1.25A Miniature, Adjustable, Step-Down DC-DC Converter
for RF Power Amplifiers
General Description
Features
The LM3210 is a DC-DC converter optimized for powering RF
power amplifiers (PAs) from a single Lithium-Ion cell. However, it may be used in many other applications. It steps down
an input voltage in the range from 2.7V to 5.5V to an adjustable output voltage of 0.5V to 3.6V. Output voltage is set
by using a VCON analog input to control power levels and efficiency of the RF PA.
The LM3210 offers superior performance for mobile phones
and similar RF PA applications. Fixed-frequency PWM operation minimizes RF interference. A shutdown function turns
the device off and reduces battery consumption to 0.01 µA
(typ.).
Only three small external surface-mount components, an inductor and two ceramic capacitors, are required.
Notice: This document is not a full datasheet. For more
information regarding this product or to order samples
please contact your local National Semiconductor sales
office or visit http://www.national.com/support/dir.html
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Operates from a single Li-Ion cell (2.7V to 5.5V)
Adjustable Output Voltage (0.5V to 3.6V)
Fast Output Voltage Transient (0.5V to 2.7V in 30 µs max)
1.25A Maximum load capability
High Efficiency
Current Overload Protection
Thermal Overload Protection
Applications
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Cellular Phones
Hand-Held Radios
RF PC Cards
Battery Powered RF Devices
Typical Applications
30024902
30024934
© 2009 National Semiconductor Corporation
300249
www.national.com
LM3210 – PRODUCT BRIEF
June 1, 2009
LM3210
PRODUCT BRIEF
