19-5021; Rev 1; 2/10
KIT
ATION
EVALU
BLE
AVAILA
1µA, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
General Description
Features
o
Ultra-Low Supply Current of 1µA (max)
o
Low 250µV (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
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 accura-
cy, 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 250µV
(max) input offset voltage allows small 25mV to 50mV
full-scale V
SENSE
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 extend-
ed temperature range.
Ordering Information
PART
MAX9634TERS+
MAX9634FERS+
MAX9634HERS+
MAX9634WERS+
MAX9634TEUK+
MAX9634FEUK+
MAX9634HEUK+
MAX9634WEUK+
PIN-
PACKAGE
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 -40°C to +85°C
extended temperature range.
UCSP is a trademark of Maxim Integrated Products, Inc.
Pin Configurations
TOP VIEW
(BUMPS ON BOTTOM)
RS+
5
RS-
RS-
4
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.
1µA, 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 (T
A
= +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
Bump Temperature (soldering) Reflow............................+260°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
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
RS+
= V
RS-
= 3.6V, V
SENSE
= (V
RS+
- V
RS-
) = 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
V
RS+
= 5V, T
A
= +25°C
Supply Current (Note 2)
I
CC
V
RS+
= 5V, -40°C < T
A
< +85°C
V
RS+
= 28V, T
A
= +25°C
V
RS+
= 28V, -40°C < T
A
< +85°C
Common-Mode Input Range
Common-Mode Rejection Ratio
V
CM
CMRR
Guaranteed by CMRR, -40°C < T
A
< +85°C
1.6V < V
RS+
< 28V, -40°C < T
A
< +85°C
MAX9634T/MAX9634F/
MAX9634H
Input Offset Voltage (Note 3)
V
OS
MAX9634W
MAX9634T
Gain
G
MAX9634F
MAX9634H
MAX9634W
MAX9634T/MAX9634F/
MAX9634H
Gain Error (Note 4)
GE
MAX9634W
Output Resistance (Note 5)
R
OUT
T
A
= +25°C
-40°C < T
A
< +85°C
T
A
= +25°C
-40°C < T
A
< +85°C
7.0
14.0
10
20
1.5
3
6
12
±0.1
T
A
= +25°C
-40°C < T
A
< +85°C
T
A
= +25°C
-40°C < T
A
< +85°C
25
50
100
200
±0.1
V/V
100
1.6
94
130
100
250
300
250
425
µV
1.1
MIN
TYP
0.5
MAX
0.85
1.1
1.8
2.5
28
V
dB
µA
UNITS
±0.5
±0.6
±0.7
±0.8
13.2
26.4
7.5
15
30
85
mV
kΩ
%
MAX9634T/MAX9634F/MAX9634H
MAX9634W
Gain = 25
Gain = 50
Gain = 100
Gain = 200
OUT Low Voltage
V
OL
2
_______________________________________________________________________________________
1µA, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(V
RS+
= V
RS-
= 3.6V, V
SENSE
= (V
RS+
- V
RS-
) = 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
OUT High Voltage
SYMBOL
V
OH
CONDITIONS
V
OH
= V
RS-
- V
OUT
(Note 6)
V
SENSE
= 50mV, gain = 25
Small-Signal Bandwidth
(Note 5)
V
SENSE
= 50mV, gain = 50
BW
V
SENSE
= 50mV, gain = 100
V
SENSE
= 50mV, gain = 200
Output Settling Time
Power-Up Time
t
S
t
ON
1% final value, V
SENSE
= 50mV
1% final value, V
SENSE
= 50mV
MIN
TYP
0.1
125
60
30
15
100
200
µs
µs
kHz
MAX
0.2
UNITS
V
MAX9634
Note 1:
Note 2:
Note 3:
Note 4:
All devices are 100% production tested at T
A
= +25°C. All temperature limits are guaranteed by design.
V
OUT
= 0. I
CC
is the total current into RS+ plus RS- pins.
V
OS
is extrapolated from measurements for the gain-error test.
Gain error is calculated by applying two values of V
SENSE
and calculating the error of the slope vs. the ideal:
Gain = 25, V
SENSE
is 20mV and 120mV.
Gain = 50, V
SENSE
is 10mV and 60mV.
Gain = 100, V
SENSE
is 5mV and 30mV.
Gain = 200, V
SENSE
is 2.5mV and 15mV.
Note 5:
The device is stable for any external capacitance value.
Note 6:
V
OH
is the voltage from V
RS-
to V
OUT
with V
SENSE
= 3.6V/gain.
Typical Operating Characteristics
(V
RS+
= V
RS-
= 3.6V, T
A
= +25°C, 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 (µA)
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)
_______________________________________________________________________________________
3
1µA, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
MAX9634
Typical Operating Characteristics (continued)
(V
RS+
= V
RS-
= 3.6V, T
A
= +25°C, 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 (µV)
40
30
20
10
0
1.4
1.2
SUPPLY CURRENT (µA)
1.0
0.8
0.6
0.4
0.2
0
-35
INPUT OFFSET (µV)
-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
V
OUT
vs. V
SENSE
(SUPPLY = 3.6V)
3.5
3.0
G = 100
V
OUT
(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
V
SENSE
(mV)
100
150
TEMPERATURE (°C)
V
OUT
vs. V
SENSE
(SUPPLY = 1.6V)
MAX9634 toc10
SMALL-SIGNAL GAIN
vs. FREQUENCY
A
V
= 25V/V
0
-5
A
V
= 100V/V
A
V
= 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
V
OUT
(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
V
SENSE
(mV)
FREQUENCY (Hz)
FREQUENCY (Hz)
4
_______________________________________________________________________________________
1µA, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
Typical Operating Characteristics (continued)
(V
RS+
= V
RS-
= 3.6V, T
A
= +25°C, 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
V
SENSE
10mV
V
SENSE
30mV
60mV
20mV
1.5V
V
SENSE
40mV
1.5V
1.5V
V
OUT
V
OUT
1V
V
OUT
1V
1V
20µs/div
25µs/div
25µs/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
V
SENSE
10mV
V
SENSE
60mV
V
SENSE
120mV
10mV
3V
20mV
3V
3V
V
OUT
1V
V
OUT
0.5V
V
OUT
0.5V
20µs/div
25µs/div
25µs/div
Pin Description
PIN
UCSP
A1
A2
B1
B2
SOT23
5
4
1, 2
3
NAME
RS+
RS-
GND
OUT
FUNCTION
External Sense Resistor Power-Side Connection
External Sense Resistor Load-Side Connection
Ground
Output Voltage. V
OUT
is proportional to V
SENSE
= V
RS+
- V
RS-
.
_______________________________________________________________________________________
5
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