19-4342; Rev 0; 10/08
1µA, µDFN/SC70, Lithium-Ion Battery,
Precision Current-Sense Amplifier
General Description
The MAX9610 high-side current-sense amplifier offers
precision accuracy specifications of V
OS
less than
500μV (max) and gain error less than 0.5% (max). This
device features an ultra-low 1μA quiescent supply cur-
rent. The MAX9610 fits in a tiny, 1mm x 1.5mm μDFN
package or a 5-pin SC70 package, making this part
ideal for applications in notebook computers, cell
phones, cameras, PDAs, and all lithium-ion battery-
operated portable devices where accuracy, low quies-
cent current, and small size are critical.
The MAX9610 features an input voltage range (com-
mon mode) from 1.6V to 5.5V. This input range is excel-
lent for monitoring the current of a single-cell,
lithium-ion battery (Li+), which at full charge is 4.2V,
typically 3.6V in normal use, and less than 2.9V when
ready to be recharged. These current-sense amplifiers
have a voltage output and are offered in three gain ver-
sions: 25V/V (MAX9610T), 50V/V (MAX9610F), and
100V/V (MAX9610H).
The three gain versions offer flexibility in the choice of
the external current-sense resistor. The very low 500μV
(max) input offset voltage allows small 25mV to 50mV
full-scale V
SENSE
voltage for very low voltage drop at
full-load current measurement.
The MAX9610 is offered in tiny 6-pin μDFN, (1mm x
1.5mm x 0.8mm footprint) and 5-pin SC70 packages,
specified for operation over the -40°C to +85°C temper-
ature range.
For a very similar 1.6V to 28V input voltage device in a
4-bump UCSP™ package (1mm x 1mm x 0.6mm), refer
to the MAX9938 data sheet.
Features
♦
Ultra-Low Supply Current of 1µA (max)
♦
Low 500µV (max) Input Offset Voltage
♦
Low < 0.5% (max) Gain Error
♦
Input Common Mode: +1.6V to +5.5V
♦
Voltage Output
♦
Three Gain Versions Available
25V/V (MAX9610T)
50V/V (MAX9610F)
100V/V (MAX9610H)
♦
Tiny µDFN (1mm x 1.5mm x 0.8mm) and
SC70 Packages
MAX9610
Ordering Information
PART*
MAX9610TELT+T
MAX9610FELT+T
MAX9610HELT+T
MAX9610TEXK+T
MAX9610FEXK+T
MAX9610HEXK+T
PIN-
PACKAGE
6 μDFN
6 μDFN
6 μDFN
5 SC70
5 SC70
5 SC70
GAIN
(V/V)
25
50
100
25
50
100
TOP MARK
OU
OS
OT
ATG
ATE
ATF
*All
devices are specified over the -40°C to +85°C extended
temperature range.
+Denotes
a lead-free/RoHS-compliant package.
T = Tape and reel.
Typical Operating Circuit
I
LOAD
R
SENSE
RS+
RS-
LOAD
R
1
V
BATT
=
1.6V to 5.5V
V
DD
= 3.3V
P
μC
OUT
R
1
Applications
Cell Phones
Cameras
Portable Li+ Battery Powered Systems
3.3V and 5V Power Management Systems
PDAs
USB Ports
Pin Configurations appear at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
R
OUT
10kΩ
GND
ADC
MAX9610
________________________________________________________________
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, µDFN/SC70, Lithium-Ion Battery,
Precision Current-Sense Amplifier
MAX9610
ABSOLUTE MAXIMUM RATINGS
RS+, RS- to GND......................................................-0.3V to +6V
OUT to GND .............................................................-0.3V to +6V
RS+ to RS- .............................................................................±6V
Short-Circuit Duration: OUT to GND or RS+ ..............Continuous
Continuous Input Current (Any Pin)..................................±20mA
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SC70 (derate 3.1mW/°C above +70°C) ..............247mW
6-Pin μDFN (derate 2.1mW/°C above +70°C) .............168mW
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
Package Reflow Soldering Temperature .........................+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-
) = 0, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
(Note 1)
PARAMETER
Supply Current
(Note 2)
SYMBOL
CONDITIONS
V
RS+
= 3.6V, T
A
= +25°C
I
CC
V
RS+
= 3.6V, -40°C < T
A
< +85°C
V
RS+
= 5.5V, T
A
= +25°C
V
RS+
= 5.5V, -40°C < T
A
< +85°C
Common-Mode Input Range
Common-Mode Rejection Ratio
Input Offset Voltage
V
CM
CMRR
V
OS
Guaranteed by CMRR,
-40°C < T
A
< +85°C
1.6V < V
RS+
< 5.5V, -40°C < T
A
< +85°C
T
A
= +25°C, gain = 25, 50, 100 (Note 3)
-40°C < T
A
< +85°C
MAX9610T
Gain
G
MAX9610F
MAX9610H
T
A
= +25°C, gain = 25, 50, 100 (Note 4)
Gain Error
Output Resistance
OUT Low Voltage
OUT High Voltage
GE
R
OUT
V
OL
V
OH
-40°C < T
A
< +85°C
T
A
= +25°C (Note 5)
G = 25
G = 50
G = 100
V
OH
= V
RS-
- V
OUT
(Note 6)
Gain = 25, 50
Gain = 100
7.0
10
2.5
5
10
0.1
Gain = 25, 50
Gain = 100
25
50
100
±0.1
±0.5
±0.8
±1
13.2
15
30
70
0.2
V
mV
kΩ
%
V/V
1.6
80
104
±100
±500
±600
±700
μV
0.75
MIN
TYP
0.6
MAX
1.0
1.4
1.2
1.6
5.5
V
dB
μA
UNITS
2
_______________________________________________________________________________________
1µA, µDFN/SC70, Lithium-Ion Battery,
Precision Current-Sense Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(V
RS+
= V
RS-
= 3.6V, V
SENSE
= (V
RS+
- V
RS-
) = 0, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
(Note 1)
PARAMETER
Small-Signal Bandwidth
Output Settling Time
Power-Up Time
SYMBOL
BW
t
S
t
ON
CONDITIONS
V
SENSE
= 50mV, G = 25
V
SENSE
= 50mV, G = 50
V
SENSE
= 50mV, G = 100
1% final value, V
SENSE
= 25mV
1% final value, V
SENSE
= 25mV
MIN
TYP
170
110
60
35
100
μs
μs
kHz
MAX
UNITS
MAX9610
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
= 0V. I
CC
is the total current into RS+ plus RS-.
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:
G = 25: V
SENSE
20mV and 120mV
G = 50: V
SENSE
10mV and 60mV
G = 100: V
SENSE
5mV and 30mV
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.)
MAX9610F
OFFSET VOLTAGE HISTOGRAM
MAX9610 toc01
MAX9610F
GAIN ACCURACY HISTOGRAM
MAX9610 toc02
SUPPLY CURRENT
vs. TEMPERATURE
900
800
SUPPLY CURRENT (nA)
700
600
500
400
300
200
100
1.6V
3.6V
5.5V
MAX9610 toc03
20
30
25
20
1000
15
N (%)
10
N (%)
15
10
5
5
0
-250 -200-150-100 -50
0
50 100 150 200 250
OFFSET VOLTAGE (μV)
0
-0.2 -0.15 -0.1 -0.05
0
0.05 0.1 0.15 0.2
GAIN ACCURACY (%)
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
_______________________________________________________________________________________
3
1µA, µDFN/SC70, Lithium-Ion Battery,
Precision Current-Sense Amplifier
MAX9610
Typical Operating Characteristics (continued)
(V
RS+
= V
RS-
= 3.6V, T
A
= +25°C.)
SUPPLY CURRENT
vs. COMMON-MODE VOLTAGE
MAX9610 toc04
OFFSET VOLTAGE
vs. TEMPERATURE
MAX9610 toc05
OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
MAX9610 toc06
1.00
0.90
0.80
SUPPLY CURRENT (μA)
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0
1.6
2.1
2.6
3.1
3.6
4.1
4.6
100
90
80
OFFSET VOLTAGE (μV)
70
60
50
40
30
20
10
0
60
50
OFFSET VOLTAGE (μV)
40
30
20
10
0
5.5
-40
-15
10
35
60
85
1.6
2.1
2.6
3.1
3.6
4.1
4.6
5.1 5.5
COMMON-MODE VOLTAGE (V)
TEMPERATURE (°C)
COMMON-MODE VOLTAGE (V)
GAIN ERROR vs. TEMPERATURE
MAX9610 toc07
GAIN ERROR
vs. COMMON-MODE VOLTAGE
MAX9610 toc08
V
OUT
vs. V
SENSE
V
RS+
= 5.5V
MAX9610 toc09
0.25%
0.23%
0.21%
GAIN ERROR (%)
0.19%
0.17%
0.15%
0.13%
0.11%
0.09%
0.07%
0.05%
-40
-15
10
35
60
0%
-0.02%
-0.04%
GAIN ERROR (%)
-0.06%
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
50
100
G = 25
G = 50
G = 100
V
OUT
(V)
-0.08%
-0.10%
-0.12%
-0.14%
-0.16%
-0.18%
-0.20%
85
1.6
2.1
2.6
3.1
3.6
4.1
4.6
5.1 5.5
150
200
250
TEMPERATURE (°C)
COMMON-MODE VOLTAGE (V)
V
SENSE
(mV)
V
OUT
vs. V
SENSE
V
RS+
= 1.6V
MAX9610 toc10
NORMALIZED GAIN
vs. FREQUENCY
MAX9610 toc11
CMRR vs. FREQUENCY
MAX9610 toc12
1.8
1.6
1.4
1.2
V
OUT
(V)
1.0
0.8
0.6
0.4
G = 100
G = 50
G = 25
5
0
NORMALIZED GAIN (dB)
G = 100
G = 50
-10
-15
-20
G = 25
-5
-20
-40
-60
CMRR (dB)
-80
-100
-120
-140
0.2
0
0
10
20
30
40
50
60
70
80
V
SENSE
(mV)
-25
0.1
1
10
FREQUENCY (kHz)
100
1000
10
100
1k
FREQUENCY (Hz)
10k
100k
4
_______________________________________________________________________________________
1µA, µDFN/SC70, Lithium-Ion Battery,
Precision Current-Sense Amplifier
Typical Operating Characteristics (continued)
(V
RS+
= V
RS-
= 3.6V, T
A
= +25°C.)
SMALL-SIGNAL RESPONSE
G = 25
MAX9610 toc13
MAX9610
SMALL-SIGNAL RESPONSE
G = 50
MAX9610 toc14
V
SENSE
20mV/div
V
SENSE
10mV/div
V
OUT
200mV/div
V
OUT
200mV/div
10μs/div
10μs/div
SMALL-SIGNAL RESPONSE
G = 100
MAX9610 toc15
LARGE-SIGNAL RESPONSE
G = 25
MAX9610 toc16
V
SENSE
5mV/div
V
SENSE
100mV/div
V
OUT
200mV/div
V
OUT
1V/div
10μs/div
10μs/div
LARGE-SIGNAL RESPONSE
G = 50
MAX9610 toc17
LARGE-SIGNAL RESPONSE
G = 100
MAX9610 toc18
V
SENSE
50mV/div
V
SENSE
20mV/div
V
OUT
1V/div
V
OUT
1V/div
10μs/div
10μs/div
_______________________________________________________________________________________
5
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