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 LM2794▲ Active-Low Shutdown Pin LM3595▲ No Boost, LLP

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

Parameters / Values	LM2795	LM2796	LM27966	LM2793	LM2794	LM3595
Regulated LEDs	4	7	6		4
Total LED Current	80 mA	140 mA	180 mA		80 mA
Current Matching	0.5%	1%	0.3%		0.5%
Boost Type	Switched Capacitor 1.5x	Switched Capacitor 1.5x	Switched Capacitor Multi-Gain		Switched Capacitor 1.5x
Switching Frequency	515 kHz	500 kHz	1270 kHz		515 kHz
Efficiency (peak)	80 %	80 %	91 %		80 %
Input Min Voltage	2.7 Volt	2.7 Volt	2.7 Volt		2.7 Volt
Input Max Voltage	5.5 Volt	5.5 Volt	5.5 Volt		5.5 Volt
Boost Voltage	Unregulated	Unregulated	Regulated		Unregulated
LED Configuration	Parallel	Parallel	Parallel		Parallel
Supply Current	5.5 mA	3.5 mA	2.9 mA		5.5 mA
Switching Type	Fixed Freq	Fixed Freq	Fixed Freq		Fixed Freq
Special Features	Active high shutdown	LEDs controlled in 2 groups: 3 and 4 LEDs; softstart	Current regulated outputs, Common anode current sink topology, I2C compatible interface		Active low shutdown
PWM BrightCtrl	Yes	Yes	Yes		Yes
Analog-V BrightCtrl	Yes	No	Yes		Yes
Ambient Light Compensation	No	No	No		No
RGB-LED	No	No	No		No
Temperature Min	-30 deg C	-30 deg C	-30 deg C		-30 deg C
Temperature Max	85 deg C	85 deg C	85 deg C		85 deg C
RegType	WhiteLED Driver	WhiteLED Driver	WhiteLED Driver		WhiteLED Driver
PowerWise	No	Yes	Yes		No

Datasheets

Title		Size	Date	Other Language
	LM2795 Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control	487 Kbytes	22-Mar-04	日本語

Application Notes

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

Other Technical Documents

Title		Type	Date
	Switched Capacitor Circuits Provide Efficient and Functional White-LED Drive	App Note	2003-03-06

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM2795TLX/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.04 each at 1K+ pcs	reel of 3000

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM2795BLX	NONE	NATIONAL SEMICONDUCTOR	24 Jul 2009

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 LM2795.

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 LM2795 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM2795EVAL	Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control	Full production	Distributor Region Qty DIGI-KEY Worldwide 0	$81.00 each	1
Description: A current regulated Switched Capacitor LED Supply with Analog Brightness Control Features: Regulated IOUT with plus or minus 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 Soft start limits inrush current Analog brightness control Active-low or high shutdown input ('94/95) Very small solution size and no inductor 5 microA (max.) shutdown current 325kHz switching frequency (min). Linear regulation gneerates predictable noise spectrum micro SMD-14 package: 2.08mm X 2.403mm X 0.845mm Applications: White LED Display Backlights White LED Keypad Backlights 1-Cell Li-Ion battery-operated equipment including PDAs, hand-held PCs, cellular phones Flat Panel Displays

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM2795TLX/NOPB	5.573 5.772	MICRO SMD	14	1	260	Detail	Download	N/A	XYTT I LOJ

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 LM2795.

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 LM2795 is located at RoHS Status.

CAD Symbols and Models Download LM2795 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2795TLX	CS065	2	47473	43	0	5527000	1	1568301341

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 LM2795.

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 LM2795 is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM2795BLX	NONE	NATIONAL SEMICONDUCTOR	24 Jul 2009