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 and Green Devices 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
Switching Power Supply
Pin Configuration
ANODE
3
NC
NC
Symbol
REF
1
5
2
1
2
4
3
Anode
Cathode
REF CATHODE
REF ANODE CATHODE
Functional Diagram
Cathode
SOT-23-3 (Top View)
SOT-23-5 (Top View)
3 CATHODE
2 ANODE
1
2
3
REF
+
_
Vref
1 REF
REF
ANODE CATHODE
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.10 - Mar., 2008
1
www.anpec.com.tw
APL431L
Ordering and Marking Information
APL431L
Assembly Material
Handling Code
Temperature Range
Package Code
Elec. Grade
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
Temperature Range
C : 0 to 70
°
C
I : -40 to 85
°
C
Handling Code
TR : Tape & Reel
TB : Tape & Box
Assembly Material
L : Lead Free Device
G : Halogen and Lead Free Device
APL
431L
XXXXX
APL431L A/B : 431L
APL431L E :
APL431L D :
APL431L
XXXXX
XXXXX - Date Code
XXXXX - Date Code
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).
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
Maximum Lead Soldering Temperature, 10 Seconds
Parameter
Rating
21
120
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
SDR
Copyright
©
ANPEC Electronics Corp.
Rev. B.10 - Mar., 2008
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
,
R
1
=10kΩ, R
2
=∞, I
K
=10mA, (Fig. 2)
V
REF
=0V, (Fig. 3)
V
KA
=6V
V
KA
=16V
(Note 1)
V
KA
=V
REF
, I
K
=1mA to 100mA,
f
≤1kHz
(Fig. 1)
Minimum Operating Current V
KA
=V
REF
(Fig. 1)
Note 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.10 - Mar., 2008
3
www.anpec.com.tw
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 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 (80µA) 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 150mA.
Copyright
©
ANPEC Electronics Corp.
Rev. B.10 - Mar., 2008
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.10 - Mar., 2008
5
www.anpec.com.tw
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