MIC33050-AYHL-TR

MIC33050 4MHz Internal Inductor PWM Buck Regulator with HyperLight Load General Description Features The Micrel MIC33050 is a high-efficiency 600mA PWM Input voltage: 2.7V to 5.5V synchronous buck (step-down) regulator with internal 600mA output current inductor featuring HyperLight Load, a patent-pending Fixed and adjustable output voltage options switching scheme that offers best-in-class light load No external inductor required efficiency and transient performance while providing very Ultra-fast transient response small external components and low output ripple at all 20A quiescent current loads. 4MHz switching in PWM mode The MIC33050 also has a very-low typical quiescent Low output voltage ripple current of 20A and can achieve over 85% efficiency even at 1mA. >93% peak efficiency >85% efficiency at 1mA In contrast to traditional light load schemes, the HyperLight Load architecture does not trade off control speed to Micropower shutdown obtain low standby currents and in doing so, the device 12-pin 3mm x 3mm MLF only needs a small output capacitor to absorb the load 40 C to +125 C junction temperature range transient as the powered device goes from light load to full load. Applications At higher loads, the MIC33050 provides a constant switching frequency of greater than 4MHz while providing Cellular phones peak efficiencies greater than 93%. Digital cameras The MIC33050 is available in fixed and adjustable output Portable media players voltages and comes in a 12-pin 3mm x 3mm MLF with a Wireless LAN cards junction operating range of 40 C to +125 C. WiFi, WiMax, and WiBro modules Data sheets and support documentation can be found on USB-powered devices Micrels web site at: www.micrel.com. Typical Application HyperLight Load is a registered trademark of Micrel, Inc. 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. MIC33050 Ordering Information Part Number Voltage Temperature Range Package Lead Finish MIC33050-CYHL 1.0V 40 to +125C 12-Pin 3mm x 3mm MLF Pb-Free MIC33050-4YHL 1.2V 40 to +125C 12-Pin 3mm x 3mm MLF Pb-Free MIC33050-GYHL 1.8V 40 to +125C 12-Pin 3mm x 3mm MLF Pb-Free MIC33050-SYHL 3.3V 40 to +125C 12-Pin 3mm x 3mm MLF Pb-Free MIC33050-AYHL ADJ 40 to +125C 12-Pin 3mm x 3mm MLF Pb-Free Notes: 1. Other output voltage options available. Please contact Micrel for details. 2. MLF is a green RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. Pin Configuration 12-Pin 3mm x 3mm MLF (HL) Fixed Output 12-Pin 3mm x 3mm MLF (HL) Adjustable Output Top View Top View Pin Description Pin Number Pin Number Pin Name Pin Function (Fixed) (Adj) 1 1 VIN Supply Voltage (Input): Requires bypass capacitor-to-GND. 2 2 PGND Power Ground. 3, 4, 5, 6 3, 4, 5, 6 SW Switch (Output): Internal power MOSFET output switches. 7, 8 7, 8 OUT Output after the internal inductor. 9 9 EN Enable (Input): Logic low will shut down the device, reducing the quiescent current to less than 4A. Do not leave floating. 10 10 SNS Input to the error amplifier. Connect to the external resistor divider network to see the output voltage. For fixed output voltages connect V (internal resistor OUT network sets the output voltage). 11 CFF Feed forward capacitor connected to out sense pin. 11 FB Feedback voltage. Connect a resistor divider from output to ground to set the output voltage. 12 12 AGND Analog ground. EP EP ePad Exposed Heatsink Pad. Connect to power ground for best thermal performance. M9999-050312-C May 2012 2