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AS3515 Datasheet(PDF) 28 Page - ams AG |
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AS3515 Datasheet(HTML) 28 Page - ams AG |
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28 / 67 page  AS3515 V15 austriamicrosystems Data Sheet, Confidential www.austriamicrosystems.com Revision 3.1 27 - 66 6.9 3V Step-Up Converter 6.9.1 General • Output voltage 3V to 3.6V (BVDD) programmable in 4 steps via DCDC3p bit to save power • Input voltage 1V (1.2V) to 3V, voltages higher than that can be connected to BVDD directly • Maximum output current to BVDD: 150mA • Current mode operation • On-chip compensation and feedback network • On chip 300mΩ NMOS switch • PWM mode with 1.2MHz switching frequency • Inductor current limitation 850mA • Pulse skipping capability • Low quiescent current: 40μA in PFM-mode, 300μA in PWM mode • ≤1μA shutdown current • uses external coil (6.8uH) and Schottky diode (500mA) Figure 9 DCDC Block Diagram Oscillator 1.2MHz Ramp generation NMOS Power Device 300m Ω Error amplifier Current sense PWM-LOGIC + - Pulse skipping logic VBAT PWR_GND Σ Comparator VSS Vref 1.6V SW DCDC step up ENDCDC 1M Ω 1M Ω PWR_UP VSS3 SW3 BVDD VSS |
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