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Advanced Monolithic Systems
FEATURES
AMS285/AMS385
ADJUSTABLE MICROPOWER VOLTAGE REFERENCE DIODE
APPLICATIONS
* Battery Powered Systems * Instrumentation * A/D, D/A Converters * Temperature measurement * Current sources * Notebook/Personal Computer * Monitors/ VCR/ TV * Pagers
* Adjustable from 1.24V to 5.30V * Operating Current 10A to 20mA * 1% and 2% Initial Tolerance * 1 Dynamic Impedance * Low Temperature Coefficient * 1.2V Device and 2.5V Device also available AMS285-1.2 and AMS285-2.5 series, respectively AMS385-1.2 and AMS385-2.5 series.
GENERAL DESCRIPTION
The AMS285/AMS385 are three-terminal micropower band-gap voltage reference diodes. They feature a very low dynamic impedance and good temperature coefficient, operating from 1.24V to 5.3V and over a 10A to 20mA current range. On-chip trimming is used to provide tight voltage tolerance. Since the AMS285/AMS385 is a band-gap reference, uses only transistors and resistors, low noise and good long-term stability result. Careful design of the AMS285/AMS385 has made the device exceptionally tolerant of capacitive loading, making it easy to use in almost any reference application. The wide dynamic operating range allows its use with widely varying supplies with excellent regulation. The extremely low power drain of the AMS285/AMS385 makes these reference diodes useful for micropower circuitry. These voltage references can be used to make portable meters, regulators or general purpose analog circuitry with battery life approaching shelf life. Further more, the wide operating current allows it to replace older references with a tight tolerance part. The AMS285 is operational in the full industrial temperature range of -40C to 85C while AMS385 is operating over a 0C to 70C temperature range. The AMS285/AMS385 are available in TO-92, SO-8 and SOT-89 packages.
ORDERING INFORMATION:
TOL. 12mV 25mV 25mV 12mV 25mV 25mV TO-92 AMS285AN AMS285BN AMS285CN AMS385AN AMS385BN AMS385CN PACKAGE TYPE 8 LEAD SOIC AMS285AS AMS285BS AMS285CS AMS385AS AMS385BS AMS385CS SOT-89 AMS285AL AMS285BL AMS285CL AMS385AL AMS385BL AMS385CL OPERATING TEMPERATURE RANGE -40 to 85 C -40 to 85 C -40 to 85 C 0 to 70 C 0 to 70 C 0 to 70 C
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS285/AMS385
ABSOLUTE MAXIMUM RATINGS
Reverse Current Forward Current Operating Temperature Range AMS285 AMS385 30mA 10mA -40C to 85C 0C to 70C Storage temperature Soldering information TO-92 package: 10 sec. SOIC package: Vapor phase (60 sec) Infrared (15 sec.) SOT-89 package: 10 sec. -55C to +150C 260C 215C 220C 265C
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR = 100 A, and TA = +25C unless otherwise specified. Parameter
Reference Voltage Dynamic Output Impedance
Conditions
IR =100 A IAC =0.1IR, f = 20Hz VOUT = VREF VOUT = 5.3V 10A IR 1mA 1mA IR 20mA VOUT = VREF VOUT = 5.3V 10Hz f 10kHz VOUT = VREF VOUT = 5.3V
Min
1.228
AMS285A Typ Max
1.240 0.3 0.7 0.2 4 6 30 1.0 10 9 45 1.252
Min
1.215
AMS285B Typ
1.240 0.3 0.7 0.2 4 6 30
Max
1.265
Min
1.215
AMS285C Typ Max
1.240 0.3 0.7 1.265
Units
V
Reference Voltage Change with Current Min. Operating Current (Note 4) Wide Band Noise (Note 5)
1.0 10 9 45
0.2 4 6 30
1.0 10 9 45
mV mV A A Vrms Vrms
50 170 25
50 170 50
50 170 100 150
Temperature Coeff. (Note 6) Long Term Stability (Note 5) TA=25C.1C T = 1000 Hr 20
ppm/C
20
20
ppm
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR = 100 A, and TA = +25C unless otherwise specified. Parameter
Reference Voltage Dynamic Output Impedance
Conditions
IR =100 A IAC =0.1IR, f = 20Hz VOUT = VREF VOUT = 5.3V 10A IR 1mA 1mA IR 20mA VOUT = VREF VOUT = 5.3V 10Hz f 10kHz VOUT = VREF VOUT = 5.3V
Min
1.228
AMS285A Typ Max
1.240 0.3 0.7 0.2 4 6 30 1.0 10 9 45 1.252
Min
1.215
AMS285B Typ
1.240 0.3 0.7 0.2 4 6 30
Max
1.265
Min
1.215
AMS285C Typ Max
1.240 0.3 0.7 1.265
Units
V
Reference Voltage Change with Current Min. Operating Current (Note 4) Wide Band Noise (Note 5)
1.0 10 9 45
0.2 4 6 30
1.0 10 9 45
mV mV A A
50 170 25
50 170 50
50 170 100 150
Vrms Vrms ppm/C
Temperature Coeff. (Note 6) Long Term Stability (Note 5) TA=25C.1C T = 1000 Hr 20
20
20
ppm
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS285/AMS385
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Note 2: For elevated temperature operation, Tj max is:
AMS285 AMS385 +125C +100C
Thermal Resistance
JA (junction to ambient)
TO-92
170C/W (0.125" leads)
SO-8
165C/W
SOT-89
160C/W
Note 3: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at TA = TJ = 25C. Note 4: Guaranteed and 100% production tested. Note 5: Guaranteed but not 100% production tested. These limits are not used to calculate average outgoing quality levels. Note 6: The average temperature coefficient is defined as the maximum deviation of reference voltage at all measured temperatures between the operating TMAX
and TMIN, divided by TMAX - TMIN. The measured temperatures are 0C, 25C, 70C and 85C.
PIN CONNECTIONS
TO-92 Plastic Package (N) 8L SOIC SO Package (S)
+ 8 N/C N/C ADJ 7 6 5
SOT-89 (L)
FB 3
+ 2
1
3 1 2 3 N/C N/C N/C 4 FB
2 +
1 -
Bottom View
Top View
Top View
TYPICAL APPLICATIONS
1.2V Reference
9V R1 500k 1.2V + AMS385 FB AMS385 FB AMS385 R3 364k +
5.0V Reference
9V R1 50k
Precision 10V Reference
15V R1 5k VOUT 10V + FB R3 68.1k 1% R2 301k 1%
R3 VOUT = 1.24 R2 + 1 5V R2 120k
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS285/AMS385
TYPICAL APPLICATIONS (Continued)
Low AC Noise Reference
15V R1 100k VOUT 10V + AMS385 C1 0.47F FB + C2 10F R2 120k
Current Source
+15V
+ AMS385 FB
R1
2N2905 2N3964 R2 120k
R4 33
R3 360k
1 A< I < 100 mA 1.24V IOUT = R1
25V Low Current Shunt Regulator
V+ R3
200mA Shunt Regulator
V+ R4 50 A< I < 200 mA VOUT 2.5V
100 A< I < 5 mA VOUT 25V R1 + 120k FB R2 2.4M
+ AMS385 2N2219 R3 1k FB
R1 120k
AMS385 2N5115
R2 120k
Voltage Level Detector
Voltage Level Detector
+ AMS385 D1 FB
R1 120k D1 R2 1M
+ AMS385 FB
R1 120k
R3 200 -5V
R2 1M R3 330
< -12V LED ON -5V
> -12V LED ON
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS285/AMS385
TYPICAL APPLICATIONS (Continued)
Bidirectional Clamp 2.4V
VIN I R1 VOUT D2 1N457 I
Bidirectional Adjustable Clamp 1.8V to 2.4V
VIN R1 VOUT D2 1N457
Bidirectional Adjustable Clamp 2.4V to 6V
VIN I R1 VOUT + AMS385 R2 330k FB R3 1M FB R4 330k D2 1N457 AMS385 +
+ AMS385 D1 1N457 FB
R2 510k FB R3 510k
-
R2 510k FB + AMS385 D1 1N457 R3 510k FB R4 390k
-
AMS385 +
AMS385 +
D1 1N457
TYPICAL PERFORMANCE CHARACTERISTICS
REFERENCE VOLTAGE CHANGE (mV)
0 Y T -5
REFERENCE VOLTAGE CHANGE (mV)
AMS285 Typical Temperature Coefficient
AMS385 Typical Temperature Coefficient
0 Y T -5 TEMPCO =
Y T
-10 -50 -40 -25 0 25 50 75 80 100 125 TEMPERATURE ( C)
-10
0 25 70 TEMPERATURE ( C)
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS285/AMS385
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Reverse Characteristics OUTPUT VOLTAGE CHANGE (mV) 10 8 6 4 2 0 -2 0.01 0.1 1 10 REVERSE CURRENT (mA) 100
TA =25 C TA =-55 C
Reverse Characteristics 100 REVERSE CURRENT (A) FORWARD VOLTAGE (V) 1.2
Forward Characteristics
TA =125 C
TA =-55 C
10
TA =125 C
0.8
1
TA =-55 C
0.4
TA =25 C TA =125 C
0.1 0
TA =25 C
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 REVERSE VOLTAGE (V) Feedback Current 0.01 0.1 1 10
Temperature Drift of 3 Representative Units 1.260 FEEDBACK CURRENT (nA) REFERENCE VOLTAGE (V)
IR= 100A
Minimum Operating Current 80
25
IR= 100A
1.250
20 15 10
MINIMUM CURRENT (A)
70 60 50 40 30 20
TYP @ 25 C AMS385 WORST CASE
1.240
VOUT = VREF
VOUT = 5.3V
1.230
5 0 -50 -25 0 25 50 75 100 125 TEMPERATURE ( C) Output Noise Voltage
1.220 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE ( C) Dynamic Output Impedance 100
10 0 1 5 2 3 4 OUTPUT VOLTAGE (V) Response Time 6 5
10,000
IR= 100A IR= 0.1IR TA =25 C VOUT = VREF IR= 100A VOUT = 5.3V
OUTPUT IMPEDANCE ()
OUTPUT INPUT 50k OUTPUT 120k AMS385 364k
NOISE (nV/Hz)
4 1,000
VOUT = VREF
10
VOUT = 5.3V
VOLTAGE (V)
3 2 1 0 10
1
100
INPUT
0.1 10 100 1k 10k FREQUENCY (Hz) 100k
10 10 100 1k 10k FREQUENCY (Hz) 100k
0 0 50 100 150 200 TIME (s)
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS285/AMS385
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
3 LEAD TO-92 PLASTIC PACKAGE (N)
0.0600.005 (1.5240.127) DIA
0.1800.005 (4.5720.127) 0.0600.010 (1.5240.254) 0.1400.010 (3.5560.127)
0.1800.005 (4.5720.127)
0.90 (2.286) NOM
5 NOM 0.500 (12.70) MIN
10 NOM
0.050 (1.270) MAX
UNCONTROLLED LEAD DIMENSIONS
0.0500.005 (1.2700.127)
0.0160.003 (0.4060.076)
0.0150.002 (0.3810.051)
N (TO-92 ) AMS DRW# 042391
8 LEAD SOIC PLASTIC PACKAGE (S)
0.189-0.197* (4.801-5.004) 8 7 6 5
0.228-0.244 (5.791-6.197)
0.150-0.157** (3.810-3.988)
1
2
3
4
0.053-0.069 (1.346-1.752) 0.004-0.010 (0.101-0.254) 0.008-0.010 (0.203-0.254)
0.010-0.020 x 45 (0.254-0.508) 0-8 TYP
0.014-0.019 (0.355-0.483)
0.050 (1.270) TYP
0.016-0.050 (0.406-1.270)
S (SO-8 ) AMS DRW# 042293
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS285/AMS385
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued).
SOT-89 PLASTIC PACKAGE (L)
0.173-0.181 (4.40-4.60) 0.064-0.072 (1.62-1.83)
0.055-0.063 (1.40-1.60) 0.014-0.017 (0.35-0.44)
0.155-0.167 (3.94-4.25) 0.090-0.102 (2.29-2.60) 0.084-0.090 (2.13-2.29)
0.035-0.047 (0.89-1.20) 0.059 (1.50) BSC 0.118 (3.00) BSC 0.014-0.019 (0.36-0.48) 0.017-0.022 (0.44-0.56)
L (SOT-89 ) AMS DRW# 042392
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

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