Power and battery management ICs for Lowcost portable

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

Power Management Product Line PLAN • Introduction • Low-cost Process • Linear regulators • Switched regulators • Battery Chargers • Example of PM for Mobiles • Conclusion H. AMRANI Slide 2 Power and battery management ICs for Low-cost portable electronics

Power Management Product Line Why power management chips • Power management chips are the interface between batteries and different chips (RF, Base-band 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 H. AMRANI PC Private mobile radio Slide 3 Camera PDA Power and battery management ICs for Low-cost portable electronics

Power Management Product Line Low-cost Process • Based on standard process – 0. 35 um - 16 k. G/mmsq – 3 or 4 Metal Layers – 3. 3 V Low Voltage P/N MOS – 5. 5 V Middle Voltage P/N MOS (to be compatible with Li-ion batteries) – 17 V (Drain-Source) High Voltage NMOS (Drain Extended - Gate-Source=5. 5 V, to be compatible with low-cost charging devices) • Options – 17 V High Voltage PMOS and Isolated-NMOS (Drain Extended) – Poly 1 -Poly 2 capacitors H. AMRANI Slide 4 Power and battery management ICs for Low-cost portable electronics

Power Management Product Linear regulators Gain (db) • Low Quiescent Current IL 1 Gdc IL 2>IL 1 • High PSRR -20 db/dec • Low Noise -40 db/dec -20 db/dec pc 0 db p 1 p 2 zc F (Hz) ugf -40 db/dec VDD VIN VOUT H. AMRANI Slide 5 VOUT Power and battery management ICs for Low-cost portable electronics

Power Management Product Line Switched regulators • Efficiency • Pulse width modulation • Soft control of the switching frequency VBAT Limitation ref Digital Reverse-current control ref Duty cycle generation Bandgap ref Output Voltage Ctrl (X bits) DCenable Feedback Frequency control H. AMRANI VOUT GRND Slide 6 Power and battery management ICs for Low-cost portable electronics

Power Management Product Line Battery Chargers Source is AC/DC adapter Continuous Mode Pulsed Mode ACDC ADAPTER AC/DC Adapter Control VBAT - DAC MUX ADC AMP + Current feedback 0. 05 - 4. 2 V Control VBAT Voltage Feedback GND Continuous : Current loop followed by voltage loop H. AMRANI + VBATS Slide 7 Pulsed : If VBAT is lower than 4. 2 V, the PNP is on for 10 ms. If VBAT remains lower than 4. 2 V the PNP remains on until the voltage of the VBAT reaches 4. 2 V. At this point the PNP switch off for at least 10 ms. Then if VBAT is lower than 4. 2 V, we switch on the PNP. Power and battery management ICs for Low-cost portable electronics

Power Management Product Line Battery Chargers Source is AC/DC adapter Continuous Mode Current / Voltage Constant Current Constant Voltage üExternal sense resistor for end of charge detection üCurrent calibration üBig silicon area üStability compensation H. AMRANI Pulsed Mode Slide 8 Pulsed Current üNo external sense resistor for end of charge detection üNo calibration is needed üSmall silicon area üNo problem of stability Power and battery management ICs for Low-cost portable electronics

Power Management Product Line Example of PM for Mobiles ü Battery Charger (pulsed mode) ü 8 Linear Regulators (3 for RF) ü DC/DC Step DOWN (0. 9 to 2. 5 V / 300 m. AInternal Switches) ü Temperature & Voltage Supervision ü Vibrator & Buzzer Driver ü Start up Driven by Button ü SIM Interface ü Very Low Current Consumption in Sleep Mode ü Backup Battery management ü BGA 49 5 x 5 mm H. AMRANI Slide 9 Power and battery management ICs for Low-cost portable electronics

Power Management Product Line Small Package One of the smallest packages for complete PM on the market BGA 49 5 mmx 5 mm 0. 65 ball pitch 1. 2 mm thickness H. AMRANI Slide 10 Power and battery management ICs for Low-cost portable electronics

Power Management Product Line 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. 13 um CMOS technology with low cost option of drain extended, for a one chip solution (RF + Base band + power management). H. AMRANI Slide 11 Power and battery management ICs for Low-cost portable electronics

Power Management Product Line Thank you for your attention For any further details. . . Hafid AMRANI Power Management Design Manager ATMEL Rousset France hamrani@atmel. com +33 -442 -53 -7452 H. AMRANI Slide 12 Power and battery management ICs for Low-cost portable electronics