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LExxC - LExxAB LExxC Very low drop voltage regulators with...

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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 μA 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 μF 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, it’s 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 μF 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
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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
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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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Figure 5. Dropout voltage vs temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Figure 6. Supply current vs temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Figure 7. Supply current vs input voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Figure 8. Short circuit current vs dropout voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Figure 9. S.V.R. vs frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Figure 10. Logic controlled precision 3.3/5.0 V selectable output . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Figure 11. Sequential multi-output supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Figure 12. Multiple supply with ON/OFF toggle switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Figure 13. Basic inhibit functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
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List of tables LExxAB LExxC 4/40 List of tables Table 1. Device summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 4. Electrical characteristics for LE12AB (refer to the test circuits, T J = 25°C, C I = 0.1 μF, C O = 2.2 μF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 5. Electrical characteristics for LE12C (refer to the test circuits, T J = 25°C, C I = 0.1 μF, C O = 2.2 μF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 6. Electrical characteristics for LE25AB (refer to the test circuits, T J = 25°C, C I = 0.1 μF, C O = 2.2 μF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 7. Electrical characteristics for LE25C (refer to the test circuits, T J = 25°C, C I = 0.1 μF, C O = 2.2 μF unless otherwise specified.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 8.
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