DC-DC Converter. LM3218 Datasheet

LM3218 Datasheet PDF, Equivalent


Part Number

LM3218

Description

Step-Down DC-DC Converter

Manufacture

National Semiconductor

Total Page 16 Pages
PDF Download
Download LM3218 Datasheet


LM3218 Datasheet
January 21, 2009
LM3218
650 mA Miniature, Adjustable, Step-Down DC-DC
Converter for RF Power Amplifiers
General Description
The LM3218 is a DC-DC converter with inductor which is op-
timized for powering RF power amplifiers (PAs) from a single
Lithium-Ion cell. It steps down an input voltage in the range
from 2.7V to 5.5V to an adjustable output voltage of 0.8V to
3.6V. Output voltage is set by using a VCON analog input to
control power levels and efficiency of the RF PA.
The LM3218 offers superior electrical performance for mobile
phones and similar RF PA applications with a reduced foot-
print (3mm x 2.5mm x 1.2mm). Fixed-frequency PWM oper-
ation minimizes RF interference. A shutdown function turns
the device off and reduces battery consumption to 0.01 µA
(typ.).
The LM3218 is available in an integrated inductor 8–pin LTCC
package. A high switching frequency (2 MHz typ.) allows use
of tiny surface-mount components. Only two small external
surface-mount components, two ceramic capacitors, are re-
quired. The overall board space is reduced up to 25% from
the typical discrete inductor solution.
Features
Includes 2.6 µH Inductor in very small form factor (3mm x
2.5mm x 1.2mm)
2 MHz (typ.) PWM Switching Frequency
Operates from a single Li-Ion cell (2.7V to 5.5V)
Adjustable Output Voltage (0.8V to 3.6V)
Fast Output Voltage Transient (0.8V to 3.4V in 25 µs typ.)
650 mA Maximum load capability
High Efficiency (95% typ. at 3.9 VIN, 3.4 VOUT at 400 mA)
8-pin LTCC Package
Current Overload Protection
Thermal Overload Protection
Applications
Cellular Phones
Hand-Held Radios
RF PC Cards
Battery-Powered RF Devices
Typical Application
FIGURE 1. LM3218 Typical Application
30050401
© 2009 National Semiconductor Corporation 300504
www.DataSheet.in
www.national.com

LM3218 Datasheet
Connection Diagram
NS Package Number SE08A
30050420
Order Information
Order Number
LM3218SE
LM3218SEX
Package Marking (Note)
XVS SA
XVS SA
Supplied As
250 units, Tape-and-Reel
3000 units, Tape-and-Reel
Note: The actual physical placement of the package marking will vary from part to part. The package marking “X” designates the date code. “V” is a NSC internal
code for die traceability. Both will vary in production. “S” designates device type as switcher and “SA” identifies the device (part number).
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
Name
EN
VCON
FB
SGND
VOUT
PGND
PVIN
VDD
Description
Enable Input. Set this digital input high for normal operation. For shutdown, set low.
Voltage Control Analog input. VCON controls VOUT in PWM mode.
Feedback Analog Input. Connect to the VOUT pin.
Analog and Control Ground.
Output Voltage, connects to one terminal of 2.6 µH inductor. Connect output filter capacitor C2 to get DC
voltage out.
Power Ground
Power Supply Voltage Input to the internal Buck PFET switch.
Analog Supply Input.
www.national.com
www.DataSheet.in
2


Features Datasheet pdf LM3218 650 mA Miniature, Adjustable, Ste p-Down DC-DC Converter with Integrated Inductor for RF Power Amplifiers Janua ry 21, 2009 LM3218 650 mA Miniature, A djustable, Step-Down DC-DC Converter fo r RF Power Amplifiers General Descripti on The LM3218 is a DC-DC converter with inductor which is optimized for poweri ng RF power amplifiers (PAs) from a sin gle Lithium-Ion cell. It steps down an input voltage in the range from 2.7V to 5.5V to an adjustable output voltage o f 0.8V to 3.6V. Output voltage is set b y using a VCON analog input to control power levels and efficiency of the RF P A. The LM3218 offers superior electrica l performance for mobile phones and sim ilar RF PA applications with a reduced footprint (3mm x 2.5mm x 1.2mm). Fixed- frequency PWM operation minimizes RF in terference. A shutdown function turns t he device off and reduces battery consu mption to 0.01 µA (typ.). The LM3218 i s available in an integrated inductor 8 –pin LTCC package. A high switching frequency (2 MHz typ.) allow.
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