LExxC

LExxC - November 2007 Rev 10 1/40 40 LExxAB LExxC Very low...

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Unformatted text preview: November 2007 Rev 10 1/40 40 LExxAB LExxC Very low drop voltage regulators with inhibit Features Very low dropout voltage (0.2 V typ) Very low quiescent current (typ. 50 A in OFF MODE, 0.5 mA in ON MODE, no load) Output current up to 100 mA Output voltages of 1.25; 2.5; 2.7; 3; 3.3; 3.5; 4; 4.5; 4.7; 5; 5.5; 8 V Internal current and thermal limit Only 2.2 F for stability Available in 1% (A) or 2% (C) selection at 25 C Supply voltage rejection: 80db (typ.) Temperature range: -40 to 125 C Description The LExxAB and LExxC are very low drop voltage regulators available in SO-8 and TO-92 packages and in a wide range of output voltages. The very low drop voltage (0.2 V) and the very low quiescent current make them particularly suitable for low noise low power applications and specially in battery powered systems. They are pin to pin compatible with the older L78Lxx series. Furthermore in the 8 pin configuration (SO-8) they employ a shutdown logic control (pin 5, TTL compatible). This means that when the device is used as a local regulator, its possible to put in stand by a part of the board even more decreasing the total power consumption. In the three terminal configuration (TO-92) the device is even in ON STATE, maintaining the same electrical performances. It needs only 2.2 F capacitor for stability allowing room and cost saving effect. SO-8 TO-92 Table 1. Device summary Part numbers LE12C LE35C LE50C LE25AB LE35AB LE50AB LE27AB LE40C LE55C LE30C LE45C LE80C LE33C LE45AB LE80AB LE33AB LE47AB www.st.com Contents LExxAB LExxC 2/40 Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 7 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 LExxAB LExxC List of figures 3/40 List of figures Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 2. Pin connections (top view for SO-8, bottom view for TO-92) . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 3. Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 4. Dropout voltage vs output current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30Dropout voltage vs output current....
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This note was uploaded on 02/08/2011 for the course EE 459L taught by Professor Weber during the Spring '11 term at USC.

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LExxC - November 2007 Rev 10 1/40 40 LExxAB LExxC Very low...

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