ADMOS AMS3431 Precision adjustable shunt regulator Datasheet

Advanced
Monolithic
Systems
AMS3431
PRECISION ADJUSTABLE SHUNT REGULATOR
RoHS compliant
FEATURES
APPLICATIONS
• Trimmed 0.25% Reference
• Wide Operating Current Range 250µA 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 AMS3431 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.
AMS3431 is available in the space saving SOT-23 package and in the TO-92 package.
ORDERING INFORMATION:
TOL.
±0.25%
±0.5%
±1.0%
PACKAGE TYPE
TO-92
AMS3431AN
AMS3431BN
AMS3431CN
3 LEAD SOT-23
AMS3431AM
AMS3431BM
AMS3431CM
OPERATING
TEMPERATURE RANGE
-40 to +85° C
-40 to +85° C
-40 to +85° C
PIN CONNECTIONS
TO-92
Plastic Package (N)
3L SOT-23
(M)
ANODE
1
2
CATHODE
ANODE
3
REF
Bottom View
Advanced Monolithic Systems, Inc.
CATHODE
REF
Top View
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS3431
ABSOLUTE MAXIMUM RATINGS (Note 1)
Cathode Voltage (VZ)
Continuous Cathode Current (IZ)
Reference Input Current (IREF)
Junction Temperature (TJ)
Storage Temperature
Lead Temperature (Soldering, 25sec.)
37V
-10mA to +150mA
10mA
-40°C to +125°C
-65°C to +150°C
265°C
Internal Power Dissipation (PD)
TO-92 Package
SOT-23 Package
Thermal Resistance (ϕJA)
TO-92 Package
SOT-23 Package
0.78W
0.28W
160°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
AMS3431A
Typ
Max
2.495
2.501
8.0
8.0
Min
2.483
AMS3431B
Typ
Max
2.495
2.507
15
8.0
15
8.0
Min
2.470
AMS3431C
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
R1 =10kΩ, R2 = ∞Ω
0.5
4.0
0.5
4.0
0.5
4.0
µA
0.4
1.2
0.4
1.2
0.4
1.2
µA
0.04
0.5
0.04
0.5
0.04
0.5
µA
0.25
0.5
0.25
0.5
0.25
0.5
Ω
100
250
100
250
100
250
µA
Reference Input
Current
Reference Input
Current Deviation over
Temperature
(test circuit 2)
R1 =10kΩ, R2 = ∞Ω
TA = Full Range
(test circuit 2)
Off State Cathode
Current
VZ = 36V, VREF =
0V
Dynamic Output
Impedance
f < 1KHz, VZ = VREF
( test circuit 3)
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
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS3431
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+
VO
30Ω
R1
0.01µF
R1
R1
VO
R2
VO ≈ (1+R1/R2)VREF
Advanced Monolithic Systems, Inc.
VO ≈ (1+R1/R2)VREF
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS3431
TYPICAL APPLICATIONS (Continued)
Over Voltage/Under Voltage
Protection Circuit
Voltage Monitor
V+
V+
OUT ON
WHEN
LOW < V+ < HIGH
LIMIT
LIMIT
R1B
R1A
R1B
R1A
R2A
R2B
R2A
R2B
LOW LIMIT ≈ VREF( 1+R1B/R2B)+VBE
LOW LIMIT ≈ VREF( 1+R1A/R2A)
LIMIT
LOW LIMIT ≈ VREF( 1+R1B/R2B)+VBE
LOW LIMIT ≈ VREF( 1+R1A/R2A)
Delay Timer
LED ON WHEN
LOW LIMIT < V+ < HIGH
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.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS3431
TYPICAL PERFORMANCE CHARACTERISTICS
Input Current vs VZ
150
500
IZ MIN
400
300
200
100
0
1.0
2.0
CATHODE VOLTAGE (V)
3.0
500
INPUTT CURRENT ( mA)
REFERENCE VOLTAGE (V)
INPUTT CURRENT ( µA)
Τ Α = 25°C
VZ = VREF
0
Input Current vs VZ
Thermal Information
1000
TO-92
SOT-23
100
ΤΑ = 25°C
VZ = VREF
100
50
0
25
70 85
TEMPERATURE (° C)
125
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)
www.advanced-monolithic.com
N (TO-92 ) AMS DRW# 042391
Phone (925) 443-0722
Fax (925) 443-0723
AMS3431
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.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
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