MIC2202

Features:

`Input voltage range:2.3V to 5.5V
`Output down to 0.5V/600mA
`2MHz PWM operation
`Stable with 1?F ceramic output capcitor.
`Ultra-fast transient response (up to 500kHz GBW)
`Internal compensation
`All ceramic capacitors
`>95% efficiency
`Fully integrated MOSFET switches
`Easily synchronized to external clock
`SYNCLOCK feature to daisy chain multiple 2202s
`Requires only 4 external components
`1% line and load regulation
`Logic controlled micropower shutdown
`Thermal shutdown and current limit protection
`10-pin MSOP and 3mm?3mm MLF?-10L package options
`-40 to +125?C junction temperature range




Application

·Cellular phones
·PDAs
·802.11 WLAN power supplies
·FPGA/ASIC power supplies
·Dynamically adjustable power supply for CDMA/W- CDMA RF power amps
·DSL modems
·Tape drives




Pinout






Specifications

Supply Voltage (V_IN)...................................................6V
Output Switch Voltage (V_SW)......................................6V
Logic Input Voltage (V_EN, V _{SYNC_IN} )....V_IN to (R)0.3V
Power Dissipation................................................ Note 3
Storage Temperature (T_S).......................-65 to +150
ESD Rating (Note 4)...................................................2kV

Description

The Micrel MIC2202 is a high efficiency 2MHz PWM synchro- nous buck regulator. The fast 2MHz operation along with a proprietary compensation scheme allows the smallest pos- sible external components. The MIC2202 can operate with a 1F ceramic output capacitor and a small, low DC-resis- tance, 2.2?H inductor, reducing system size and cost while allowing a high level of efficiency.

The MIC2202 operates from 2.3V to 5.5V input and features internal power MOSFETs that can supply over 600mA of
output current with output voltages down to 0.5V. The MIC2202 implements a constant 2MHz pulse- width-modu- lation (PWM) control scheme which reduces noise in sensi- tive RF, audio, and communications applications. Additionally, it can be synchronized to an external clock, or multiple MIC2202s can easily be daisy-chained with the SYNCLOCK feature.

The MIC2202 has a high bandwidth loop (up to 500kHz) which allows ultra fast transient response times. This is very
useful when powering applications that require fast dynamic response such as CPU cores and RF circuitry in high performance cellular phones and PDAs.

The MIC2202 is available in 10-pin MSOP and 3mm* 3mm MLF^TM-10L package options with an operating junction
temperature range from-40 to +125 .