IRU431LCL5TRPBF [INFINEON]
Two Terminal Voltage Reference, 1 Output, 1.24V, Trim/Adjustable, PDSO5, LEAD FREE, SOT-23, 5 PIN;
| 型号： | IRU431LCL5TRPBF |
| 厂家： | 
Infineon |
| 描述： | Two Terminal Voltage Reference, 1 Output, 1.24V, Trim/Adjustable, PDSO5, LEAD FREE, SOT-23, 5 PIN 光电二极管 输出元件 |
| 文件： | 总9页 (文件大小：88K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Data Sheet No. PD94118
IRU431L
LOW -VOLTAGE ADJUSTABLE PRECISION
SHUNT REGULATOR
FEATURES
DESCRIPTION
The IRU431L is a three-terminal adjustable shunt regu-
SOT-23 Packages
Voltage Reference Initial Accuracy (1%)
Low Operating Cathode Current (80µA max)
Unconditionally Stable with only 1µF
Adjustable Output from 1.24V to 15V
0.25Ω Typical Output Impedance
lator that can also be used as a precision voltage refer-
ence. Its output voltage may be set to any value be-
tween VREF(1.24V) and 15V with two external resistors
as shown in the typical application circuit. Other appli-
cations of this device include being used as a merged
amplifier and reference in applications such as a linear
regulator or as the secondary side controller in low volt-
age power supply applications. The IRU431L only re-
quires 80µA maximum quiescent current before regu-
lating, making it ideal as an efficient voltage reference
for battery type applications. The IRU431L has ±1%
initial accuracy.
Pin to Pin Compatible with TLV431
APPLICATIONS
Precision Voltage Reference
Linear Regulator Controller
Secondary Side Controller for the low voltage
power supply applications
TYPICAL APPLICATION
RB
VIN
VOUT
R1
K (Cathode)
Ref
VREF
IRU431L
CO
A (Anode)
R2
R1
R2
Vo = VREF × 1 +
( )
Figure 1 - Typical application of the IRU431L as a shunt regulator / voltage reference.
PACKAGE ORDER INFORMATION
TA (°C)
3-PIN SOT-23 (L3)
5-PIN SOT-23 (L5)
0 To 70
IRU431LCL3
IRU431LCL5
Rev. 2.0
08/05/03
www.irf.com
1
IRU431L
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) .................................................... 15V
Continuous Cathode Current Range .......................... -15mA to +15mA
Reference Current Range .......................................... -0.05mA to 15mA
Storage Temperature Range ...................................... -658C to 1508C
Operating Junction Temperature Range .....................
08C to 1508C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device.
PACKAGE INFORMATION
3-PIN SOT-23 (L3)
5-PIN SOT-23 (L5)
TOP VIEW
TOP VIEW
2
1
Cathode
NC
NC
1
2
3
5
Anode
Anode
3
Ref
Cathode
4
Ref
qJA=336°C/W
qJA=256°C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over TA=0 to 708C, Co=1µF. Typical values refer to TA=258C.
Low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient tempera-
ture.
PARAMETER
SYM
TEST CONDITION
MIN
TYP
MAX UNITS
Reference Voltage
IRU431L
VREF
IK=10mA, VKA=VREF, TA=258C
IK=10mA, VKA=VREF
VKA=VREF, IK=10mA
1.228 1.240 1.252
1.221 1.240 1.259
6
V
VREF(DEV)
mV
VREF Deviation over full
temperature range
Ratio of VREF change to
cathode voltage change
Reference Pin Current
IREF Deviation over full
temperature range
∆VREF/∆VKA IK=10mA, ∆VKA=VREF to 6V
IK=10mA, R1=10KΩ, R2=open
-1
-6
1
mV/V
0.15
0.05
µA
µA
IREF(DEV)
IK=10mA, R1=10KΩ, R2=open
Minimum Cathode Current
Off State Cathode Current
IK(MIN)
Ioff
VKA=VREF
55
0.6
1.8
3.2
0.25
80
0.75
5
µA
µA
VKA=6V, VREF=0V
VKA=10V, VREF=0V
VKA=15V, VREF=0V
VKA=VREF, f<1KHz,
IK=0.1 to 15mA, Note 1
10
0.4
Dynamic Impedance
ZKA0
Ω
Note 1: The dynamic impedance when VKA=VREF is de- When the device is operating with two external resistors
fined as:
(See Figure 3), the total dynamic impedance of the cir-
cuit is given by:
∆VKA
∆IK
?ZKA0? =
∆V
∆I
R1
R2
?ZKA? =
= ?ZKA0? × 1 +
( )
Rev. 2.0
08/05/03
www.irf.com
2
IRU431L
The deviation parameters, VREF(DEV) and IREF(DEV) are de- Where:
fined as the differences between the maximum and the ?αVREF? unit is ppm/8C
minimum values obtained over the rated temperature ∆TA is the rated operating free air temperature of the
range. The average full range temperature coefficient of device.
the reference input voltage is defined as:
αVREF can be positive or negative depending on whether
minimum VREF or maximum VREF respectively occurs at
the lower temperature.
VREF(DEV)
(VREF(258C) )
× 106
?αVREF? =
∆TA
PIN DESCRIPTIONS
5-PIN
3-PIN
PIN SYMBOL
PIN DESCRIPTION
4
1
Ref
Resistors from the Ref pin to the Cathode pin and to ground form a divider
that sets the output voltage.
3
5
2
3
Cathode
Anode
The output of the shunt regulator. A capacitor of 1µF minimum value must
be connected from this pin to Anode pin to insure unconditional stability.
Ground pin. This pin must be connected to the lowest potential in the
system and all other pins must be at higher potential with respect to this
pin.
1, 2
NA
NC
These pins are not connected internally.
BLOCK DIAGRAM
Cathode
Ref
+
1.24V
Anode
Figure 2 - Simplified block diagram of the IRU431L.
Rev. 2.0
08/05/03
www.irf.com
3
IRU431L
APPLICATION INFORMATION
Output Voltage Setting
The IRU431L can be programmed to any voltages in the An example is given below on how to properly select the
range of 1.24 to 15V with the addition of R1 and R2 biasing resistor.
external resistors according to the following formula:
Assuming:
R1
R2
VMIN = 4.5V
VMAX = 6V
VKA = 3.3V
IL = 10mA
Vo = VKA = VREF × 1 +
+ IREF × R1
( )
The IRU431L keeps a constant voltage of 1.240V be-
tween the Ref pin and Ground pin. By placing a resistor
R2 across these two pins a constant current flows The maximum value for the biasing resistor is calcu-
through R2, adding to the IREF current and into the R1 lated using the following equations:
resistor producing a voltage equal to:
VMIN - VKA
IB(MAX) + IL(MAX)
RB(MAX) =
1.240
× R1 + IREF × R1
( R2 )
IB(MAX) = IK(MIN) + IR
which will be added to the 1.240V to set the output volt-
age as shown in the above equation. Since the input
bias current of the Ref pin is 0.5µA max, it adds a very
small error to the output voltage and for most applica-
tions can be ignored. For example, in a typical 5V to
3.3V application where R2=1.21KΩ and R1=2KΩ the
error due to the IADJ is only 1mV which is about 0.03% of
the nominal set point.
Where:
VMIN = Minimum supply voltage
IL(MAX) = Maximum load current
IB(MAX) = Maximum bias current
IK(MIN) = Maximum value for the minimum
cathode current spec
IR = Current through R1
Assuming R1 = 2KΩ as before,
RB
V
IN
VKA = VOUT
3.3 - 1.24
IK
IL
IR =
= 1.03mA
R1
R2
2
IRU431L
Co
RL
IB(MAX) = 0.08 + 1.03 = 1.11mA
4.5 - 3.3
RB(MAX) =
= 108Ω
1.11 +10
Select RB = 100Ω
Figure 3 - Typical application of the IRU431L
for programming the output voltage.
The maximum power dissipation of the resistor is calcu-
lated under the maximum supply voltage as follows:
Biasing Resistor (RB) Selection
(VMAX - VKA)2
The biasing resistor RB is selected such that it does not
limit the input current under the minimum input supply
and maximum load and biasing current.
PRB(MAX) =
RB
Where:
VMAX = Maximum supply voltage
PRB(MAX) = Maximum RB power dissipation
(6 - 3.3)2
100
PRB(MAX) =
= 73mW
Rev. 2.0
08/05/03
www.irf.com
4
IRU431L
Thermal Design
Stability
The IRU431L is offered in the surface mount SOT-23 (L) The IRU431L has many different domains of stability as
packages. The SOT-23 package has the maximum power a function of the cathode current. As is typical of three-
dissipation capability of 150mW at TA=25°C with the de- terminal shunt regulators, the IRU431L has many do-
rating factor of -1.2mW / °C.
mains of stability. The actual domain in which any prac-
tical circuit operates is related to cathode current. In
The table below summarizes the maximum power dissi- general the device will be unconditionally stable for any
pation capability of each package versus ambient tem- cathode current if a capacitor, 1µF or larger, is connected
perature.
between the cathode and the anode. If the cathode cur-
rent is always higher than 3mA under minimum line and
maximum load conditions, the capacitor value can be
reduced to 0.01µF and the system will be stable.
Ambient Temperature (TA) 8C
Pkg
25
40
50
60
70
SOT-23
150mW 132mW 120mW
108mW
96mW
In our previous example, the maximum power dissipa-
tion of the device is calculated under no load and maxi-
mum input supply condition.
The maximum power is calculated using the following
equation:
VMAX - VKA
PMAX = VKA ×
( )
RB
Where:
PMAX = Maximum power dissipation of the IRU431L
For our example:
6 - 3.3
PMAX = 3.3 ×
= 89mW
( 100 )
As shown in the power dissipation table, both packages
can handle this power dissipation.
Rev. 2.0
08/05/03
www.irf.com
5
IRU431L
TYPICAL APPLICATION
Q1
V
IN
V
OUT
C1
C2
R4
R1
R2
R3
12V
U1
Figure 4 - Low cost 3.3V to 2.7V output.
Ref Desig
Description
Qty
Part #
Manuf
IR
U1
C1, C2
R1
R2
R3, R4
HS1
Shunt Regulator
Capacitor
Resistor
Resistor
Resistor
1
2
1
1
2
IRU431L
Elect, 220µF, 6.3V, ECAOJFQ221 Panasonic
6.2KΩ, 5%, SMT
118Ω, 1%, SMT
100Ω, 1%, SMT
Use minimum of 1" square copper pad
area for load current <4A
Heat Sink
IR WORLD HEADQUARTERS:233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7903
Visit us at www.irf.com for sales contact information
Data and specifications subject to change without notice. 02/01
Rev. 2.0
08/05/03
www.irf.com
6
IRU431L
(L3) SOT-23 Package
3-Pin
D
e1
S
C
e
L
E
H
B
A
C
L
A1
SYMBOL
MIN
MAX
A
A1
B
0.890 1.120
0.013 0.100
0.370 0.510
0.085 0.180
2.800 3.040
1.200 1.400
0.890 1.030
1.780 2.050
C
D
E
e
e1
H
L
2.100 2.640
0.55 REF
S
0.450 0.600
NOTE: ALL MEASUREMENTS
ARE IN MILLIMETERS.
Rev. 2.0
08/05/03
www.irf.com
7
IRU431L
(L5) SOT-23 Package
5-Pin
B
e
L
E
E1
e1
D
α
C
A2
A
A1
C
L
SYMBOL
MIN
0.90
0.00
0.90
0.25
0.09
2.80
2.60
1.50
MAX
1.45
0.15
1.30
0.50
0.20
3.00
3.00
1.75
A
A1
A2
B
C
D
E
E1
e
0.95 REF
1.90 REF
e1
L
0.35
08
0.55
α
108
NOTE: ALL MEASUREMENTS
ARE IN MILLIMETERS.
Rev. 2.0
08/05/03
www.irf.com
8
IRU431L
PACKAGE SHIPMENT METHOD
PKG
PACKAGE
PIN
PARTS
PARTS
T & R
DESIG
DESCRIPTION
COUNT
PER TUBE
PER REEL
Orientation
L3
L5
SOT-23
SOT-23
3
5
---
---
3000
3000
Fig A
Fig B
1
1
1
1
1
1
Feed Direction
Figure A
Feed Direction
Figure B
IR WORLD HEADQUARTERS:233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7903
Visit us at www.irf.com for sales contact information
Data and specifications subject to change without notice. 02/01
Rev. 2.0
08/05/03
www.irf.com
9
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