MIC23155YMT-TR

MIC23155 3MHz PWM 2A Buck Regulator with HyperLight Load and Power Good General Description Features The MIC23155 is a high-efficiency 3MHz 2A synchronous Input voltage: 2.7V to 5.5V buck regulator with HyperLight Load mode, power good Output voltage: fixed or adjustable (down to 0.7V) output indicator, and programmable soft start. HyperLight Up to 2A output current Load provides very high efficiency at light loads and ultra- Up to 94% peak efficiency fast transient response which makes the MIC23155 85% typical efficiency at 1mA perfectly suited for supplying processor core voltages. An additional benefit of this proprietary architecture is very low Power good output output ripple voltage throughout the entire load range with Programmable soft start the use of small output capacitors. The tiny 2.5mm x 22A typical quiescent current 2.5mm Thin DFN package saves precious board space 3MHz PWM operation in continuous conduction mode and requires only four external components. Ultra-fast transient response The MIC23155 is designed for use with a very small inductor, down to 0.47H, and an output capacitor as small Active output discharge when disabled as 2.2F that enables a total solution size, less than 1mm Low output voltage ripple in height. Fully-integrated MOSFET switches The MIC23155 has a very low quiescent current of 22A 0.01A shutdown current and achieves a peak efficiency of 94% in continuous Thermal-shutdown and current-limit protection conduction mode. In discontinuous conduction mode, the MIC23155 can achieve 85% efficiency at 1mA. 10-pin 2.5mm x 2.5mm Thin DFN 40C to +125C junction temperature range The MIC23155 is available in a 10-pin 2.5mm x 2.5mm Thin DFN package with an operating junction temperature Applications range from 40C to +125C. Datasheets and support documentation can be found on Solid state drives (SSD) Micrels web site at: www.micrel.com Smart phones Tablet PCs Mobile handsets Portable devices (PMP, PND, UMPC) WiFi/WiMax/WiBro applications Typical Application Fixed Output Voltage Adjustable Output Voltage HyperLight Load is a registered trademark of Micrel, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel Inc. MIC23155 Ordering Information Junction Part Number Marking Code Nominal Output Voltage Temperature Package Range MIC23155-GYMT QLG 1.8V 40C to +125C 10-Pin 2.5mm x 2.5mm Thin DFN MIC23155YMT QLA Adjustable 40C to +125C 10-Pin 2.5mm x 2.5mm Thin DFN Notes: 1. Other fixed output voltage options available. Contact Micrel Marketing for details. 2. Thin DFN is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. 3. Thin DFN = Pin 1 identifier. Pin Configuration 2.5mm x 2.5mm Thin DFN (MT) 2.5mm x 2.5mm Thin DFN (MT) Fixed Output Voltage Adjustable Output Voltage (Top View) (Top View) Pin Description Pin Number Pin Number Pin Name Pin Function (Fixed) (Adjustable) 1 1 SW Output Switch Node 2 2 EN Enable: Logic high enables operation of the regulator. Logic low will shut down the device. Do not leave floating. 3 3 SNS Output Voltage Sensing Pin. When disabled, provides output discharge. 4 NC Not internally connected. 4 FB Feedback connection for output voltage sensing. 5 5 PG Power Good Indicator. Open drain output. 6 6 SS Programmable Soft-Start Pin. Do not leave floating. 7 7 AGND Analog Ground. Ground path for bias and control circuitry. 8,9 8,9 VIN Input Voltage Supply. 10 10 PGND Power Ground. Ground path for high current circuitry. ePAD ePAD ePAD Exposed heat sink pad. Connect to PGND. November 2012 2 M9999-110812-A