ADVANCED POWER ELECTRONICS CORP.
1
DESCRIPTION
The AP431 is a low voltage three terminal adjustable shunt
regulator with a guaranteed thermal stability over applicable
temperatur e range s. The output v olta ge ca n be s et to a ny v alue
between VREF (approximately 2.5 V) to 18V with two external
resistors (see application circuit). This device has a typical
output impedance of 0.2Ω. Active output circuitry provides a
very sharp turn on characteristic, making this device excel lent
replacement for Zener diodes in many applications.
The AP431 is characterized for operation from 0oC to 105oC,
and four package options (SOT-23, SOT-89, SO-8 and TO-92)
allow the designer the opportunity to select the proper package
for their application.
PIN CONFIGURATIONS
FEATURES
Low voltage operation (2.5V)
Adjustable output voltage V0 =VREF to 18V
Wide operating current rang e 0.4mA to 100mA
Low dynamic output impedance 0.5Ω max.
ESD rating is 5.5KV(Per MIL-STD-883D).
APPLICATIONS
Linear Regulators
Adjustable Supplies
Switching Power Supplies
Battery Operated Computers
Instrumentation
Computer Disk Drives
BLOCK DIAGRAM
SYMBO L DIAGRAM
+
-
Vref
Ref
Cathode
Anode
Cathode
Ref
Anode
SOT-23 Lead (Top View)
SOT-89 Lead (Top View)
SO-8 (Top View)
TO-92 (Top View)
2
1
3
Cathode
Reference
Anode
3
2
1
CATHODE
ANODE
REF
Cathode
Referenc
e
Anode
3
2
1
1
2
3
45
6
7
8Reference
Cathode
Anode
Anode
Anode
Anode
NC
NC
A
PEC ADJ USTABLE P RECI SION SHU NT
REGULATOR AP431
Pb Free Platin
g
Product
Halogen Free Product
ADVANCED POWE R E LECTRONICS CORP.
2
ABSOLUTE MAXIMUM RATINGS OVER OPERATING FREE-AIR TEMPERATURE RANGE
Parameter Symbol Maximum Units
Cathode Voltage VKA 18 V
Conti n uous Ca t ho de Curre nt I KA 150 mA
Reference Current I REF 10 mA
Operating Junction Temperature Range TJ 125
℃
Storag e Temperature Range TSTG -65 to 150 ℃
Thermal Resistance θ JA 156
℃/W
Lead Temperature (Soldering) 10 seconds TLEAD 260 ℃
ELECTRICAL CHARACTERISTICS TA = 25℃
℃℃
℃
A P431
PARAMETER SYMB
OL TEST
CIRCUIT TEST CONDITIONS MIN TYP MAX
UNIT
Referen ce vo ltage 1% Vref 1 VKA = Vref IKA = 10mA 2470 2495 2520 mV
Deviation of referenc e
voltage Over full
temperature range VI(dev) 1
VKA = Vre f , IKA = 10mA
TA = full range 4 25 mV
Ratio of change in reference
voltage to the chan ge in
cathode voltage
∆ Vref
________
∆ VKA 2 IKA = 10mA
∆ VKA = 10 V - Vref -1.4 -2.7 mV/V
Reference current Iref 2 IKA = 10mA, R1=10kΩ, R2 = ∞ 2 4
µA
Deviation of R eference
current over full temperature
range II(dev) 2
IKA = 10mA, R1=10kΩ, R2 = ∞
TA = full range 0.4 1.2
µA
Minimum cathode current
for regula tion Imin 1 VKA = Vref 0.4 1 mA
Off-state cathode current Ioff 3 VKA = 18V, Vref = 0 0.1 1 µA
Dynamic impedance rZ 1
IKA = 1mA to 100mA, VKA = Vref
f ≤ 1kHZ 0.2 0.5 Ω
APEC ADJ USTABLE P RECI SION SHU NT
REGULATOR AP431
ADVANCED POWE R E LECTRONICS CORP.
3
TYPICAL PERFORMANCE CHARACTERISTICS
CATHODE CURRENT
Vs.
CATHODE VOLTAGE
Cathode Current (mA)
Cathode Voltage (V)
-100
-75
-50
-25
0
25
50
75
100
125
150
-2-10123
V
KA
= Vref
T
A
= 25
o
C
2480
2485
2490
2495
2500
2505
2510
2515
2520
- 20 0 20 40 60 80 100 120
VKA =Vref
IKA =10m A
REFERENCE VOLTAGE
Vs.
JUNCTION TEMPERATURE
Reference Voltage (mV)
Junction Temperature ( oC)
0
0. 5
1
1. 5
2
2. 5
3
- 20 0 20 40 60 80 100 120
R1 = 10kΩ
R2 = ∞
I
KA
=10mA
REFERENCE INPUT CURRENT
Vs.
JUNCTION TEMPERATURE
Reference Current (µA)
Junction Temperature (
o
C)
APEC ADJ USTABLE PRECISI O N SHU NT
REGULATOR
AP431
CATHODE CURRENT
Vs.
CATHODE VOLTAGE
Cathode Current (µA)
Cathode Voltage (V)
- 200
0
200
400
600
800
-101 23
VKA = Vr e f
TA = 2 5 oC
ADVANCED POWE R E LECTRONICS CORP.
4
TEST CIRCUI TS
APPLICATION CIRCUIT
VOUT
Vref
VIN
R1
R2
R
GND
AP431
= Vr ef (1+ R1/R2 )
VOUT
V
Vref
Input KA
IKA
VKA
Vref
Input
IKA
Iref
R1
R2 VKA=Vref (1+ R1/R2 ) + Iref x R1
V
Input KA
Ioff
Test Circuit 1:
VKA = Vref Test Circuit 2:
VKA > Vref Test Circuit 3:
Off State Current
APEC ADJ USTABLE P RECI SION SHU NT
REGULATOR AP431
ADVANCED POWE R E LECTRONICS CORP.
5
OUTLINE DRAWING SOT-23
OUTLINE DRAWING SOT-89
OUTLINE DRAWING SO-8
H
E
DB
B1
A1
A
C
SYMBOL MIN MAX
A 1.5 1.72
A1 0.1 0.22
B 0.25 0.5
B1
C 0.18 0.25
D 4.83 4.93
H 5.84 6.14
E 3.81 3.96
1.27 BSC
APEC ADJ USTABLE P RECI SION SHU NT
REGULATOR AP431
D
E1 E
e
D1
L
L1
AA1
A2
A3
θ
SYMBOL MIN NOM MAX
A 0.20 0.30 0.40
A1--0.00 --
A2 -- 0.10 --
A3 0.70 0.80 0.90
D1 0.30 0.40 0.50
e 1.70 2.00 2.30
D 2.80 2.90 3.00
E 2.25 2.50 2.75
E1 1.40 1.50 1.60
L 2.25 2.50 2.75
L1 1.40 1.50 1.60
θ--2O--
I
H
D
F
G
E
B
C
Unit: :mm
Unit: :mm
Unit: :mm
SYMBOL MIN MAX
A 4.40 4.60
B 4.05 4.25
C 1.50 1.70
D 2.40 2.60
E 0.31 0.46
F 1.48 1.52
G 2.96 3.04
H 1.40 1.60
I 0.35 0.41
ADVANCED POWE R E LECTRONICS CORP.
6
OUTLINE DRAWING TO-92
ORDERING INFORMATION
Data & specifications subject to change without notice
20090826
A
A
e
L
E
SEATING
PLANE
b
D
D1
SYMBOL MIN NOM MAX
A 3.45 3.56 3.66
A1 1.22 1.3 1.37
b-0.38-
D1 4.27 4.52 4.78
D 4.14 4.29 4.45
E 4.32 4.57 4.83
e-1.27-
L 12.98 13.49 14.00
APEC ADJ USTABLE P RECI SION SHU NT
REGULATOR AP431
Unit: mm
AP431 X - HF
Circuit Type:
2.5V Precision Adjustable
Shunt Regulator / Amplifier
Temperature Range:
0～ +105℃ Package:
M = SO-8
N = SOT-23
T = TO-92
G = SOT-89
Halogen Free
