APL1431
Adjustable Precision Shunt Regulator
Features
•
•
•
•
•
•
•
•
•
Precise Reference Voltage to 2.500V
Guaranteed 0.5% or 1% Reference Voltage
Tolerance
Sink Current Capability , 1mA to 100mA
Quick Turn-on
Adjustable Output Voltage , V
O
= V
REF
to 20V
Low Operational Cathode Current , 250µA
Typical
0.1Ω Typical Output Impedance
SOT-23 , SOT-89 and TO-92 Packages
Lead Free and Green Devices Available
(RoHS Compliant)
General Description
The APL1431 is a 3-terminal adjustable voltage refer-
ence with specified thermal stability over applicable
commercial temperature ranges. Output voltage may
be set to any value between V
REF
(2.5 V) and 20 V with
two external resistors (see Figure 2). When used with
an photocoupler, the APL1431 is an ideal voltage ref-
erence in isolated feedback circuits for 2.5V to 12V
switching-mode power supplies. This device has a typi-
cal output impedance of 0.1Ω. Active output circuitry
provides a very sharp turn-on characteristic, making
the APL1431 excellent replacements for zener diodes
in many applications, including on-board regulation and
adjustable power supplies.
Applications
•
•
•
Linear Regulators
Adjustable Power Supply
Switching Power Supply
Pin Configuration
ANODE
Symbol
REF
Anode
Cathode
1
3
2
1
2
3
CATHODE REF
CATHODE ANODE
REF
Functional Diagram
Cathode
SOT-23 (Top View)
SOT-89 (Top View)
1
REF
2
ANODE
REF
+
_
3
CATHODE
V
ref
TO-92 (Top View)
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. A.4 - Mar., 2008
1
www.anpec.com.tw
APL1431
Ordering and Marking Information
APL1431
Assembly Material
Handling Code
Temp. Range
Package Code
Elec. Grade
APL1431 A :
1431
Elec. Grade
A : 0.5% Reference Voltage Tolerance
B : 1% Reference Voltage Tolerance
Package Code
A : SOT-23
D : SOT-89
E : TO-92
Y : Chip Form
Temp. Range
C : 0 to 70
°
C
I : -40 to 85
°
C
Handling Code
TB : Tape & Box
TR : Tape & Reel
Assembly Material
L : Lead Free Device
G : Halogen and Lead Free Device
APL1431 E :
APL
1431
XXXXX
XXXXX - Date Code
APL1431 D :
APL1431
XXXXX
XXXXX
- Date Code
Absolute Maximum Ratings
Symbol
V
KA
I
K
I
REF
θ
JA
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which
are fully compliant with RoHS. 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. ANPEC defines “Green” to mean lead-free (RoHS compliant) and halogen
free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by
weight).
Parameter
Cathode Voltage
Continuous Cathode Current Range
Reference Current Range
Thermal Resistance from Junction to Ambient in Free Air
SOT-23
SOT-89
TO-92
Ambient Temperature Range
APL1431XXC
APL1431XXI
Junction Temperature Range
APL1431XXC
APL1431XXI
Storage Temperature Range
Maximum Lead Soldering Temperature, 10 Seconds
Rating
21
120
3
416
250
250
0 to 70
-40 to 85
0 to 150
-40 to 150
-65 to 150
260
Unit
V
mA
mA
°C/W
°C
°C
°C
°C
T
A
T
j
T
STG
T
SDR
Electrical Characteristics
Symbol
V
REF
∆V
REF
/T
∆V
REF
/
∆V
KA
Parameter
Reference Voltage
Reference Voltage
Drift Over Temp.
Range
Voltage Ratio (open
loop gain)
T
A
= 25°C ( unless otherwise noted)
Test Conditions
Unit
V
APL1431
Min.
Typ.
Max.
APL431A 2.487
2.500
2.513
V
KA
=V
REF
,
*1
I
K
=10mA
2.500
2.525
APL431B 2.475
V
KA
=V
REF
, I
K
=10mA
*1
T
A
= 0 to 70°C
20
*1
30
T
A
= -40 to 85°C
*2
I
K
=10mA, V
KA
=V
REF
to 10V
-1.5
-3
*2
I
K
=10mA, V
KA
=V
REF
to 20V
-1.2
-2.5
2
mV
mV/V
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Mar., 2008
www.anpec.com.tw
APL1431
Electrical Characteristics (Cont.)
Symbol
I
REF
∆I
REF
/T
I
K(min)
I
K(off)
|Z
KA
|
I
K
Notes :
Parameter
Reference Current
T
A
= 25°C ( unless otherwise noted)
APL1431
Min.
I
K
=10mA,
*2
R
1
=10kΩ, R
2
=open
Reference Current
I
K
=10mA, R
1
=10kΩ,
*2
Drift
R
2
=open, T
A
= -40 to 85°C
*1
Min. Cathode Current V
KA
=V
REF
Off-state Cathode
*3
V
KA
= 20V, V
REF
= 0V
Current
V
KA
=V
REF
Dynamic Impedance
*1
I
K
=1mA to 100mA, f
≤1kHz
Cathode Current
*1 : use Figure 1
*2 : use Figure 2
*3 : use Figure 3
Typ.
1.0
0.3
0.25
0.1
0.1
Max.
3
1
0.5
1
0.4
100
µA
µA
mA
µA
Ω
mA
Test Conditions
Unit
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)
V
IN
I
K
R1
I
REF
V
REF
V
o
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
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Mar., 2008
3
www.anpec.com.tw
APL1431
Application Circuits
V
IN
R
B
R
1
V
REF
R
2
V
o
V
IN
R
B
C
1
V
REF
R
2
R
1
V
o
Precision Voltage Reference
Precision High-Current Series Regulator
Notes for Application Circuits:
1) For the series regulator applications, add a compensation capacitor C1 between CATHODE and REF is
strongly recommended to improve the stability of output voltage .
2) Set V
O
according to the following equation: V
O
= V
REF
(1+R1/R2)+l
REF
xR1
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 minimum
operating current (0.5mA) at V
IN(MIN)
.
B) The minimum limit for R
B
should be such that the cathode current (l
K
) does not exceed 100mA under all
load conditions, and the instantaneous turn-on value for l
K
does not exceed 120mA.
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Mar., 2008
4
www.anpec.com.tw
APL1431
Typical Characteristics
Reference Input Current vs. Ambient Temperature
1.5
Cathode Current vs. Cathode Voltage
800
V
KA
=V
REF
T
A
=25
o
C
R
1
=10kΩ
R
2
=
∞
I
K
=10mA
600
Reference Input Current (µA)
Cathode Current (µA)
1.25
400
I
K(min)
1
200
0.75
0
0.5
-50
-25
0
25
50
75
100
125
-200
-1
0
1
2
3
Ambient Temperature (°C)
Cathode Voltage (V)
Cathode Current vs. Cathode Voltage
100
V
KA
=V
REF
T
A
=25
o
C
Reference Voltage vs. Ambient Temperature
2.52
2.515
V
KA
=V
REF
I
K
=10mA
Cathode Current (mA)
Reference Voltage (V)
0
1
2
3
50
2.51
2.505
2.5
2.495
2.49
2.485
2.48
2.475
0
-50
-100
-1
2.47
-50
-25
0
25
50
75
100
125
Cathode Voltage (V)
Ambient Temperature (°C)
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Mar., 2008
5
www.anpec.com.tw
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