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(C) 2004 SYNC POWER CORP. ALL Rights Reserved. 9F-5, No. 3-2, Park Street, Nankang District, (NKSP), Taiwan, 115 Tel:886-2-2655-8178 Fax:886-2-2655-8468.

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Presentation on theme: "(C) 2004 SYNC POWER CORP. ALL Rights Reserved. 9F-5, No. 3-2, Park Street, Nankang District, (NKSP), Taiwan, 115 Tel:886-2-2655-8178 Fax:886-2-2655-8468."— Presentation transcript:

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2 (C) 2004 SYNC POWER CORP. ALL Rights Reserved. 9F-5, No. 3-2, Park Street, Nankang District, (NKSP), Taiwan, 115 Tel: Fax: Low Voltage - Low Dropout Regulator

3 (C) 2004 SYNC POWER CORP. ALL Rights Reserved. 9F-5, No. 3-2, Park Street, Nankang District, (NKSP), Taiwan, 115 Tel: Fax: LDO Character LDO stands for Low Drop-Out Regulator Minimize the difference between the input and output voltage when it ceases to regulate Provide a relatively simple and inexpensive power management solution

4 (C) 2004 SYNC POWER CORP. ALL Rights Reserved. 9F-5, No. 3-2, Park Street, Nankang District, (NKSP), Taiwan, 115 Tel: Fax: LDO Block Diagram Vout = ((R2+R1)/R2) * Vref

5 (C) 2004 SYNC POWER CORP. ALL Rights Reserved. 9F-5, No. 3-2, Park Street, Nankang District, (NKSP), Taiwan, 115 Tel: Fax: LDO Key Parameters Dropout Voltage Load Regulation Line Regulation Power Supply Rejection Ratio Output voltage is controlled by the resistive negative feedback Input voltage must be greater than the output voltage Low quiescent current

6 (C) 2004 SYNC POWER CORP. ALL Rights Reserved. 9F-5, No. 3-2, Park Street, Nankang District, (NKSP), Taiwan, 115 Tel: Fax: Low Drop-Out Voltage Regulator Composed of the following: Voltage Reference Pass Element Error Amplifier Feedback Resistors

7 (C) 2004 SYNC POWER CORP. ALL Rights Reserved. 9F-5, No. 3-2, Park Street, Nankang District, (NKSP), Taiwan, 115 Tel: Fax: Voltage Reference Provides a constant output voltage which will be compared with the output voltage from the feedback network

8 (C) 2004 SYNC POWER CORP. ALL Rights Reserved. 9F-5, No. 3-2, Park Street, Nankang District, (NKSP), Taiwan, 115 Tel: Fax: Error Amplifier and Resistive Network Error Amplifier –Produces an error signal whenever the fed back sensed output differs from the reference voltage Feedback Network –Produces the output voltage (voltage divider)

9 (C) 2004 SYNC POWER CORP. ALL Rights Reserved. 9F-5, No. 3-2, Park Street, Nankang District, (NKSP), Taiwan, 115 Tel: Fax: LDO Application PCMCIA Card Cellular Phones Camcorders Cameras DSL/Cable Modems MP3/CD Players


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