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19-5021; Rev 1; 2/10
KIT ATION EVALU BLE AVAILA
1A, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier
General Description Features
o Ultra-Low Supply Current of 1A (max) o Low 250V (max) Input Offset Voltage o Low < 0.5% (max) Gain Error o Input Common Mode: +1.6V to +28V o Voltage Output o Four Gain Versions Available 25V/V (MAX9634T) 50V/V (MAX9634F) 100V/V (MAX9634H) 200V/V (MAX9634W) o Tiny 1mm x 1mm x 0.6mm, 4-Bump UCSP or 5-Pin SOT23 Packages
MAX9634
The MAX9634 high-side current-sense amplifier offers precision accuracy specifications of V OS less than 250V (max) and gain error less than 0.5% (max). Quiescent supply current is an ultra-low 1A. The MAX9634 fits in a tiny, 1mm x 1mm UCSPTM 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 versions: 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 250V (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 -40C to +85C extended temperature range.
Ordering Information
PART MAX9634TERS+ MAX9634FERS+ MAX9634HERS+ MAX9634WERS+ MAX9634TEUK+ MAX9634FEUK+ MAX9634HEUK+ MAX9634WEUK+ PINPACKAGE 4 UCSP 4 UCSP 4 UCSP 4 UCSP 5 SOT23 5 SOT23 5 SOT23 5 SOT23 GAIN (V/V) 25 50 100 200 25 50 100 200 TOP MARK +ABX +ABY +ABZ +ACA +AFHG +AFHH +AFHI +AFHJ
Applications
Cell Phones PDAs Power-Management Systems Portable/Battery-Powered Systems Notebook Computers
+Denotes a lead(Pb)-free/RoHS-compliant package. Note: All devices are specified over the -40C to +85C extended temperature range.
UCSP is a trademark of Maxim Integrated Products, Inc.
Pin Configurations
TOP VIEW (BUMPS ON BOTTOM) RS+ 5 RSRS4
RS+
A1
A2
MAX9634T/F/H/W
GND B1 B2 OUT 1 GND
MAX9634T/F/H/W
UCSP DRAWINGS NOT TO SCALE
2 GND SOT23
3 OUT
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
1A, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier MAX9634
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 Continuous Power Dissipation (TA = +70C) 4-Bump UCSP (derate 3.0mW/C above +70C).........238mW 5-Pin SOT23 (derate 3.9mW/C above +70C)............312mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range ............................-65C to +150C Bump Temperature (soldering) Reflow............................+260C Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) .......................................+260C
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 = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER SYMBOL CONDITIONS VRS+ = 5V, TA = +25C Supply Current (Note 2) ICC VRS+ = 5V, -40C < TA < +85C VRS+ = 28V, TA = +25C VRS+ = 28V, -40C < TA < +85C Common-Mode Input Range Common-Mode Rejection Ratio VCM CMRR Guaranteed by CMRR, -40C < TA < +85C 1.6V < VRS+ < 28V, -40C < TA < +85C MAX9634T/MAX9634F/ MAX9634H Input Offset Voltage (Note 3) VOS MAX9634W MAX9634T Gain G MAX9634F MAX9634H MAX9634W MAX9634T/MAX9634F/ MAX9634H Gain Error (Note 4) GE MAX9634W Output Resistance (Note 5) ROUT TA = +25C -40C < TA < +85C TA = +25C -40C < TA < +85C 7.0 14.0 10 20 1.5 3 6 12 0.1 TA = +25C -40C < TA < +85C TA = +25C -40C < TA < +85C 25 50 100 200 0.1 V/V 100 1.6 94 130 100 250 300 250 425 V 1.1 MIN TYP 0.5 MAX 0.85 1.1 1.8 2.5 28 V dB A UNITS
0.5 0.6 0.7 0.8 13.2 26.4 7.5 15 30 85 mV k %
MAX9634T/MAX9634F/MAX9634H MAX9634W Gain = 25 Gain = 50 Gain = 100 Gain = 200
OUT Low Voltage
VOL
2
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1A, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VRS+ = VRS- = 3.6V, VSENSE = (VRS+ - VRS-) = 0V, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER OUT High Voltage SYMBOL VOH CONDITIONS VOH = VRS- - VOUT (Note 6) VSENSE = 50mV, gain = 25 Small-Signal Bandwidth (Note 5) VSENSE = 50mV, gain = 50 BW VSENSE = 50mV, gain = 100 VSENSE = 50mV, gain = 200 Output Settling Time Power-Up Time tS tON 1% final value, VSENSE = 50mV 1% final value, VSENSE = 50mV MIN TYP 0.1 125 60 30 15 100 200 s s kHz MAX 0.2 UNITS V
MAX9634
Note 1: Note 2: Note 3: Note 4:
All devices are 100% production tested at TA = +25C. All temperature limits are guaranteed by design. VOUT = 0. ICC is the total current into RS+ plus RS- pins. VOS is extrapolated from measurements for the gain-error test. 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.
Typical Operating Characteristics
(VRS+ = VRS- = 3.6V, TA = +25C, unless otherwise noted.)
INPUT OFFSET VOLTAGE HISTOGRAM
MAX9634 toc01
GAIN ERROR HISTOGRAM
MAX9634 toc02
SUPPLY CURRENT vs. TEMPERATURE
MAX9634 toc03
30 25 20 N (%)
30 25 20 N (%) 15 10 5 0
1.4 1.2 SUPPLY CURRENT (A) 1.0 0.8 3.6V 0.6 0.4 0.2 0 1.8V
28V
15 10 5 0 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 INPUT OFFSET VOLTAGE (mV)
-0.4 -0.3 -0.2 -0.1
0
0.1 0.2
0.3 0.4
-40
-15
10
35
60
85
GAIN ERROR (%)
TEMPERATURE (C)
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1A, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier MAX9634
Typical Operating Characteristics (continued)
(VRS+ = VRS- = 3.6V, TA = +25C, unless otherwise noted.)
INPUT OFFSET vs. COMMON-MODE VOLTAGE
MAX9634 toc04
INPUT OFFSET vs. TEMPERATURE
MAX9634 toc05
SUPPLY CURRENT vs. COMMON-MODE VOLTAGE
MAX9634 toc06
-30
60 50 INPUT OFFSET (V) 40 30 20 10 0
1.4 1.2 SUPPLY CURRENT (A) 1.0 0.8 0.6 0.4 0.2 0
-35 INPUT OFFSET (V)
-40
-45
-50
-55 0 5 10 15 20 25 30 COMMON-MODE VOLTAGE (V)
-40
-15
10
35
60
85
0
5
10
15
20
25
30
TEMPERATURE (C)
COMMON-MODE VOLTAGE (V)
GAIN ERROR vs. COMMON-MODE VOLTAGE
MAX9634 toc07
GAIN ERROR vs. TEMPERATURE
0.07 0.06
MAX9634 toc08
VOUT vs. VSENSE (SUPPLY = 3.6V)
3.5 3.0 G = 100 VOUT (V) 2.5 G = 50 2.0 1.5 1.0 0.5 0 G = 25
MAX9634 toc09
0.1 0 GAIN ERROR (%) -0.1 -0.2 -0.3 -0.4 -0.5 0 5 10 15 VOLTAGE (V) 20 25
0.08
4.0
GAIN ERROR (%)
0.05 0.04 0.03 0.02 0.01 0
30
-40
-15
10
35
60
85
0
50 VSENSE (mV)
100
150
TEMPERATURE (C)
VOUT vs. VSENSE (SUPPLY = 1.6V)
MAX9634 toc10
SMALL-SIGNAL GAIN vs. FREQUENCY
AV = 25V/V 0 -5 AV = 100V/V AV = 50V/V GAIN (dB)
MAX9634 toc11
CMRR vs. FREQUENCY
-20 G = 25 -40 -60 -80 -100 -120 -140 -160 G = 100 G = 50
MAX9634 toc12
1.8 1.6 1.4 1.2 VOUT (V) 1.0 0.8 0.6 0.4 0.2 0 0 20 40 60 80 G = 100 G = 50 G = 25
5
0
GAIN (dB)
-10 -15 -20 -25 -30
100
1
10
100
1k
10k
100k
1M
1
10
100
1k
10k
100k
1M
VSENSE (mV)
FREQUENCY (Hz)
FREQUENCY (Hz)
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1A, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier
Typical Operating Characteristics (continued)
(VRS+ = VRS- = 3.6V, TA = +25C, unless otherwise noted.)
MAX9634
SMALL-SIGNAL PULSE RESPONSE (GAIN = 100)
MAX9634 toc13a
SMALL-SIGNAL PULSE RESPONSE (GAIN = 50)
MAX9634 toc13b
SMALL-SIGNAL PULSE RESPONSE (GAIN = 25)
MAX9634 toc13c
15mV VSENSE 10mV VSENSE
30mV
60mV
20mV 1.5V
VSENSE
40mV 1.5V
1.5V VOUT VOUT 1V VOUT 1V 1V
20s/div
25s/div
25s/div
LARGE-SIGNAL PULSE RESPONSE (GAIN = 100)
MAX9634 toc14a
LARGE-SIGNAL PULSE RESPONSE (GAIN = 50)
MAX9634 toc14b
LARGE-SIGNAL PULSE RESPONSE (GAIN = 25)
MAX9634 toc14c
30mV VSENSE 10mV VSENSE
60mV VSENSE
120mV
10mV 3V
20mV 3V
3V VOUT 1V VOUT 0.5V VOUT 0.5V
20s/div
25s/div
25s/div
Pin Description
PIN UCSP A1 A2 B1 B2 SOT23 5 4 1, 2 3 NAME RS+ RSGND OUT FUNCTION External Sense Resistor Power-Side Connection External Sense Resistor Load-Side Connection Ground Output Voltage. VOUT is proportional to VSENSE = VRS+ - VRS-.
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1A, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier MAX9634
Typical Operating Circuit
ILOAD RSENSE
VBATT = 1.6V TO 28V RS+ R1 R1 RS-
VDD = 3.3V
LOAD
C P
MAX9634
OUT
ADC
ROUT
10k
GND
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 resistor, 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 produces an output voltage, VOUT, whose magnitude is I LOAD x R SENSE x R OUT /R 1 . The gain accuracy is based on the matching of the two gain resistors R1 and R OUT (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.
Table 1. Internal Gain-Setting Resistors (Typical Values)
GAIN (V/V) 200 100 50 25 R1 () 100 100 200 400 ROUT (k) 20 10 10 10
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.
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1A, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier
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: RSENSE = VOUT (max) G x ILOAD (max)
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 fourterminal current-sense resistor or use Kelvin (force and sense) PCB layout techniques.
MAX9634
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.
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 currentsense amplifier and reduces noise at OUT.
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 = 250V (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.
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1A, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier MAX9634
ILOAD RSENSE TO WALL-CUBE/ CHARGER RS+ R1 R1 RSRS+ R1 R1 RSLOAD
VBATT = 1.6V TO 28V
P
P
MAX9634
OUT ROUT
MAX9634
OUT
VDD = 3.3V
ROUT
10k
10k C GND ADC
GND
ADC
Figure 1. Bidirectional Application
Bidirectional Application
Battery-powered systems may require a precise bidirectional 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 testing results, refer to Application Note 1891: WaferLevel Packaging (WLP) and Its Applications.
.
Chip Information
PROCESS: BiCMOS
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1A, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.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 TYPE 2 x 2 UCSP 5 SOT23 PACKAGE CODE R41A1+1 U5-2 DOCUMENT NO. 21-0242 21-0057
MAX9634
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2x2 UCSP.EPS
9
1A, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier MAX9634
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.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.
SOT-23 5L .EPS
10
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1A, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier
Revision History
REVISION NUMBER 0 1 REVISION DATE 10/09 2/10 Initial release Corrected gain error limits in Electrical Characteristics table DESCRIPTION PAGES CHANGED -- 2
MAX9634
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
(c) 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

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