MIC2207 3mm x 3mm 2MHz 3A PWM Buck Regulator General Description Features The Micrel MIC2207 is a high-efficiency PWM buck (step- 2.7 to 5.5V supply voltage down) regulators that provides up to 3A of output current. 2MHz PWM mode The MIC2207 operates at 2MHz and has proprietary Output current to 3A internal compensation that allows a closed loop bandwidth >94% efficiency of over 200KHz. 100% maximum duty cycle The low on-resistance internal p-channel MOSFET of the MIC2207 allows efficiencies over 94%, reduces external Adjustable output voltage option down to 1V components count and eliminates the need for an Ultra-fast transient response expensive current sense resistor. Ultra-small external components The MIC2207 operates from 2.7V to 5.5V input and the Stable with a 1H inductor and a 4.7F output capacitor output can be adjusted down to 1V. The devices can Fully integrated 3A MOSFET switch operate with a maximum duty cycle of 100% for use in low- Micropower shutdown dropout conditions. Thermal shutdown and current limit protection The MIC2207 is available in the exposed pad 12-pin Pb-free 12-pin 3mm x 3mm MLF package 3mm x 3mm MLF package with a junction operating range from 40C to +125C. 40 C to +125 C junction temperature range Data sheets and support documentation can be found on Micrels web site at: www.micrel.com. Applications 5V or 3.3V Point of Load Conversion Telecom/Networking Equipment Set Top Boxes Storage Equipment Video Cards DDR Power Supply Typical Application MIC2207 3.3V Efficiency OUT 96 4.5V 94 IN 92 MIC2207 5V 90 IN 5.5V IN 88 86 84 82 80 00.5 11.5 22.5 3 3A 2MHz Buck Regulator OUTPUT CURRENT (A) 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. MIC2207 Ordering Information (1) Part Number Output Voltage Junction Temp. Range Package Lead Finish MIC2207YML Adj. 40 to +125C 12-Pin 3mm x 3mm MLF Pb-free Note: 1. Other Voltage options available. Contact Micrel for details. Pin Configuration SW 1 12 SW VIN 2 11 VIN PGND 3 10 PGND SGND 4 9 PGOOD BIAS 5 8 EN FB67EP NC 12-Pin 3mm x 3mm MLF (ML) Pin Description Pin Number Pin Name Pin Function 1,12 SW Switch (Output): Internal power P-Channel MOSFET output switch 2,11 VIN Supply Voltage (Input): Supply voltage for the source of the internal P-channel MOSFET and driver. Requires bypass capacitor to GND. 3,10 PGND Power Ground. Provides the ground return path for the high-side drive current. 4 SGND Signal (Analog) Ground. Provides return path for control circuitry and internal reference. 5 BIAS Internal circuit bias supply. Must be bypassed with a 0.1F ceramic capacitor to SGND. 6 FB Feedback. Input to the error amplifier, connect to the external resistor divider network to set the output voltage. 7 NC No Connect. Not internally connected to die. This pin can be tied to any other pin if desired. 8 EN Enable (Input). Logic level low will shutdown the device, reducing the current draw to less than 5A. 9 PGOOD Power Good. Open drain output that is pulled to ground when the output voltage is within 7.5% of the set regulation voltage EP GND Connect to ground. M9999-041910 April 2010 2