Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
Advanced
AMS431L
Monolithic
1.2V SHUNT REGULATOR
Systems
FEATURES
APPLICATIONS
Trimmed 0.5% Tolerance
Battery Powered Systems
Wide Operating Current Range 60
A to 100mA
Switching Power Supplies
Low Reference Input Current 0.4
A
Adjustable Power Supplies
Low Dynamic Output Impedance
Telecommunications
Low Output Noise
Error Amplifiers
Nominal Temperature Range to 85
C
Notebook/Personal Computer
Temperature-Compensated: 60ppm/
C
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 (V
REF
) 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.
PACKAGE TYPE
OPERATING
TO-92
SOT-89
3 LEAD SOT-23
5 LEAD SOT-23
TEMP. RANGE
0.5%
AMS431LAN
AMS431LAL
AMS431LAM
AMS431LAM1
-40 to +85
C
1.0%
AMS431LBN
AMS431LBL
AMS431LBM
AMS431LBM1
-40 to +85
C
2.0%
AMS431LCN
AMS431LCL
AMS431LCM
AMS431LCM1
-40 to +85
C
PIN CONNECTIONS
TO-92
SOT-89
3L SOT-23
5L SOT-23
Plastic Package (N)
(L)
(M)
(M1)
1
2
3
REF
ANODE
CATHODE
1
2
3
CATHODE
ANODE
REF
CATHODE
REF
ANODE
N/C
ANODE
CATHODE
REFERENCE
N/C
1
2
5
3
4
Bottom View
Top View
Top View
Top View
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431L
ABSOLUTE MAXIMUM RATINGS (Note 1)
Cathode Voltage (V
Z
)
20V
Internal Power Dissipation (P
D
)
Continuous Cathode Current (I
Z
)
100mA
TO-92 Package
0.78W
Reference Input Current (I
REF
)
3mA
SOT-89 Package
0.91W
Junction Temperature (T
J
)
-40
C to +125
C
SOT-23-3 Package
0.28W
SOT-23-5 Package
0.3 W
Storage temperature
-65
C to +150
C
Thermal Resistance (
JA
)
Lead Temperature (Soldering, 10sec.)
265
C
TO-92 Package
160
C/W
SOT-89 Package
110
C/W
SOT-23-3 Package
410
C/W
SOT-23-5 Package
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 I
Z
=10 mA and T
A
= +25C unless otherwise noted.
Parameter
Conditions
AMS431LA
Min Typ Max
AMS431LB
Min Typ Max
AMS431LC
Min Typ Max
Units
Reference Voltage
1.234
1.240
1.246
1.228
1.240
1.252
1.215
1.240
1.265
V
Deviation of Reference
Input Voltage over
Temperature
V
Z
= V
REF
(circuit 1)
T
A
= -40
C to +85
C
10
25
10
25
10
35
mV
Ratio of Change in
Reference Voltage to
Cathode Voltage
I
Z
= 10mA
V = from V
REF
-0.5
-2.7
-0.5
-2.7
-0.5
-2.7
mV/V
Reference Input Current
R1 =10k
, R2 =
(test circuit 2)
0.15
0.5
0.15
0.5
0.15
0.5
A
Reference Input Current
Deviation over
Temperature
R1 =10k
, R2 =
T
A
= Full Range
(test circuit 2)
0.1
0.4
0.1
0.4
0.1
0.4
A
Off State Cathode
Current
V
Z
= 6V, V
REF
= 0V
( test circuit 3)
0.04
0.1
0.04
0.1
0.04
0.1
A
Dynamic Output
Impedance
f < 1KHz, V
Z
= V
REF
I
Z
=100
A to 100mA
(test circuit 1)
0.25
0.4
0.25
0.4
0.25
0.4
Minimum Operating
Current
V
Z
= V
REF
(test circuit 1)
60
80
60
80
60
80
A
RECOMMENDED OPERATING CONDITIONS:
Min
Max
Cathode Voltage, (V
Z
)
V
REF
20 V
Cathode Current, (I
Z
)
80
A
100mA
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431L
TEST CIRCUITS
V
IN
I
REF
I
Z
V
Z
= V
REF
V
REF
V
IN
V
Z
I
Z
V
REF
I
REF
R1
R2
V
IN
V
Z
I
Z
OFF
Figure 1. Test Circuit for V
Z
=V
REF
Figure 2. Test Circuit for V
REF
vs I
Z
.
Test circuit for I
REF
.
Figure 3. Test Circuit for Off-State Current
TYPICAL APPLICATIONS
1) Set the V
OUT
according to the following equation:
2) Choose the value of R as follows:
The maximum limit for R should be such that the cathode current, I
Z
is greater than the minimum operating current (80
A) at V
IN(min)
.
The minimum limit for R should b such that I
Z
does not exceed 100mA under all load conditions, and the instantaneous turn-on value for I
Z
does not exceed
150mA. Both of the following conditions must be met:
R2
R1
V
IN
GND
V
REF
V
OUT
R1
I
R2
R1
1
V
V
REF
REF
OUT
+
+
=
(
)
Z
IN(max)
min
I
on
-
turn
ous
instantane
limit
to
150mA
V
R
(
)
conditions
operating
normal
under
I
limit
to
100mA
I
V
-
V
R
Z
OUT(min)
OUT
IN(max)
min
+
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431L
TYPICAL PERFORMANCE CHARACTERISTICS
0.01
1
10
100
10
100
1000
100000
Reference Impedance vs. Frequency
0.1
REFERENCE IMPEDANCE (
)
1
FREQUENCY (kHz)
-1
-0.5
0
0.5
1
-300
200
-100
Cathode Current vs. Cathode Voltage
1.5
CATHODE VOLTAGE (V)
CATHODE CURRENT (
A)
-200
300
0
T
A
=25 C
V
R
= V
REF
100
-1.5
-1
0
0.5
1
-150
100
-50
Cathode Current vs. Cathode Voltage
1.5
CATHODE VOLTAGE (V)
CATHODE CURRENT (
m
A)
-100
150
0
T
A
=25 C
V
R
= V
REF
50
-0.5
-50
25
50
75 100 125
1.248
1.242
150
REFERENCE VOLTAGE (V)
Reference Voltage vs.
Junction Temperature
JUNCTION TEMPERATURE ( C)
1.244
1.238
1.236
-25
0
I
Z
= 100mA
1.246
1.240
1.234
-50
25
50
75 100 125
150
100
150
Reference Input Current vs.
Junction Temperature
JUNCTION TEMPERATURE ( C)
125
75
-25
0
I
Z
= 10mA
50
-50
25
50
75 100 125
1.2
0.7
150
Ratio of Delta Reference Voltage to Delta
Cathode Voltage vs. Junction Temperature
JUNCTION TEMPERATURE ( C)
0.9
0.3
0.2
-25
0
I
Z
= 10mA
1.0
0.5
0.0
-50
25
50
75 100 125
250
150
150
Off State Cathode Current vs.
Junction Temperature
JUNCTION TEMPERATURE ( C)
50
-25
0
V
R
= 16V
200
100
0
REFERENCE INPUT CURRENT (
nA)
R
1
= 10k
R
2
=
1.1
0.8
0.6
0.4
0.1
V
REF
= 0V
V
Z
= 6V
CATHODE CURRENT(OFF STATE) (nA)
V
Z
= 16V to V
REF
V
REF
/
V
Z
(-
m
V/V)
-50
25
50
75 100 125
0.50
0.30
150
Reference Impedance vs.
Junction Temperature
JUNCTION TEMPERATURE ( C)
0.10
-25
0
I
Z
= 0.1 to 100mA
0.40
0.20
0
V
Z
= V
REF
REFERENCE IMPEDANCE (
)
f< 1kHz
0.45
0.35
0.25
0.15
0.05
I
R
= 60
A
T
A
=25 C
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431L
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
0.0
1.0
2.0
3.0
3.5
0.01
0.1
1
Stability Boundary Condition
2.5
CATHODE CURRENT (mA)
0.001
LOAD CAPACITANCE (
F)
1.5
0.5
10
R2
R1
I
Z
C
L
+
-
Stability Circuit
T
A
=25 C
V
Z
= V
REF
V
Z
= 2V
Stable
Stable
-20
10
40
70
80
1k
10k
100k
1000k
Small Signal Gain and Phase Shift
vs. Frequency
-10
50
SMALL SIGNAL GAIN (dB)
100
FREQUENCY (Hz)
20
60
30
0
-180
-225
-270
-315
-360
PHASE SHIFT (deg)
8.25k
15k
I
Z
10
F
+
-
Small Signal Gain and Phase Shift
Test Circuit
232
OUT
GND
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431L
PACKAGE DIMENSIONS
inches (millimeters) unless otherwise noted.
3L TO-92 PLASTIC PACKAGE (N)
5 LEAD SOT-23 PLASTIC PACKAGE (M1)
0.1400.010
(3.5560.127)
0.0600.010
(1.5240.254)
0.0150.002
(0.3810.051)
0.0160.003
(0.4060.076)
0.0500.005
(1.2700.127)
0.0600.005
(1.5240.127)
DIA
0.1800.005
(4.5720.127)
0.1800.005
(4.5720.127)
0.050
(1.270)
MAX
0.500
(12.70)
MIN
UNCONTROLLED
LEAD DIMENSIONS
10
NOM
5 NOM
N (TO-92 ) AMS DRW# 042391
0.90
(2.286)
NOM
0.059-0.070
(1.50-1.75)
0.014-0.020
(0.350-0.50)
0.110-0.120
(2.794-3.048)
0.102-0.118
(2.60-3.00)
0.037
(0.95)
TYP
0.075
(1.90)
TYP
0.018-0.024
(0.457-0.610)
10
NOM
0.0035-0.0080
(0.090-0.20)
(SOT-23-5 ) AMS DRW# 051001
0.036-0.051
(0.090-1.30)
0.003
(0.150)
MAX
0.018-0.024
(0.457-0.610)
10
NOM
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431L
PACKAGE DIMENSIONS
inches (millimeters) unless otherwise noted (Continued).
3 LEAD SOT-23 PLASTIC PACKAGE (M)
SOT-89 PLASTIC PACKAGE (L)
0.047-0.055
(1.194-1.397)
0.015-0.017
(0.381-0.432)
0.110-0.120
(2.794-3.048)
0.083-0.098
(2.108-2.489)
0.035-0.040
(0.889-1.016)
0.070-0.080
(1.778-2.032)
0.018-0.024
(0.457-0.610)
10
NOM
0.0034-0.0050
(0.086-0.127)
(SOT-23 ) AMS DRW# 051991
0.035-0.041
(0.089-1.041)
0.0005-0.0040
(0.013-0.102)
0.018-0.024
(0.457-0.610)
10
NOM
0.090-0.102
(2.29-2.60)
0.173-0.181
(4.40-4.60)
0.064-0.072
(1.62-1.83)
0.155-0.167
(3.94-4.25)
0.059
(1.50)
BSC
0.035-0.047
(0.89-1.20)
L (SOT-89 ) AMS DRW# 042392
0.118
(3.00)
BSC
0.014-0.019
(0.36-0.48)
0.017-0.022
(0.44-0.56)
0.084-0.090
(2.13-2.29)
0.055-0.063
(1.40-1.60)
0.014-0.017
(0.35-0.44)
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