LM3207TL-2.53EV National Semiconductor, LM3207TL-2.53EV Datasheet

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LM3207TL-2.53EV

Manufacturer Part Number
LM3207TL-2.53EV
Description
BOARD EVAL LM3207 WCDMA/CDMA
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheets

Specifications of LM3207TL-2.53EV

Main Purpose
DC/DC, Step Down with LDO
Outputs And Type
1, Non-Isolated
Voltage - Output
0.8 ~ 3.6V, 2.53V
Current - Output
650mA, 10mA
Voltage - Input
2.7 ~ 5.5V
Regulator Topology
Buck
Frequency - Switching
2MHz
Board Type
Fully Populated
Utilized Ic / Part
LM3207
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-
© 2007 National Semiconductor Corporation
LM3207 Evaluation Board
Introduction
The LM3207 evaluation board is a working demonstration of
a step down DC-DC converter. This application note contains
information about the evaluation board and board layout con-
siderations. For further information on buck converter topol-
ogy, device electrical characteristics, and component selec-
tion please refer to the LM3207 datasheet.
General Description
The LM3207 is a DC-DC converter optimized for powering RF
power amplifiers (RFPAs) from a single Lithium-Ion cell, how-
ever the device may be used in many other applications. The
LM3207 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
levels and efficiency of the RF PA.
The LM3207 also provides a regulated reference voltage
(Vref) required by linear RF power amplifiers through an in-
Typical Application
CON
analog input for controlling power
202003
FIGURE 1. Typical Application Circuit
National Semiconductor
Application Note 1505
Jeffrey Colwell
July 2007
tegrated LDO with a nominal has a maximum Iref of 10 mA.
See Ordering Information table on page 2 for Voltage Options.
The LM3207 offers superior performance for powering WCM-
DA / CDMA RF power amplifiers and similar applications.
Fixed-frequency PWM operation minimizes RF interference.
Shutdown function turns the device off and reduces battery
consumption to 0.01 µA (typ).
The LM3207 is available in a 9-pin lead free micro SMD pack-
age. A high switching frequency (2 MHz) allows use of tiny
surface-mount components. Only four small external compo-
nents are required, an inductor and three ceramic capacitors.
Operating Conditions
V
V
V
I
OUT
IN
CON
OUT
range: 2.7V
range: 0 mA
equation: V
range: 0.32V
OUT
V
I
IN
OUT
= 2.5 x V
V
CON
5.5V
650 mA
1.44V
CON
www.national.com
20200306

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LM3207TL-2.53EV Summary of contents

Page 1

... CON levels and efficiency of the RF PA. The LM3207 also provides a regulated reference voltage (Vref) required by linear RF power amplifiers through an in- Typical Application © 2007 National Semiconductor Corporation National Semiconductor Application Note 1505 Jeffrey Colwell July 2007 tegrated LDO with a nominal has a maximum Iref of 10 mA. ...

Page 2

... LM3207TL-2.53 LM3207TLX-2.53 Note: The actual physical placement of the package marking will vary from part to part. The package marking “X” designates the date code. “V” NSC internal code for die traceability. Both will vary considerably. “S” designates the device type as switcher device. “34” identifies the device part number/option. ...

Page 3

Connection Diagram and Package Mark Information 9–Bump Thin Micro SMD Package, Large Bump Pin Descriptions Pin # Name A1 PV Power Supply Voltage Input to the internal PFET switch LDO Enable Input. Set this digital input high ...

Page 4

GND banana jack - black LDO Out banana jack - yellow Note 1: C3 and C4 are recommended for a better noise performance. www.national.com Manufacture Manufacture # Johnson 108-0903-001 Components Johnson 108-0907-001 Components 4 Description connector, insulated banana jack (black) ...

Page 5

Board Layout Considerations FIGURE 5. Current Loop The LM3207 converts higher input voltage to lower output voltage with high efficiency. This is achieved with an inductor- based switching topology. During the first half of the switching cycle, the internal PMOS ...

Page 6

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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