Features Sub-miniature 10-pin thin Micro SMD package Only four tiny surface-mount external components required Uses small ceramic capacitors Internal soft start Current and Thermal shutdown protection No external compensation required Description The LM2608 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Lithium-Ion cell. It provides up to 400mA over an input voltage range of 2.8V to 5.5V. Operating from a 1.35V reference, this device provides pin-selectable output voltages of 1.3V/1.5V (300mA) for low voltage version or 1.5V/1.8V (400mA) for high voltage version. This allows adjustment for DSP or CPU voltage options, as well as dynamic output voltage switching for reduced power consumption. Internal synchronous rectification provides high efficiency. The LM2608 offers superior features and performance for mobile phones and similar portable applications with complex power management systems. Pin-selectable PWM low-noise and linear micropower modes offer improved system control for maximizing battery life. During full power operation, fixed-frequency PWM mode reduces interference in RF and data acquisition applications by minimizing noise harmonics at sensitive IF and sampling frequencies. A SYNC input allows synchronizing the switching frequency in a range of 500kHz to 1MHz to avoid noise from intermodulation with system frequencies. Linear operation reduces quiescent current to 20µA (typ) during system standby for extended battery life. It provides up to 3 mA in the linear mode. Shutdown reduces battery consumption to 0.02µA (typ.). The LM2608 is available in a 10 pin Micro SMD package. This package uses National's wafer level chip-scale Micro SMD technology and offers the smallest possible size. A high switching frequency (600KHz) allows use of tiny surface-mount components. Only four small external surface-mount components, an inductor and three ceramic capacitors are required. Pin selectable output voltage eliminates the need for bulky external feedback resistors. Key Specification Operates from a single LiION cell (2.8V to 5.5V) Pin selectable output voltage (1.5V/1.8V or 1.3V/1.5V versions), without external feedback resistors 400mA maximum load capability ±1% PWM mode DC output voltage precision (Excluding external reference tolerance) 5mV typ PWM mode output voltage ripple 20 µA typ quiescent current (Linear Mode) 0.02µA typ shutdown mode current Internal synchronous rectification for high efficiency (91% at 2.8VIN, 1.8VOUT) 600kHz PWM mode switching frequency SYNC input for PWM mode frequency synchronization from 500kHz to 1MHz 15% accuracy for FOSC and Ilim Applications Mobile Phones Hand-Held Radios Battery Powered Devices

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

Datasheets

Title		Size	Date	Other Language
	LM2608 400mA Sub-miniature, High Efficiency, Programmable DC-DC Converter with Linear Mode	728 Kbytes	1-Oct-03

Other Technical Documents

Title		Type	Date
	Sub-Miniature Buck Converters Tailored For Portable Power Applications	App Note	2003-03-06

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM2608ATLX-1.8/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.49 each at 1K+ pcs	reel of 3000

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM2608ABL-1.8	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM2608ABLX-1.8	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM2608ATL-1.3	LM8801	National Semiconductor	30 Nov 2009
LM2608ATLX-1.3	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008

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 LM2608.

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 LM2608 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
LM2608ATLX-1.8/NOPB	5.594	MICRO SMD	10	1	260	Detail	Download	N/A	XYTT I S44A

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 LM2608.

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 LM2608 is located at RoHS Status.

CAD Symbols and Models Download LM2608 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2608ATLX-1.8	ABCD150	0	42680	0	0	6394000	1	1814314958

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 LM2608.

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 LM2608 is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM2608ABL-1.8	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM2608ABLX-1.8	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM2608ATL-1.3	LM8801	National Semiconductor	30 Nov 2009
LM2608ATLX-1.3	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008