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LM3200-LM3200TL-LM3200TLX
Miniature, Adjustable, Step-Down DC-DC Converter with Bypass Mode for RF Power Amplifiers
LM3200
Miniature, Adjustable, Step-Down DC-DC Converter with
Bypass Mode for RF Power Amplifiers
General DescriptionThe LM3200isa DC-DC converter optimizedfor powering power amplifiers (PAs) froma single Lithium-Ion cell.It
steps downan input voltageof 2.7Vto 5.5Vtoa variable
output voltageof 0.8Vto 3.6V. The output voltageis set
usingan analog input( VCON)for optimizing efficiencyofthePAat various power levels.
The LM3200 offers superior features and performancefor
mobile phones and similar RF PA applications. Fixed-
frequency PWM mode minimizes RF interference. Bypass
mode turnsonan internal bypass switchto power thePA
directly fromthe battery. LM3200 has both forced and auto-
matic bypass modes. Shutdown mode turns the deviceoff
and reduces battery consumptionto 0.1 µA (typ.). The
LM3200is availableina 10-pin lead free micro SMD pack-
age.A high switching frequency(2 MHz) allows useof tiny
surface-mount components. Only three small external
surface-mount components,an inductor and two ceramic
capacitors are required.
Features2 MHz (typ.) PWM Switching Frequency Operates froma single Li-Ion cell (2.7Vto 5.5V) Variable Output Voltage (0.8Vto 3.6V) 300 mA Maximum load capability (PWM mode) 500 mA Maximum load capability (Bypass mode) PWM, Forced and Automatic Bypass Mode High Efficiency (96% Typat 3.6VIN, 3.2VOUTat 120 mA)
from internal synchronous rectification 10-pin micro SMD Package Current Overload Protection Thermal Overload Protection
Applications Cellular Phones Hand-Held Radios RF PC Cards Battery PoweredRF Devices
Typical ApplicationNovember 2004
LM3200
Miniature,
Adjustable,
Step-Down
DC-DC
Converter
with
Bypass
Mode
for
Power
Amplifiers
