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AME
AME431B-2.5V
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 2.5V for AME431Bxxxxx25. The output voltage can be set to 2.5V to 36V for VREF=2.5V part type with two external resistors.
VREF
Adjustable Precision Shunt Regulator
n Functional Block Diagram
Cathode
REF
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.
Anode
n Features
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 7 Packages: TO-92-3, SOT-23, SOT-89, SOP-8, SOT-25, TSOT-23 and TSOT-25 l All AME' s Lead Free Products Meet RoHS Standards
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
Rev.B.04
1
AME
AME431B-2.5V
n Typical Applications
Shunt Regulator
R3 VIN VOUT
Adjustable Precision Shunt Regulator
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
Rev.B.04
AME
AME431B-2.5V
n Typical Applications (contd.)
Precision 5V 1.5A Regulator
VIN R1 8.2K AME1117 Adjust R2 250
Adjustable Precision Shunt Regulator
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
Rev.B.04
3
AME
AME431B-2.5V
n Pin Configuration
SOT-23/TSOT-23 Top View
3
Adjustable Precision Shunt Regulator
SOT-23/TSOT-23 Top View AME431BAJETXXXX 1. Cathode 2. REF
3
AME431BBJETXXXX 1. REF 2. Cathode
AME431B
3. Anode * Die Attach:
AME431B
3. Anode * Die Attach:
1
2
Conductive Epoxy
1
2
Conductive Epoxy
SOT-89 Front View AME431BAJFTXXXX 1. REF 2. Anode 3. Cathode
1 2 3
SOT-25/TSOT-25 Top View
5 4
AME431BAJEVXXXX 1. NC 2. NC
AME431B
AME431B
3. Cathode 4. REF 5. Andode
* Die Attach: Conductive Epoxy
1 2 3
* Die Attach: Non-Conductive Epoxy SOP-8 Top View
8 7 6 5
TO-92-3 Top View AME431BAJHAXXXX 1. Cathode 2. Anode 3. Anode
AME431B
AME431BAJATXXXX 1. REF 2. Anode 3. Cathode * Die Attach: Conductive Epoxy
AME431B
4. NC 5. NC 6. Anode 7. Anode 8. REF * Die Attach: Conductive Epoxy
1 2 3
1
2
3
4
4
Rev.B.04
AME
AME431B-2.5V
n Ordering Information AME431B x x x x x xx x - x
Special Feature2 Special Feature1 Reference Voltage Accuracy Number of Pins Package Type Operating Ambient Temperature Range Pin Configuration
Number of Pins A: 8 T: 3 V: 5
Adjustable Precision Shunt Regulator
Pin Configuration
Operating Ambient Temperature Range
Package Type
Accuracy
Reference Voltage
Special Feature1
Special Feature2 (For TO-92 Package Only) Package Taping Bulk Lead Pitch 5.08mm 2.54mm
A
(SOT-23) (TSOT-23)
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
J: -40OC to +125OC
A: TO-92 E: SOT-2X F: SOT-89 H: SOP
A: 0.5% B: 1.0%
25: 2.5V
Y: Lead free & Low profile Z: Lead free
N/A: 1:
B
(SOT-23) (TSOT-23)
A
(SOT-89)
A
(TO-92-3)
A
(SOP-8)
A
(SOT-25) (TSOT-25)
Rev.B.04
5
AME
AME431B-2.5V
n Ordering Information
Part Number
AME431BAJETA25Z AME431BAJETA25Y AME431BBJETA25Z AME431BBJETA25Y AME431BAJETB25Z AME431BAJETB25Y AME431BBJETB25Z AME431BBJETB25Y AME431BAJFTA25Z AME431BAJFTB25Z AME431BAJHAB25Z
Adjustable Precision Shunt Regulator
Marking*
BAFww BAFww BAGww BAGww AZAww AZAww AZBww AZBww A431B BKXww A431B BJBww 431B BJCww AME25 431B AJATB yyww AME25 431B AJATB yyww AME25 431B AJATA yyww AME25 431B AJATA yyww
Reference Operating Ambient Accuracy Package Voltage Temperature Range
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% 1.0% 1.0% 1.0% 1.0% 0.5% 1.0% 1.0% SOT-23 TSOT-23 SOT-23 TSOT-23 SOT-23 TSOT-23 SOT-23 TSOT-23 SOT-89 SOT-89 SOP-8 - 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
AME431BAJATB25Z
2.5V
1.0%
TO-92-3
- 40oC to +125oC
AME431BAJATB25Z-1
2.5V
1.0%
TO-92-3
- 40oC to +125oC
AME431BAJATA25Z
2.5V
0.5%
TO-92-3
- 40oC to +125oC
AME431BAJATA25Z-1
2.5V
0.5%
TO-92-3
- 40oC to +125oC
Note: yyww & ww represents the date code and pls refer to Date Code Rule on Package Dimension. * A line on top of the first letter represents lead free plating such as BAFww. Please consult AME sales office or authorized Rep./Distributor for output voltage and package type availability.
6
Rev.B.04
AME
AME431B-2.5V
n Absolute Maximum Ratings
Parameter
Cathode Current Cathode Voltage
Adjustable Precision Shunt Regulator
Maximum
150 40
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 Operation Voltage Range Ambient Temperature Range Junction Temperature Range Storage Temperature Range TA TJ TSTG
Rating
1 to 100 2.5 to 36 -40 to +125 -40 to +125 -65 to +150
Unit
mA V
o
C C C
o
o
Rev.B.04
7
AME
AME431B-2.5V
n Thermal Information
Parameter Package
SOT-23** TSOT-23 SOT-89* Thermal Resistance (Junction to Case) TO-92-3** SOP-8** SOT-25** TSOT-25 SOT-23 TSOT-23 SOT-89 Thermal Resistance (Junction to Ambient) TO-92-3 SOP-8 SOT-25 TSOT-25 SOT-23 TSOT-23 SOT-89 Internal Power Dissipation TO-92-3 SOP-8 SOT-25 TSOT-25 Solder Iron (10 Sec)*** * Measure JC on backside center of tab. ** Measure JC on center of molding compound if IC has no tab. *** MIL-STD-202G 210F Non-Conductive Epoxy Conductive Epoxy PD Non-Conductive Epoxy Conductive Epoxy JA Non-Conductive Epoxy Conductive Epoxy JC
Adjustable Precision Shunt Regulator
Die Attach
Symbol
Maximum
81 40 80 60 140
Unit
o
C/W
260 180 150 150 280 400 550 625 810 400 350
o
mW
C
8
Rev.B.04
AME
AME431B-2.5V
n Electrical Specifications (AME431Bxxxxx25)
TA = 250C, IREF = 10mA unless otherwise specified
Parameter 0.5% Reference Voltage 1.0% 1 VREF VREF V KA = V REF, IKA = 10mA VKA = V REF IKA = 10mA VREF V KA 0oC to 70oC -40 C to +125 C V KA = 2 IKA = 10mA 10V to VREF V KA = 36V to 10V
o o
Adjustable Precision Shunt Regulator
Test Symbol Circuit
Test Condition
Min 2.4875 2.4750 -
Typ 2.50 2.50 4.5 4.5 -1.0 -0.5 0.7
Max 2.5125 2.5250 8 18 -2.7
Units V
Deviation of Reference Voltage 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 =
o
2
IREF IKA (MIN) IKA (OFF) ZKA
IKA = 10mA TA = -40 C to +125 C
o
0.4
1.2
A
1
V KA = V REF
-
0.4
1.0
mA A
3
V KA = 36V, VREF = 0V VKA = V REF , 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 Circuit for VKA=VREF
Rev.B.04
Figure2. Test Circuit for VKA>VREF
Figure3. Test Circuit for IOFF
9
AME
AME431B-2.5V
Cathode Current vs. Cathode Voltage
150
Adjustable Precision Shunt Regulator
Current vs. Cathode Voltage
800
VKA=VREF
Cathode Current (mA)
Cathode Current (A)
T A=
100
25oC
VKA=VREF T A= 25oC
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
Reference Voltage vs. Cathode Current
2.520 2.515
Reference Current (A)
Reference Voltage (V)
1.5 1.4 1.3 1.2 1.1 1.0 -45
2.510 2.505 2.500 2.495 2.490 2.485 2.480 10
-5
25
55 o
85
115 125
20
30
40
50
60
70
80
90
100
110
Temperature ( C)
Cathode Current (mA)
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
10
Rev.B.04
AME
AME431B-2.5V Adjustable Precision Shunt Regulator
Small Signal Voltage Gain vs. Frequency
Input and Output Voltage (V)
5
Input
4
220
Output
V REF = 2.5V
3
2
Output
Pulse Generator f=100KHz
50
1
0
GND
0 2 4 6
Time (S)
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)
A: - - - VKA=5V B: ___ VKA=10V VKA=15V: No oscillation
R1(10K) IKA 150
80 70 60 50 40 30 20 10
A
R2
B
0.1uF 1uF 2uF
0 0.01uF
Load Capacitance
Rev.B.04
11
AME
AME431B-2.5V
Delta Reference Voltage vs. Temperature
0
2.0 1.8
Adjustable Precision Shunt Regulator
Off-State Current vs. Temperature
Delta Vref/Delta VK(mV/V)
-0.2 -0.4 -0.6 -0.8 -1 -1.2 -1.4 -45
Off-State Current (A)
VREF = 2.5V
VKA= 36V VREF = 0
1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
-25
0
25
55
70
100
125
-40
-20
0
20
40
60
80
100
120
Temperature (oC)
Temperature (oC)
Impedance vs. Temperature
0.25
2.510
Reference Voltage vs. Temperature
Impedance (1mA-100mA) ohm
0.20
Reference Voltage (V)
2.505
VKA= VREF IKA=10mA
0.15
2.500
0.10
2.495
0.05
2.490
0.00 -45
-5
25
55 o
85
115 125
2.485 -45
-5
25
55
85
115
125
Temperature ( C)
Temperature (oC)
12
Rev.B.04
AME
AME431B-2.5V
n Date Code Rule
Marking A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A Date Code W W W W W W W W W W W W W W W W W W W W Year xxx0 xxx1 xxx2 xxx3 xxx4 xxx5 xxx6 xxx7 xxx8 xxx9
Adjustable Precision Shunt Regulator
n Tape and Reel Dimension
SOT-25
P
W AME PIN 1 AME
Carrier Tape, Number of Components Per Reel and Reel Size
Package SOT-25 Carrier Width (W) 8.00.1 mm Pitch (P) 4.00.1 mm Part Per Full Reel 3000pcs Reel Size 1801 mm
Rev.B.04
13
AME
AME431B-2.5V
n Tape and Reel Dimension
TSOT-25
P
Adjustable Precision Shunt Regulator
W AME PIN 1 AME
Carrier Tape, Number of Components Per Reel and Reel Size Package TSOT-25 Carrier Width (W) 8.00.1 mm Pitch (P) 4.00.1 mm Part Per Full Reel 3000pcs Reel Size 1801 mm
SOT-89
P
W AME PIN 1 AME
Carrier Tape, Number of Components Per Reel and Reel Size Package SOT-89 Carrier Width (W) 12.00.1 mm Pitch (P) 4.00.1 mm Part Per Full Reel 1000pcs Reel Size 1801 mm
14
Rev.B.04
AME
AME431B-2.5V
n Tape and Reel Dimension
SOT-23
P
Adjustable Precision Shunt Regulator
W AME PIN 1 AME
Carrier Tape, Number of Components Per Reel and Reel Size
Package SOT-23 Carrier Width (W) 8.00.1 mm Pitch (P) 4.00.1 mm Part Per Full Reel 3000pcs Reel Size 1801 mm
TSOT-23
P
W AME PIN 1 AME
Carrier Tape, Number of Components Per Reel and Reel Size
Package TSOT-23 Carrier Width (W) 8.00.1 mm Pitch (P) 4.00.1 mm Part Per Full Reel 3000pcs Reel Size 1801 mm
Rev.B.04
15
AME
AME431B-2.5V
n Tape and Reel Dimension
SOP-8
P
Adjustable Precision Shunt Regulator
PIN 1 W
AME AME
Carrier Tape, Number of Components Per Reel and Reel Size
Package SOP-8 Carrier Width (W) 12.00.1 mm Pitch (P) 4.00.1 mm Part Per Full Reel 2500pcs Reel Size 3301 mm
TO-92-3
AME AME
PIN 1
W
P
Carrier Tape, Number of Components Per Reel and Reel Size
Package TO-92-3
Carrier Width (W) 18.0
+1.0 mm -0.5
Pitch (P) 12.70.2 mm
Part Per Full Reel 2000pcs
Reel Size N/A
16
Rev.B.04
AME
AME431B-2.5V
n Package Dimension
TO-92-3 (bulk pack)
SYMBOLS
Top View L e e1 w
Adjustable Precision Shunt Regulator
MILLIMETERS MIN MAX
4.95
INCHES MIN
0.1102
MAX
0.1949
A b E
PIN 1 D
2.80
0.40REF 3.94REF 2.54REF 1.27REF 12.70 2.29 0.35 3.80 0.76 4.95 15.49
0.0157REF 0.1551REF 0.1000REF 0.0500REF 0.5000 0.6098
e e1 L
E-PIN C 1/16
R W
0.0902 0.0138 0.1496 0.0299 0.1949
Side View A R b E
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)
Top View L e e1
SYMBOLS A
MILLIMETERS MIN
2.80
INCHES MIN
0.1102
MAX
4.95
MAX
0.1949
w
PIN 1 D
b E e e1
E-PIN C 1/16
0.40REF 2.40 3.94
0.0157REF 0.0945 0.1551
5.08REF 2.54REF 12.70 2.00 0.35 3.80 0.76 4.95 15.49
0.2REF 0.1REF 0.5000 0.6098
Side View A R b E
L R W D
0.0787 0.0138 0.1496 0.0299 0.1949
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.
Rev.B.04
17
AME
AME431B-2.5V
n Package Dimension
SOT-23
Top View D c1 Side View
Adjustable Precision Shunt Regulator
SYMBOLS A A1 b D E
MILLIMETERS MIN
1.00 0.00 0.35 2.70 1.40
INCHES MIN
0.0394 0.0000 0.0138 0.1063 0.0551
MAX
1.40 0.15 0.50 3.10 1.80
MAX
0.0551 0.0059 0.0197 0.1220 0.0709
E
PIN 1 e
H
L
e H L 1
A
1.90 BSC 2.40 3.00
0.0748 BSC 0.09449 0.11811 0.0138BSC 0o 10o
0.35BSC 0o 10o
Front View
TSOT-23
Top View D c1 Side View
A1
b
SYMBOLS A+A1
MILLIMETERS MIN
0.80 0.35 2.70 1.20
INCHES MIN
0.0315 0.0138 0.1063 0.0472
MAX
1.30 0.50 3.10 1.80
MAX
0.0512 0.0197 0.1220 0.0709
E
H
b D E
PIN 1 e
L
e H L 1
1.90 BSC 2.40 3.00
0.0748 BSC 0.09449 0.11811 0.0138BSC 0o 10o
0.35BSC 0o 10 o
Front View
18
A1
b
A
Rev.B.04
AME
AME431B-2.5V
n Package Dimension
SOT-89
Top View D D1 Side View H
Adjustable Precision Shunt Regulator
SYMBOLS A A1
3'
MILLIMETERS MIN
1.39
INCHES MIN
0.05472
MAX
1.60
MAX
0.06299
0.8 REF 0.35 4.39 1.35 2.28 0.36 0.44 4.60 1.83 2.60 0.56
0.03150 REF 0.01378 0.17283 0.05315 0.08976 0.01417 0.01732 0.18110 0.07205 0.10236 0.02204
E
C
10'
A1
PIN 1 e Bottom View D2
D D1 E I e H
A
C
Front View
3.00 REF 0.70 REF 1.50 REF 2.05 1.50 2.60 1.85
0.11811 REF 0.02756 REF 0.05906 REF 0.08071 0.05905 0.10236 0.07283
MATTE FINISH
S1 E2 D2
E2 I
POLISH
S1
Rev.B.04
19
AME
AME431B-2.5V
n Package Dimension
SOP-8
Top View C Side View
Adjustable Precision Shunt Regulator
SYMBOLS A
MILLIMETERS MIN
1.35 0.10
INCHES MIN
0.05315
MAX
1.75 0.30
MAX
0.0689
H
E
A1 A2 B C
c
0.00394 0.01181 0.05799 REF 0.01299 0.02008 0.00748 0.00984 0.18898 0.20984 0.14961 0.15748 0.05000 BSC 0.01575 0.05000 0.22835 0.24803 0
o
1.473 REF 0.33 0.19 4.80 3.80 0.51 0.25 5.33 4.00
PIN 1
D
L
D E e L
Front View
7o(4X)
1.27 BSC 0.40 5.80 0
o
1.27 6.30 0.10 8
o
A2
A
H y
A1
e B
0.00394 8
o
SOT-25
Top View D c1 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
PIN 1 L S1 e
E e H L 1
1.90 BSC 2.60 3.00
0.07480 BSC 0.10236 0.11811 0.0146BSC
o
0.37BSC 0
o
Front View A
10
0o
10o
S1
0.95BSC
0.0374BSC
b
20
A1
Rev.B.04
AME
AME431B-2.5V
n Package Dimension
TSOT-25
Top View D c1 Side View
Adjustable Precision Shunt Regulator
SYMBOLS A+A1 b
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
E
D E e
L S1 e
PIN 1
1.90 BSC 2.40 3.00
0.07480 BSC 0.09449 0.11811 0.0138BSC
o
H L 1
0.35BSC 0
o
10
0o
10o
Front View A
S1
0.95BSC
0.0374BSC
b
Rev.B.04
A1
21
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. , November 2008 Document: ORT-DS431B-B.04
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

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