MIC23051-945YML-TR

MIC23051 4MHz PWM Buck Regulator with HyperLight Load and Voltage Scaling General Description Features The Micrel MIC23051 is a high efficiency 600mA PWM Input voltage: 2.7V to 5.5V HyperLight Load synchronous buck (step-down) regulator featuring 600mA output current HyperLight Load, a patented switching scheme that Fixed output voltage from 0.72V to 3.3V offers best in class light load efficiency and transient Output voltage scaling option performance while providing very small external components and low output ripple at all loads. Ultra fast transient response The MIC23051 has an output voltage scaling feature that 20A typical quiescent current can toggles between two different voltage levels. 4MHz in CCM PWM operation in normal mode The MIC23051 also has a very low typical quiescent 0.47H to 2.2H inductor current draw of 20A and can achieve over 85% efficiency Low voltage output ripple even at 1mA. The device allows operation with a tiny 25mVpp in HyperLight Load mode inductor ranging from 0.47H to 2.2H and uses a small 3mV output voltage ripple in full PWM mode output capacitor that enables a sub-1mm height solution. >93% efficiency In contrast to traditional light load schemes HyperLight ~85% at 1mA Load architecture does not need to trade off control speed to obtain low standby currents and in doing so the Micropower shutdown device only needs a small output capacitor to absorb the Available in 8-pin 2mm x 2mm MLF load transient as the powered device goes from light load 40 C to +125 C junction temperature range to full load. At higher loads the MIC23051 provides a constant Applications switching frequency of greater than 4MHz while providing peak efficiencies greater than 93%. Cellular phones The MIC23051 is available in fixed output voltage options Digital cameras from 0.72V to 3.3V eliminating external feedback Portable media players components. The MIC23051 is available in an 8-pin 2mm x Wireless LAN cards 2mm MLF with a junction operating range from 40 C to +125 C. WiFi/WiMax/WiBro modules USB Powered Devices Data sheets and support documentation can be found on Micrels web site at: www.micrel.com. ____________________________________________________________________________________________________________ Typical Application Efficiency VOUT = 1.8V 100 V = 2.7V IN 90 VIN = 3.6V 80 V = 3.3V IN 70 60 V = 1.8V OUT L = 1H 50 1 10 100 1000 OUTPUT CURRENT (mA) HyperLight Load is a trademark of Micrel, Inc. Protected by US Patent No. 7064531 MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC23051 Ordering Information Part Number Marking Voltage Nominal Junction Package Lead Finish Scaled to Output Temp. Range with VSC low Voltage MIC23051-CGYML JCG 1.0V 1.8V 40 to +125C 8-Pin 2x2 MLF Pb-Free MIC23051-C4YML JC4 1.0V 1.2V 40 to +125C 8-Pin 2x2 MLF Pb-Free MIC23051-16YML J16 1.15V 1.40V 40 to +125C 8-Pin 2x2 MLF Pb-Free MIC23051-945YML 945 0.95V 1.25V 40 to +125C 8-Pin 2x2 MLF Pb-Free Note 1. Other output voltage combinations (0.72 to 3.3V) available, contact Micrel Marketing for details. 2. MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. 3. Over bar symbol ( ) may not be to scale. Pin Configuration SW 1 8PGND EN 2 7 VIN VSC 3 6 AGND SNS 4 5 CFF 8-Pin 2mm x 2mm MLF (Top View) Pin Description Pin Number Pin Name Pin Name 1 SW Switch (Output): Internal power MOSFET output switches. 2 EN Enable (Input). Logic low will shut down the device, reducing the quiescent current to less than 4A. Do not leave floating. 3 VSC Voltage scaling pin (input): A low on this pin will scale the output voltage down to specified level. Do not leave floating. 4 SNS Connect to V to sense output voltage. OUT 5 CFF Feed Forward Capacitor. Connect a 560pF capacitor. 6 AGND Analog Ground. 7 VIN Supply Voltage (Input): Requires bypass capacitor to GND. 8 PGND Power Ground. M9999070809-F July 2009 2