APL431L
Low Voltage Adjustable Precision Shunt Regulator
Features
•
•
•
•
•
•
•
•
•
Precise Reference Voltage to 1.24V
Guaranteed 0.5% or 1% Reference Voltage
Tolerance
Sink Current Capability, 80uA to 100mA
Quick Turn-on
Adjustable Output Voltage, V
O
= V
REF
to 20V
Low Operational Cathode Current, 80µA
Typical
0.1Ω Typical Output Impedance
SOT-23-3, SOT-23-5, TO-92 and SOT-89
Packages
Lead Free Available (RoHS Compliant)
General Description
The APL431L is a 3-terminal low voltage adjustable
precision reference with specified thermal stability
over applicable commercial temperature ranges. Out-
put voltage may be set to any value between V
ref
(1.
24 V) and 20 V with two external resistors (see Fig-
ure 2). When used with an photocoupler, the
APL431L is an ideal voltage reference in isolated feed-
back circuits for 3V to 12V switching-mode power
supplies. This device has a typical output imped-
ance of 0.1Ω. Active output circuitry provides a very
sharp turn-on characteristic, making the APL431L ex-
cellent replacements for zener diodes in many
applications, including on-board regulation and ad-
justable power supplies.
ANODE
NC
NC
3
1
2
5
1
2
4
3
Applications
•
•
•
Linear Regulators
REF CATHODE
REF ANO DE CATHO DE
SOT-23-3 (Top View)
3
C ATHO D E
SOT-23-5 (Top View)
Adjustable Power Supply
2
AN OD E
Switching Power Supply
1
R EF
1
2
3
REF
ANODE CATHODE
Symbol
REF
Anode
Cathode
TO-92 (Top View)
SOT-89 (Top View)
Functional Diagram
C athode
REF
+
_
V
ref
Anode
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Copyright
ANPEC Electronics Corp.
Rev. B.8 - Mar., 2005
1
www.anpec.com.tw
APL431L
Ordering and Marking Information
A P L 43 1 L
Le ad F re e C ode
H and ling C od e
T e m p. R a nge
P ac k a ge C od e
E le c . G rad e
E le c . G rad e
A : 0 .5 % R e fe re nc e V oltage T oleran c e
B : 1 % R efe re nce V oltage T oleranc e
P ac k a ge C od e
A : S O T -23 -3
B : S O T -23 -5
D : S O T -89
E : T O -9 2
Y :C hip F orm
T e m p. R a nge
C : 0 to 70
°
C
I : -40 to 85
°
C
H and ling C od e
P B : P las tic B a g
T B : T ape & B o x
T R : T a pe & R ee l
Le ad F re e C ode
L : L e a d F re e D e vic e B la n k : O rig in a l D evic e
A P L 431 L E :
APL
43 1L
X XX XX
A P L 431 L A /B :
43 1L
X XX XX - D ate C od e
A P L 431 L D :
A P L 431 L
X XX XX
X XX XX
- D a te C od e
Notes： ANPEC lead-free products contain molding compounds/die attach materials and 100% matte in plate
termination finish; which are fully compliant with RoHS and compatible with both SnPb and lead-free soldiering
operations. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J STD-020C for
MSL classification at lead-free peak reflow temperature.
Absolute Maximum Ratings
Symbol
V
KA
I
K
I
REF
θ
JA
Parameter
Cathode voltage
Continuous cathode current range
Reference current range
Thermal Resistance from Junction to Ambient in Free Air
SOT-23-3
SOT-23-5
SOT-89
TO-92
Operating Junction Temperature Range
Storage Temperature Range
Lead temperature range, T
s
(Soldering, 10sec)
Rating
20
100
3
416
357
250
250
-40 to 150
-65 to 150
260
Unit
V
mA
mA
°C/W
T
J
T
STG
T
SOL
°C
°C
°C
Copyright
ANPEC Electronics Corp.
Rev. B.8 - Mar., 2005
2
www.anpec.com.tw
APL431L
Electrical Characteristics
Symbol
Parameter
T
A
= 25°C ( unless otherwise noted)
Test Conditions
Unit
V
REF
Reference voltage
V
DEF
V
DEF
Temp Deviation
APL431L
Min. Typ. Max.
APL431LA 1.234 1.240 1.246
V
KA
=V
REF
, I
K
=10mA
T
A
=25°C, (Fig. 1)
APL431LB 1.228 1.240 1.252
APL431LA 1.222 1.240 1.258
T
A
=full range(see
Note1), (Fig.1)
APL431LB 1.215 1.240 1.265
T
A
=full range (see Note1)
5
15
V
KA
=V
REF
, I
K
=10mA (Fig. 1)
-0.2
0.15
0.05
0.01
0.01
0.1
80
-1.0
0.5
0.3
0.1
0.5
0.4
100
V
mV
∆V
REF
/
∆V
KA
I
REF
I
REF(DEV)
I
K(off)
Z
KA
I
K(MIN)
Ratio of Change in V
REF
I
K
=10mA, V
KA
=16V to V
REF
(Fig.
to Change in Cathods
2)
Votage
Reference Input Current I
K
=10mA,R
1
=10kΩ,R
2
=∞ (Fig. 2)
T
K
=full range (see Note 1),
I
REF
Temp Deviation
R
1
=10kΩ, R
2
=∞, I
K
=10mA,
(Fig. 2)
V
K
=6V
off-state cathode current V
REF
=0V, (Fig. 3)
V
K
=16V
V
KA
=V
REF
, I
K
=1mA to 100mA,
Dynamic Output
Impedance
f
≤1kHz
(Fig. 1)
Minimum Operating
V
KA
=V
REF
(Fig. 1)
Current
mV/V
µA
µA
µA
Ω
µA
Notes : 1.Full temperature range is 0°C to 70°C for APL431LXXC,and -40°C to 85°C for APL431LXXl.
Test Figures
V
IN
I
K
V
REF
V
o
V
IN
I
K(off)
V
o
Figure 1. Test Circuit for V
KA
=V
REF
, V
O
=V
KA
=V
REF
Figure 3. Test Circuit for I
K(off)
Copyright
ANPEC Electronics Corp.
Rev. B.8 - Mar., 2005
3
www.anpec.com.tw
Figure 2. Test Circuit for V >V
,
APL431L
Test Figures (Cont.)
V
IN
I
K
R1
I
REF
V
REF
V
REF
R
2
0.1
µ
F
Application Schematic
V
o
Precision Voltage Reference
V
IN
R
B
V
o
R
1
R2
Figure 2. Test Circuit for V
KA
>V
REF
,
V
O
= V
KA
= V
REF
×
(1+R
1
/R
2
) + I
REF
×
R
1
Precision High-Current Series Regulator
V
IN
R
B
R
1
V
R EF
0.1
µ
F
R
2
V
o
Notes for Application Circuits:
1) To improve the stability of output voltage, a 0.1µF
capacitor between cathode and anode of
APL431L is strongly recommended.
2)Set V
OUT
according to the following equation:
V
OUT
= V
REF
(1+R1/R2)+l
REF
R1
3)Choose the value for R
B
as follows:
A)The maximum limit for R
B
should be such that
the cathode current(l
K
) is greater than the mini
mum operating current (80µA) at V
IN(MIN)
.
B)The minimum limit for RB should be such that
the cathode current (l
K
) does not exceed 100mA
under all load conditions, and the instantaneous
turnon value for lk does not exceed 150mA. Both
of the following conditions must. be met:
V
IN(MAX)
R
B,Min
≥
150mA (to limit instantaneous turn-on l
K
)
R
B,Min
≥
V
IN(MAX)
-V
OUT
l
OUT(MIN)
+100mA
(to limit l
K
under normal operating conditions)
Copyright
ANPEC Electronics Corp.
Rev. B.8 - Mar., 2005
4
www.anpec.com.tw
APL431L
Typical Characteristics
Cathode Current vs. Cathode Voltage
250
200
100
Cathode Current vs. Cathode Voltage
V
KA
=V
REF
T
A
=25°C
V
KA
=V
REF
T
A
=25°C
Cathode Current (µA)
Cathode Current (mA)
-1
-0.5
0
0.5
1
1.5
150
100
50
0
-50
-100
-150
-200
-250
50
0
-50
-100
-1.5
-1
-0.5
0
0.5
1
1.5
Cathode Voltage (V)
Cathode Voltage (V)
Referemce Voltage vs.
Junction Temperature
1.26
0.18
Reference Input Current vs.
Junction Temperature
Reference Input Current (µA)
R
1
=10kΩ, R
2
=
∞
I
KA
=10mA
I
KA
=10mA
Reference Voltage (V)
0.16
1.25
0.14
1.24
0.12
1.23
0.10
1.22
-50
-25
0
25
50
75
100
125
150
0.08
-50
-25
0
25
50
75
100
125
150
Junction Temperature (°C)
Junction Temperature (°C)
Copyright
ANPEC Electronics Corp.
Rev. B.8 - Mar., 2005
5
www.anpec.com.tw
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