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Voltage Regulators
AN1431T, AN1431M
Variable output shunt regulator
I Overview
The AN1431T and AN1431M are highly accurate stabilized power supplies in which the output voltage can be adjusted in the range from approximately 2.5 to 36V under the operating temperature by using the external resistor. Because of its fast rising characteristic, it can be used as a Zener diode and has the wide application. AN1431T
5.00.2
Unit: mm
4.00.2
(1.0)
5.10.2
2.30.2 0.60.15
(1.0) 13.50.5
I Features
* High precision reference voltage: 2.5V (allowance: 2%) * High temperature stability: 17ppm/C typ. * Output voltage externally adjustable: 2.5 to 36V * Fast rising output * Low input impedance: 0.2 typ. * Low output noise voltage
2.54
0.43+0.1 -0.05
0.43+0.1 -0.05
231
SSIP003-P-0000
AN1431M
4.6 max. 1.8 max.
Unit: mm
1.6 max.
I Block Diagram (AN1431T)
2.6 typ.
Current Source Output Tr Error Amp.
-
Voltage Reference
R VKA = VREF (1 + 1 ) + IREF * R1 R2 R2 = 2.5k
0.48 max. 1.5 3.0
0.58 max. 1.5
0.8 min.
+
4.25 max.
2.6 max.
0.44 max.
1 (3)
IK
3 (2)
2 (1)
IREF VKA VREF
3
2
1
V1 R1 R2
HSIP003-P-0000B Note) The packages (SSIP003-P-0000 and HSIP003P-0000B) of this product will be changed to lead-free type (SSIP003-P-0000S and HSIP003P-0000Q). See the new package dimensions section later of this datasheet.
Note) The number in ( ) shows the pin number for the AN1431M.
I Pin Descriptions
* AN1431T
Pin No. 1 2 3 Cathode Reference pin Anode Description
* AN1431M
Pin No. 1 2 3 Anode Cathode Description Reference pin
Publication date: December 2001
SFF00001CEB
1
AN1431T, AN1431M
I Absolute Maximum Ratings at Ta = 25C
Parameter Supply voltage Supply current Power dissipation Reference input current Operating ambient temperature Storage temperature * AN1431T AN1431M AN1431T AN1431M Symbol VCC ICC PD IREF Topr Tstg Rating 37 -100 to +150 650 * - 0.05 to +10 -20 to +85 -25 to +80 -55 to +150 -55 to +125 Unit V mA mW mA C C
AN1431M is mounted on a standard board (glass epoxy: 20mm x 20mm x t1.7mm with Cu foil of 1cm2 or more).
g g I RecommendedpOperating Range at Ta = 25C
Parameter Supply voltage Symbol VKA Range VREF (2.5 to 36V)
I Electrical Characteristics at Ta = 25C
Parameter Reference voltage Symbol VREF Conditions VKA = VREF, IK = 10mA VKA = VREF, IK = 10mA, Ta = 0 to +70C IK = 10mA, VKA = 10V to VREF IK = 10mA, VKA = 36V to 10V IK = 10mA, R1 = 10k, R2 = IK = 10mA, R1 = 10k, R2 = , Ta = 0 to +70C VKA = VREF *3 VKA = 36V, VREF = 0V VKA = VREF, IK = 1 to 100mA, f 1kHz
IREF IREF(max) IREF(dev) = IREF(max) - IREF(min)
Min 2.45
Typ 2.50 3 -1.2 -1 2 0.4 0.4 0.1 0.2
Max 2.55 17 -2.7 -2 4 1.2 1.0 1.0 0.5
Unit V mV mV/V mV/V A A mA A
Reference voltage change to temperature VREF(Jev) *1, 2 Reference voltage power supply characteristic Reference input current Reference input current change to temperature Minimum cathode current Off-state cathode current Dynamic impedance VREF VKA IREF IREF(dev) *2 Imin IOFF ZKA
*1
VREF VREF(max)
VREF(dev) = VREF(max) - VREF(min)
VREF(dev) VREF(min) Ta IREF(min) Ta
IREF(dev)
The temperature coefficient aVREF for the reference input voltage is equivalently given by the following expression. VREF(dev) aVREF = VREF x 106 (ppm/C) VREF at Ta = 25C Ta For example, assuming VREF(max) = 2500mV (Ta = 30C), VREF(min) = 2497mV (Ta = 0C), (VREF(dev) = 3mV) and VREF = 2499mV (Ta = 25C) Ta = 70C 3mV then, aVREF = 2499mV x 106 = 17.1 (ppm/C) 70C *2 These values are design reference values, not guaranteed ones. *3 The dynamic impedance is defined by the following expression. ZKA = VKA IK The total dynamic impedance at VREF , VKA , IREF and IREF(dev) is as follows. V R Z = = ZKA (1 + 1 ) I R2
SFF00001CEB
2
AN1431T, AN1431M
I Main Characteristics PD Ta
1000 (1) AN1431T Rth(j-a) = 190C/W (max.) 900 (2) AN1431M Mounted on a standard board 800 (glass epoxy: 20mm x 20mm x t1.7mm with Cu foil of 1cm2 or more) 700 600 500 (1) 400 (2) 300 200 100 0 0 20 40 60 80 100 120 140 160 2700 2650 2600 2550 2500 2450 2400 2350 -50 -25
VREF Ta
Reference input current IREF (A)
VK = VREF IK = 10mA 4
IREF Ta
IK = 10mA R1 = 10k R2 = 3
Reference voltage VREF (mV)
Power dissipation PD (mW)
2
1
0
25
50
75
100 125
-40 -20
0
20
40
60
80
100
Ambient temperature Ta (C)
Ambient temperature Ta (C)
Ambient temperature Ta (C)
I Application Circuit Examples
1. Shunt regulator
+V VO
2. Constant current power supply
+V IO
3. Constant current source
+V
R1 VREF R2
K K
AN1431T/M AN1431T/M
A A VREF RS
K
AN1431T/M
A
VREF RS
VO = 1 +
R1 V R2 REF
IO =
VREF RS
IO =
VREF RS
IO
4. Current bootstrap
+V VO
5. Adjustable output regulator combined with 3-pin regulator
+V
VO
AN7805
R1 K CI VREF R2 R1
K
AN1431T/M
A
VREF
CO
AN1431T/M
A
R2
VO = 1 +
R1 V R2 REF
VO = VREF 1 +
R1 , VO(min) = VREF + 5V R2
SFF00001CEB
3
AN1431T, AN1431M
I New Package Dimensions (Unit: mm)
* SSIP003-P-0000S (Lead-free package)
5.000.20 4.000.20
(1.00)
(1.00)
0.600.15 0.400.10
13.300.50
5.000.20
2.300.20 0.40+0.10 -0.05
1 1.27
3 1.27
* HSIP003-P-0000Q (Lead-free package)
4.500.10 1.550.20
2.500.10
4.00+0.25 -0.20
1 0.40+0.10 -0.05 1.50
3 0.40+0.10 -0.05 0.50+0.10 -0.05 3.00 (0.75)
1.00+0.10 -0.20
0.15 M
0.42+0.10 -0.05
1.500.10
0.10
(0.40)
4
SFF00001CEB
2.650.10
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2001 MAR

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