LM4040C25FTA datasheet(10/12 Pages) ZETEX

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LM4040C25FTA Datasheet(PDF) 10 Page - Zetex Semiconductors

Part #	LM4040C25FTA

Description	Precision micropower shunt voltage references

Download	12 Pages

Scroll/Zoom	100%

Manufacturer	ZETEX [Zetex Semiconductors]

Direct Link	http://www.diodes.com/

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10 / 12 page

Issue 4 - July 2008

www.zetex.com

www.diodes.com

Application information

In a conventional shunt regulator application, an external series resistor (RS) is

connected between the supply voltage, VS, and the LM4040

RS determines the current that flows through the load (IL) and the LM4040 (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 15 mA.

RS is determined by the supply voltage, (VS), the load and operating current, (IL

and IR), and the LM4040’s reverse breakdown voltage, VR.

Printed circuit board layout considerations

LM4040s in the SOT23 package have the die attached to pin 1, which results in an electrical

contact between pin 2 and pin 3. Therefore, pin 1 of the SOT-23 package must be left floating or

connected to pin 2.

LM4040s in the SC75 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.

IR +

−

Manufacturer	Part #	Datasheet	Description
Zetex Semiconductors	LM4040C25FTA	110Kb / 6P	Precision micropower shunt voltage references
Diodes Incorporated	LM4040C25FTA	494Kb / 12P	PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES

Manufacturer	Part #	Datasheet	Description
Diodes Incorporated	ZXRE330	522Kb / 8P	PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Zetex Semiconductors	LM4040	110Kb / 6P	Precision micropower shunt voltage references
Diodes Incorporated	LM4041DH5TA	177Kb / 7P	PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
	LM4040	494Kb / 12P	PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
	LM4040	452Kb / 10P	PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
	LM4041	177Kb / 7P	PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES
Analog Devices	ADR5043	425Kb / 16P	Precision Micropower Shunt Mode Voltage References REV. B
	ADR5045	425Kb / 16P	Precision Micropower Shunt Mode Voltage References REV. B
	ADR5040ARTZ	557Kb / 16P	Precision Micropower Shunt Mode Voltage References REV. A
	ADR5040	425Kb / 16P	Precision Micropower Shunt Mode Voltage References REV. B

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