LM4041DFTA Diodes Zetex, LM4041DFTA Datasheet - Page 5

• Manufacturer Part Number: LM4041DFTA
• Description: IC VOLTAGE REF 1.225V 1% SOT23-3
• Manufacturer: Diodes Zetex

Specifications of LM4041DFTA

• Reference Type: Shunt
• Voltage - Output: 1.225V
• Tolerance: ±1%
• Temperature Coefficient: 150ppm/°C
• Number Of Channels: 1
• Current - Cathode: 65µA
• Current - Output: 12mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-3, TO-236-3, Micro3™, SSD3, SST3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -
• Current - Quiescent: -
• Other names: LM4041DFTR

Application Information
In a conventional shunt regulator application (Figure 1), an
external series resistor (R
supply voltage, V
R
and the LM4041 (I
voltage may vary, R
least the minimum acceptable I
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
large enough so that the current flowing through the
LM4040 is less than 12 mA.
R
operating current, (I
breakdown voltage, V
The LM4041 comes in two varients:
LM4041
Document number:
S
S
is determined by the supply voltage, (V
determines the current that flows through the load (I
•
•
R
LM4041 with fixed 1.225V output
LM4041_ADJ with variable output voltage.
R
S
I
Figure 1
R
S
V
=
S
DS32020 Rev. 7 - 2
V
I
I
I
S
R
L
S
L
, and the LM4041.
I
+
+
−
L
S
L
V
R
I
R
V
R
should be small enough to supply at
). Since load current and supply
and I
.
R
R
L
is at its minimum, R
S
Q
) is connected between the
), and the LM4040’s reverse
R
to the LM4040 even
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
S
), the load and
S
should be
www.diodes.com
L
)
5 of 7
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 (V
The output voltage is found using the equation:
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.
Printed circuit board layout considerations
R
).
R
I
S
R
Figure 2
V
V
O
S
I
=
R
V
V
I
+ I
L
R
R
×
L
⎛
⎜ ⎜
⎝
1
+
R
V
R
2
1
O
⎞
⎟ ⎟
⎠
LM4041
© Diodes Incorporated
December 2010