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AME, Inc.
AME431B
Adjustable Precision Shunt Regulator
n General Description
The AME431B series ICs are 3-terminal adjustable shunt regulator with guaranteed temperature stability over a full operation range. These ICs feature sharp turn-on characteristics, low temperature coefficient and low output impendance, which make them ideal substitutes for Zener diodes in applications such as switching power supply, charger and other adjustable regulators. The reference is set to 1.24V for AME431Bxxxxx12 and 2.5V for AME431Bxxxxx25. The output voltage can be set to 1.24V to 16V for VREF=1.24V part type and 2.5 to 36V for VREF=2.5V part type with two external resistors. The AME431B precision reference is offered in two reference tolerance: 0.5% and 1.0% The 5 main packages have low thermal impendance which allows operation over a wide range of -40oC t o +125oC.
n Functional Block Diagram
V+ (Cathode)
REF
VREF
GND (Anode)
n Features
l Very accurate reference voltage : 0.15% typical l High stability under capacitive load l Low temperature deviation: 4.5mV typical l Low equivalent full-range temperature coefficient with 20PPM/oC typical l Low dynamic output resistance: 0.2 typical l Sink current capacity from 1mA to 100mA l Low output noise l Available in 5 packages: TO-92, SOT-23-3, SOT-89, SO-8 and SOT-25
n Applications
l Adjustable power supplies l Linear regulators l Battery operated computer l Portable electronics l l l l l Instrumentation Switching power supply Mother board LCD monitor Note book computer
1
AME, Inc.
AME431B
Adjustable Precision Shunt Regulator
n Typical Applications
Shunt Regulator
R3 VIN VOUT
R1 VREF VO=(1+R1/R2) VREF AME431B
R2
High Current Shunt Regulator
R1 VOUT R4 R2 VO =(1+R2/R3) VREF VREF AME431B R3
VIN
Current Source or Current Limit
VIN R2 IOUT
R1
IOUT =VREF/R2+IKA
AME431B
2
AME, Inc.
AME431B
Adjustable Precision Shunt Regulator
n Typical Applications (contd.)
Precision 5V 1.5A Regulator
VIN R1 8.2K AME1117 Adjust R2 250
VOUT 5V, 1.5A
AME431B R3 250
Precision 5V 1.5A Regulator
R3 C1 R2 680 R5 R1
COMP
R4 VOUT
U2 3 4
C2 Q1 2 AME431B R6
PWM Controller
VFB
PS521
3
AME, Inc.
AME431B
Adjustable Precision Shunt Regulator
n Pin Configuration
SOT-23 Top View
3
SOT-23 Top View AME431BAJETXXXX 1. Cathode 2. REF 3. Anode
3
AME431B
AME431B
AME431BBJETXXXX 1. REF 2. Cathode 3. Anode
1
2
1
2
SOT-89 Front View AME431BAJFTXXXX 1. REF 2. Anode 3. Cathode
TO-92-3 Bottom View
1 2 3
AME431B
AME431BAJATXXXX 1. REF 2. Anode 3. Cathode
1
2
3
SO-8 Top View
8 7 6 5
SOT-25 Top View AME431BAJHAXXXX 1. Cathode 2. Anode 3. Anode 4. NC 5. NC 6. Anode 7. Anode 8. REF
5 4
AME431B
AME431B
1 2 3
AME431BAJEVXXXX 1. NC 2. NC 3. Cathode 4. REF 5. Andode
1
2
3
4
4
AME, Inc.
AME431B
Adjustable Precision Shunt Regulator
n Ordering Information 431B x x x x x x x
Special Feature Reference Voltage Accuracy Number of Pins Package Type Operating Temperature Range Pin Configuration
Operating Temperature Range J: -40OC to 125OC Number Accuracy of Pins A: 8 T: 3 V: 5 A: 0.5% B: 1.0%
Pin Configuration A
(SOT-23)
Package Type
Reference Voltage 12: 1.24V 25: 2.5V
Special Feature
1. Cathode 2. REF 3. Anode 1. REF 2. Cathode 3. Anode 1. REF 2. Anode 3. Cathode 1. REF 2. Anode 3. Cathode 1. Cathode 2. Anode 3. Anode 4. NC 5. NC 6. Anode 7. Anode 8. REF 1. NC 2. NC 3. Cathode 4. REF 5. Anode
A: E: F: H:
TO-92 SOT-2X SOT-89 SO-8
L: Low profile Y: Lead free & Low profile Z: Lead free
B
(SOT-23)
A
(SOT-89)
A
(TO-92-3)
A
(SO-8)
A
(SOT-25)
5
AME, Inc.
AME431B
Adjustable Precision Shunt Regulator
n Ordering Information (contd.)
Part Number
AME431BAJETA12 AME431BAJETA12L AME431BAJETA12Y AME431BAJETA12Z AME431BAJETB12 AME431BAJETB12L AME431BAJETB12Y AME431BAJETB12Z AME431BBJETA12 AME431BBJETA12L AME431BBJETA12Y AME431BBJETA12Z AME431BBJETB12 AME431BBJETB12L AME431BBJETB12Y AME431BBJETB12Z
Marking*
AZNww AZNww AZNww AZNww AZOww AZOww AZOww AZOww AZPww AZPww AZPww AZPww AZQww AZQww AZQww AZQww
Reference Voltage Accuracy Package
1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 0.5% 0.5% 0.5% 0.5% 1.0% 1.0% 1.0% 1.0% 0.5% 0.5% 0.5% 0.5% 1.0% 1.0% 1.0% 1.0% SOT-23 SOT-23 SOT-23 SOT-23 SOT-23 SOT-23 SOT-23 SOT-23 SOT-23 SOT-23 SOT-23 SOT-23 SOT-23 SOT-23 SOT-23 SOT-23
Temp. Range
- 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC
* Package Options Part Number
AME431BXEAX AME431BXEAX-1
Package
TO-92 Taping TO-92 Bulk
Lead Pitch
5.04mm 2.54mm
Note: yyww & ww represents the date code * A line on top of the first letter represents lead free plating such as AZN Please consult AME sales office or authorized Rep./Distributor for output voltage and package type availability.
6
AME, Inc.
AME431B
Adjustable Precision Shunt Regulator
n Ordering Information (contd.)
Part Number
AME431BAJATA12
Marking*
AME12 431B AJATA yyww AME12 431B AJATA yyww AME12 431B AJATB yyww AME12 431B AJATB yyww BAFww BAFww BAFww BAFww BAGww BAGww BAGww BAGww AZAww AZAww AZAww AZAww AZBww AZBww AZBww AZBww
Reference Voltage Accuracy Package
1.24V 0.5% TO92-3
Temp. Range
- 40oC to + 125oC
AME431BAJATA12Z
1.24V
0.5%
TO92-3
- 40oC to + 125oC
AME431BAJATB12
1.24V
1.0%
TO92-3
- 40oC to + 125oC
AME431BAJATB12Z
1.24V
1.0%
TO92-3
- 40oC to + 125oC
AME431BAJETA25 AME431BAJETA25L AME431BAJETA25Z AME431BAJETA25Y AME431BBJETA25 AME431BBJETA25L AME431BBJETA25Z AME431BBJETA25Y AME431BAJETB25 AME431BAJETB25L AME431BAJETB25Z AME431BAJETB25Y AME431BBJETB25 AME431BBJETB25L AME431BBJETB25Z AME431BBJETB25Y
2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V
0.5% 0.5% 0.5% 0.5% 0.5% 0.5% 0.5% 0.5% 1.0% 1.0% 1.0% 1.0% 1.0% 1.0% 1.0% 1.0%
SOT-23 TSOT-23 SOT-23 TSOT-23 SOT-23 TSOT-23 SOT-23 TSOT-23 SOT-23 TSOT-23 SOT-23 TSOT-23 SOT-23 TSOT-23 SOT-23 TSOT-23
- 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to + 125oC - 40oC to +125oC - 40oC to +125oC - 40oC to +125oC - 40oC to +125oC
7
AME, Inc.
AME431B
Adjustable Precision Shunt Regulator
n Ordering Information (contd.)
Part Number
AME431BAJATB25
Marking*
AME25 431B AJATB yyww AME25 431B AJATB yyww AME25 431B AJATA yyww AME25 431B AJATA yyww BAWww BAWww BAWww BAWww BAVww BAVww BAVww BAVww
Reference Voltage Accuracy Package
2.5V 1.0% TO92-3
Temp. Range
- 40oC to +125oC
AME431BAJATB25Z
2.5V
1.0%
TO92-3
- 40oC to +125oC
AME431BAJATA25
2.5V
0.5%
TO92-3
- 40oC to +125oC
AME431BAJATA25Z
2.5V
0.5%
TO92-3
- 40oC to +125oC
AME431BAJEVA12 AME431BAJEVA12L AME431BAJEVA12Z AME431BAJEVA12Y AME431BAJEVB12 AME431BAJEVB12L AME431BAJEVB12Z AME431BAJEVB12Y
1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V
0.5% 0.5% 0.5% 0.5% 1.0% 1.0% 1.0% 1.0%
SOT-25 TSOT-25 SOT-25 TSOT-25 SOT-25 TSOT-25 SOT-25 TSOT-25
- 40oC to +125oC - 40oC to +125oC - 40oC to +125oC - 40oC to +125oC - 40oC to +125oC - 40oC to +125oC - 40oC to +125oC - 40oC to +125oC
8
AME, Inc.
AME431B
Adjustable Precision Shunt Regulator
n Absolute Maximum Ratings
Parameter
Cathode Current AME431Bxxxxx25 AME431Bxxxxx12 Cathode Voltage AME431Bxxxxx25 40 150 18
Maximum
AME431Bxxxxx12 100
Unit
mA
V
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device
n Recommended Operating Conditions
Parameter
Supply Current
Rating
1 ~ 100 AME431Bxxxxx12 1.24 to 16
Unit
mA
Operation Voltage Range AME431Bxxxxx25 Ambient Temperature Range Junction Temperature -40 to +125 -40 to +125 2.50 to 36
V
o
C C
o
n Thermal Information
Parameter
SOT-23 SOT-25 Thermal Resistance SOT-89 TO-92 SO-8 Maximum Junction Temperature Maximum Lead Temperature (10 Sec)
Maximum
325 325 180 180 124 150 300
Unit
o
C/W
o o
C C
9
AME, Inc.
AME431B
Adjustable Precision Shunt Regulator
n Electrical Specifications (AME431Bxxxxx25)
TA = 250C, IREF=10mA unless otherwise specified Parameter Reference Voltage 0.5% 1.0% Test Symbol Circuit 1 VREF VREF Test Condition VKA = VREF, IKA=10mA VKA = VREF IKA=10mA VREF VKA 0oC ~ +70oC -40 C ~ +125 C VKA= 2 IKA=10mA 10V to VREF VKA= 36V to 10V
o o
Min 2.4875 2.475 -
Typ
Max
Units V
2.500 2.5125 2.500 4.5 4.5 -1.0 -0.5 0.7 2.525 8 10 -2.7
Deviation of Reference Voltge Over Temperature Ratio of Change in Reference Voltage to the Change in Cathode Voltage
1
mV
mV/V -2.0 4.0 A
Reference Current Deviation of Reference Current Over Full Temperature Range Minimum Cathode Current for Regulation Off-State Cathode Current
2
IREF
IKA=10mA R1=10K, R2= R1=10K, R2= IKA=10mA TA= -40 C ~ +125 C
o o
2
IREF IKA (MIN) IKA (OFF) ZKA
-
0.4
1.2
A
1
VKA=VREF
-
0.4
1.0
mA A
3
VKA=36V,VREF =0V VKA = VREF , IKA=1 to 100mA F<1KHz
-
0.05
1.0
Dynamic Impendance
1
-
0.15
0.5
VIN
R1 VKA
VIN
R3 V KA IKA R1 IREF
VKA=VREF (1+R1/R2)+IREFR1
VIN IOFF
VKA
IKA
R2
VREF
VREF
Figure1. Test Circuit4 for VKA=VREF
10
Figure2. Test Circuit for VKA>VREF
Figure3. Test Circuit for IOFF
AME, Inc.
AME431B
Adjustable Precision Shunt Regulator
n Electrical Specifications (AME431Bxxxxx12)
TA = 250C, IREF=10mA unless otherwise specified Parameter Reference Voltage 0.5% 1.0% Test Symbol Circuit 1 VREF VREF Test Condition VKA - VREF , IKA=10mA VKA = VREF IKA=10mA VREF VKA 0oC ~ +70oC -40 C ~ +85 C VKA 2 IKA=10mA
= o o
Min
Typ
Max 1.246
Units V
1.234 1.240
1.228 1.240 1.252 2 3 -0.5 -0.5 0.15 10 10 -1.5
Deviation of Reference Voltge Over Temperature Ratio of Change in Reference Voltage to the Change in Cathode Voltage Reference Input Current Deviation of Reference Current Over Full Temperature Range Minimum Cathode Current for Regulation Off-State Cathode Current
1
mV
5V to VREF VKA = 16V to 5V
mV/V -1.5 0.4 A
2
IREF
IKA=10mA R1=10K, R2= R1=10K, R2= IKA=10mA TA= -40 C ~ +85 C
o o
2
IREF IKA (MIN) IKA (OFF) ZKA
-
0.1
0.4
A
1 3
VKA=VREF VKA=18V, VREF =0V VKA = VREF , IKA=1 to 100mA F<1KHz
-
55 0.04
80 0.1
A A
Dynamic Impendance
1
-
0.05
0.15
11
AME, Inc.
AME431B
Cathode Current vs. Cathode Voltage
150
Adjustable Precision Shunt Regulator
Current vs. Cathode Voltage
800
VKA=VREF
Cathode Current (uA)
V KA=VREF T A= 25oC
Cathode Current (mA)
T A= 25oC
100
600
50
400 340 200
0
0
-50
-200
-100 -2
-1
0
1
2
3
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.495
Cathode Voltage (V)
Cathode Voltage (V)
Reference Current vs. Temperature
1.7 1.6
2.520 2.515
Reference Voltage vs. Cathode Current
Reference Current (uA)
1.5 1.4 1.3 1.2 1.1 1.0 -45
Reference Voltage (V)
2.510 2.505 2.500 2.495 2.490 2.485 2.480 10
-5
25
55
85
115 125
20
30
40
50
60
70
80
90
100
110
Temperature (oC)
Cathode Current (mA)
Small Signal Voltage Gain vs. Frequency
Input and Output Voltage (V)
5
220
Output
Input
4
3
Pulse Generator f=100KHz
50
2
Output
1
0
GND
0 2 4 6
Time (uS)
12
AME, Inc.
AME431B
Adjustable Precision Shunt Regulator
Small Signal Voltage Gain vs. Frequency
1K 60 10K 100K 1000K 60
50
T A= 25oC IKA= 10mA
50
Output 15K 10uF IKA 242
40
40
Av (dB)
30
30
20
20
8.2K
10 10
0 1K
0 10K 100K 1000K
GND
Small Signal Frequency
Reference Impedance vs. Frequency
1K
Reference Impedance ()
IKA= 10mA
10
TA= 25oC
Output IK A
50
1
0.1 1K
10K
100K
1000K
GND
Frequency (Hz)
Stability Boundary Conditions vs. Load Capacitance
100 90
Cathode Current (mA)
80 70 60 50 40 30 20 10
A: - - - VKA=5V B: ___ VKA=10V VKA=15V: No oscillation
R1(10K)
IKA
150
A
R2
B
0.1uF 1uF 2uF
0 0.01uF
Load Capacitance
13
AME, Inc.
AME431B
Impedance vs. Temperature
0.25
2.510
Adjustable Precision Shunt Regulator
Reference Voltage vs. Temperature
Impedance (1mA-100mA) ohm
0.20
2.505
VKA= VREF IKA=10mA
0.15
Refer ence Voltage (V)
-5 25 55 85 115 125
2.500
0.10
2.495
0.05
2.490
0.00 -45
2.485 -45
-5
25
55
85
115
125
Temperature (oC)
Temperature (oC)
Delta Reference Voltage vs. Temperature
0 -0.1
70 60
Off-State Current vs. Temperature
Delta Vref/Delta VK (mV/V)
-0.2
Off-State Current (nA)
-5 25 55 85 115 125
50 40 30 20 10 0 -45
-0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 -45
-5
25
55
85
115 125
Temperature ( o C)
Temperature (oC)
14
AME, Inc.
AME431B
Adjustable Precision Shunt Regulator
n Package Dimension
TO-92-3 (bulk pack)
SYMBOLS A b E e e1 L R MILLIMETERS MIN MAX
4.95 0.51 3.94 2.67 1.40 15.49 2.41 0.56 4.95
INCHES MIN
0.1701 0.0142 0.1299 0.0949 0.0449 0.5000 0.0850 0.0161 0.1752
MAX
0.1949 0.0201 0.1551 0.1051 0.0551 0.6098 0.0949 0.0220 0.1949
Top View
4.32 0.36 3.30 2.41 1.14 12.70 2.16 0.41 4.45
Side View
W D
Notes: 1. Package outline exclusive of any mold flashes dimension. 2. Package outline exclusive of burr dimension. 3. Lead pitch=2.54mm is bulk pack. 4. Lead pitch=5.08mm is tape pack.
TO-92-3 (tape pack)
SYMBOLS A b E e e1 L R W D
MILLIMETERS MIN MAX
4.95 0.51 3.94 5.08 2.54 15.49 2.41 0.56 4.95
INCHES MIN
0.1701 0.0142 0.1299 0.1961 0.0980 0.5000 0.0850 0.0161 0.1752
MAX
0.1949 0.0201 0.1551 0.2000 0.1000 0.6098 0.0949 0.0220 0.1949
Top View
4.32 0.36 3.30 4.98 2.49 12.70 2.16 0.41 4.45
Side View
Notes: 1. Package outline exclusive of any mold flashes. 2. Package outline exclusive of burr dimension. 3. Lead pitch=2.54mm is bulk pack. 4. Lead pitch=5.08mm is tape pack.
15
AME, Inc.
AME431B
Adjustable Precision Shunt Regulator
n Package Dimension
SOT-23
Top View D Side View C
SYMBOLS
L
MILLIMETERS MIN
1.00 0.00 0.35 0.09 2.70 1.40
INCHES MIN
0.0394 0.0000 0.0138 0.0035 0.1063 0.0551
MAX
1.40 0.15 0.50 0.25 3.10 1.80
MAX
0.0551 0.0059 0.0197 0.0098 0.1220 0.0709
A A1 b C D
E
e
H
c1
E e H L
1.90 BSC 2.40 3.00
0.0748 BSC 0.09449 0.11811 0.0138BSC 0o 10o
Front View
0.35BSC 0o 10o
A
?1
A1 Top View D b
TSOT-23
Side View C
SYMBOLS
L
MILLIMETERS MIN MAX
1.30 0.50 0.25 3.10 1.80
INCHES MIN
0.0315 0.0138 0.0031 0.1063 0.0472
MAX
0.0512 0.0197 0.0098 0.1220 0.0709
A+A1
E H
0.80 0.35 0.08 2.70 1.20
b C D E
c1
e
e H L
1.90 BSC 2.40 3.00
0.0748 BSC 0.09449 0.11811 0.0138BSC
o
Front View
0.35BSC 0
o
16
A1
b
A
1
10
0
o
10
o
AME, Inc.
AME431B
Adjustable Precision Shunt Regulator
n Package Dimension
SOT-89
Top View D D1 H
POLISH
Side View
SYMBOLS A A1 C D
MILLIMETERS MIN
1.39
INCHES MIN MAX
MAX
1.60
0.05472 0.06299 0.0315REF 0.01378 0.01732 0.17283 0.1811
0.8REF 0.35 4.39 1.35 2.28 0.44 4.60 1.83 3.60
E
A1
D1 E
C
0.05315 0.07205 0.08976 0.14173 0.1181REF 0.0276REF 0.0590REF
S1 e Front View
MATTE FINISH
e H S1
3.00REF 0.70REF 1.50REF
A
POLISH
SO-8
Top View Side View C
SYMBOLS A
MILLIMETERS MIN
5.58 3.55 0.50 0.30 9.65 3.53 0.50 1.14 2.28 12.70 14.22
INCHES MIN
0.2197 0.1398 0.0197 0.0118 0.3799 0.1390 0.0197 0.0449 0.0898 0.5000 0.5600
MAX
7.49 4.83 1.40 1.15 10.67 4.09 1.15 1.78 2.80 14.74 16.51
MAX
0.2949 0.1900 0.0550 0.0453 0.4200 0.1610 0.0453 0.0700 0.1102 0.5803 0.6500
E
C D E
D
c
L
G I K M N
Front View
7o(4X)
A2
A
O
A1 e B
P
17
AME, Inc.
AME431B
Adjustable Precision Shunt Regulator
n Package Dimension
SOT-25
Top View D L Side View
SYMBOLS A
MILLIMETERS MIN MAX
INCHES MIN MAX
1.20REF 0.00 0.30 2.70 1.40 0.15 0.55 3.10 1.80
0.0472REF 0.0000 0.0118 0.1063 0.0551 0.0059 0.0217 0.1220 0.0709
H
E
A1 b D
S1 e c1
E e H L 1
1.90 BSC 2.60 3.00
0.07480 BSC 0.10236 0.11811 0.0146BSC
o
Front View A
0.37BSC 0
o
10
0o
10o
S1
0.95BSC
0.0374BSC
b
TSOT-25
Top View D L Side View
A1
SYMBOLS A+A1
MILLIMETERS MIN
0.90 0.30 2.70 1.40
INCHES MIN
0.0354 0.0118 0.1063 0.0551
MAX
1.25 0.50 3.10 1.80
MAX
0.0492 0.0197 0.1220 0.0709
H
b D E
S1 e c1
E
e H L 1
1.90 BSC 2.40 3.00
0.07480 BSC 0.09449 0.11811 0.0138BSC
o
0.35BSC 0
o
Front View A
10
0o
10o
S1
0.95BSC
0.0374BSC
b
18
A1
www.ame.com.tw
E-Mail: sales@ame.com.tw
Life Support Policy: These products of AME, Inc. are not authorized for use as critical components in life-support devices or systems, without the express written approval of the president of AME, Inc. AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information. (c) AME, Inc. , December 2004 Document: BCD-DS431B-D
Corporate Headquarter
AME, Inc.
2F, 302 Rui-Guang Road, Nei-Hu District Taipei 114, Taiwan. Tel: 886 2 2627-8687 Fax: 886 2 2659-2989
U.S.A.(Subsidiary)
Analog Microelectronics, Inc.
3100 De La Cruz Blvd., Suite 201 Santa Clara, CA. 95054-2046 Tel : (408) 988-2388 Fax: (408) 988-2489

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