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LM3207 Datasheet(Fiches technique) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numéro de pièce LM3207
Description  650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers with Integrated Vref LDO
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
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LM3207
650mA Miniature, Adjustable, Step-Down DC-DC
Converter for RF Power Amplifiers with Integrated Vref
LDO
General Description
The LM3207 is a DC-DC converter optimized for powering
WCDMA / CDMA RF power amplifiers (PAs) from a single
Lithium-Ion cell; however they may be used in many other
applications. It steps down an input voltage from 2.7V to
5.5V to a variable output voltage from 0.8V(typ.) to
3.6V(typ.). Output voltage is set using a V
CON analog input
for controlling power levels and efficiency of the RF PA.
The LM3207 also provides a regulated reference voltage(V-
ref) required by linear RF power amplifiers through an inte-
grated LDO with a nominal output voltage of 2.875V and
maximum Iref of 10 mA.
The LM3207 is available in a 9-pin lead free micro SMD
package. High switching frequency (2MHz) allows use of
surface-mount
components.
Only
four
small
external
surface-mount components are required, an inductor and
three ceramic capacitors.
Features
n
2MHz (typ.) PWM Switching Frequency
n
Operates from a single Li-Ion cell (2.7V to 5.5V)
n
Variable Output Voltage (0.8V to 3.6V)
n
650mA Maximum load capability
n
High Efficiency (95% Typ at 3.9V
IN, 3.4VOUT at 400mA)
from internal synchronous rectification
n
Integrated 2.875V Vref LDO
n
Regulated LDO Output up to 10mA max
n
Fast 3uS Vref LDO On/Off Time
n
9-pin micro SMD Package
n
Current Overload Protection
n
Thermal Overload Protection
Applications
n
Cellular Phones
n
Hand-Held Radios
n
RF PC Cards
n
Battery Powered RF Devices
Typical Application
20165301
FIGURE 1. LM3207 Typical Application
August 2006
© 2006 National Semiconductor Corporation
DS201653
www.national.com




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