MIC5253 Micrel MIC5253 100mA Low Noise Cap Teeny LDO General Description Features The MIC5253 is an efficient, CMOS voltage regulator opti- Input voltage range: 2.7V to 5.5V mized for ultra-low-noise applications. It offers 1.5% initial Teeny SC-70-5 package accuracy, extremely low dropout voltage (165mV at 100mA), Ultra-low output noise: 30 V(rms) and low ground current (typically 95 A at full load). The 100mA continuous output current, 150mA peak current MIC5253 provides a very low noise output, ideal for RF Stability with ceramic output capacitors applications where a clean voltage source is required. A Ultralow dropout: 165mV 100mA noise bypass pin is also available for further reduction of High output accuracy: output noise. 1.5% initial accuracy 3.0% over temperature Designed specifically for handheld and battery-powered de- Low ground current: 95 A vices, the MIC5253 provides a TTL-logic-compatible enable TTL-Logic-controlled enable input pin. When disabled, power consumption drops nearly to zero. Zero off-mode current The MIC5253 also works with low-ESR ceramic capacitors, Thermal shutdown and current limit protection reducing the amount of board space necessary for power applications, critical in handheld wireless devices. Applications Available in the Teeny SC-70-5 package, the MIC5253 offers a wide range of output voltages. Key features include Cellular phones and pagers current limit, thermal shutdown, faster transient response, Cellular accessories and an active clamp to speed up device turn-off. Battery-powered equipment Laptop, notebook, and palmtop computers Consumer/personal electronics Typical Application MIC5253-x.xBC5 V V IN OUT C = 1.0 F 15 IN Ceramic 2 C = 1.0 F OUT Enable 3 4 Ceramic Shutdown EN EN (pin 3) may be C = 0.01 F connected directly BYP to IN (pin 1). Ultra-Low-Noise Regulator Application Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 MIC5253 Micrel Ordering Information Part Number Junction Voltage* Package Standard Marking Pb-Free Marking** Temp. Range MIC5253-1.5BC5 715 MIC5253-1.5YC5 715 1.5V 40C to +125C SC-70-5 MIC5253-1.8BC5 718 MIC5253-1.8YC5 718 1.8V 40C to +125C SC-70-5 MIC5253-1.85BC5 71J MIC5253-1.85YC5 71J 1.85V 40C to +125C SC-70-5 MIC5253-2.5BC5 725 MIC5253-2.5YC5 725 2.5V 40C to +125C SC-70-5 MIC5253-2.6BC5 726 MIC5253-2.6YC5 726 2.6V 40C to +125C SC-70-5 MIC5253-2.7BC5 727 MIC5253-2.7YC5 727 2.7V 40C to +125C SC-70-5 MIC5253-2.8BC5 728 MIC5253-2.8YC5 728 2.8V 40C to +125C SC-70-5 MIC5253-2.9BC5 729 MIC5253-2.9YC5 729 2.9V 40C to +125C SC-70-5 MIC5253-3.0BC5 730 MIC5253-3.0YC5 730 3.0V 40C to +125C SC-70-5 MIC5253-3.1BC5 731 MIC5253-3.1YC5 731 3.1V 40C to +125C SC-70-5 MIC5253-3.2BC5 732 MIC5253-3.2YC5 732 3.2V 40C to +125C SC-70-5 MIC5253-3.3BC5 733 MIC5253-3.3YC5 733 3.3V 40C to +125C SC-70-5 * Other voltage options available. Contact Micrel Marketing for details. ** Under bar symbol ( ) may not be to scale. Pin Configuration EN GND IN 3 22 1 7xx 4 5 BYP OUT SC-70-5 (C5) Pin Description Pin Number Pin Name Pin Function 1 IN Supply Input. 2 GND Ground. 3 EN Enable/Shutdown (Input): CMOS compatible input. Logic high = enable logic low = shutdown. Do not leave open. 4 BYP Reference Bypass: Connect external 0.01 F C 1.0 F capacitor to GND to reduce output BYP noise. May be left open. 5 OUT Regulator Output. M9999-112305 2 November 2005