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Advanced Monolithic Systems
FEATURES
* Trimmed 0.5% Tolerance * Wide Operating Current Range 60A to 100mA * Low Reference Input Current 0.4A * Low Dynamic Output Impedance * Low Output Noise * Nominal Temperature Range to 85C * Temperature-Compensated: 60ppm/C
AMS431L
1.2V SHUNT REGULATOR
RoHS compliant
APPLICATIONS
* Battery Powered Systems * Switching Power Supplies * Adjustable Power Supplies * Telecommunications * Error Amplifiers * Notebook/Personal Computer * Monitors/ VCR/ TV * Pagers
GENERAL DESCRIPTION
The AMS431L 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 1.24V (VREF) and 20V by adding two external resistors. The AMS431L features 0.5% initial tolerance, low dynamic output impedance and operates over a wide current range. 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, SOT-89, 3 pin SOT-23 and 5 pin SOT-23 packages.
ORDERING INFORMATION:
TOL. 0.5% 1.0% 2.0% TO-92 AMS431LAN AMS431LBN AMS431LCN PACKAGE TYPE SOT-89 AMS431LAL AMS431LBL AMS431LCL 3 LEAD SOT-23 AMS431LAM AMS431LBM AMS431LCM 5 LEAD SOT-23 AMS431LAM1 AMS431LBM1 AMS431LCM1 OPERATING TEMP. RANGE -40 to +85 C -40 to +85 C -40 to +85 C
PIN CONNECTIONS
TO-92 Plastic Package (N) SOT-89 (L) 3L SOT-23 (M) 5L SOT-23 (M1)
ANODE
1
2
3
N/C 1 N/C 2
5 ANODE
REF ANODE
CATHODE
1 REF
2
3
CATHODE 3
4 REFERENCE
ANODE CATHODE
REF
CATHODE
Bottom View
Top View
Top View
Top View
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS431L
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.) 20V 100mA 3mA -40C to +125C -65C to +150C 265C Internal Power Dissipation (PD) TO-92 Package SOT-89 Package SOT-23-3 Package SOT-23-5 Package Thermal Resistance (JA) TO-92 Package SOT-89 Package SOT-23-3 Package SOT-23-5 Package 0.78W 0.91W 0.28W 0.3 W 160C/W 110C/W 410C/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 noted. 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 VZ = VREF (circuit 1) TA = -40C to +85C IZ = 10mA V = from VREF R1 =10k, R2 = (test circuit 2) R1 =10k, R2 = TA = Full Range (test circuit 2) VZ = 6V, VREF = 0V ( test circuit 3) f < 1KHz, VZ = VREF IZ =100A to 100mA (test circuit 1) VZ = VREF (test circuit 1) 60 80 60 80 60 80 A 0.25 0.4 0.25 0.4 0.25 0.4 0.1 0.4 0.1 0.4 0.1 0.4 A 0.15 0.5 0.15 0.5 0.15 0.5 A
Conditions
Min
1.234
AMS431LA Typ Max
1.240 10 1.246 25
Min
1.228
AMS431LB Typ Max
1.240 10 1.252 25
Min
1.215
AMS431LC Typ Max
1.240 10 1.265 35
Units
V mV
-0.5
-2.7
-0.5
-2.7
-0.5
-2.7
mV/V
0.04
0.1
0.04
0.1
0.04
0.1
A
Minimum Operating Current
RECOMMENDED OPERATING CONDITIONS:
Min VREF 80A Max 20 V 100mA
Cathode Voltage, (VZ) Cathode Current, (IZ)
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS431L
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
VIN R1 VREF R2 GND
VOUT
1) Set the VOUT according to the following equation:
R1 VOUT = VREF1 + + IREFR1 R2 2) Choose the value of R as follows:
* * The maximum limit for R should be such that the cathode current, IZ is greater than the minimum operating current (80A) at VIN(min). The minimum limit for R should b such that IZ does not exceed 100mA under all load conditions, and the instantaneous turn-on value for IZ does not exceed 150mA. Both of the following conditions must be met:
Rmin
VIN(max) (to limit instantaneous turn - on IZ ) 150mA
Rmin
VIN(max) - VOUT (to limit IZ under normal operating conditions ) IOUT(min) + 100mA
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS431L
TYPICAL PERFORMANCE CHARACTERISTICS
Cathode Current vs. Cathode Voltage 300 CATHODE CURRENT (mA) CATHODE CURRENT (A) 200 100 0 -100 -200 -300 -1 -0.5 0.5 1 0 CATHODE VOLTAGE (V) Reference Input Current vs. Junction Temperature REFERENCE INPUT CURRENT (nA) 150
IZ= 10mA R1= 10k R2= TA =25 C VR= V REF
Cathode Current vs. Cathode Voltage 150 REFERENCE VOLTAGE (V) 100 50 0 -50 -100 -150 -1.5 -1 -0.5 0 0.5 1 CATHODE VOLTAGE (V)
T A =25 C VR= VREF
Reference Voltage vs. Junction Temperature 1.248 1.246 1.244 1.242 1.240 1.238 1.236 1.234 -50 -25 0 25 50 75 100 125 150 JUNCTION TEMPERATURE ( C) Off State Cathode Current vs. Junction Temperature 250
VREF= 0V IR= 60A IZ= 100mA
1.5
1.5
VREF/VZ(-mV/V)
125
100
75
50 -50 -25 0 25 50 75 100 125 150 JUNCTION TEMPERATURE ( C)
Ratio of Delta Reference Voltage to Delta Cathode Voltage vs. Junction Temperature 1.2 1.1 IZ= 10mA VZ= 16V to V REF 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 -50 -25 0 25 50 75 100 125 150 JUNCTION TEMPERATURE ( C)
CATHODE CURRENT(OFF STATE) (nA)
200 150 100 50 0
VR= 16V
VZ= 6V
-50 -25 0 25 50 75 100 125 150 JUNCTION TEMPERATURE ( C)
Reference Impedance vs. Junction Temperature REFERENCE IMPEDANCE () REFERENCE IMPEDANCE () 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 -50 -25 0 25 50 75 100 125 150 JUNCTION TEMPERATURE ( C)
IZ = 0.1 to 100mA VZ= V REF f< 1kHz
Reference Impedance vs. Frequency 100
TA =25 C
10
1
0.1
0.01 1 100 1000 10 FREQUENCY (kHz) 100000
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS431L
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Small Signal Gain and Phase Shift vs. Frequency 80 SMALL SIGNAL GAIN (dB) 70 60 50 40 30 20 10 0 -10 -20 100 1k 10k 100k FREQUENCY (Hz) 1000k -180 -225 -315 -360 PHASE SHIFT (deg) -270
10F
Small Signal Gain and Phase Shift Test Circuit
OUT IZ 15k 232
+ 8.25k GND
Stability Boundary Condition 3.5
T A =25 C
Stability Circuit
CATHODE CURRENT (mA)
3.0 2.5 2.0 1.5 1.0 0.5 0.0 0.001
VZ = 2V VZ = V REF Stable Stable + -
IZ R1 CL R2
0.01 1 0.1 LOAD CAPACITANCE (F)
10
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS431L
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
5 LEAD SOT-23 PLASTIC PACKAGE (M1)
0.110-0.120 (2.794-3.048)
0.102-0.118 (2.60-3.00) 0.059-0.070 (1.50-1.75)
0.037 (0.95) TYP 0.018-0.024 (0.457-0.610)
0.014-0.020 (0.350-0.50)
10 NOM
0.036-0.051 (0.090-1.30) 0.0035-0.0080 (0.090-0.20) 0.003 (0.150) MAX 0.075 (1.90) TYP 10 NOM 0.018-0.024 (0.457-0.610)
(SOT-23-5 ) AMS DRW# 051001
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS431L
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
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.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723

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