LM3202 Datasheet, PDF (1/15 Pages) National Semiconductor (TI) – 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 µA
(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
n 2 MHz (typ.) PWM Switching Frequency
n Operates from a single Li-Ion cell (2.7V to 5.5V)
n Variable Output Voltage (1.3V to 3.16V)
n Fast Output Voltage Transient (1.3V to 3.16V in 20µs)
n 650mA Maximum load capability
n High Efficiency (96% Typ at 3.6V_IN, 3.16V_OUT at 400mA)
from internal synchronous rectification
n 8-pin micro SMD Package
n Current Overload Protection
n Thermal Overload Protection
n Soft Start function
Applications
n Cellular Phones
n Hand-Held Radios
n RF PC Cards
n Battery Powered RF Devices
Typical Application
FIGURE 1. LM3202 Typical Application
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