LM3205TLEV National Semiconductor, LM3205TLEV Datasheet
LM3205TLEV
Manufacturer Part Number
LM3205TLEV
Description
BOARD EVALUATION LM3205TL
Manufacturer
National Semiconductor
Series
PowerWise®r
Specifications of LM3205TLEV
Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
0.8 ~ 3.6V
Current - Output
650mA
Voltage - Input
2.7 ~ 5.5V
Regulator Topology
Buck
Frequency - Switching
2MHz
Board Type
Fully Populated
Utilized Ic / Part
LM3205
Lead Free Status / RoHS Status
Not applicable / Not applicable
Power - Output
-
© 2006 National Semiconductor Corporation
LM3205 Evaluation Board
Introduction
The LM3205 evaluation board is a working demonstration of
a step down DC-DC converter. This application note con-
tains information about the evaluation board and board lay-
out considerations. For further information on buck converter
topology, device electrical characteristics, and component
selection please refer to the LM3205 datasheet.
General Description
The LM3205 is a DC-DC converter optimized for powering
RF power amplifiers (RFPAs) from a single Lithium-Ion cell,
however the device may be used in many other applications.
The LM3205 steps down an input voltage range from 2.7V to
5.5V to a variable output voltage range from 0.8V to 3.6V.
Output voltage is set using a V
ling power levels and efficiency of the RFPA.
Typical Application
CON
analog input for control-
AN201698
FIGURE 1. Typical Application Circuit
National Semiconductor
Application Note 1413
Haruhiko Yura
January 2006
The LM3205 offers superior performance for mobile phones
and similar RFPA applications. Fixed-frequency PWM opera-
tion minimizes RF interference. Shutdown function turns the
device off and reduces battery consumption to 0.01 µA (typ).
The LM3205 is available in a 8-pin lead free micro SMD
package. A high switching frequency (2 MHz) allows use of
tiny surface-mount components. Only three small external
components are required, an inductor and two ceramic ca-
pacitors.
Operating Conditions
•
• V
• V
• I
OUT
V
CON
OUT
IN
range: 2.7V ≤ V
range: 0 mA≤ I
equation: V
range: 0.32V ≤ V
OUT
OUT
IN
= 2.5 x V
≤ 5.5V
CON
≤ 650 mA
≤ 1.44V
CON
www.national.com
20169804
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LM3205TLEV Summary of contents
Page 1
... Output voltage is set using a V analog input for control- CON ling power levels and efficiency of the RFPA. Typical Application © 2006 National Semiconductor Corporation National Semiconductor Application Note 1413 Haruhiko Yura January 2006 The LM3205 offers superior performance for mobile phones and similar RFPA applications ...
Page 2
Evaluation Board Layout www.national.com FIGURE 2. Top Layer FIGURE 3. Bottom Layer 2 20169808 20169809 ...
Page 3
Connection Diagram and Package Mark Information 8–Bump Thin Micro SMD Package, Large Bump Pin Descriptions Pin # Name A1 PV Power Supply Voltage Input to the internal PFET switch Analog Supply Input Enable Input. ...
Page 4
... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...