MIC49200-1.8WR Microchip

MIC49200 2A Low Voltage LDO with Dual Input Voltages General Description Features Input Voltage Range: The MIC49200 is a high-bandwidth, low-dropout, 2A V : 1.4V to 6.5V IN voltage regulator ideal for powering core voltages of low- V : 3.0V to 6.5V power microprocessors. The MIC49200 implements a BIAS dual supply conguration allowing for very low output Stable with 1F ceramic output capacitors impedance and very fast transient response. 1% initial tolerance Maximum dropout voltage (V V ) of 500mV The MIC49200 requires a bias input supply and a main IN OUT over temperature input supply, allowing for ultra-low input voltages on the main supply rail. The input supply operates from 1.4V to Adjustable output voltage down to 0.9V 6.5V and the bias supply requires between 3V and 6.5V Ultra fast transient response (Up to 10MHz for proper operation. The MIC49200 offers xed output bandwidth) voltages from 0.9V to 1.8V and adjustable output voltages Excellent line and load regulation specications down to 0.9V. Logic controlled shutdown option The MIC49200 requires a minimum of output capacitance Thermal shutdown and current limit protection for stability, working optimally with small ceramic Junction temperature range: 40C to 125C capacitors. The MIC49200 is available in a 5-pin S-Pak. Its operating Applications temperature range is 40C to +125C. Set-top box Data sheets and support documentation can be found on Graphics processors Micrels web site at: www.micrel.com. PC add-in cards Microprocessor core voltage supply Low voltage digital ICs High efficiency linear power supplies SMPS post regulators Typical Application Load Transient V = 2.8V IN V = 1.8V OUT V = 4V BIAS C = 1F OUT Low Voltage, Fast Transient Response Regulator Time (40s/div) Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC49200 Ordering Information Part Number Output Junction Voltage Package Current Temperature Range RoHS Compliant 2A MIC49200-1.0WR* 1.0V 40C to +125C S-Pak-5 MIC49200-1.8WR* 2A 1.8V 40C to +125C S-Pak-5 MIC49200WR* 2A Adj 40C to +125C S-Pak-5 * RoHS compliant with high-melting solder exemption. Pin Configuration 5-Pin S-Pak (R) Pin Description Pin Number Pin Name Pin Function S-Pak-5 1 EN Enable (Input): CMOS compatible input. Logic High = enable Logic Low = shutdown. ADJ Adjustable regulator feedback input. Connect to resistor voltage divider. 2 VBIAS Input Bias voltage for powering all circuitry on the regulator with the exception of the output power device. 3 GND Ground (TAB is connected to ground on S-Pak). 4 VIN Input voltage which supplies current to the output power device. 5 VOUT Regulator Output. 2 M9999-011306 January 2006 (408) 955-1690