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 Description The LM3218 is a DC-DC converter with inductor which is optimized 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 footprint (3mm x 2.5mm x 1.2mm). Fixed-frequency PWM operation 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 required. The overall board space is reduced up to 25% from the typical discrete inductor solution. Applications Cellular Phones Hand-Held Radios RF PC Cards Battery-Powered RF Devices

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LM3218 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers	4301 Kbytes	21-Jan-09

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM3218SEE/NOPB RoHS Status	POS	Full production Lead Time: 12 weeks	Distributor Region Qty ARROW Worldwide 1750 AVNET-EM Worldwide 250 DIGI-KEY Worldwide 532 MOUSER Worldwide 500 TAYLOR Americas 1750	$1.20 each at 1K+ pcs	reel of 250
LM3218SEX/NOPB RoHS Status	POS	Full production Lead Time: 12 weeks	Distributor Region Qty AVNET-EM Worldwide 3000 DIGI-KEY Worldwide 0	$1.20 each at 1K+ pcs	reel of 3000

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM3218.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM3218 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM3218SEE/NOPB	33.518	POS	8	3	260	Detail	N/A	N/A	-
LM3218SEX/NOPB	33.518	POS	8	3	260	Detail	N/A	N/A	-

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM3218.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM3218 is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3218SEE	CMOS7	0	21301	0	0	1584000	3	449464325
LM3218SEX	CMOS7	0	21301	0	0	1584000	3	449464325

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM3218.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM3218 is located at RoHS Status.