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LM3204TL Datasheet

  • LM3204TL

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

  • NSC

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LM3204 Miniature, Adjustable, Step-Down DC-DC Converter with Bypass Mode for RF Power
Amplifiers
November 2005
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 0.1碌A(chǔ) (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
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2MHz (typ.) PWM Switching Frequency
Operates from a single Li-Ion cell (2.7V to 5.5V)
Adjustable Output Voltage (0.8V to 3.6V)
Fast Turn on time when Enabled (50碌s Typ.), 3GPP
Compliant
300mA Maximum load capability (PWM mode)
500mA Maximum load capability (Bypass mode)
PWM, Forced and Automatic Bypass Mode
High Efficiency (96% Typ. at 3.6V
IN
, 3.2V
OUT
at 120mA)
10-pin micro SMD Package
Current Overload Protection
Thermal Overload Protection
Applications
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Cellular Phones
Hand-Held Radios
RF PC Cards
Battery Powered RF Devices
Typical Application
20138901
漏 2005 National Semiconductor Corporation
DS201389
www.national.com

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