ADMOS AMS255A

Advanced
Monolithic
Systems
AMS255
MICROPOWER SHUNT VOLTAGE REFERENCE
FEATURES
APPLICATIONS
• Low Temperature Coefficient
• Low Output Noise
• Operating Current 100µ
µ A to 5mA
• Low Dynamic Impedance
• Tight Output Voltage Tolerance
• Available in the sub-miniature SOT-23 Package
• Battery Powered Systems
• Instrumentation
• Energy Management
• Automotive
• Precision Audio Components
• Data Acquisition Systems
GENERAL DESCRIPTION
The AMS255 is a two-terminal band-gap voltage reference diode featuring low dynamic impedance and good temperature
coefficient, operating over a 100µA to 5mA current range. On-chip trimming is used to provide tight voltage tolerance. Since
the AMS255 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 AMS255 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
AMS255AM
AMS255BM
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
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS255
ABSOLUTE MAXIMUM RATINGS (Note 1)
Reverse Current
Forward Current
Lead Temperature
SOT-23 packages:
Vapor phase (60 sec)
Infrared (15 sec.)
10mA
10mA
Storage temperature
Internal Power Dissipation (PD)
SOT-23 Package
Thermal Resistance (θJA)
SOT-23 Package
215°C
220°C
-65°C to +150°C
0.28W
410°C/W
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR =1000 µA and TA = +25°C unless otherwise specified.
Parameter
Conditions
Output Voltage
AMS255A
Min.
Typ.
Max.
AMS255B
Min.
Typ.
Max.
2.475
2.450
Output Impedance
RMS Noise Voltage
10Hz ≤ f ≤ 10kHz
Temperature Coefficient
TA = Full Range
Turn-On Settling
0.1% of VOUT
(Note 3)
Operating Current
2.500
2.525
0.6
2
15
2.500
2.550
V
0.6
2
Ω
µVrms
30
60
100
30
5
0.1
ppm/°C
µsec
30
0.1
Units
5
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 1000µA.
TYPICAL APPLICATIONS
Precision ± 2.500V Reference
Shunt Regulator
VS
RS
+5V ±5%
IQ + IL
VR
AMS255
904Ω, 1%
IL
IQ
+2.500V
AMS255
47kΩ, 0.1%
47kΩ, 0.1%
+5V
0.1µF
1/2
LMC6062
-2.500V
+
0.1µF
-5V
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS255
TYPICAL APPLICATIONS
Precision 1µ
µ A to 1mA Current Sources
AMS255
12V
AMS255
R1
20k
2
-
R1
20k
8
1/2
LMC6062
3
2
4
+
IOUT*
-
8
1/2
LMC6062
3
4
+
1
R2
IOUT*
-1.0V TO -12V
1
R2
1.0V TO 12V
-15V
IOUT=2.5V/R2
TYPICAL PERFORMANCE CHARACTERISTICS
Reverse Characteristics and
Minimum Operating Current
Temperature Drift for Different
Average Temperature Coefficient
REVERSE CURRENT (µA)
I R = 150 µ A
+0.4
VR CHANGE (%)
+0.3
+0.2
+12ppm/° C
+0.1
0
-0.1
-0.2
-22ppm/° C
-0.3
-51ppm/° C
-0.4
-0.5
-40 -20
Noise Voltage vs Frequency
120
10
80
60
40
20
100
2
6
8
4
REVERSE VOLTAGE (V)
10
0.5
1
10
1k
10k
100
FREQUENCY (Hz)
100k
Ouput Impedance vs Frequency
1k
100
IMPEDANCE (Ω)
IMPEDANCE (Ω)
1.0
0.1
0
IR= 100 mA
TJ =25° C, ∆IR= 0.1I R
C L= 0
C L= 1 µF
TANTALUM
10
2.0
0.2
Ouput Impedance vs Frequency
1k
T J =25° C
5.0
0
0 20 40 60 80
TEMPERATURE ( ° C)
I R = 200 µ A
TJ =25° C
100
NOISE (mV/√Hz)
+0.5
1
IR= I RMIN+100µA
TJ =25° C, ∆IR= 0.1I R
C L= 0
100
C L= 1 µF
TANTALUM
10
1
XC L
XC L
0.1
0.1
100
1k
10k
100k
FREQUENCY (Hz)
Advanced Monolithic Systems, Inc.
1M
100
1k
10k
100k
FREQUENCY (Hz)
1M
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS255
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
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140