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Advanced AMS124
Monolithic MICROPOWER SHUNT VOLTAGE REFERENCE
Systems
RoHS compliant
FEATURES APPLICATIONS
• Low Temperature Coefficient • Battery Powered Systems
• Low Output Noise • Instrumentation
• Operating Current 50µA to 4mA • Energy Management
• Low Dynamic Impedance • Product Testing
• Tight Output Voltage Tolerance • Precision Audio Components
• Available in the sub-miniature SOT-23 Package • 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. PACKAGE TYPE OPERATING
TEMPCO
50ppm/°C
100ppm/°C
3 LEAD SOT-23
AMS124AM
AMS124BM
PIN CONNECTIONS
3L SOT-23
(M)
:
TEMP. RANGE
-40 to +85°C
-40 to +85°C
3 *
21
+-
*This pin must be left floating
or connected to pin 2
Top View
AMS124
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ABSOLUTE MAXIMUM RATINGS (Note 1)
Reverse Current 5mA Storage temperature
)
)
D
Forward Current 10mA Internal Power Dissipation (P
Lead Temperature (25 sec)
265°C
SOT-23 Package 0.28W
Thermal Resistance (θ
JA
SOT-23 Package
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR =500 µA and TA = +25°C unless otherwise specified.
Parameter
Output Voltage 1.220 1.235 1.250 1.220 1.235 1.250 V
Output Impedance
Conditions
AMS124A
Min. Typ. Max.
AMS124B
Min. Typ. Max.
0.6 2 0.6 2
-65°C to +150°C
410°C/W
Units
Ω
RMS Noise Voltage
10Hz
≤ f ≤ 10kHz
Temperature Coefficient TA = Full Range
Turn-On Settling 0.1% of V
OUT
5 5
50
100
15 15
µV
ppm/°C
µsec
Operating Current (Note 3) 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
Note 2: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at T
. The guaranteed specifications apply only for the test conditions listed.
= TJ = 25°C.
A
Note 3: Optimum performance is obtained at currents below 500µA.
TYPICAL APPLICATIONS
Shunt Regulator
V
S
IQ + I
R
S
V
R
I
AMS124
Q
L
I
L
I
*
-1.0V TO -12V
OUT
Precision 1µA to 1mA Current Sources
AMS124
R1
20k
2
-
8
3
1/2
LMC6062
+
-15V
1
4
R2
1.0V TO 12V
I
=1.2V/R2
OUT
12V
AMS124
R1
20k
2
8
1/2
LMC6062
43
+
I
*
OUT
rms
1
R2
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TYPICAL PERFORMANCE CHARACTERISTICS
Temperature Drift for Different
Average Temperature Coefficient
+0.5
+0.4
+0.3
+0.2
+0.1
0
-0.1
CHANGE (%)
R
-0.2
V
-0.3
-0.4
-0.5
-40 -20 0 20 40 60 80
-22ppm/° C
-51ppm/° C
TEMPERATURE ( ° C)
1k
100
)
Ω
IR = 150µ A
+12ppm/° C
100
Ouput Impedance vs Frequency
IR= 1mA
TJ =25° C, ∆IR= 0.1I
Reverse Characteristics and
Minimum Operating Current
100
A)
80
µ
60
40
20
REVERSE CURRENT (
0
0.4
0
REVERSE VOLTAGE (V)
R
CL= 0
0.8
Noise Voltage vs Frequency
TJ =25° C IR = 200µ A
1.2 1.6
)
Ω
2.0
Ouput Impedance vs Frequency
1k
100
1000
800
Hz)
√
600
400
NOISE (mV/
200
0
110
IR= 150µA
TJ =25° C, ∆IR= 0.1I
100
FREQUENCY (Hz)
R
CL= 0
AMS124
TJ =25° C
1k 10k
100k
10
IMPEDANCE (
1
0.1
100 1k 10k 100k
FREQUENCY (Hz)
C
= 1µF
L
TANTALUM
XC
L
1M
10
IMPEDANCE (
1
0.1
100 1k 10k 100k
FREQUENCY (Hz)
CL= 1µF
TANTALUM
XC
L
1M
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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)
AMS124
0.018-0.024
(0.457-0.610)
0.035-0.041
(0.089-1.041)
0.0005-0.0040
(0.013-0.102)
0.070-0.080
(1.778-2.032)
10°
NOM
10°
NOM
0.018-0.024
(0.457-0.610)
0.0034-0.0050
(0.086-0.127)
(SOT-23 ) AMS DRW# 051991
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