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TSM9938 데이터시트 PDF




Touchstone Semiconductor에서 제조한 전자 부품 TSM9938은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 TSM9938 자료 제공

부품번호 TSM9938 기능
기능 SOT23 Precision Current-Sense Amplifier
제조업체 Touchstone Semiconductor
로고 Touchstone Semiconductor 로고


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TSM9938 데이터시트, 핀배열, 회로
www.DataSheet.co.kr
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
APPLICATIONS
Notebook Computers
Power Management Systems
Portable/Battery-Powered Systems
PDAs
Smart Phones
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) VOS
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.
TYPICAL APPLICATION CIRCUIT
The Touchstone Semiconductor logo is a registered
trademark of Touchstone Semiconductor, Incorporated.
Input Offset Voltage Histogram
35
30
25
20
15
10
5
0
0 10 20 30 40 50
INPUT OFFSET VOLTAGE - µV
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.
Datasheet pdf - http://www.DataSheet4U.net/




TSM9938 pdf, 반도체, 판매, 대치품
www.DataSheet.co.kr
TSM9938
TYPICAL PERFORMANCE CHARACTERISTICS
VRS+ = VRS- = 3.6V; TA = +25°C, unless otherwise noted.
Input Offset Voltage Histogram
Gain Error Histogram
35 30
30 25
25
20
20
15
15
10 10
55
0
0 10 20 30 40 50
INPUT OFFSET VOLTAGE - µV
0
-0.4
-0.2 0 0.2
GAIN ERROR - %
0.4
Supply Current vs Temperature
1
28V
0.8
0.6 1.8V
0.4 3.6V
0.2
Input Offset Voltage vs Common-Mode Voltage
40
35
30
25
0
-40
-15 10 35 60
TEMPERATURE - °C
85
Input Offset Voltage vs Temperature
80
60
20
0
5 10 15 20 25
SUPPLY VOLTAGE - Volt
30
Supply Current vs Common-Mode Voltage
1
0.8
40 0.6
20 0.4
0 0.2
-20
-40
Page 4
-15 10 35 60
TEMPERATURE - °C
85
0
0
5 10 15 20 25
SUPPLY VOLTAGE - Volt
30
TSM9938DS r1p0
RTFDS
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TSM9938 전자부품, 판매, 대치품
www.DataSheet.co.kr
TSM9938
PIN FUNCTIONS
PIN
SOT23
5
4
1, 2
3
LABEL
RS+
RS-
GND
OUT
FUNCTION
External Sense Resistor Power-Side Connection
External Sense Resistor Load-Side Connection
Ground. Connect these pins to analog ground.
Output Voltage. VOUT is proportional to VSENSE = VRS+ - VRS-
BLOCK DIAGRAMS
DESCRIPTION OF OPERATION
The internal configuration of the TSM9938 a
unidirectional high-side, current-sense amplifier - is
based on a commonly-used operational amplifier (op
amp) circuit for measuring load currents (in one
direction) in the presence of high-common-mode
voltages. In the general case, a current-sense
amplifier monitors the voltage caused by a load
current through an external sense resistor and
generates an output voltage as a function of that load
current. Referring to the typical application circuit on
Page 1, the inputs of the op-amp-based circuit are
connected across an external RSENSE resistor that
is used to measure load current. At the non-inverting
input of the TSM9938 (the RS+ terminal), the applied
voltage is ILOAD x RSENSE. Since the RS- terminal is
the non-inverting input of the internal op amp, op-amp
feedback action forces the inverting input of the
internal op amp to the same potential
(ILOAD x RSENSE). Therefore, the voltage drop across
TSM9938DS r1p0
RSENSE (VSENSE) and the voltage drop across R1 (at
the RS+ terminal) are equal. To minimize any
additional error because of op-amp input bias current
mismatch, both R1s are the same value.
Since the internal p-channel FET’s source is
connected to the inverting input of the internal op
amp and since the voltage drop across R1 is the
same as the external VSENSE, op amp feedback action
drives the gate of the FET such that the FET’s drain-
source current is equal to:
IS
VSENSE
R1
Page 7
RTFDS
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