MIC2206-1.8YML-EV

MIC2206 2MHz PWM Synchronous Buck Regulator with LOWQ Mode and Voltage Scaling General Description Features The Micrel MIC2206 is a high efficiency 2MHz PWM 2.7 to 5.5V supply voltage synchronous buck (step-down) regulator that Light load LOWQ LDO mode features a LOWQ LDO standby mode that draws 18A quiescent current only 18A of quiescent current. The MIC2206 Low noise, 75Vrms allows an ultra-low noise, small size, and high 2MHz PWM mode efficiency solution for portable power applications. Output current to 600mA In PWM mode, the MIC2206 operates with a constant frequency 2MHz PWM control. Under light >95% efficiency load conditions, such as in system sleep or standby 100% maximum duty cycle modes, the PWM switching operation can be Output Voltage Scaling (1V output in LOWQ disabled to reduce switching losses. In this light Mode) load LOWQ mode, the LDO maintains an output Ultra-fast transient response voltage of 1V and draws only 18A of quiescent Stable with 1F ceramic output capacitor current. The LDO mode of operation saves battery life while not introducing spurious noise and high Fully integrated MOSFET switches ripple as experienced with pulse skipping or bursting Micropower shutdown mode regulators. Thermal shutdown and current limit protection The MIC2206 operates from 2.7V to 5.5V input and Pb-free 3mm x 3mm MLF-10L package features internal power MOSFETs that can supply 40C to +125C junction temperature range up to 600mA output current in PWM mode. It can operate with a maximum duty cycle of 100% for use in low-dropout conditions. Applications The MIC2206 is available in the 3mm x 3mm MLF- Cellular phones 10L package with a junction operating range from PDAs 40C to +125C. USB peripherals Data sheets and support documentation can be found on Micrels web site at www.micrel.com. Typical Application MIC2206 VIN LDO 2.2H V OUT AVIN SW 1.8V/600mA V IN C C EN FB IN OUT Li Ion 100pF 4.7F 2.2F Battery LOWQ PGND Ceramic BIAS AGND 0.1F Fixed Output Buck Regulator with LOWQ Mode LOWQ is a 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. MIC2206 Ordering Information (1) Part Number Output Voltage Junction Temp. Range Package (Pb-Free) (PWM/LDO) MIC2206-1.8YML 1.8V/1.0V 40 to +125C 3x3 MLF-10L MIC2206-1.2YML 1.2V/1.0V 40 to +125C 3x3 MLF-10L Note: 1. Other Voltage options available. Contact Micrel for details. Pin Configuration AGND 1 10 PGND LDO 2 9 SW BIAS 3 8 VIN AVIN 4 7 LOWQ FB 5 EP 6 EN 3mm x 3mm MLF-10L (ML) Pin Description Pin Number Pin Name Pin Function 1 AGND Analog (signal) Ground. 2 LDO LDO Output (Output): Connect to V for LDO mode operation. OUT 3 BIAS Internal circuit bias supply. Must be de-coupled to signal ground with a 0.1F capacitor and should not be loaded. 4 AVIN Analog Supply Voltage (Input): Supply voltage for the analog control circuitry and LDO input power. Requires bypass capacitor to GND. 5 FB Feedback. Input to the error amplifier and internal feedback resistors. Place a 100pF ceramic capacitor from FB to the output. 6 EN Enable (Input). Logic low will shut down the device, reducing the quiescent current to less than 5A. Enable LDO Mode (Input): Logic low enables the internal LDO and disables the 7 LOWQ PWM operation. Logic high enables the PWM mode and disables the LDO mode. 8 VIN Supply Voltage (Input): Supply voltage for the internal switches and drivers. 9 SW Switch (Output): Internal power MOSFET output switches. 10 PGND Power Ground. EP GND Ground, backside pad. M9999-102105 October 2005 2 www.micrel.com