MIC38300 HELDO 3A High-Efficiency Low Dropout Regulator General Description HELDO The MIC38300 is a 3A peak, 2.2A continuous output current step down converter. This is the first device in a Features new generation of HELDO (High-Efficiency Low Dropout) regulators that provide the benefits of an LDO in respect to 3A peak output current ease of use, fast transient performance, high PSRR, and 2.2A continuous operating current low noise while offering the efficiency of a switching Input voltage range: 3.0V to 5.5V regulator. Adjustable output voltage down to 1.0V As output voltages move lower, the output noise and Output noise less than 5mV transient response of a switching regulator become an Ultra-fast transient performance increasing challenge for designers. By combining a switcher whose output is slaved to the input of a high- Unique switcher plus LDO architecture performance LDO, high efficiency is achieved with a clean Fully-integrated MOSFET switches low noise output. The MIC38300 is designed to provide Micro-power shutdown less than 5mV of peak to peak noise and over 70dB of Easy upgrade from LDO as power dissipation becomes PSRR at 1kHz. Furthermore, the architecture of the an issue MIC38300 is optimized for fast load transients that allow Thermal shutdown and current-limit protection maintenance of less than 30mV of output voltage deviation even during ultra-fast load steps, making the MIC38300 an 4mm 6mm 0.9mm MLF package ideal choice for low-voltage ASICs and other digital ICs. Applications The MIC38300 features a fully-integrated switching Point-of-load applications regulator and LDO combo, operates with input voltages from 3.0V to 5.5V input, and offers adjustable output Networking, server, industrial power voltages down to 1.0V. Wireless base-stations The MIC38300 is offered in the small 28-pin 4mm 6mm Sensitive RF applications 0.9mm MLF package and can operate from 40C to +125C. Datasheets and support documentation are available on Micrels web site at: www.micrel.com. Typical Application HELDO is a registered 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. MIC38300 Ordering Information (1) Part Number Output Current Voltage Junction Temperature Range Package MIC38300HYHL 3.0A Adjustable Pb-Free 28-Pin 4mm 6mm MLF 40 C to +125 C Note: 1. Other voltages are available. Contact Micrel for details. Pin Configuration 1 28 SWO SW SWO 2 27 SW SWO 3 26 SW 4 25 SWO SW 5 24 SWO SW SW 6 23 SW 7 ePAD 22 ePAD 8 AVIN 21 PGND 9 LPF 20 PGND AGND 10 19 PGND 11 18 EN FB 12 13 14 15 16 17 28-Pin 4mm 6mm MLF (ML) (Top View) Pin Description Pin Number Pin Name Pin Name MIC38300HYHL 1, 2, 3, 4, 5 SWO Switch (Output): This is the output of the PFM Switcher. 6, 23, 24, 25, 26, 27, 28 SW Switch Node: Attach external resistor from LPF to increase hysteretic frequency. 7, 22 ePAD Exposed heat-sink pad. Connect externally to PGND. Analog Supply Voltage: Supply for the analog control circuitry. Requires bypass capacitor 8 AVIN to ground. Nominal bypass capacitor is 1F. 9 LPF Low Pass Filter: Attach external resistor from SW to increase hysteretic frequency. 10 AGND Analog Ground. Feedback: Input to the error amplifier. Connect to the external resistor divider network to 11 FB set the output voltage. Revision 5.0 April 10, 2013 2 LDOOUT LDOOUT LDOIN LDOIN PVIN PVIN