MIC23031-4YMT-TR Microchip

MIC23031 4MHz PWM 400mA Buck Regulator with HyperLight Load General Description Features The MIC23031 is a high-efficiency 4MHz 400mA Input voltage: 2.7V to 5.5V synchronous buck regulator with HyperLight Load mode. 400mA output current HyperLight Load provides very-high efficiency at light Up to 93% efficiency and 88% at 1mA loads and ultra-fast transient response which is perfectly 21A typical quiescent current suited for supplying processor core voltages. An additional benefit of this proprietary architecture is very-low output 4MHz PWM operation in continuous mode ripple voltage throughout the entire load range with the use Ultra-fast transient response of small output capacitors. The tiny 1.6mm x 1.6mm Thin Low voltage output ripple MLF package saves precious board space and requires 20mVpp ripple in HyperLight Load mode only three external components. 3mV output voltage ripple in full PWM mode The MIC23031 is designed for use with a very-small 0.01A shutdown current inductor, down to 0.47H, and an output capacitor as small as 2.2F that enables a sub-1mm height. Fixed and adjustable output voltage options available The MIC23031 has a very-low quiescent current of 21A 6-pin 1.6mm x 1.6mm Thin MLF and achieves as high as 88% efficiency at 1mA. At higher 40 C to +125 C junction temperature range loads, the MIC23031 provides a constant switching Applications frequency around 4MHz while achieving peak efficiencies up to 93%. Mobile handsets The MIC23031 is available in a 6-pin 1.6mm x 1.6mm Thin Portable media/MP3 players MLF package with an operating junction temperature Portable navigation devices (GPS) range from 40 C to +125C. WiFi/WiMax/WiBro modules Data sheets and support documentation can be found on Digital Cameras Micrels web site at: www.micrel.com. Wireless LAN cards USB-powered devices Portable applications Typical Application HyperLight Load is a trademark of Micrel, Inc MLF and MicroLead Frame 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. MIC23031 Ordering Information Marking Nominal Junction Part Number Package Lead Finish Code Output Voltage Temperature Range MIC23031-AYMT GEA Adjustable 40C to +125C 6-Pin 1.6mm 1.6mm Thin MLF Pb-Free MIC23031-GYMT GEG 1.8V Pb-Free 40C to +125C 6-Pin 1.6mm 1.6mm Thin MLF MIC23031-FYMT GEF 1.5V 40C to +125C 6-Pin 1.6mm 1.6mm Thin MLF Pb-Free MIC23031-4YMT GE4 1.2V 40C to +125C 6-Pin 1.6mm 1.6mm Thin MLF Pb-Free MIC23031-CYMT GEC 1.0V 40C to +125C 6-Pin 1.6mm 1.6mm Thin MLF Pb-Free Notes: 1. Other options available. Contact Micrel for details. 2. Thin MLF is GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. Pin Configuration VIN 1 VIN 1 6 PGND 6 GND SW 2 SW 2 5 AGND 5 FB SNS 3 4 EN SNS 3 4 EN 6-Pin 1.6 x 1.6mm Thin MLF (MT) 6-Pin 1.6 x 1.6mm Thin MLF (MT) Fixed (Top View) Adjustable (Top View) Pin Description Fixed Adjustable Pin Name Pin Function Option Option 1 1 VIN Input Voltage: Connect a capacitor to ground to decouple the noise. 2 2 SW Switch (Output): Internal power MOSFET output switches. Sense: Connect to V as close to output capacitor as possible to sense output OUT 3 3 SNS voltage. Enable (Input): Logic high enables operation of the regulator. Logic low will shut down 4 4 EN the device. Do not leave floating. Analog Ground: Connect to central ground point where all high current paths meet 5 AGND (C , C , PGND) for best operation. IN OUT Feedback (Input): Connect resistor divider at this node to set output voltage. Resistors 5 FB should be selected based on a nominal V of 0.62V. FB 6 PGND Power Ground. 6 GND Ground. ePad ePad HS PAD Connect to PGND or GND. M9999-102210-A October 2010 2