MIC2203 _ BDTIC a Leading Distributor in China

MIC2203

The Micrel MIC2203 is a high efficiency 1MHz PWM synchronous buck switching regulator. The MIC2203 features low noise constant frequency PWM operation with a low dynamic supply current of <1mA. The low noise and efficient operation both make the MIC2203 well suited for sensitive RF, and audio power applications.

The MIC2203 operates from 2.3V to 5.5V input and can supply over 300mA of output current with output voltages down to 0.5V. Additionally, the MIC2203 can be synchronized to an external clock, or multiple MIC2203s can easily be daisy-chained with the SYNCLOCK feature.

The MIC2203 has a high loop bandwidth with corresponding ultra fast transient response times. This reduces the output capacitor size, and 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 MIC2203 is available in 10-pin MSOP and 3mm x 3mm MLF^®-10L package options with an operating junction temperature range from -40°C to 125°C.

Features

Input voltage range: 2.3V to 5.5V
Output voltage adjustable down to 0.5V
300mA output current
Constant 1MHz PWM switching frequency
> 95% efficiency
< 1mA switching supply current
< 350µA static quiescent current
< 1µA shutdown current
All-ceramic capacitors
Easily synchronized to external clock
SYNCLOCK feature to daisy chain multiple devices
Thermal shutdown and current limit protection
10-pin MSOP, and 3mm x 3mm MLF®-10L package options
-40°C to +125°C junction temperature range

Parameter

Parameter Name Value	Value
Regulator Type Step Down (Buck)	Step Down (Buck)
# of Outputs 1	1
Input Voltage Range Min (V) 2.3	2.3
Input Voltage Range Max (V) 5.5	5.5
Output Voltage Range Min (V) 0.5	0.5
Output Voltage Range Max (V) 5.5	5.5
Quiescent Current (mA) typ 0.32	0.32
Switching Frequency (kHz) 1000	1000
Synchronous Rectifier Yes	Yes
Operating Temp Range -40 to 125	-40 to 125
Vfb (V) 0.5	0.5
Duty Cycle Max (%) 1	1
SHUTDOWN Current (µA) (Typ) 0.01	0.01