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LM3243 Datasheet(PDF) 15 Page - Texas Instruments

Part # LM3243
Description  LM3243 High-Current Step-Down Converter for 2G, 3G, and 4G RF Power Amplifiers
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM3243 Datasheet(HTML) 15 Page - Texas Instruments

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LM3243
PVIN VDD
SW
FB
VCON
PGND SGND
EN
MODE
VBATT
VOUT
ACB
BP
VCC_PA_2G
BB or
RFIC
DAC
GPO2
GPO1
BGND
1.5 µH
10 µF
1.0 µF
PA
4.7 µF
PA(s)
VCC_PA_3G
10 µF
LM3243
www.ti.com
SNVS782C – OCTOBER 2010 – REVISED AUGUST 2015
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LM3243 DC-DC converter steps down an input voltage from 2.7 V to 5.5 V to a dynamically adjustable
output voltage of 0.4 V to 3.6 V.
8.2 Typical Application
Figure 17. LM3243 Typical Application
8.2.1 Design Requirements
For typical step-down converter applications, use the parameters listed in Table 2.
Table 2. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Input voltage
2.7 V to 5.5 V
Minimum output voltage
0.4 V to 3.6 V
Output current range
0 to 2.5 A
8.2.2 Detailed Design Procedure
8.2.2.1 Inductor Selection
A 1.5 µH inductor is needed for optimum performance and functionality of the LM3243. In the case of 2G
transmission current bursts, the effective overall RMS current requirements are reduced. Therefore, please
consult with the inductor manufacturers to determine if some of their smaller components will meet your
application needs even though the classical inductor specification does not appear to meet the LM3243 RMS
current specifications.
LM3243 automatically manages the inductor peak and RMS (or steady current peak) current through the SW pin.
The SW pin has two positive current limits. The first is the 1.45 A typical (or 1.65 A maximum.) over-limit current
protection. It sets the upper steady-state inductor peak current (as detailed in the Electrical Characteristics Table
- ILIM,PFET,SteadyState). It is the dominant factor limiting the inductor's ISAT requirement. The second is a over-limit
current protection. It limits the maximum peak inductor current during large signal transients (that is, < 20 µs) to
1.9 A typical (or 2.1 A maximum). A minimum inductance of 0.3 µH should be maintained at the second current
limit.
Copyright © 2010–2015, Texas Instruments Incorporated
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