APL431L
Low Voltage Adjustable Precision Shunt Regulator
Features
•
•
•
•
•
•
•
•
Precise Reference Voltage to 1.24V
Guaranteed 0.5%, 1% or 1.5% 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.
Output voltage may be set to any value between
V
ref
(1.24 V) and 20 V with two external resistors
(see Figure 2). When used with an photocoupler,
the APL431L is an ideal voltage reference in isolated
feedback circuits for 3V to 12V switching-mode
power supplies. This device has a typical output
impedance of 0.1W. Active output circuitry provides
a very sharp turn-on characteristic, making the
APL431L excellent replacements for zener diodes
in many applications, including on-board regulation
and adjustable power supplies.
Applications
•
•
•
Linear Regulators
Adjustable Power Supply
ANODE
NC
NC
Pinouts
Switching Power Supply
3
5
2
1
2
4
3
1
Symbol
REF
Anode
Cathode
REF CATHODE
REF ANODE CATHODE
SOT-23-3 (Top View)
SOT-23-5 (Top View)
Functional Diagram
Cathode
3 CATHODE
2 ANODE
1 REF
REF
ANODE CATHODE
1
2
3
REF
+
_
Vref
TO-92 (Top View)
SOT-89 (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. B.9 - Apr., 2007
1
www.anpec.com.tw
APL431L
Ordering and Marking Information
Elec. Grade
A : 0.5% Reference Voltage Tolerance
B : 1% Reference Voltage Tolerance
C : 1.5% Reference Voltage Tolerance
Package Code
A : SOT-23-3
B : SOT-23-5
D : SOT-89
E : TO-92
Y:Chip Form
Temp. Range
C : 0 to 70
°
C
I : -40 to 85
°
C
Handling Code
PB : Plastic Bag
TB : Tape & Box
TR : Tape & Reel
Lead Free Code
L : Lead Free Device Blank : Original Device
APL
431L
XXXXX
APL431L
Lead Free Code
Handling Code
Temp. Range
Package Code
Elec. Grade
APL431L A/B : 431L
APL431L E :
APL431L D :
APL431L
XXXXX
XXXX - Date Code
X
XXXXX - Date Code
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 soldering
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
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)
Parameter
Rating
20
100
3
416
357
250
250
-40 to 150
-65 to 150
260
Unit
V
mA
mA
θ
JA
°C/W
°C
°C
°C
T
J
T
STG
T
SOL
Copyright
©
ANPEC Electronics Corp.
Rev. B.9 - Apr., 2007
2
www.anpec.com.tw
APL431L
Electrical Characteristics
Symbol
Parameter
T
A
= 25°C ( unless otherwise noted)
APL431L
Min.
1.234
1.228
1.223
1.222
1.215
1.212
Typ.
1.240
1.240
1.240
1.240
1.240
1.240
5
-0.2
0.15
0.05
0.01
0.01
0.1
80
Max.
1.246
1.252
1.258
1.258
1.265
1.262
15
-1.0
0.5
0.3
0.1
0.5
0.4
100
mV
mV/V
µA
µA
µA
Ω
µA
V
Test Conditions
APL431LA
V
KA
=V
REF
, I
K
=10mA
T
A
=25°C, (Fig. 1)
APL431LB
APL431LC
APL431LA
T
A
=full range
(see Note1), (Fig.1)
APL431LB
APL431LC
Unit
V
REF
Reference Voltage
V
DEF
V
DEF
Temp Deviation
T
A
=full range (see Note1)
V
KA
=V
REF
, I
K
=10mA (Fig. 1)
∆V
REF
/ Ratio of Change in V
REF
to
I
K
=10mA, V
KA
=16V to V
REF
(Fig. 2)
∆V
KA
Change in Cathods Votage
I
REF
I
K
=10mA,R
1
=10kΩ,R
2
=∞ (Fig. 2)
Reference Input Current
I
REF(DEV)
I
REF
Temp Deviation
I
K(off)
Z
KA
I
K(MIN)
off-state cathode current
Dynamic Output Impedance
T
K
=full range (see Note 1),
R
1
=10kΩ, R
2
=∞, I
K
=10mA, (Fig. 2)
V
REF
=0V, (Fig. 3)
V
K
=6V
V
K
=16V
V
KA
=V
REF
, I
K
=1mA to 100mA,
f
≤1kHz
(Fig. 1)
Minimum Operating Current V
KA
=V
REF
(Fig. 1)
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 2. Test Circuit for I
K(off)
Copyright
©
ANPEC Electronics Corp.
Rev. B.9 - Apr., 2007
3
www.anpec.com.tw
Figure 2. Test Circuit for V
KA
>V
REF
,
APL431L
Test Figures (Cont.)
V
IN
I
K
R1
I
REF
V
REF
V
o
R2
Figure 3. Test Circuit for V
KA
>V
REF
,
V
O
= V
KA
= V
REF
×
(1+R
1
/R
2
) + I
REF
×
R
1
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 VOUT according to the following equation: VO = VREF(1+R1/R2)+lREF R1
3) Choose the value for RB as follows:
A) The maximum limit for RB should be such that the cathode current(lK) is greater than the minimum
operating current (80µA) at VIN(MIN).
B) The minimum limit for RB should be such that the cathode current (lK) does not exceed 100mA under all
load conditions, and the instantaneous turn-on value for lK does not exceed 150mA.
Copyright
©
ANPEC Electronics Corp.
Rev. B.9 - Apr., 2007
4
www.anpec.com.tw
APL431L
Typical Characteristics
Cathode Current vs. Cathode Voltage
250
200
Cathode Current vs. Cathode Voltage
100
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.9 - Apr., 2007
5
www.anpec.com.tw
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