MIC23254-GCYMT-TR Microchip

MIC23254 4MHz Dual 400mA Synchronous Buck Regulator with Low Input Voltage and HyperLight Load General Description Features The MIC23254 is a low-input voltage, high-efficiency 4MHz Low input voltage range: 2.5V to 5.5V dual 400mA synchronous buck regulator with HyperLight Dual output current 400mA/400mA Load mode. HyperLight Load provides very-high Up to 94% peak efficiency and 85% efficiency at 1mA efficiency at light loads and ultra-fast transient response 33A dual quiescent current which is perfectly suited for supplying processor core 1H inductor with a 4.7F capacitor voltages. An additional benefit of this proprietary 4MHz in PWM operation architecture is very-low output ripple voltage throughout the entire load range with the use of small output Ultra-fast transient response capacitors. MIC23254 operates from an input voltage Low voltage output ripple down to 2.5V for low battery states. The MIC23254 has a 20mVpp in HyperLight Load mode tiny 2mm x 2mm Thin MLF package that saves precious 3mV output voltage ripple in full PWM mode board space by requiring only 6 additional external 0.01A shutdown current components to drive both outputs up to 400mA each. Fixed output:10-pin 2mm x 2mm Thin MLF The device is designed for use with a 1H inductor and a 40 C to +125 C junction temperature range 4.7F output capacitor that enables a sub-1mm height. The MIC23254 has a very-low quiescent current of 33A with both outputs enabled and can achieve over 85% Applications efficiency at 1mA. At higher loads the MIC23254 provides a Mobile handsets constant switching frequency around 4MHz while providing Portable media players peak efficiencies over 90%. Portable navigation devices (GPS) The MIC23254 fixed output voltage option is available in a WiFi/WiMax/WiBro modules 10-pin 2mm x 2mm Thin MLF . The MIC23254 is designed Digital cameras to operate over the junction operating range from 40C to Wireless LAN cards +125C. 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 VIN = 3.0V 90 80 70 60 VIN = 3.6V VIN = 2.7V 50 VIN = 4.2V 40 30 20 L = 1H 10 COUT = 4.7F 0 1 10 100 1000 LOAD (mA) HyperLight Load is a 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. MIC23254 Ordering Information Nominal Nominal Junction Marking Lead Part Number Output Output Temperature Package Code Finish Voltage 1 Voltage 2 Range MIC23254-GCYMT GCW 1V 1.8V 40 to +125C 10-Pin 2mm x 2mm Thin MLF Pb-Free Notes: 1. Thin MLF is GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. Pin Configuration SNS1 1 10 SNS2 EN1 2 9 EN2 AGND 3 8 AVIN SW1 4 7 SW2 PGND 5 6 VIN 10-Pin 2mm x 2mm Thin MLF (MT) Fixed Output (Top View) Pin Description Pin Number Pin Name Pin Function (Fixed) Sense 1 (Input): Connect to V as close to output capacitor as possible to sense output 1 OUT1 1 SNS1 voltage. Enable 1 (Input): Logic low will shut down output 1. Logic high powers up output 1. Do not leave 2 EN1 unconnected. 3 AGND Analog Ground. Must be connected externally to PGND. 4 SW1 Switch Node 1 (Output): Internal power MOSFET output. 5 PGND Power Ground. 6 VIN Supply Voltage (Power Input): Requires close bypass capacitor to PGND. 7 SW2 Switch Node 2 (Output): Internal power MOSFET output. 8 AVIN Supply Voltage (Power Input): Analog control circuitry. Connect to VIN. Enable 2 (Input): Logic low will shut down output 2. Logic high powers up output 2. Do not leave 9 EN2 unconnected. Sense 2 (Input): Connect to V as close to output capacitor as possible to sense output 2 OUT2 10 SNS2 voltage. M9999-052510 May 2010 2