AS4041
Precision Micropower 1.24V Shunt Voltage Reference
FEATURES
APPLICATIONS
•
Low temperature coefficient 50 ppm/°C
•
Operating current range 100µA to 15 mA
•
Low power, 250 mW @ I
IN
=100 mA
•
Two terminal "Zener" operation
•
Small package: SOT - 23, TO-92, and SO-8
•
Fixed reverse breakdown voltage 2.5 Volt
•
No output capacitance required
•
Output voltage tolerance
±
0.5%
•
Constant Current Source
•
Digital Voltmeter
•
Power Supply Monitor
•
Precision Regulators
•
Battery-Powered Equipment
•
Instrumentation
•
Automotive Electronics
•
Data Acquisition Systems
•
Energy Management
PRODUCT DESCRIPTION
The AS4041 is a two-terminal, temperature compensated, band-gap voltage reference, which provides a fixed 1.24V output for input
currents between 500
µA
to 5mA. The bandgap voltage (1.24V) is independently laser trimmed from the output voltage to achieve a
very low tempco, then the output voltage is laser trimmed to 1.24 volts. This trimming technique and the low tempco (A grade 50
ppm/
°C)
thin film resistor process gives a very stable device over the full temperature range. The AS4041 is available in the sub-
miniature (3mm
×
1.3mm) SOT-23, SO-8 surface mount package, or TO-92 package. The operating temperature is -40°C to 85°C.
The ALPHA Semiconductor AS4041 advanced design eliminates the need for an external stabilized capacitor while insuring stability
with any capacitive load, making them easy to use.
ORDERING INFORMATION
Part Number
Package Type
Y=
Tempco
A=100ppm/°C
B=150ppm/°C
X=
Output Accuracy
2=1%
3=2%
AS4041YN-X
TO-92
AS4041YS-X
SO-8
AS4041YM-X
SOT-23
1. For lower Tempco, consult factory
PIN CONNECTIONS
8-Pin Surface Mount (S)
N/C
N/C
N/C
-
1
2
3
4
8
7
6
5
+
N/C
N/C
N/C
-
3
SOT-23-3 (M)
2
1
TO-92 (N)
1
2
3
+
Bottom View
Top View
Top View
Rev. 10/11/00
AS4041
ABSOLUTE MAXIMUM RATINGS
Reverse Current................................................................20mA
Forward Current ...............................................................10mA
Storage Temperature ...................................... -65°C to +150°C
Lead Temperature (Soldering) ........................................ 300°C
Power Dissipation at 25°C
M Package ...................................................... 300mW
N Package ....................................................... 550mW
S Package........................................................ 525mW
Temperature Range ................................... -40°C
≤
T
A
≤
+85°C
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
IN
= 1000µA, and T
A
= +25°C unless otherwise noted. .
Boldface limits apply over temperature.
AS4041A-2
AS4041B-2
Units
Parameters
Conditions
Min
Typ
Max
Min
Typ
Max
Reverse Breakdown
Voltage
Reverse Breakdown
Tolerance
Output Impedance
Noise Voltage
Tempco
Turn-on Setting
Operating Current
Range
Temp. Range
I
R
=500
µA
I
R
=500
µA
0.60
15
30
0.5
-40
5
15
85
0.5
-40
1.24
±25
±49
2
50
30
5
15
85
1.24
±25
±49
2
100
V
mV
mV
Ω
µV
p-p
ppm/°C
µSec
mA
°C
0.1kHz≤f
≤10Hz
Note 1
0.1% of V
OUT
Note 2
0.60
15
Parameters
Reverse Breakdown
Voltage
Reverse Breakdown
Tolerance
Output Impedance
Noise Voltage
Tempco
Turn-on Setting
Operating Current
Range
Temp. Range
Conditions
I
R
=500
µA
I
R
=500
µA
AS4041A-3
Min
Typ
Max
1.24
±50
±74
2
50
30
0.1
-40
5
15
85
AS4041B-3
Min
Typ
Max
1.24
±50
±74
2
100
30
0.1
-40
5
15
85
Units
V
mV
mV
Ω
µV
p-p
ppm/°C
µSec
mA
°C
0.1kHz≤f
≤10Hz
Note 1
0.1% of V
OUT
Note 2
0.60
15
0.60
15
Rev. 10/11/00
AS4041
Note:
1) Three-point measurement guarantees the error band over the specified temperature range.
2) Optimum performance is obtained at currents below 1000
µA.
3) Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation using statistical quality
control.
AS4041 Applications Hints
This device is designed for stable operation and has no need
of an external capacitor between pin 4 and 8. The reference
remains stable if a bypass capacitor is used.
SOT-23
The AS4041 in the SOT-23 package has a parasitic Schottky
diode between pin 3 and pin 1. Pin 1 of SOT-23 must float
or be connected to pin 3.
Conventional Shunt Regulator
In a conventional shunt regulator application (see Figure 1),
an external series resister (R
S
) is connected between the
supply voltage and the AS4041. R
S
determines the current
that flows through the load (I
L
) and the reference(I
Q
). Since
load current and supply voltage may vary, R
S
should be small
enough to supply at least the minimum acceptable I
Q
to the
reference even when the supply voltage is at its minimum and
the load current is at its maximum value. When the supply
voltage is at its maximum and I
L
is at its minimum, R
S
should
be large enough so that the current flowing through the
AS4041-x.x is less than 15mA
R
S
is determined by the supply voltage (V
S
), the load and
operating current (I
L
and I
Q
), reference’s reverse breakdown
voltage (V
R
).
Figure 1. AS4041 Fixed
Shunt Regulator Application
V
S
R
S
V
R
I
O
+ I
L
I
L
I
Q
V
O
AS4041
R
S
= (V
S
- V
R
)/(I
L
+I
Q
)
Rev. 10/11/00
AS4041
DRAWING PACKAGE
8-PIN SOIC (S)
4.0 (0.158)
3.8 (0.150)
5.2 (0.205)
4.6 (0.181)
6.2 (0.244)
5.8 (0.228)
Pin 1
1.27 (0.50)
BSC
1.75 (0.069)
1.35 (0.053)
0.78 (0.031)
0.61 (0.024)
5.0 (0.197)
4.8 (0.188)
0.37 (0.015)
BSC
45
°
0.77 (0.030)
0.64 (0.025)
7
°
(4 PLCS)
3
°
-6°
0.56 (0.022)
0.49 (0.019)
0.45 (0.018)
0.35 (0.014)
0.20 (0.008)
0.10 (0.004)
0.22 (0.009)
0.19 (0.007)
7
°
(4 PLCS)
Rev. 10/4/00
AS4041
DRAWING PACKAGE
SOT-23-3L (M)
0.015 - 0.018
(0.381 - 0.457)
0.047 - 0.055 0.083 - 0.098
(1.194 - 1.397) (2.108 - 2.489)
0.035 - 0.040
(0.889 - 1.016)
0.020 - 0.024
(0.508 - 0.610)
0.070 - 0.080
(1.778 - 2.032)
0.110 - 0.120
(2.794 - 3.048)
0.003 - 0.005
(0.076 - 0.127)
0.001 - 0.004
(0.025 - 0.102)
0.030 - 0.041
(0.762 - 1.041)
0.018 - 0.024
(0.457 - 0.610)
Rev. 10/4/00
NXP MCU
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