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PDF LM4041 Data sheet ( Hoja de datos )
| Número de pieza | LM4041 | |
| Descripción | PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES | |
| Fabricantes | Diodes | |
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LM4041
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Description
The LM4041 is a bandgap circuit designed to achieve a
precision micro-power voltage reference of 1.225 V. The
device is available in the small outline SOT23 and SC70-5
surface mount packages which are ideal for applications
where space saving is important.
Both packages are available to 0.5% C grade and 1%
D grade for precision applications. Excellent performance is
maintained over the 60µA to 12mA operating current range
with a typical temperature coefficient of only 20ppm/°C. The
device has been designed to be highly tolerant of capacitive
loads so maintaining excellent stability.
This device offers a pin for pin compatible alternative to the
LM4041 voltage reference in both adjustable and 1.225V
output variants.
Features
• Small packages:
SOT23, SC70-5
• No output capacitor required
• Output voltage tolerance
• LM4041C:
±0.5% at 25°C
• LM4041D:
±1% at 25°C
• Low output noise:
20µVrms
(10Hz to 10kHz)
• Wide operating current range: 60µA to 12mA
• Extended temperature range: -40°C to +125°C
• Low temperature coefficient : 100ppm/°C (max)
• All parts AEC-Q100 Grade1 qualified
Applications
• Battery powered equipment
• Precision power supplies
• Portable instrumentation
• Portable communications devices
• Notebook and palmtop computers
• Data acquisition systems
Pin Assignments
LM4041_F (SOT23)
CATHODE 1
3 N/C
ANODE 2
Pin 3 must left floating or connected to pin 2.
LM4041_ADJF….(SOT23)
REF 1
3 ANODE
CATHODE 2
LM4041_H5 (SC70-5)
ANODE 1
5 N/C
N/C 2
CATHODE 3
4 N/C
Pin 2 must be left floating or connected to pin 1
LM4041_ADJH5 (SC70-5)
N/C 1
ANODE 2
5 REF
CATHODE 3
4 N/C
LM4041
Document number: DS32020 Rev. 8 - 2
1 of 7
www.diodes.com
September 2011
© Diodes Incorporated
1 page  
LM4041
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Application Information
In a conventional shunt regulator application (Figure 1), an
external series resistor (RS) is connected between the
supply voltage, VS, and the LM4041.
VS
IR +
IL
RS IL
VR
IR
VS
IR + IL
RS IL
VO
IR
VR
Figure 1
RS determines the current that flows through the load (IL)
and the LM4041 (IR). Since load current and supply
voltage may vary, RS should be small enough to supply at
least the minimum acceptable IR to the LM4040 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 IL is at its minimum, RS should be
large enough so that the current flowing through the
LM4040 is less than 12 mA.
RS is determined by the supply voltage, (VS), the load and
operating current, (IL and IQ), and the LM4040’s reverse
breakdown voltage, VR.
RS
=
VS
IL
− VR
+ IR
The LM4041 comes in two varients:
• LM4041 with fixed 1.225V output
• LM4041_ADJ with variable output voltage.
Figure 2
The LM4041-ADJ’s output voltage can be adjusted to any
value in the range of 1.24V through 10V. The output
voltage is set by the ratio of two external feedback
resistors as shown in Figure 2 and the internal reference
voltage (VR).
The output voltage is found using the equation:
VO
=
VR
× ⎜⎜⎝⎛1+
R2
R1
⎟⎟⎠⎞
Printed circuit board layout considerations
LM4041 with fixed output voltage in the SOT23 package
has the die attached to pin 1, which results in an electrical
contact between pin 2 and pin 1. Therefore, pin 1 of the
SOT23 package must be left floating or connected to
pin 2.
LM4041 with fixed output voltage in the SC70-5 package
have the die attached to pin 2, which results in an
electrical contact between pin 2 and pin 1. Therefore, pin
2 must be left floating or connected to pin1.
LM4041
Document number: DS32020 Rev. 8 - 2
5 of 7
www.diodes.com
September 2011
© Diodes Incorporated
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet LM4041.PDF ] | |
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