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L4949ED-E L4949EP-E

L4949ED-E L4949EP-E
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L4949ED-E L4949EP-E Automotive multifunction very low drop voltage regulator Datasheet - production data Description The L4949ED-E and L4949EP-E are monolithic integrated 5V voltage regulators with a very low dropout output and additional functions as poweron reset and input voltage sense. They are designed for supplying the microcomputer controlled systems especially in automotive applications. Features  AEC-Q100 qualified  ECOPACK®: lead free and RoHS compliant  Operating DC supply voltage range 5 V - 28 V  Transient supply voltage up to 40 V  Extremely low quiescent current in standby  High precision standby output voltage 5V±1%  Output current capability up to 100 mA  Very low dropout voltage less than 0.5 V  Reset circuit sensing the output voltage  Programmable reset pulse delay with external capacitor  Voltage sense comparator  Thermal shutdown and short circuit protections Table 1. Device summary Order codes Package Tube September 2018 This is information on a product in full production.

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Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Supply voltage transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Package and packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.1 4.2

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List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Pin definitions and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

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List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Configuration diagram (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Foldback characteristic of VO . . . . . . . . . . . . . . . . . . . . . . . . . . ....

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Block diagram and pin description Block diagram and pin description Figure 1. Block diagram The block diagram illustrates only a major internal device functionality and it is not intended to mimic any details of hardware design Figure 2. Configuration diagram (top view)

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Block diagram and pin description L4949ED-E, L4949EP-E Table 2. Pin definitions and functions Input supply voltage. Block to GND via an external capacitor (see Figure 3). Sense input pin to supervise input voltage. Connect via an external voltage divider connected to VS and to GND. Preregulator output voltage. For details, see Section 3.4: Preregulator. Reset pulse delay adjustment. Connecting this pin via a capacitor to GND Ground reference Reset output. It is pulled down when the output voltage goes below VRT. Sense output. This open collector pin must be connected to VOUT via an external...

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Electrical specifications Electrical specifications Absolute maximum ratings Table 3. Absolute maximum ratings Symbol DC operating supply voltage Transient supply voltage (T < 1s) Output current Internally limited Output voltage VRES, VSO Output voltage Output current Reset delay voltage Sense input voltage Preregulator output voltage Preregulator output current Junction temperature Storage temperature range The circuit is ESD protected according to MIL-STD-883C. Thermal data Table 4. Thermal data Symbol Thermal Resistance Junction-ambient (max) Thermal Shutdown Junction temperature Thermal...

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Electrical specifications Electrical characteristics VS = 14 V; -40 °C < Tj < 125 °C unless otherwise specified Table 5. Electrical characteristics Symbol Test condition Output voltage Output voltage Output voltage Dropout voltage Input to output voltage difference in undervoltage VIN = 4 V, IO = 35 mA condition Line regulation Load regulation Current limit ILIM IQSE Quiescent current Quiescent current 1. With this test we guarantee that with no output current the output voltage will not exceed 5.5V 2. Foldback characteristic Table 6. Reset Symbol Reset threshold voltage Test condition...

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Electrical specifications Table 7. Sense Test condition Sense threshold hysteresis Sense output low voltage Sense output leakage Sense input current Table 8. Preregulator Symbol Preregulator output voltage Test condition Preregulator output current

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Application information Application information Figure 3. Application circuit For stability: CS 1µF, CO 4.7µF, ESR < 10 at 10KHz. Recommended for application: CS = CO = 10 µF to 100 µF Supply voltage transient High supply voltage transients can cause a reset output signal disturbance. For supply voltages greater than 8V the circuit shows a high immunity of the reset output against supply transients of more than 100V/µs. For supply voltages less than 8V supply transients of more than 0.4V/µs can cause a reset signal disturbance. To improve the transient behaviour for supply voltages...

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Application information present functions are required. The modular approach of this device allows to get easily also other features and functions when required. Voltage regulator The voltage regulator uses an Isolated Collector Vertical PNP transistor as a regulating element. Figure 4. Foldback characteristic of VO With this structure very low dropout voltage at currents up to 100mA is obtained. The dropout operation of the standby regulator is maintained down to 3V input supply voltage. The output voltage is regulated up to the transient input supply voltage of 40V. With this feature no...

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