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LM3204TLX Folha de dados(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LM3204TLX
Descrição Electrónicos  Miniature, Adjustable, Step-Down DC-DC Converter with Bypass Mode for RF Power Amplifiers
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3204TLX Folha de dados(HTML) 1 Page - National Semiconductor (TI)

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LM3204
Miniature, Adjustable, Step-Down DC-DC Converter with
Bypass Mode for RF Power Amplifiers
General Description
The LM3204 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 an adjustable
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 LM3204 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. LM3204 has both forced and auto-
matic bypass modes. Shutdown mode turns the device off
and reduces battery consumption to 0.1µA (typ.).
The LM3204 is available in a 10-pin lead free micro SMD
package. A high switching frequency (2MHz) allows use of
tiny surface-mount components. Only three small external
surface-mount components, an inductor and two ceramic
capacitors are required.
Features
n
2MHz (typ.) PWM Switching Frequency
n
Operates from a single Li-Ion cell (2.7V to 5.5V)
n
Adjustable Output Voltage (0.8V to 3.6V)
n
Fast Turn on time when Enabled (50µs Typ.), 3GPP
Compliant
n
300mA Maximum load capability (PWM mode)
n
500mA Maximum load capability (Bypass mode)
n
PWM, Forced and Automatic Bypass Mode
n
High Efficiency (96% Typ. at 3.6V
IN, 3.2VOUT at 120mA)
n
10-pin micro SMD Package
n
Current Overload Protection
n
Thermal Overload Protection
Applications
n
Cellular Phones
n
Hand-Held Radios
n
RF PC Cards
n
Battery Powered RF Devices
Typical Application
20138901
November 2005
© 2005 National Semiconductor Corporation
DS201389
www.national.com


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