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LM4041CQFTA Datasheet(PDF) 5 Page - Diodes Incorporated |
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LM4041CQFTA Datasheet(HTML) 5 Page - Diodes Incorporated |
5 / 7 page LM4041Q Document number: DS37001 Rev. 1 - 2 5 of 7 www.diodes.com March 2014 © Diodes Incorporated LM4041Q A Product Line of Diodes Incorporated Application Information The LM4041Q comes in two variants: LM4041_Q with fixed 1.225V output LM4041DADJQ with variable output voltage. In a conventional shunt reference (2-terminal, fixed output device) application (Figure 1), an external series resistor (RS) is connected between the supply voltage, VS, and the LM4041Q. RS determines the current that flows through the load (IL) and the LM4041Q (IR). Since load current and supply voltage may vary, RS should be small enough to supply at least the minimum acceptable IR to the LM4041Q 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 LM4041Q is less than 12 mA. RS is determined by the supply voltage, (VS), the load and operating current, (IL and IQ), and the LM4041Q’s reverse breakdown voltage, VR. R L R S S I I V V R For the adjustable device 3-terminals are used The LM4041Q-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: 1 2 R O R R 1 V V Printed Circuit Board Layout Considerations LM4041Q with fixed output voltage in the SOT23 package has the die attached to pin 3, which results in an electrical contact between pin 2 and pin 3. Therefore, pin 3 of the SOT23 package must be left floating or connected to pin 2. RS VS IR + IL IR IL VR VO Figure 2 R1 R2 |
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