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Advanced Monolithic Systems
FEATURES
* Trimmed 0.25% Reference * Wide Operating Current Range 250A to 150mA * Low Dynamic Output Impedance * Low Output Noise * Nominal Temperature Range to 85C * Temperature-Compensated: 60ppm/C * Internal Amplifier with 150mA Capability
AMS3431
PRECISION ADJUSTABLE SHUNT REGULATOR
APPLICATIONS
* 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 3
CATHODE ANODE
REF
CATHODE
REF
Bottom View
Top View
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
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, 10sec.) 37V -10mA to +150mA 10mA -40C to +125C -65C to +150C 265C Internal Power Dissipation (PD) TO-92 Package SOT-23 Package Thermal Resistance (JA) TO-92 Package SOT-23 Package 0.78W 0.28W 160C/W 410C/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 = +25C unless otherwise specified. Parameter
Reference Voltage Deviation of Reference Input Voltage over Temperature Ratio of Change in Reference Voltage to Cathode Voltage Reference Input Current Reference Input Current Deviation over Temperature Off State Cathode Current Dynamic Output Impedance Minimum Operating Current VZ = VREF (circuit 1) TA = +25C to +85C TA = -40C to +25C VZ from VREF to 10V VZ from VREF to 36V R1 =10k, R2 = (test circuit 2) R1 =10k, R2 = TA = Full Range (test circuit 2) VZ = 36V, VREF = 0V ( test circuit 3) f < 1KHz, VZ = VREF IZ =100A to 100mA (test circuit 1) VZ = VREF (test circuit 1) 100 250 100 250 100 250 A
Conditions
Min
2.489
AMS3431A Typ Max
2.495 8.0 8.0 -0.5 -1.0 0.5 2.501 15 15 -2.7 -2.0 4.0
Min
2.483
AMS3431B Typ Max
2.495 8.0 8.0 -0.5 -1.0 0.5 2.507 15 15 -2.7 -2.0 4.0
Min
2.470
AMS3431C Typ Max
2.495 8.0 8.0 -0.5 -1.0 0.5 2.520 15 15 -2.7 -2.0 4.0
Units
V mV mV mV/V mV/V A
0.4
1.2
0.4
1.2
0.4
1.2
A A
0.04 0.25
0.5 0.5
0.04 0.25
0.5 0.5
0.04 0.25
0.5 0.5
RECOMMENDED OPERATING CONDITIONS:
Min VREF 0.25mA Max 36 V 120mA
Cathode Voltage, (VZ) Cathode Current, (IZ)
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS3431
TEST CIRCUITS
VIN
VZ = VREF
VIN
VZ
VIN
VZ
IREF IZ VREF
R1
IREF IZ
IZ OFF
R2
VREF
Figure 1. Test Circuit for VZ=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
VO R1 VREF R2 IN VTH 2.5V V+
Shunt Regulator
V+
OUT VON 2V VOFF = V+
VO (1+R1/R2)VREF
GND
Series Regulator
V+ V+
Higher Current Shunt Regulator
VO
30
R1
0.01F R1 VO R2 R1
VO (1+R1/R2)VREF
VO (1+R1/R2)VREF
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS3431
TYPICAL APPLICATIONS (Continued)
Over Voltage/Under Voltage Protection Circuit
V+ R1B OUT ON WHEN LOW < V+ < HIGH LIMIT LIMIT
Voltage Monitor
V+ 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)
LED ON WHEN LOW LIMIT < V+ < HIGH LIMIT
Delay Timer
V+
Current Limiter or Current Source
IO V+ RCL
R
OFF
ON
C
DELAY = R*C*ln*V+/(V+)-VREF
IO =VREF/RCL
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
AMS3431
TYPICAL PERFORMANCE CHARACTERISTICS
Input Current vs V
= 25C VZ = V REF
Z
Thermal Information 1000 REFERENCE VOLTAGE (V) INPUTT CURRENT (mA) 150
Input Current vs V Z
= 25C VZ = V REF
INPUTT CURRENT (A)
500 400 300 200 100 0 0 1.0 2.0 CATHODE VOLTAGE (V) 3.0
I Z MIN
100
500
TO-92
50
SOT-23
100
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)
0.0600.005 (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
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
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.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

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