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Power and battery management ICs for Low-cost portable electronics

Power and battery management ICs for Low-cost portable electronics. Hafid AMRANI Hubert CORDONNIER. PLAN. Introduction Low-cost Process Linear regulators Switched regulators Battery Chargers Example of PM for Mobiles Conclusion. Why power management chips.

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Power and battery management ICs for Low-cost portable electronics

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  1. Power and battery management ICs for Low-cost portable electronics Hafid AMRANI Hubert CORDONNIER

  2. PLAN • Introduction • Low-cost Process • Linear regulators • Switched regulators • Battery Chargers • Example of PM for Mobiles • Conclusion

  3. Why power management chips • Power management chips are the interface between batteries and • different chips (RF, Base-band and Digital) • Different elements need special supply voltage and have also different • requirements in terms of noise, power supply rejection ratio (PSRR) • and quiescent current • Each power function needs temperature protection, precise reference voltage • (trimming) Mobile phone PC Private mobile radio Camera PDA

  4. Low-cost Process • Based on standard process • 0.35um - 16kG/mmsq • 3 or 4 Metal Layers • 3.3V Low Voltage P/N MOS • 5.5V Middle Voltage P/N MOS (to be compatible with Li-ion batteries) • 17V (Drain-Source) High Voltage NMOS (Drain Extended - Gate-Source=5.5V, to be compatible with low-cost charging devices) • Options • 17V High Voltage PMOS and Isolated-NMOS (Drain Extended) • Poly1-Poly2 capacitors

  5. Gain (db) IL1 Gdc IL2>IL1 -20 db/dec -40 db/dec -20 db/dec pc 0 db ugf p2 zc p1 -40 db/dec VDD VIN VDD VIN VOUT Linear regulators • Low Quiescent Current • High PSRR • Low Noise F (Hz) VOUT

  6. VBAT Limitation ref Reverse-current ref Digital control Duty cycle generation Bandgap ref Output Voltage Ctrl (X bits) DCenable VOUT Feedback Frequency control GRND Switched regulators • Efficiency • Pulse width modulation • Soft control of the switching frequency

  7. Continuous Mode Pulsed Mode ACDC ADAPTER Control AC/DC Adapter - DAC AMP VBAT + MUX VBATS Current feedback + 0.05 ADC 4.2V - Control VBAT Voltage Feedback Pulsed : If VBAT is lower than 4.2V, the PNP is on for 10ms. If VBAT remains lower than 4.2V the PNP remains on until the voltage of the VBAT reaches 4.2V.At this point the PNP switch off for at least 10ms. Then if VBAT is lower than 4.2V, we switch on the PNP. GND Continuous : Current loop followed by voltage loop Battery Chargers Source is AC/DC adapter

  8. Source is AC/DC adapter Pulsed Mode Continuous Mode Current / Voltage Current / Voltage Pulsed Current Constant Current Constant Voltage • External sense resistor for end of charge detection • Current calibration • Big silicon area • Stability compensation • No external sense resistor for end of charge detection • No calibration is needed • Small silicon area • No problem of stability Battery Chargers

  9. Example of PM for Mobiles • Battery Charger (pulsed mode) • 8 Linear Regulators (3 for RF) • DC/DC Step DOWN (0.9 to 2.5V / 300mAInternal Switches) • Temperature & Voltage Supervision • Vibrator & Buzzer Driver • Start up Driven by Button • SIM Interface • Very Low Current Consumption in Sleep Mode • Backup Battery management • BGA49 5x5mm

  10. Small Package One of the smallest packages for complete PM on the market BGA49 5mmx5mm 0.65 ball pitch 1.2mm thickness

  11. Conclusion High performance linear and switched regulators are presented in a standard CMOS process. A new low-cost battery charger with pulsed method is presented and is compared with the linear method. These solutions were successfully integrated in the same chip with other features. The challenge for the future is to find new architectures to be implemented in 0.13um CMOS technology with low cost option of drain extended, for a one chip solution (RF + Base band + power management).

  12. Thank you for your attentionFor any further details... Hafid AMRANI Power Management Design Manager ATMEL Rousset France hamrani@atmel.com +33-442-53-7452

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