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LM3200_05 Datasheet

  • LM3200_05

  • National Semiconductor [Miniature, Adjustable, Step-Down DC...

  • NSC

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LM3200 Miniature, Adjustable, Step-Down DC-DC Converter with Bypass Mode for RF Power
Amplifiers
November 2005
LM3200
Miniature, Adjustable, Step-Down DC-DC Converter with
Bypass Mode for RF Power Amplifiers
General Description
The LM3200 is a DC-DC converter optimized for powering
RF power amplifiers (PAs) from a single Lithium-Ion cell. It
steps down an input voltage of 2.7V to 5.5V to a variable
output voltage of 0.8V to 3.6V. The output voltage is set
using an analog input ( V
CON
) for optimizing efficiency of the
RF PA at various power levels.
The LM3200 offers superior features and performance for
mobile phones and similar RF PA applications. Fixed-
frequency PWM mode minimizes RF interference. Bypass
mode turns on an internal bypass switch to power the PA
directly from the battery. LM3200 has both forced and auto-
matic bypass modes. Shutdown mode turns the device off
and reduces battery consumption to 0.1 碌A(chǔ) (typ.). The
LM3200 is available in a 10-pin lead free micro SMD pack-
age. 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
2 MHz (typ.) PWM Switching Frequency
Operates from a single Li-Ion cell (2.7V to 5.5V)
Variable Output Voltage (0.8V to 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% Typ at 3.6V
IN
, 3.2V
OUT
at 120 mA)
from internal synchronous rectification
n
10-pin micro SMD Package
n
Current Overload Protection
n
Thermal Overload Protection
n
n
n
n
n
n
n
Applications
n
n
n
n
Cellular Phones
Hand-Held Radios
RF PC Cards
Battery Powered RF Devices
Typical Application
20126101
漏 2005 National Semiconductor Corporation
DS201261
www.national.com

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