TSM9938
A 1µA, SOT23 Precision Current-Sense Amplifier
FEATURES
♦ Alternate-source for MAX9938
♦ Ultra-Low Supply Current: 1μA
♦ Wide Input Common Mode Range: +1.6V to +28V
♦ Low Input Offset Voltage: 500μV (max)
♦ Low Gain Error: <0.5% (max)
♦ Voltage Output
♦ Four Gain Options Available:
TSM9938T: Gain = 25V/V
TSM9938F: Gain = 50V/V
TSM9938H: Gain = 100V/V
TSM9938W: Gain = 200V/V
♦ 5-Pin SOT23 Packaging
DESCRIPTION
The
voltage-output
TSM9938
current-sense
amplifiers are electrically and form-factor identical to
the MAX9938 current-sense amplifiers. Consuming a
very low 1μA supply current, the TSM9938 high-side
current-sense amplifiers exhibit a 500-µV (max) V
OS
and a 0.5% (max) gain error, both specifications
optimized for any precision current measurement. For
all high-side current-sensing applications, the
TSM9938 features a wide input common-mode
voltage range from 1.6V to 28V.
The SOT23 package makes the TSM9938 an ideal
choice for pcb-area-critical, low-current, high-
accuracy current-sense applications in all battery-
powered portable instruments.
All TSM9938s are specified for operation over the
-40°C to +85°C extended temperature range.
APPLICATIONS
Notebook Computers
Power Management Systems
Portable/Battery-Powered Systems
PDAs
Smart Phones
TYPICAL APPLICATION CIRCUIT
Input Offset Voltage Histogram
35
30
PERCENT OF UNITS - %
25
20
15
10
5
0
0
10
20
30
40
50
INPUT OFFSET VOLTAGE - µV
The Touchstone Semiconductor logo is a registered
trademark of Touchstone Semiconductor, Incorporated.
PART
TSM9938T
TSM9938F
TSM9938H
TSM9938W
GAIN OPTION
25 V/V
50 V/V
100 V/V
200 V/V
Page 1
© 2011 Touchstone Semiconductor, Inc. All rights reserved.
TSM9938
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)
5-Pin SOT23 (Derate at 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
Electrical and thermal 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 condition beyond those indicated in the operational sections
of the specifications is not implied. Exposure to any absolute maximum rating conditions for extended periods may affect device reliability and
lifetime.
PACKAGE/ORDERING INFORMATION
ORDER NUMBER
PART MARKING CARRIER QUANTITY
TSM9938TEUK+TP
TSM9938TEUK+T
TSM9938FEUK+TP
TADA
TSM9938FEUK+T
TSM9938HEUK+TP
TADF
TSM9938HEUK+T
TSM9938WEUK+TP
TADH
TSM9938WEUK+T
TADC
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
-----
3000
-----
3000
-----
3000
-----
3000
Lead-free Program:
Touchstone Semiconductor supplies only lead-free packaging.
Consult Touchstone Semiconductor for products specified with wider operating temperature ranges.
Page 2
TSM9938DS r1p0
RTFDS
TSM9938
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. See Note 1
PARAMETER
Supply Current (Note 2)
Common-Mode Input Range
Common-Mode Rejection
Ratio
Input Offset Voltage (Note 3)
SYMBOL
I
CC
V
CM
CMRR
V
OS
CONDITIONS
V
RS+
= 5V, T
A
= +25°C
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
Guaranteed by CMRR , -40°C < T
A
< +85°C
1.6V < V
RS+
< 28V, -40°C < T
A
< +85°C
T
A
= +25°C
-40°C < T
A
< +85°C
TSM9938T
TSM9938F
TSM9938H
TSM9938W
TSM9938T/TSM9938F/
TSM9938H
TSM9938W
Output Resistance
R
OUT
(Note 5)
Gain = 25
Gain = 50
Gain = 100
Gain = 200
V
OH
= V
RS-
- V
OUT
(Note 6)
MIN
TYP
0.5
1.1
1.6
94
130
±100
25
50
100
200
±0.1
±0.1
7.0
14.0
10
20
1.5
3
6
12
0.1
±500
±600
MAX
0.85
1.1
1.8
2.5
28
UNITS
μA
V
dB
μV
Gain
G
V/V
±0.5
±0.6
±0.7
±0.8
13.2
26.4
15
30
60
120
0.2
Gain Error (Note 4)
GE
T
A
= +25°C
-40°C < T
A
< +85°C
T
A
= +25°C
-40°C < T
A
< +85°C
TSM9938T/F/H
TSM9938W
%
kΩ
OUT Low Voltage
OUT High Voltage
V
OL
V
OH
mV
V
Note 1:
All devices are 100% production tested at T
A
= +25°C. All temperature limits are guaranteed by product
characterization.
Note 2:
Extrapolated to V
OUT
= 0. I
CC
is the total current into the RS+ and the RS- pins.
Note 3:
Input offset voltage V
OS
is extrapolated from V
OUT
with V
SENSE
set to 1mV.
Note 4:
Gain error is calculated by applying two values for V
SENSE
and then calculating the error of the actual slope vs. the
ideal transfer characteristic:
For GAIN = 25, the applied V
SENSE
is 20mV and 120mV.
For GAIN = 50, the applied V
SENSE
is 10mV and 60mV.
For GAIN = 100, the applied V
SENSE
is 5mV and 30mV.
For GAIN = 200, the applied V
SENSE
is 2.5mV and 15mV.
Note 5:
The device is stable for any capacitive load at V
OUT
.
Note 6:
V
OH
is the voltage from V
RS-
to V
OUT
with V
SENSE
= 3.6V/GAIN.
TSM9938DS r1p0
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TSM9938
TYPICAL PERFORMANCE CHARACTERISTICS
V
RS+
= V
RS-
= 3.6V; T
A
= +25°C, unless otherwise noted.
Input Offset Voltage Histogram
35
30
PERCENT OF UNITS - %
25
20
15
10
5
0
0
10
20
30
40
50
PERCENT OF UNITS - %
30
25
20
15
10
5
0
-0.4
-0.2
0
0.2
0.4
Gain Error Histogram
INPUT OFFSET VOLTAGE - µV
Supply Current vs Temperature
1
28V
INPUT OFFSET VOLTAGE - µV
GAIN ERROR - %
Input Offset Voltage vs Common-Mode Voltage
40
SUPPLY CURENT - µA
0.8
35
0.6
3.6V
1.8V
30
0.4
25
0.2
0
-40
-15
10
35
60
85
20
0
5
10
15
20
25
30
TEMPERATURE -
°C
Input Offset Voltage vs Temperature
80
INPUT OFFSET VOLTAGE - µV
1
SUPPLY VOLTAGE - Volt
Supply Current vs Common-Mode Voltage
40
SUPPLY CURRENT - µA
-40
-15
35
60
85
60
0.8
0.6
20
0.4
0
-20
10
0.2
0
0
5
10
15
20
25
30
TEMPERATURE -
°C
SUPPLY VOLTAGE - Volt
Page 4
TSM9938DS r1p0
RTFDS
TSM9938
TYPICAL PERFORMANCE CHARACTERISTICS
V
RS+
= V
RS-
= 3.6V; T
A
= +25°C, unless otherwise noted.
Gain Error vs Common-Mode Voltage
0.3
0.5
0.4
GAIN ERROR - %
0.2
GAIN ERROR - %
0.3
0.2
0.1
0
0
0
5
10
15
20
25
30
SUPPLY VOLTAGE - Volt
V
OUT
vs V
SENSE
@ Supply = 3.6V
4
G = 100
3.5
3
G = 50
V
OUT
- V
V
OUT
- V
2.5
2
1.5
1
0.5
0
0
50
100
150
G = 25
1.0
G = 50
0.8
0.6
0.4
0.2
0
0
20
40
60
80
100
V
SENSE
- mV
Common-Mode Rejection vs Frequency
0
COMMON-MODE REJECTION - dB
G = 50
G = 100
G = 25
-20
-40
-60
G = 25
-80
-100
-120
-140
0.001 0.01 0.1
G = 50, 100
G = 25
1.4
1.2
G = 100
1.6
-0.1
-40
Gain Error vs. Temperature
0.1
-15
10
35
60
85
TEMPERATURE -
°C
V
OUT
vs V
SENSE
@ Supply = 1.6V
V
SENSE
- mV
Small-Signal Gain vs Frequency
5
0
SMALL-SIGNAL GAIN -dB
-5
-10
-15
-20
-25
-30
-35
0.001 0.01 0.1
1
10
100
1000
1
10
100 1000
FREQUENCY - kHz
FREQUENCY - kHz
TSM9938DS r1p0
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