MAX9634_V01 [MAXIM]
nanoPower, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier;
| 型号： | MAX9634_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | nanoPower, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier |
| 文件： | 总9页 (文件大小：1107K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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MAX9634
nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
General Description
The MAX9634 high-side current-sense amplifier offers
precision accuracy specifications of V
(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.
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
less than 250μV
OS
● Four Gain Versions Available
• 25V/V (MAX9634T)
• 50V/V (MAX9634F)
• 100V/V (MAX9634H)
• 200V/V (MAX9634W)
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).
● Tiny 1mm x 1mm x 0.6mm, 4-Bump UCSP or 5-Pin
SOT23 Packages
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
Ordering Information
PIN-
GAIN
(V/V)
TOP
MARK
PART
PACKAGE
full-scale V
voltage for very low voltage drop at
SENSE
full-current measurement.
MAX9634TERS+
MAX9634FERS+
MAX9634HERS+
MAX9634WERS+
MAX9634TEUK+
MAX9634FEUK+
MAX9634HEUK+
MAX9634WEUK+
4 UCSP
4 UCSP
4 UCSP
4 UCSP
5 SOT23
5 SOT23
5 SOT23
5 SOT23
25
50
+ABX
+ABY
The MAX9634 is offered in tiny 4-bump UCSP (1mm x
1mm x 0.6mm footprint) and 5-pin SOT23 packages.
100
200
25
+ABZ
+ACA
Applications
● Cell Phones
● PDAs
● Power-Management Systems
● Portable/Battery-Powered Systems
● Notebook Computers
+AFHG
+AFHH
+AFHI
+AFHJ
50
100
200
+Denotes a lead(Pb)-free/RoHS-compliant package.
Note: All devices except for the MAX9634FEUK+ are specified
over the -40°C to +85°C extended temperature range. The
MAX9634FEUK+ is specified over the -40°C to +125°C auto-
motive temperature range.
UCSP is a trademark of Maxim Integrated Products, Inc.
Pin Configurations
TOP VIEW
(BUMPS ON BOTTOM)
RS+
5
RS-
4
RS+
A1
A2
RS-
MAX9634T/F/H/W
MAX9634T/F/H/W
GND
B1
B2
OUT
1
2
3
UCSP
DRAWINGS NOT TO SCALE
GND
GND
OUT
SOT23
19-5021; Rev 6; 7/21
MAX9634
nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
Absolute Maximum Ratings
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
Operating Temperature Range........................... -40°C to +85°C
Operating Temperature Range (MAX9634FEUK+)
...................................................................... -40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow).......................................+260°C
Continuous Power Dissipation (T = +70°C)
A
4-Bump UCSP (derate 11.40mW/°C above +70°C) ... 915.23mW
5-Pin SOT23 (derate 3.9mW/°C above +70°C) ..........312mW
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
(V
= V
= 3.6V, V
= (V
- V
) = 0V, T = -40°C to +85°C, T (MAX9634FEUK+) = -40°C to +125°C, unless otherwise
RS+
RS-
SENSE
RS+
RS-
A
A
noted. Typical values are at T = +25°C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
= 5V, T =
A
RS+
0.5
0.85
+25°C
V
= 5V, -40°C <
< +85°C
RS+
1.1
1.8
T
A
MAX9634T/MAX9634H/
MAX9634W
µA
V
= 28V, T =
A
RS+
1.1
0.5
+25°C
V
= 28V, -40°C <
< +85°C
RS+
2.5
T
A
Supply Current (Note 2)
I
CC
V
= 5V, T =
A
RS+
0.85
+25°C
V
= 5V, -40°C <
< +125°C
RS+
1.1
1.8
2.5
T
A
MAX9634F
V
= 28V, T =
A
RS+
1.1
+25°C
V
= 28V, -40°C <
< +125°C
RS+
T
A
MAX9634T/MAX9634H/ Guaranteed by CMRR,
MAX9634W
-40°C < T < +85°C
A
Common-Mode Input Range
V
1.6
94
28
V
CM
Guaranteed by CMRR,
MAX9634F
-40°C < T < +125°C
A
MAX9634T/MAX9634H/ 1.6V < V
MAX9634W
< 28V,
RS+
-40°C < T < +85°C
A
Common-Mode Rejection Ratio
CMRR
130
dB
1.6V < V
< 28V,
RS+
MAX9634F
-40°C < T < +125°C
A
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MAX9634
nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
Electrical Characteristics (continued)
(V
= V
= 3.6V, V
= (V
- V
) = 0V, T = -40°C to +85°C, T (MAX9634FEUK+) = -40°C to +125°C, unless otherwise
RS+
RS-
SENSE
RS+
RS-
A
A
noted. Typical values are at T = +25°C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
250
300
250
425
UNITS
T
= +25°C
100
MAX9634T/MAX9634F/
MAX9634H
A
-40°C < T < +85°C
A
Input Offset Voltage (Note 3)
V
µV
OS
T
= +25°C
100
A
MAX9634W
-40°C < T < +85°C
A
MAX9634T
MAX9634F
MAX9634H
MAX9634W
25
50
Gain
G
V/V
100
200
±0.1
T
= +25°C
±0.5
±0.6
±0.7
±0.8
13.2
26.4
7.5
MAX9634T/MAX9634F/
MAX9634H
A
-40°C < T < +85°C
A
Gain Error (Note 4)
GE
%
T
= +25°C
±0.1
A
MAX9634W
-40°C < T < +85°C
A
MAX9634T/MAX9634F/MAX9634H
MAX9634W
7.0
10
20
1.5
3
Output Resistance (Note 5)
OUT Low Voltage
R
kΩ
mV
OUT
14.0
Gain = 25
Gain = 50
15
V
OL
Gain = 100
6
30
Gain = 200
12
85
MAX9634T/MAX9634H/ V
= V
- V
,
OH
RS-
OUT
0.1
0.1
0.2
MAX9634W
-40°C < T < +85°C
A
OUT High Voltage (Note 6)
V
V
OH
V
= V
- V
,
OH
RS-
OUT
0.36
MAX9634F
-40°C < T < +125°C
A
V
V
V
V
= 50mV, gain = 25
125
60
SENSE
SENSE
SENSE
SENSE
= 50mV, gain = 50
= 50mV, gain = 100
= 50mV, gain = 200
Small-Signal Bandwidth
(Note 5)
BW
kHz
µs
30
15
Output Settling Time
t
1% final value, V
= 50mV
SENSE
100
S
Note 1: All devices are 100% production tested at T = +25°C. All temperature limits are guaranteed by design.
A
Note 2: V
Note 3: V
= 0. I
is the total current into RS+ plus RS- pins.
is extrapolated from measurements for the gain-error test.
OUT
OS
CC
Note 4: Gain error is calculated by applying two values of V
and calculating the error of the slope vs. the ideal:
SENSE
Gain = 25, V
Gain = 50, V
is 20mV and 120mV.
is 10mV and 60mV.
SENSE
SENSE
Gain = 100, V
Gain = 200, V
is 5mV and 30mV.
is 2.5mV and 15mV.
SENSE
SENSE
Note 5: The device is stable for any external capacitance value.
Note 6: V is the voltage from V to V with V = 3.6V/gain.
OH
RS-
OUT
SENSE
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MAX9634
nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
Typical Operating Characteristics
(V
= V
= 3.6V, T = +25°C, unless otherwise noted.)
RS+
RS- A
SUPPLY CURRENT
GAIN ERROR HISTOGRAM
vs. TEMPERATURE
INPUT OFFSET VOLTAGE HISTOGRAM
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
30
25
20
15
10
5
30
25
20
15
10
5
28V
3.6V
1.8V
0
0
-0.4 -0.3 -0.2 -0.1
0
0.1 0.2 0.3 0.4
-0.4 -0.3 -0.2 -0.1
0
0.1 0.2 0.3 0.4
-40
-15
10
35
60
85
INPUT OFFSET VOLTAGE (mV)
GAIN ERROR (%)
TEMPERATURE (°C)
INPUT OFFSET
INPUT OFFSET
SUPPLY CURRENT
vs. COMMON-MODE VOLTAGE
vs. TEMPERATURE
vs. COMMON-MODE VOLTAGE
-30
-35
-40
-45
-50
-55
60
50
40
30
20
10
0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
5
10
15
20
25
30
-40
-15
10
35
60
85
0
5
10
15
20
25
30
COMMON-MODE VOLTAGE (V)
TEMPERATURE (°C)
COMMON-MODE VOLTAGE (V)
GAIN ERROR
GAIN ERROR
V
OUT
vs. V
SENSE
vs. COMMON-MODE VOLTAGE
vs. TEMPERATURE
(SUPPLY = 3.6V)
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0.1
0
G = 100
G = 50
-0.1
-0.2
-0.3
-0.4
-0.5
G = 25
0
5
10
15
20
25
30
-40
-15
10
35
60
85
0
50
100
(mV)
150
VOLTAGE (V)
TEMPERATURE (°C)
V
SENSE
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MAX9634
nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
Typical Operating Characteristics (continued)
(V
= V
= 3.6V, T = +25°C, unless otherwise noted.)
RS+
RS- A
SMALL-SIGNAL GAIN
vs. FREQUENCY
CMRR
vs. FREQUENCY
V
vs. V
SENSE
OUT
(SUPPLY = 1.6V)
5
0
0
-20
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
A
= 25V/V
V
G = 25
G = 50
-40
A
V
= 100V/V
-5
-60
G = 100
G = 50
A = 50V/V
V
-10
-15
-20
-25
-30
-80
G = 100
-100
-120
-140
-160
G = 25
1
10
100
1k
10k 100k
1M
1
10
100
1k
10k 100k
1M
0
20
40
60
80
100
FREQUENCY (Hz)
FREQUENCY (Hz)
V
(mV)
SENSE
SMALL-SIGNAL PULSE RESPONSE
SMALL-SIGNAL PULSE RESPONSE
SMALL-SIGNAL PULSE RESPONSE
(GAIN = 25)
MAX9634 toc13c
(GAIN = 100)
(GAIN = 50)
MAX9634 toc13a
MAX9634 toc13b
15mV
10mV
30mV
60mV
V
SENSE
V
SENSE
V
SENSE
20mV
1.5V
40mV
1.5V
1.5V
1V
V
OUT
V
OUT
V
1V
1V
OUT
20µs/div
25µs/div
25µs/div
LARGE-SIGNAL PULSE RESPONSE
LARGE-SIGNAL PULSE RESPONSE
LARGE-SIGNAL PULSE RESPONSE
(GAIN = 100)
(GAIN = 50)
(GAIN = 25)
MAX9634 toc14a
MAX9634 toc14b
MAX9634 toc14c
30mV
10mV
120mV
60mV
V
V
SENSE
SENSE
V
SENSE
10mV
3V
20mV
3V
3V
1V
V
V
V
OUT
OUT
OUT
0.5V
0.5V
20µs/div
25µs/div
25µs/div
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MAX9634
nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
Pin Description
PIN
NAME
FUNCTION
UCSP
A1
SOT23
5
4
RS+
RS-
External Sense Resistor Power-Side Connection
External Sense Resistor Load-Side Connection
Ground
A2
B1
1, 2
GND
B2
3
OUT
Output Voltage. V
is proportional to V
= V
- V
.
OUT
SENSE
RS+
RS-
Typical Operating Circuit
I
LOAD
R
SENSE
V
BATT
= 1.6V TO 28V
RS+
RS-
R
1
R
1
V
DD
= 3.3V
LOAD
µC
P
MAX9634
OUT
ADC
R
OUT
10kΩ
GND
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MAX9634
nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
pin. Therefore, the OUT voltage swing is limited by the
minimum voltage at RS+.
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.
V
OUT
(max) = V
(min) - V
(max) - V
OH
RS+
SENSE
and:
V
(max)
OUT
R
=
SENSE
G×I
(max)
LOAD
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
V
full scale should be less than V
/GAIN at the
SENSE
OUT
minimum RS+ voltage. For best performance with a 3.6V
supply voltage, select R 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.
SENSE
RS+, which has a value of R , such that its voltage drop
1
equals the voltage drop across an external sense resis-
tor, R
. There is an internal resistor at RS- with the
SENSE
same value as R to minimize offset voltage. The current
1
through R is sourced by a high-voltage p-channel FET.
1
Its source current is the same as its drain current, which
Accuracy
flows through a second gain resistor, R
. This produc-
OUT
In the linear region (V
components to accuracy: input offset voltage (V ) and
gain error (GE). For the MAX9634, V
and gain error is 0.5% (max). Use the linear equation:
< V
(max)), there are two
OUT
OUT
es an output voltage, V , whose magnitude is I
OUT
LOAD
OS
x R
x R /R . The gain accuracy is based on
OUT 1
SENSE
= 250μV (max)
OS
the matching of the two gain resistors R and R
(see
OUT
1
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.
V
= (gain ± GE) x V ± (gain x V
)
OS
OUT
SENSE
to calculate total error. A high R
currents to be measured more accurately because offsets
are less significant when the sense voltage is larger.
value allows lower
SENSE
Efficiency and Power Dissipation
Applications Information
2
At high current levels, the I R losses in R
can be
SENSE
Choosing the Sense Resistor
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
Choose R
based on the following criteria:
SENSE
Voltage Loss
A high R
heat up excessively. The precision V
of the MAX9634
OS
value causes the power-source voltage
SENSE
allows the use of small sense resistors to reduce power
dissipation and reduce hot spots.
to drop due to IR loss. For minimal voltage loss, use the
lowest R value.
SENSE
Kelvin Connections
OUT Swing vs. V
and V
SENSE
RS+
Because of the high currents that flow through R
,
SENSE
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 V
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.
supply voltage
CC
Table 1. Internal Gain-Setting Resistors
(Typical Values)
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
GAIN
(V/V)
R
R
OUT
(kΩ)
1
(Ω)
100
100
200
400
200
100
50
20
10
GND to hold V
constant during sampling. This also
OUT
decreases the small-signal bandwidth of the current-
sense amplifier and reduces noise at OUT.
10
25
10
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MAX9634
nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
I
LOAD
R
SENSE
TO WALL-CUBE/
CHARGER
V
BATT
= 1.6V TO 28V
RS+
RS-
RS+
RS-
LOAD
R
1
R
1
R
1
R
1
P
P
MAX9634
MAX9634
V
DD
= 3.3V
OUT
OUT
R
OUT
R
OUT
10kΩ
10kΩ
µC
GND
GND
ADC
ADC
Figure 1. Bidirectional Application
Bidirectional Application
UCSP Applications Information
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).
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.
Chip Information
PROCESS: BiCMOS
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.
PACKAGE PACKAGE
TYPE CODE
2 x 2 UCSP R41A1+1
5 SOT23 U5-2
OUTLINE
LAND
PATTERN NO.
NO.
21-0242
21-0057
—
90-0174
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MAX9634
nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
1
2
3
4
10/09
2/10
8/10
3/17
7/19
Initial release
—
2
Corrected gain error limits in Electrical Characteristics table
Removed Power-Up Time parameter
3
Updated title to include “nanoPower” and updated package outline drawing
Updated TOC04 and TOC05
1–11
4
Updated General Description, Ordering Information note, Absolute Maximum Ratings,
and Electrical Characteristics table; fixed links
5
6
5/20
1, 2, 3
2
7/21
Updated Absolute Maximum Ratings
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
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.
2021 Maxim Integrated Products, Inc.
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