ADMOS AMS431CL

Advanced
Monolithic
Systems
AMS431
PRECISION ADJUSTABLE SHUNT REGULATOR
FEATURES
APPLICATIONS
• Trimmed 0.25% Reference
• Wide Operating Current Range 250µ
µ A to 150mA
• Low Dynamic Output Impedance
• Low Output Noise
• Nominal Temperature Range to 85°°C
• Temperature-Compensated: 60ppm/°°C
• Internal Amplifier with 150mA Capability
• Battery Powered Systems
• Switching Power Supplies
• Adjustable Power Supplies
• Linear Regulators
• Error Amplifiers
• Notebook/Personal Computer
• Monitors/ VCR/ TV
• Pagers
GENERAL DESCRIPTION
The AMS431 is a three-terminal adjustable shunt regulator with guaranteed temperature stability over the entire range of
operation. The output voltage can be set to any value between 2.5V (VREF) and 36V by adding two external resistors. Due to
the sharp turn-on characteristics this device is an excellent replacement for zener diodes in many applications.
AMS431 is available in TO-92, SO-8, SOT-89 and SOT-23 packages.
ORDERING INFORMATION:
TOL.
PACKAGE TYPE
TO-92
AMS431AN
AMS431BN
AMS431CN
±0.25%
±0.5%
±1.0%
8 LEAD SOIC
AMS431AS
AMS431BS
AMS431CS
OPERATING
SOT-89
AMS431AL
AMS431BL
AMS431CL
3 LEAD SOT-23
AMS431AM
AMS431BM
AMS431CM
TEMP. RANGE
-40 to +85° C
-40 to +85° C
-40 to +85° C
PIN CONNECTIONS
TO-92
Plastic Package (N)
8L SOIC
SO Package (S)
SOT-89
(L)
3L SOT-23
(M)
ANODE
1
2
3
CATHODE
ANODE
1
8
REF
2
7
ANODE
ANODE
3
6
ANODE
4
5
N/C
CATHODE
REF
N/C
ANODE
Bottom View
Advanced Monolithic Systems, Inc.
1
REF
Top View
2
3
ANODE CATHODE
Top View
REF
CATHODE
Top View
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
ABSOLUTE MAXIMUM RATINGS (Note 1)
Cathode Voltage (VZ)
Continuous Cathode Current (IZ)
Reference Input Current (IREF)
Junction Temperature (TJ)
37V
-10mA to +150mA
10mA
-40°C to +125°C
Storage temperature
Lead Temperature (Soldering, 10sec.)
Internal Power Dissipation (PD)
TO-92 Package
SO-8 Package
SOT-89 Package
SOT-23 Package
Thermal Resistance (ϕJA)
TO-92 Package
SO-8 Package
SOT-89 Package
SOT-23 Package
-65°C to +150°C
265°C
0.78W
0.71W
0.91W
0.28W
160°C/W
175°C/W
110°C/W
410°C/W
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.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IZ =10 mA and TA = +25°C unless otherwise specified.
Parameter
Conditions
Min
Reference Voltage
2.489
AMS431A
Typ
Max
2.495
2.501
8.0
8.0
Min
2.483
AMS431B
Typ
Max
2.495
2.507
15
8.0
15
8.0
Min
2.470
AMS431C
Typ
Max
Units
2.495
2.520
V
15
8.0
15
mV
15
8.0
15
mV
Deviation of Reference
Input Voltage over
Temperature
VZ = VREF (circuit 1)
TA = +25°C to +85°C
TA = -40°C to +25°C
Ratio of Change in
Reference Voltage to
Cathode Voltage
VZ from VREF to 10V
-0.5
-2.7
-0.5
-2.7
-0.5
-2.7
mV/V
VZ from VREF to 36V
-1.0
-2.0
-1.0
-2.0
-1.0
-2.0
mV/V
Reference Input Current
R1 =10kΩ, R2 = ∞Ω
(test circuit 2)
0.5
4.0
0.5
4.0
0.5
4.0
µA
Reference Input Current
Deviation over
Temperature
R1 =10kΩ, R2 = ∞Ω
TA = Full Range
(test circuit 2)
0.4
1.2
0.4
1.2
0.4
1.2
µA
Off State Cathode
Current
VZ = 36V, VREF = 0V
( test circuit 3)
0.04
0.5
0.04
0.5
0.04
0.5
µA
f < 1KHz, VZ = VREF
0.25
0.5
0.25
0.5
0.25
0.5
Ω
100
250
100
250
100
250
µA
Dynamic Output
Impedance
Minimum Operating
Current
IZ =100µA to 100mA
(test circuit 1)
VZ = VREF
(test circuit 1)
RECOMMENDED OPERATING CONDITIONS:
Cathode Voltage, (VZ)
Cathode Current, (IZ)
Min
VREF
0.25mA
Advanced Monolithic Systems, Inc.
Max
36 V
120mA
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
TEST CIRCUITS
VZ = VREF
VIN
VZ
VIN
IREF
R1
IZ
VZ
VIN
IZ OFF
IREF
IZ
VREF
R2
Figure 1. Test Circuit for VZ=VREF
VREF
Figure 2. Test Circuit for VREF vs IZ.
Test circuit for IREF.
Figure 3. Test Circuit for Off-State Current
TYPICAL APPLICATIONS
Single Supply Comparator with
Temperature Compensated Threshold
Shunt Regulator
VO
V+
V+
R1
VREF
OUT
R2
VON ≈ 2V
VOFF = V+
IN
VTH ≈ 2.5V
VO ≈ (1+R1/R2)VREF
GND
Series Regulator
Higher Current Shunt Regulator
V+
V+
30Ω
VO
R1
0.01µF
R1
R1
VO
R2
VO ≈ (1+R1/R2)VREF
Advanced Monolithic Systems, Inc.
VO ≈ (1+R1/R2)VREF
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
TYPICAL APPLICATIONS (Continued)
Over Voltage/Under Voltage
Protection Circuit
Voltage Monitor
V+
V+
OUT ON
WHEN
LOW < V+ < HIGH
LIMIT
LIMIT
R1B
R1B
R1A
R1A
R2A
R2B
R2A
R2B
LOW LIMIT ≈ VREF( 1+R1B/R2B)+VBE
LOW LIMIT ≈ VREF( 1+R1A/R2A)
LOW LIMIT ≈ VREF( 1+R1B/R2B)+VBE
LOW LIMIT ≈ VREF( 1+R1A/R2A)
Delay Timer
LED ON WHEN
LOW LIMIT < V+ < HIGH LIMIT
Current Limiter or Current Source
V+
IO
V+
RCL
R
OFF
ON
C
IO =VREF/RCL
DELAY = R*C*ln*V+/(V+)-VREF
Constant Current Sink
V+
IO
RS
IO = VREF/RS
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
TYPICAL PERFORMANCE CHARACTERISTICS
Input Current vs V
500
I Z MIN
400
300
200
100
0
1.0
2.0
CATHODE VOLTAGE (V)
3.0
INPUTT CURRENT (mA)
REFERENCE VOLTAGE (V)
INPUTT CURRENT (µA)
150
1000
ΤΑ = 25°C
VZ = V REF
0
Input Current vs V Z
Thermal Information
Z
SOT-89
500
TO-92
SO-8
SOT-23
100
ΤΑ = 25°C
VZ = V REF
100
50
0
25
70 85
125
TEMPERATURE (° C)
0
1.0
2.0
CATHODE VOLTAGE (V)
3.0
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
3L TO-92 PLASTIC PACKAGE (N)
0.060±0.005
(1.524±0.127)
DIA
0.180±0.005
(4.572±0.127)
0.180±0.005
(4.572±0.127)
0.060±0.010
(1.524±0.254)
0.90
(2.286)
NOM
0.140±0.010
(3.556±0.127)
5° NOM
0.500
(12.70)
MIN
0.050±0.005
(1.270±0.127)
Advanced Monolithic Systems, Inc.
0.050
(1.270)
MAX
10°
NOM
UNCONTROLLED
LEAD DIMENSIONS
0.016±0.003
(0.406±0.076)
0.015±0.002
(0.381±0.051)
N (TO-92 ) AMS DRW# 042391
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued).
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
0.010-0.020
x 45°
(0.254-0.508)
0.053-0.069
(1.346-1.752)
0.004-0.010
(0.101-0.254)
0.014-0.019
(0.355-0.483)
0.008-0.010
(0.203-0.254)
0.050
(1.270)
TYP
0°-8° 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
SOT-89 PLASTIC PACKAGE (L)
0.173-0.181
(4.40-4.60)
0.055-0.063
(1.40-1.60)
0.014-0.017
(0.35-0.44)
0.064-0.072
(1.62-1.83)
0.155-0.167
(3.94-4.25)
0.084-0.090
(2.13-2.29)
0.090-0.102
(2.29-2.60)
0.035-0.047
(0.89-1.20)
0.059
(1.50)
BSC
0.014-0.019
(0.36-0.48)
0.017-0.022
(0.44-0.56)
L (SOT-89 ) AMS DRW# 042392
0.118
(3.00)
BSC
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued).
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