MIC47100: 1A High Speed Low VIN LDO - Micrel - #1

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MIC47100 1A High Speed Low VIN LDO MicroLead Frame and MLF are registered trademark of Amkor Technology Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com September 2008 M9999-092908-B General Description The MIC47100 is a high speed, Low VIN LDO capable of delivering up to 1A and designed to take advantage of point of load applications that use multiple supply rails to generate a low voltage, high current power supply. The MIC47100 is stable with only a 1ìF ceramic output capacitor and is available in a thermally enhanced 2mm × 2mm MLF® package thus making it an optimal solution for board-constrained applications. The MIC47100 has an NMOS output stage offering very low output impedance. The NMOS output stage offers a unique ability to respond very quickly to sudden load changes such as that required by a microprocessor, DSP or FPGA. The MIC47100 consumes little quiescent current and therefore can be used for driving the core voltages of mobile processors, post regulating a core DC/DC converter in any portable device. The MIC47100 is available in fixed and adjustable output voltages in the exposed pad MSOP-8 package and the tiny 2mm × 2mm MLF® package with an operating junction temperature range of -40°C to +125°C. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Features • Operating voltage range: - Input Supply: 1.0V to 3.6V - Bias Supply: 2.3V to 5.5V • 0.8V to 2.0V output voltage range • High bandwidth – very fast transient response • PSRR >50dB at 100kHz • Stable with a 1ìF ceramic output capacitor • Low dropout voltage of 80mV at 1A • High output voltage accuracy: - +/- 1.5% initial accuracy - +/- 2% over temperature • Logic level enable input • UVLO on both supply voltages for easy turn-on • ePad MSOP-8 – small form factor power package • Thermally enhanced 2mm × 2mm MLF® – smallest solution Applications: • Point of Load • PDAs • DSP, PLD and FPGA Power Supply • Low Voltage Post Regulation ___________________________________________________________________________________________________________ Typical Application