mV
Gain = 50 3 15
Gain = 100 6 30
Gain = 200 12 85
MAX9634 nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
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Absolute Maximum Ratings
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.
Electrical Characteristics
(VRS+ = VRS- = 3.6V, VSENSE = (VRS+ - VRS-) = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
(Note 1)
Note 1: All devices are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design.
Note 2: VOUT = 0. ICC is the total current into RS+ plus RS- pins.
Note 3: VOS is extrapolated from measurements for the gain-error test.
Note 4: Gain error is calculated by applying two values of VSENSE and calculating the error of the slope vs. the ideal:
Gain = 25, VSENSE is 20mV and 120mV.
Gain = 50, VSENSE is 10mV and 60mV.
Gain = 100, VSENSE is 5mV and 30mV.
Gain = 200, VSENSE is 2.5mV and 15mV.
Note 5: The device is stable for any external capacitance value.
Note 6: VOH is the voltage from VRS- to VOUT with VSENSE = 3.6V/gain.
(VRS+ = VRS- = 3.6V, TA = +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUT High Voltage VOH VOH = VRS- - VOUT (Note 6) 0.1 0.2 V
Small-Signal Bandwidth
(Note 5) BW
VSENSE = 50mV, gain = 25 125
kHz
VSENSE = 50mV, gain = 50 60
VSENSE = 50mV, gain = 100 30
VSENSE = 50mV, gain = 200 15
Output Settling Time tS1% final value, VSENSE = 50mV 100 µs
0
10
5
20
15
25
30
-0.4 -0.3 -0.2 -0.1 0 0.2 0.30.1 0.4
GAIN ERROR HISTOGRAM
MAX9634 toc02
GAIN ERROR (%)
N (%)
SUPPLY CURRENT
vs. TEMPERATURE
MAX9634 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
10-15 35 60
0.4
0.2
0.6
0.8
1.0
1.2
1.4
28V
3.6V
1.8V
0
-40 85
0
10
5
20
15
25
30
-0.4 -0.3 -0.2 -0.1 0 0.2 0.30.1 0.4
INPUT OFFSET VOLTAGE HISTOGRAM
MAX9634 toc01
INPUT OFFSET VOLTAGE (mV)
N (%)
MAX9634 nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
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Electrical Characteristics (continued)
Typical Operating Characteristics
VsENs gr 5qu V HHH VsENsE
(VRS+ = VRS- = 3.6V, TA = +25°C, unless otherwise noted.)
INPUT OFFSET
vs. COMMON-MODE VOLTAGE
MAX9634 toc04
COMMON-MODE VOLTAGE (V)
INPUT OFFSET (V)
2520105 15
-50
-45
-40
-35
-30
-55
0 30
INPUT OFFSET
vs. TEMPERATURE
MAX9634 toc05
INPUT OFFSET (V)
20
10
30
40
50
60
0
TEMPERATURE (°C)
10-15 35 60-40 85
SUPPLY CURRENT
vs. COMMON-MODE VOLTAGE
MAX9634 toc06
COMMON-MODE VOLTAGE (V)
SUPPLY CURRENT (µA)
15 2010 305 25
1.0
0.8
0.6
0.4
0.2
1.2
1.4
0
0
-0.5
-0.3
-0.4
-0.1
-0.2
0
0.1
0 10 155 20 25 30
GAIN ERROR
vs. COMMON-MODE VOLTAGE
MAX9634 toc07
VOLTAGE (V)
GAIN ERROR (%)
GAIN ERROR
vs. TEMPERATURE
MAX9634 toc08
TEMPERATURE (°C)
GAIN ERROR (%)
10 60 8535-15
0.06
0.05
0.04
0.03
0.02
0.01
0.07
0.08
0
-40
VOUT vs. VSENSE
(SUPPLY = 3.6V)
MAX9634 toc09
V
SENSE
(mV)
VOUT (V)
10050
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
0 150
G = 100
G = 25
G = 50
VOUT vs. VSENSE
(SUPPLY = 1.6V)
MAX9634 toc10
V
SENSE
(mV)
V
OUT
(V)
80604020
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0
0 100
G = 100
G = 50
G = 25
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX9634 toc11
FREQUENCY (Hz)
GAIN (dB)
100k10 1M100 10k1k
-5
-10
-15
-20
-25
0
5
-30
1
AV = 25V/V
AV = 100V/V
AV = 50V/V
CMRR
vs. FREQUENCY
MAX9634 toc12
FREQUENCY (Hz)
CMRR (dB)
100k10 1M100 10k1k
-40
-60
-80
-100
-120
-140
-20
0
-160
1
G = 25
G = 50
G = 100
MAX9634 nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
Maxim Integrated
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Typical Operating Characteristics (continued)
(VRS+ = VRS- = 3.6V, TA = +25°C, unless otherwise noted.)
PIN NAME FUNCTION
UCSP SOT23
A1 5 RS+ External Sense Resistor Power-Side Connection
A2 4 RS- External Sense Resistor Load-Side Connection
B1 1, 2 GND Ground
B2 3 OUT Output Voltage. VOUT is proportional to VSENSE = VRS+ - VRS-.
SMALL-SIGNAL PULSE RESPONSE
(GAIN = 100)
MAX9634 toc13a
20µs/div
VOUT
VSENSE
1V
1.5V
10mV
15mV
SMALL-SIGNAL PULSE RESPONSE
(GAIN = 50)
MAX9634 toc13b
25µs/div
VOUT
VSENSE
1V
1.5V
20mV
30mV
SMALL-SIGNAL PULSE RESPONSE
(GAIN = 25)
MAX9634 toc13c
25µs/div
VOUT
VSENSE
1V
1.5V
40mV
60mV
LARGE-SIGNAL PULSE RESPONSE
(GAIN = 100)
MAX9634 toc14a
20µs/div
VOUT
VSENSE
1V
3V
10mV
30mV
LARGE-SIGNAL PULSE RESPONSE
(GAIN = 50)
MAX9634 toc14b
25µs/div
VOUT
VSENSE
0.5V
3V
10mV
60mV
LARGE-SIGNAL PULSE RESPONSE
(GAIN = 25)
MAX9634 toc14c
25µs/div
VOUT
VSENSE
0.5V
3V
20mV
120mV
MAX9634 nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
Maxim Integrated
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Typical Operating Characteristics (continued)
Pin Description
4,, 4,, L;
Detailed Description
The MAX9634 unidirectional high-side, current-sense
amplifier features a 1.6V to 28V input common-mode
range. This feature allows the monitoring of current out
of a battery with a voltage as low as 1.6V. The MAX9634
monitors current through a current-sense resistor and
amplifies the voltage across that resistor.
The MAX9634 is a unidirectional current-sense amplifier
that has a well-established history. An op amp is used
to force the current through an internal gain resistor at
RS+, which has a value of R1, such that its voltage drop
equals the voltage drop across an external sense resis-
tor, RSENSE. There is an internal resistor at RS- with the
same value as R1 to minimize offset voltage. The current
through R1 is sourced by a high-voltage p-channel FET.
Its source current is the same as its drain current, which
flows through a second gain resistor, ROUT. This produc-
es an output voltage, VOUT, whose magnitude is ILOAD
x RSENSE x ROUT/R1. The gain accuracy is based on
the matching of the two gain resistors R1 and ROUT (see
Table 1). Total gain = 25V/V for the MAX9634T, 50V/V for
the MAX9634F, 100V/V for the MAX9634H, and 200V/V
for the MAX9634W. The output is protected from input
overdrive by use of an output current-limiting circuit of
7mA (typical) and a 6V clamp protection circuit.
Applications Information
Choosing the Sense Resistor
Choose RSENSE based on the following criteria:
Voltage Loss
A high RSENSE value causes the power-source voltage
to drop due to IR loss. For minimal voltage loss, use the
lowest RSENSE value.
Table 1. Internal Gain-Setting Resistors
(Typical Values)
GAIN
(V/V)
R1
(Ω)
ROUT
(kΩ)
200 100 20
100 100 10
50 200 10
25 400 10
VBATT = 1.6V TO 28V
RSENSE
R1
ILOAD
ROUT
R1
GND
OUT
P
MAX9634
RS+ RS-
ADC
LOAD
µC
VDD = 3.3V
10k
MAX9634 nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
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Typical Operating Circuit
OUT Swing vs. VRS+ and VSENSE
The MAX9634 is unique because the supply voltage is
the input common-mode voltage (the average voltage at
RS+ and RS-). There is no separate VCC supply voltage
pin. Therefore, the OUT voltage swing is limited by the
minimum voltage at RS+.
VOUT (max) = VRS+ (min) - VSENSE (max) - VOH
and:
ü
SENSE
LOAD
V (max)
RG I (max)
=
×
VSENSE full scale should be less than VOUT/GAIN at the
minimum RS+ voltage. For best performance with a 3.6V
supply voltage, select RSENSE to provide approximately
120mV (gain of 25V/V), 60mV (gain of 50V/V), 30mV (gain
of 100V/V), or 15mV (gain of 200V/V) of sense voltage for
the full-scale current in each application. These can be
increased by use of a higher minimum input voltage.
Accuracy
In the linear region (VOUT < VOUT (max)), there are two
components to accuracy: input offset voltage (VOS) and
gain error (GE). For the MAX9634, VOS = 250μV (max)
and gain error is 0.5% (max). Use the linear equation:
VOUT = (gain ± GE) x VSENSE ± (gain x VOS)
to calculate total error. A high RSENSE value allows lower
currents to be measured more accurately because offsets
are less significant when the sense voltage is larger.
Efficiency and Power Dissipation
At high current levels, the I2R losses in RSENSE can be
significant. 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. The precision VOS of the MAX9634
allows the use of small sense resistors to reduce power
dissipation and reduce hot spots.
Kelvin Connections
Because of the high currents that flow through RSENSE,
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) PCB layout techniques.
Optional Output Filter Capacitor
When designing a system that uses a sample-and-hold
stage in the ADC, the sampling capacitor momentarily
loads OUT and causes a drop in the output voltage. If
sampling time is very short (less than a microsecond),
consider using a ceramic capacitor across OUT and
GND to hold VOUT constant during sampling. This also
decreases the small-signal bandwidth of the current-
sense amplifier and reduces noise at OUT.
MAX9634 nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
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Bidirectional Application
Battery-powered systems may require a precise bidirec-
tional current-sense amplifier to accurately monitor the
battery’s charge and discharge currents. Measurements
of the two separate outputs with respect to GND yields an
accurate measure of the charge and discharge currents,
respectively (Figure 1).
UCSP Applications Information
For the latest application details on UCSP construction,
dimensions, tape carrier information, PCB techniques,
bump-pad layout, and recommended reflow temperature
profile, as well as the latest information on reliability test-
ing results, refer to Application Note 1891: Wafer-Level
Packaging (WLP) and Its Applications.
Figure 1. Bidirectional Application
VBATT = 1.6V TO 28V
RSENSE
R1
ILOAD
ROUT
R1
GND
P
MAX9634
R1
ROUT
R1
GND
P
OUT OUT
TO WALL-CUBE/
CHARGER
MAX9634
RS+ RS-RS- RS+
ADC
ADC
LOAD
µC
VDD = 3.3V
10k10k
MAX9634 nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
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Chip Information
PROCESS: BiCMOS
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PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND
PATTERN NO.
2 x 2 UCSP R41A1+1 21-0242 —
5 SOT23 U5-2 21-0057 90-0174
MAX9634 nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
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9
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.
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MAX9634 nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
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Package Information (continued)
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.
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 10/09 Initial release
1 2/10 Corrected gain error limits in Electrical Characteristics table 2
2 8/10 Removed Power-Up Time parameter 3
3 3/17 Updated title to include “nanoPower” and updated package outline drawing 1–11
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
MAX9634 nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
© 2017 Maxim Integrated Products, Inc.
11
Revision History
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

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