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AS3525 Datasheet(PDF) 121 Page - ams AG |
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AS3525 Datasheet(HTML) 121 Page - ams AG |
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121 / 194 page  AS3525-A/-B C22O22 Data Sheet, Confidential © 2005-2009, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved. www.austriamicrosystems.com Revision 1.13 121 - 194 7.4.2 3V Step-Up Converter 7.4.2.1 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 (6.8 μH) and Schottky diode (500mA) Figure 45 DCDC 3V Block Diagram 7.4.2.2 Parameter Table 99 DCDC Boost Parameter Symbol Parameter Notes Min Typ Max Unit Power down mode 5 μA PFM mode operation 40 μA IVDD2.9 Supply Current PWM mode (low output load) 300 μA VSTARTUP Startup Voltage RLoad>220Ω 1.0 V VHOLD Hold-on Voltage IOUT=1mA, VBAT falling from 1.5 to 0V 0.5 V RSW_on Internal Switch RDS_ON 300 mΩ fSW Switching Frequency Start-up, X3VOK=1 100 250 500 kHz PWM mode operation, X3VOK=0 1.2 MHz tON_min Minimum On-time 100 ns tOFF_min Minimum Off-time 100 ns ηeff Efficiency IOUT=20mA, Vin=1.35 85 % IOUT=50mA, Vin=1.5 87 % ISW_LIM Current Limit 1.0V ≤ VB1V ≤ 3.0V 0.60 0.85 1.10 A IOUT Load Current VB1V=1.0V 150 mA Vin=1.0..2.0V, C(VBAT_1V) = 2.2 μF ceramic || 2000μF Elko, C(BVDD) = 3 x 2.2μF ceramic, L=DS1608 6.8μH, Temp = 25deg |
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