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LM3202 Datasheet

  • LM3202

  • 650mA Miniature, Adjustable, Step-Down DC-DC Converter for R...

  • 15頁

  • NSC

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LM3202 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers
October 2005
LM3202
650mA Miniature, Adjustable, Step-Down DC-DC
Converter for RF Power Amplifiers
General Description
The LM3202 is a DC-DC converter optimized for powering
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 1.3V to 3.16V. Output voltage is set
using a V
CON
analog input for controlling power levels and
efficiency of the RF PA.
The LM3202 offers superior performance for mobile phones
and similar RF PA applications. Fixed-frequency PWM op-
eration minimizes RF interference. Shutdown function turns
the device off and reduces battery consumption to 0.01 碌A(chǔ)
(typ.).
The LM3202 is available in a 8-pin lead free micro SMD
package. A high switching frequency (2 MHz) allows use of
tiny surface-mount components. Only three small external
surface-mount components, an inductor and two ceramic
capacitors are required.
Features
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2 MHz (typ.) PWM Switching Frequency
Operates from a single Li-Ion cell (2.7V to 5.5V)
Variable Output Voltage (1.3V to 3.16V)
Fast Output Voltage Transient (1.3V to 3.16V in 20碌s)
650mA Maximum load capability
High Efficiency (96% Typ at 3.6V
IN
, 3.16V
OUT
at 400mA)
from internal synchronous rectification
8-pin micro SMD Package
Current Overload Protection
Thermal Overload Protection
Soft Start function
Applications
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Cellular Phones
Hand-Held Radios
RF PC Cards
Battery Powered RF Devices
Typical Application
20141501
FIGURE 1. LM3202 Typical Application
漏 2005 National Semiconductor Corporation
DS201415
www.national.com

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