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

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Datasheet

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

Featured Application Notes

Title		Size	Date	Other Language
	AN-1392: Application Note 1392 LM3485 LED Demo Board	569 Kbytes	7-Jun-06	中文
	AN-161: Application Note 161 IC Voltage Reference has 1 ppm per Degree Drift	138 Kbytes	10-Oct-02
	AN-1461: Application Note 1461 LMH6321 (PSOP and TO-263) Single Open Loop High Speed Buffer Evaluation Boards	6341 Kbytes	27-Nov-06	中文

More Application Notes

Title		Size	Date	Other Language
	AN-161: Application Note 161 IC Voltage Reference has 1 ppm per Degree Drift	138 Kbytes	10-Oct-02
	AN-1392: Application Note 1392 LM3485 LED Demo Board	569 Kbytes	7-Jun-06	中文
	AN-1461: Application Note 1461 LMH6321 (PSOP and TO-263) Single Open Loop High Speed Buffer Evaluation Boards	6341 Kbytes	27-Nov-06	中文

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3218SEE	CMOS7	0	18406	0	0	1089000	4	309006723
LM3218SEX	CMOS7	0	18406	0	0	1089000	4	309006723

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.

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