MIC2224 _ BDTIC a Leading Distributor in China

MIC2224

The MIC2224 is a high efficiency 2MHz PWM synchronous buck switching regulator optimized for powering 2.5G and 3G CDMA RF Power Amplifiers. The output voltage of MIC2224 can be dynamically adjusted with an external DAC to maximize PA efficiency versus required output power. When the PA requires the highest power, the DAC can be used to enable a low on-resistance, 40mΩ, bypass switch that powers the PA directly from the battery.

The 2MHz PWM operation of MIC2224 allows the smallest possible components. It also allows the device to easily meet stringent W-CDMA VOUT response specifications.

The MIC2224 operates from a 2.7V to 5.5V input, making it ideal for single cell Li-Ion applications. The device features built-in power MOSFETs that can supply up to 600mA of output current in PWM mode, or over 1A in bypass mode. The MIC2224 can operate with a maximum duty cycle of 100% for use in low-dropout conditions.

The MIC2224 has a junction temperature range of –40°C to +125°C and is available in a 3mm x 3mm MLFTM-10L package.

Features

2.7V to 5.5V input voltage range
DAC-adjustable output voltage down to 0.3V
600mA output current in PWM mode
Internally protected 40mΩ bypass switch
Allows direct connection of battery to load
Over 95% efficient
Fully integrated MOSFET switches
Constant 2MHz PWM operation
Internal soft-start
1% line and load regulation
<1µA shutdown current
Under-voltage lockout
Thermal shutdown and current limit protection
–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) 2.7	2.7
Input Voltage Range Max (V) 5.5	5.5
Output Voltage Range Max (V) 5.5	5.5
Output Current (A) max 1	1
Quiescent Current (mA) typ 0.36	0.36
Switching Frequency (kHz) 2000	2000
Synchronous Rectifier Yes	Yes
Operating Temp Range -40 to 125	-40 to 125
Duty Cycle Max (%) 1	1
SHUTDOWN Current (µA) (Typ) 1	1