LM2614

The LM2614 DC-DC converter is optimized for powering RF power amplifiers (PAs) from a single Lithium-Ion cell. It steps down an input voltage of 2.8V to 5.5V to an output of 1.0V to 3.6V at up to 400mA (300mA for B grade). Output voltage is set using an analog input to VCON in the application circuit.

The device offers three modes for mobile phones and similar RF PA applications. Fixed-frequency PWM mode minimizes RF interference. A SYNC input allows synchronizing the switching frequency in a range of 500kHz to 1MHz. Low current hysteretic PFM mode reduces quiescent current to 160µA (typ.). Shutdown mode turns the device off and reduces battery consumption to 0.02µA (typ.).

Current limit and thermal shutdown features protect the device and system during fault conditions.

The LM2614 is available in a 10 bump micro SMD package. This packaging uses National's chip-scale micro SMD technology and offers the smallest possible size. A high switching frequency (600kHz) allows use of tiny surface-mount components.

The LM2614 can be dynamically controlled for output voltage changes from 1.0V to 3.6V in <30µs. The device features external compensation to tailor the response to a wide range of operating conditions.

Reliability Metrics

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Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2614ATL	ABCD150	0	31520	0	0	3739000	1	1060951459
LM2614ATLX	ABCD150	0	31520	0	0	3739000	1	1060951459

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.

More Application Notes

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Title	Size in Kbytes	Date
AN-87: Application Note 87 Comparing the High Speed Comparators	249 Kbytes	1-Oct-02	Download
AN-1203: Application Note 1203 LM2611 Demoboard	120 Kbytes	10-May-04	Download

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