Features • Ultra high efficiencies (95% possible) • High efficiency over a 3A to milliamperes load range • Synchronous switching of internal NMOS power FETs • Wide input voltage range (4.5V to 18V) • Output voltage adjustable from 1.5V to 16V • Automatic low-power sleep mode • Logic-controlled micropower shutdown (IQSD < 25 µA) • Frequency adjustable up to 300 kHz • Frequency synchronization with external signal • Programmable soft-start • Short-circuit current limiting • Thermal shutdown • Available in 24-lead Small-Outline package Description The LM2650 is a step-down DC/DC converter featuring high efficiency over a 3A to milliamperes load range. This feature makes the LM2650 an ideal fit in battery-powered applications that demand long battery life in both run and standby modes. The LM2650 also features a logic-controlled shutdown mode in which it draws at most 25µA from the input power supply. The LM2650 employs a fixed-frequency pulse-width modulation (PWM) and synchronous rectification to achieve very high efficiencies. In many applications, efficiencies reach 95%+ for loads around 1A and exceed 90% for moderate to heavy loads from 0.2A to 2A. A low-power hysteretic or "sleep" mode keeps efficiencies high at light loads. The LM2650 enters and exits sleep mode automatically as the load crosses "sleep in" and "sleep out" thresholds. The LM2650 provides nodes for programming both thresholds via external resistors. A logic input allows the user to override the automatic sleep feature and keep the LM2650 in PWM mode regardless of the load level. An optional soft-start feature limits current surges from the input power supply at start up and provides a simple means of sequencing multiple power supplies. Applications • Notebook and palmtop personal computers • Portable data terminals • Modems • Portable Instruments • Global positioning devices (GPSs) • Battery-powered digital devices

Also Recommended LM25576▲ 3A Integrated Switching Converter With 42V Max Input Voltage LM2679▲ 5A 40V Integrated Buck Regulator LM2853▲ 3A Integrated Synchronous Buck For Low Voltage Applications LM3100▲ 36V 1.5A Integrated Synchronous Buck Regulator LM5576▲ 3A Integrated Buck Regulator With 75V Input Capability MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

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

Datasheet

Title		Size	Date	Other Language
	LM2650 Synchronous Step-Down DC/DC Converter	215 Kbytes	1-Nov-00	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-1071: Application Note 1071 Information About the LM2650 Evaluation Board Rev. 1	105 Kbytes	4-Oct-04	日本語

More Application Notes

Title		Size	Date	Other Language
	AN-1143: Application Note 1143 LM2651_3.3V_EVAL 1.5A High Efficiency Synchronous Switching Regulator Evaluation Board	150 Kbytes	24-Jul-08
	AN-1147: Application Note 1147 LM2651_EVAL 1.5A High Efficiency Synchronous Switching Regulator Evaluation Board	149 Kbytes	2-Oct-07
	AN-1133: Application Note 1133 LM2653EVAL 1.5A Synchronous Switching Regulator Evaluation Board	76 Kbytes	4-Oct-04
	AN-1215: Application Note 1215 LM2655 2.5A Synchronous Switching Regulator Evaluation Board	307 Kbytes	10-May-04
	AN-1520: Application Note 1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages	2176 Kbytes	7-Sep-06	中文

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2650M-ADJ	LMDMOS	0	17710	0	0	2470000	2	700869244
LM2650MX-ADJ	LMDMOS	0	17710	0	0	2470000	2	700869244

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.