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LM3205 Datasheet(数据表) 1 Page - National Semiconductor (TI)

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部件型号  LM3205
说明  650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
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LM3205
May 27, 2009
650mA Miniature, Adjustable, Step-Down DC-DC Converter
for RF Power Amplifiers
General Description
The LM3205 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 0.8V(typ.) to 3.6V(typ.). Output voltage is set using a
V
CON analog input for controlling power levels and efficiency
of the RF PA.
The LM3205 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 LM3205 is available in micro SMD package and LLP
package. For all other package options contact your local
NSC sales office.
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 re-
quired.
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)
Fast Output Voltage Transient (0.8V to 3.6V in 20µs)
650mA Maximum load capability
High Efficiency (96% Typ at 4.2V
IN, 3.4VOUT at 400mA)
from internal synchronous rectification
Current Overload Protection
Thermal Overload Protection
Packages
8-Pin microSMD (Lead Free)
10-Pin LLP
Applications
Cellular Phones
Hand-Held Radios
RF PC Cards
Battery Powered RF Devices
Typical Application
20158001
FIGURE 1. LM3205 Typical Application
© 2009 National Semiconductor Corporation
201580
www.national.com




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