Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
Advanced
AMS255
Monolithic
MICROPOWER SHUNT VOLTAGE REFERENCE
Systems
FEATURES
APPLICATIONS
Low Temperature Coefficient
Battery Powered Systems
Low Output Noise
Instrumentation
Operating Current 100
A to 5mA
Energy Management
Low Dynamic Impedance
Automotive
Tight Output Voltage Tolerance
Precision Audio Components
Available in the sub-miniature SOT-23 Package
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 100
A 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.
PACKAGE TYPE
OPERATING
TEMPCO
3 LEAD SOT-23
TEMP. RANGE
50ppm/
C
AMS255AM
-40 to +85
C
100ppm/
C
AMS255BM
-40 to +85
C
PIN CONNECTIONS
3L SOT-23
(M)
+
-
3 *
2
1
*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
10mA
Storage temperature
-65
C to +150
C
Forward Current
10mA
Internal Power Dissipation (P
D
)
Lead Temperature
SOT-23 Package
0.28W
SOT-23 packages:
Thermal Resistance (
JA
)
Vapor phase (60 sec)
215
C
SOT-23 Package
410
C/W
Infrared (15 sec.)
220
C
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
R
=1000
A and T
A
= +25C unless otherwise specified.
Parameter
Conditions
AMS255A
Min. Typ. Max.
AMS255B
Min. Typ. Max.
Units
Output Voltage
2.475
2.500
2.525
2.450
2.500
2.550
V
Output Impedance
0.6
2
0.6
2
RMS Noise Voltage
10Hz
f
10kHz
15
30
V
rms
Temperature Coefficient
T
A
= Full Range
60
100
ppm/
C
Turn-On Settling
0.1% of V
OUT
30
30
sec
Operating Current
(Note 3)
0.1
5
0.1
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 T
A
= T
J
= 25C.
Note 3:
Optimum performance is obtained at currents below 1000
A.
TYPICAL APPLICATIONS
Shunt Regulator
Precision
2.500V Reference
AMS255
I
Q
I
Q
+ I
L
I
L
R
S
V
R
V
S
AMS255
904
, 1%
+5V 5%
+
-
1/2
LMC6062
47
k
, 0.1%
0.1
F
+5V
+2.500V
-2.500V
47
k
, 0.1%
0.1
F
-5V
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS255
TYPICAL APPLICATIONS
Precision 1
A to 1mA Current Sources
8
4
3
2
+
-
1/2
LMC6062
1
AMS255
R2
R1
20k
-15V
-1.0V TO -12V
I
OUT
*
I
OUT
=2.5V/R2
8
4
3
2
+
-
1/2
LMC6062
1
R2
R1
20k
12V
1.0V TO 12V
I
OUT
*
AMS255
TYPICAL PERFORMANCE CHARACTERISTICS
-40
-20
0
20
40
60
80
-0.5
+0.5
0
100
-0.1
-0.2
-0.3
-0.4
+0.4
+0.3
+0.2
+0.1
Temperature Drift for Different
Average Temperature Coefficient
TEMPERATURE ( C)
V
R
CHANGE (%)
I
R
= 150
A
0
2
4
6
8
0
80
40
Reverse Characteristics and
Minimum Operating Current
10
REVERSE VOLTAGE (V)
REVERSE CURRENT (
A)
20
120
100
T
J
=25 C
0.1
1
10
100
1k
100
1k
10k
100k
Ouput Impedance vs Frequency
FREQUENCY (Hz)
NOISE (mV/
Hz)
1M
0.1
1
10
100
1k
100
1k
10k
100k
FREQUENCY (Hz)
1M
1
10
100
1k
10k
0.1
5.0
1.0
Noise Voltage vs Frequency
100k
FREQUENCY (Hz)
IMPEDANCE (
)
0.2
10
2.0
T
J
=25 C,
I
R
= 0.1I
R
I
R
= I
RMIN
+100
A
IMPEDANCE (
)
I
R
= 200
A
T
J
=25 C
0.5
Ouput Impedance vs Frequency
60
+12ppm/ C
-51ppm/ C
-22ppm/ C
I
R
= 100 mA
T
J
=25 C,
I
R
= 0.1I
R
C
L
= 0
C
L
= 1
F
TANTALUM
C
L
= 1
F
TANTALUM
C
L
= 0
XC
L
XC
L
Advanced Monolithic Systems, Inc. 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)
0.047-0.055
(1.194-1.397)
0.015-0.017
(0.381-0.432)
0.110-0.120
(2.794-3.048)
0.083-0.098
(2.108-2.489)
0.035-0.040
(0.889-1.016)
0.070-0.080
(1.778-2.032)
0.018-0.024
(0.457-0.610)
10
NOM
0.0034-0.0050
(0.086-0.127)
(SOT-23 ) AMS DRW# 051991
0.035-0.041
(0.089-1.041)
0.0005-0.0040
(0.013-0.102)
0.018-0.024
(0.457-0.610)
10
NOM
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