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AP133-SN-W Datasheet(PDF) 11 Page - Diodes Incorporated |
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AP133-SN-W Datasheet(HTML) 11 Page - Diodes Incorporated |
11 / 14 page AP133 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR AP133 Rev. 2 11 of 14 MAY 2007 www.diodes.com © Diodes Incorporated Low Quiescent Current Cellular phone baseband internal digital circuits typically operate from 1.8V to 2.6V. When the Li+ battery voltage falls to 3.2-3.3V, most phones shut off, giving at least 500-600mV of headroom for the baseband digital LDO, so dropout is not critical. Output noise and the PSRR are not critical specs for the digital circuits. Nonetheless, this supply requires low quiescent current at light loads because this LDO stays on at all times. Figure below shows how the digital supply current of a representative GSM chipset core varies as a function of time. In the standby mode, the microprocessor consumes only around 200µA. Since the phone stays in standby for the longest percentage of time, using a 40µA quiescent current LDO, instead of 140µA, saves 100µA and extends the standby time by 340µA/240µA, or 1.417 times. The baseband internal analog circuit is typically 2.4V-3.0V, and it requires 200-600mV dropout. This LDO is on all the time, so it requires low quiescent current as well. The cellular phone real-time clock LDO needs a very low quiescent current, since this LDO is on all the time even though the handset is powered off. The AP133, consuming only around 40µA for all input range and output loading, provides great power saving in portable and low power applications. Wide Output Range The AP133, with a wide output range of 1.0V to 5.0V, provides a versatile LDO solution for many portable applications. High PSRR The RF circuit consists of receive and transmit sections, which typically require 2.6V-3.0V supply voltage. The RF circuits such as LNA (low-noise amplifier), up/down-converter, mixer, PLL, VCO, and IF stage, require low noise and high PSRR LDOs. The temperature-compensated crystal oscillator circuit requires very high PSRR at RF power amplifier burst frequency. For instance, minimum 65dB PSRR at 217Hz is recommended for the GSM handsets. In order to provide good audio quality, the audio power supply for hand-free, game, MP3, and multimedia applications in cellular phones, require low-noise and high PSRR at audio frequency range (20Hz-20kHz). The AP133, with PSRR of 70dB at 1kHz in best case, is suitable for some of these applications that require high PSRR. |
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