Features • Regulated current sources with ±0.5% matching between any two outputs • High efficiency 3/2 boost function • Drives one, two, three or four white LEDs • 2.7V to 5.5V Input Voltage • Up to 80mA output current • Analog brightness control • Active-low or high shutdown input ('94/95) • Very small solution size and no inductor • 2.3µA (typ.) shutdown current • 325kHz switching frequency (min.) • Constant Frequency generates predictable noise spectrum • Standard Micro SMD-14 package: 2.08mm X 2.403mm X 0.845mm High • Thin Micro SMD-14 package: 2.08mm X 2.403mm X 0.600mm High Description The LM2794/95 is a fractional CMOS charge-pump that provides four regulated current sources. It accepts an input voltage range from 2.7V to 5.5V and maintains a constant current determined by an external sense resistor. The LM2794/5 delivers up to 80mA of load current to accommodate four White LEDs. The switching frequency is 325kHz. (min.) to keep the conducted noise spectrum away from sensitive frequencies within portable RF devices. Brightness can be controlled by both linear and PWM techniques. A voltage between 0V and 3.0V may be applied to the BRGT pin to linearly vary the LED current. Alternatively, a PWM signal can be applied to the SD pin to vary the perceived brightness of the LED. The SD pin reduces the operating current to 2.3µA (typ.) The LM2794 is shut down when the SD pin is low, and the LM2795 is shut down when the SD pin is high. The LM2794/95 is available in a micro SMD-14 CSP package. Applications • White LED Display Backlights • White LED Keypad Backlights • 1-Cell Li-Ion battery-operated equipment including PDAs, hand-held PCs, cellular phones

Also Recommended LM2796▲ Drives 7 LEDs LM27966▲ Advanced Brightness Control With 12C Interface, Higher Efficiency With Adaptive Gain Charge Pump LM2793▲ Drives 2 LEDs, LLP LM2795▲ Active-High Shutdown Pin LM3595▲ No Boost, LLP 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
	LM2794/LM2795 Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control	487 Kbytes	22-Mar-04	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-1251: Application Note 1251 Switched Capacitor Circuits Provide Efficient and Functional White LED Drive	55 Kbytes	26-Sep-02
	AN-1218: Application Note 1218 LM2791/2/4/5 Evaluation Board	424 Kbytes	13-May-04

More Application Notes

Title		Size	Date	Other Language
	AN-1321: Application Note 1321 LM2796 Evaluation Board	453 Kbytes	25-May-04
	AN-1278: Application Note 1278 LM2793 Evaluation Board	213 Kbytes	23-Mar-04

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM2794TL/NOPB RoHS		Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 0 RS COMPONENTS Worldwide 196	$0.76 each at 1K+ pcs	reel of 250
LM2794TLX/NOPB RoHS		Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 0 KEIKONG Asia Pacific 48000	$0.76 each at 1K+ pcs	reel of 3000

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM2794BL	NONE	NATIONAL SEMICONDUCTOR	24 Jul 2009
LM2794BLX	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2794TL	CS065	2	38968	52	0	4402000	1	1249079519
LM2794TLX	CS065	2	38968	52	0	4402000	1	1249079519

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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Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM2794BL	NONE	NATIONAL SEMICONDUCTOR	24 Jul 2009
LM2794BLX	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008