Converter with DAC Input and 40m鈩?/div>
Bypass Switch
Preliminary
General Description
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, 40m鈩? 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 V
OUT
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
鈥?0擄C to +125擄C and is available in a 3mm x 3mm
MLF
TM
-10L package.
Features
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
2.7V to 5.5V input voltage range
DAC-adjustable output voltage down to 0.3V
600mA output current in PWM mode
Internally protected 40m鈩?bypass switch
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
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
<1碌A(chǔ) shutdown current
Under-voltage lockout
Thermal shutdown and current limit
protection
鈥?0擄C to +125擄C junction temperature range
Applications:
鈥?/div>
鈥?/div>
Cellular phones
PDAs
____________________________________________________________________________________________________
Typical Application
MIC2224
2, 3
5
V
IN
2.6V to 5.5V
L1
4.7碌H
SW
1
8, 9
VIN
AVIN
ENABLE
DAC
AGND
V
OUT
VOUT
C1
1碌F
DAC
4
6
C2
1碌F
PGND
10
GND
7
GND
2MHz PWM Converter with DAC input and 40m
鈩?/div>
Bypass Switch
Micrel, Inc. 鈥?2180 Fortune Drive 鈥?San Jose, Ca 95131 鈥?USA 鈥?tel +1 (408) 944-0800 鈥?fax +1 (408) 474-1000 鈥?http://www.micrel.com
2005January 2005
M9999-012705
www.micrel@micrel.com
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