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LM3218 Folha de dados(PDF) 1 Page - Texas Instruments

Nome de Peças LM3218
Descrição Electrónicos  Miniature, Adjustable, Step-Down DC-DC Converter
Download  21 Pages
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

LM3218 Folha de dados(HTML) 1 Page - Texas Instruments

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FB
EN
VDD
VIN
0.8V to 3.6V
SGND
GND
LM3218
VOUT = 2.5 x VCON
VIN
COUT
CIN
GND
VOUT
Integrated Inductor
LM3218
VCON
LM3218
www.ti.com
SNOSB11B – MARCH 2008 – REVISED MARCH 2013
LM3218 650 mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power
Amplifiers
Check for Samples: LM3218
1
FEATURES
DESCRIPTION
The LM3218 is a DC-DC converter with inductor
2
Includes 2.6 µH Inductor in Very Small Form
which is optimized for powering RF power amplifiers
Factor (3mm x 2.5mm x 1.2mm)
(PAs) from a single Lithium-Ion cell. It steps down an
2 MHz (typ.) PWM Switching Frequency
input voltage in the range from 2.7V to 5.5V to an
Operates from a Single Li-Ion Cell (2.7V to
adjustable output voltage of 0.8V to 3.6V. Output
voltage is set by using a VCON analog input to control
5.5V)
power levels and efficiency of the RF PA.
Adjustable Output Voltage (0.8V to 3.6V)
The LM3218 offers superior electrical performance for
Fast Output Voltage Transient (0.8V to 3.4V in
mobile phones and similar RF PA applications with a
25 µs typ.)
reduced footprint (3mm x 2.5mm x 1.2mm). Fixed-
650 mA Maximum Load Capability
frequency PWM operation minimizes RF interference.
High Efficiency (95% typ. at 3.9 VIN, 3.4 VOUT at
A shutdown function turns the device off and reduces
400 mA)
battery consumption to 0.01 µA (typ.).
8-pin POS Package
The LM3218 is available in an integrated inductor
Current Overload Protection
8–pin POS package. A high switching frequency (2
MHz
typ.)
allows
use
of
tiny
surface-mount
Thermal Overload Protection
components. Only two small external surface-mount
components, two ceramic capacitors, are required.
APPLICATIONS
The overall board space is reduced up to 25% from
Cellular Phones
the typical discrete inductor solution.
Hand-Held Radios
RF PC Cards
Battery-Powered RF Devices
TYPICAL APPLICATION
Figure 1. LM3218 Typical Application
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2008–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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