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L2949E Datasheet(PDF) 5 Page - Unisonic Technologies |
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L2949E Datasheet(HTML) 5 Page - Unisonic Technologies |
5 / 7 page UTCL2949E LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO. LTD 5 QW-R102-014,A FUNCTIONAL DESCRIPTION The UTC L2949E is a monolithic integrated voltage regulator,based on the STM modular voltage regulator approch.Several outstanding features and auxiliary functions are implemented to meet the requirements of supplying microprocessor systems in automotive applications.Nevertheless,It is suitable also in other applications where the 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 lsolated Collector Vertical PNP transistor as a regulating element. 5 0 20 100 200 IOUT(mA) 10 Figure 1: 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 4V.With this feature no functional interruption due to overvoltage pulses is generated.The typical cuve showing the standby.output voltage as a function of the input supply voltage is shown in Fig.2. The current consumption of the device(quiescent current) is less than 300μA. To reduce the quiescent current peak in the undervoltage region and to improve the transient response inthis region.the dropout voltage is controlled,the quiescent current as a function of the supply input voltage is shown in Fig.3. |
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