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Advanced
Monolithic
Systems
AMS124
MICROPOWER SHUNT VOLTAGE REFERENCE
RoHS compliant
FEATURES
APPLICATIONS
• Low Temperature Coefficient
• Low Output Noise
• Operating Current 50µA to 4mA
• Low Dynamic Impedance
• Tight Output Voltage Tolerance
• Available in the sub-miniature SOT-23 Package
• Battery Powered Systems
• Instrumentation
• Energy Management
• Product Testing
• Precision Audio Components
• Data Acquisition Systems
GENERAL DESCRIPTION
The AMS124 is a two-terminal micropower band-gap voltage reference diode featuring low dynamic impedance and good
temperature coefficient, operating over a 50µA to 4mA current range. On-chip trimming is used to provide tight voltage
tolerance. Since the AMS124 band-gap reference uses only transistors and resistors, low noise and good long term stability
result. The wide dynamic operating range allows its use with widely varying supplies with excellent regulation. These voltage
references can be used to make portable meters, regulators or general purpose analog circuitry.
The AMS124 is operational in the full industrial temperature range of -40°C to 85°C and is available in small space saving
SOT-23 package.
ORDERING INFORMATION:
MAX.
TEMPCO
50ppm/°C
100ppm/°C
PACKAGE TYPE
3 LEAD SOT-23
AMS124AM
AMS124BM
OPERATING
TEMP. RANGE
-40 to +85°C
-40 to +85°C
PIN CONNECTIONS
3L SOT-23
(M)
3 *
1
+
2
-
*This pin must be left floating
or connected to pin 2
Top View
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AMS124
ABSOLUTE MAXIMUM RATINGS (Note 1)
Reverse Current
Forward Current
Lead Temperature (25 sec)
5mA
10mA
265°C
Storage temperature
Internal Power Dissipation (PD)
SOT-23 Package
Thermal Resistance (θJA)
SOT-23 Package
-65°C to +150°C
0.28W
410°C/W
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR =500 µA and TA = +25°C unless otherwise specified.
Parameter
AMS124A
Min.
Typ.
Max.
Conditions
Output Voltage
1.220
Output Impedance
RMS Noise Voltage
10Hz ≤ f ≤ 10kHz
Temperature Coefficient
TA = Full Range
Turn-On Settling
0.1% of VOUT
Operating Current
(Note 3)
1.235
1.250
0.6
2
AMS124B
Min.
Typ.
Max.
1.220
5
Units
1.235
1.250
V
0.6
2
Ω
µVrms
5
50
100
15
ppm/°C
µsec
15
0.05
4
0.05
4
mA
Note1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test conditions, see the
Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed.
Note 2: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at TA = TJ = 25°C.
Note 3: Optimum performance is obtained at currents below 500µA.
TYPICAL APPLICATIONS
Shunt Regulator
Precision 1µA to 1mA Current Sources
AMS124
VS
12V
AMS124
RS
IQ + IL
AMS124
R1
20k
IL
VR
2
IQ
-
R1
20k
8
1/2
LMC6062
3
+
4
IOUT*
2
-
8
1/2
LMC6062
3
4
+
1
R2
IOUT*
-1.0V TO -12V
1.0V TO 12V
-15V
IOUT=1.2V/R2
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1
R2
AMS124
TYPICAL PERFORMANCE CHARACTERISTICS
Reverse Characteristics and
Minimum Operating Current
Temperature Drift for Different
Average Temperature Coefficient
TJ =25° C
+0.2
+12ppm/° C
+0.1
0
-0.1
-22ppm/° C
-0.3
-51ppm/° C
80
800
60
40
20
0
0
20 40 60 80
TEMPERATURE ( ° C)
100
0.4
1.2
1.6
0.8
REVERSE VOLTAGE (V)
2.0
1
10
1k
10k
100
FREQUENCY (Hz)
100k
Ouput Impedance vs Frequency
1k
IR= 1mA
TJ =25° C, ∆IR= 0.1IR
100
CL= 0
10
400
0
0
Ouput Impedance vs Frequency
1k
600
200
CL= 1µF
TANTALUM
1
IMPEDANCE (Ω)
-0.4
-0.5
-40 -20
IMPEDANCE (Ω)
VR CHANGE (%)
+0.3
IR = 200µ A
TJ =25° C
NOISE (mV/√Hz)
REVERSE CURRENT ( µA)
IR = 150µ A
+0.4
-0.2
Noise Voltage vs Frequency
1000
100
+0.5
IR= 150µA
TJ =25° C, ∆IR= 0.1IR
CL= 0
100
CL= 1µF
TANTALUM
10
1
XCL
XCL
0.1
0.1
100
1k
10k
100k
FREQUENCY (Hz)
1M
100
1k
10k
100k
FREQUENCY (Hz)
1M
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AMS124
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
3 LEAD SOT-23 PLASTIC PACKAGE (M)
0.110-0.120
(2.794-3.048)
0.015-0.017
(0.381-0.432)
0.083-0.098
(2.108-2.489)
0.047-0.055
(1.194-1.397)
0.035-0.040
(0.889-1.016)
0.018-0.024
(0.457-0.610)
10°
NOM
0.035-0.041
(0.089-1.041)
0.0034-0.0050
(0.086-0.127)
0.0005-0.0040
(0.013-0.102)
0.070-0.080
(1.778-2.032)
10°
NOM
0.018-0.024
(0.457-0.610)
(SOT-23 ) AMS DRW# 051991
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