LM3202_06 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers

November 2006
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 oper-
ation 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 pack-
age. A high switching frequency (2 MHz) allows use of tiny
surface-mount components. Only three small external sur-
face-mount components, an inductor and two ceramic capac-
itors are required.
Features
■ ^{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 20µs)}
■ ^{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
■ ^{Cellular Phones}
■ ^{Hand-Held Radios}
■ ^{RF PC Cards}
■ ^{Battery Powered RF Devices}
Typical Application
FIGURE 1. LM3202 Typical Application
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