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LM2793  Product Folder

Low Noise White LED Constant Current Supply with Dual Function Brightness Control
Generic P/N 2793
General
Description		 Features Datasheet Package
& Models		 Samples
& Pricing		 Reliability
Metrics

Parametric Table Parametric Table
Temperature Min (deg C) -30 
Temperature Max (deg C) 85 
Total LED Current (mA) 32 
LED Configuration Parallel 
Regulated LEDs () 2 
Current Matching .3% 
Boost Type Switched Capacitor 1.5x 
Boost Voltage Unregulated 
Efficiency (%) 85 
Supply Current (mA) 1.20 
Switching Frequency (Hz) 500000 
Switching Type Fixed Freq. 
InputMin Voltage (Volt) 2.70 
InputMax Voltage (Volt) 5.50 
OutputMax Voltage (Volt) - 
PWM BrightCtrl Yes 
Analog-V BrightCtrl Yes 
AmbientLight Compensation - 
RGB-LED No 

Datasheet

TitleSize in KbytesDate
View Online
Download
Receive via Email
LM2793 Low Noise White LED Constant Current Supply with Dual Function Brightness Control 211 Kbytes 21-Feb-03 View Online Download Receive via Email

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Package Availability, Models, Samples & Pricing

Part NumberPackageStatusModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
TypePinsMSL/Lead-Free AvailabilityLead
Time		QtySPICEIBISQty$US each
LM2793LDLLP10StatusFull productionN/AN/ASamples1K+$1.22reel
of
1000		ZXYTT
L2793
10-12 weeks100000
LM2793LDXLLP10StatusFull productionN/AN/A 1K+$1.22reel
of
4500		ZXYTT
L2793
11-12 weeks100000

General Description

The LM2793 is a highly efficient, semi-regulated 1.5x CMOS charge pump that provides dual constant current outputs. The LM2793 has an input voltage range of 2.7V to 5.5V.

To control LED brightness, the amount of current driven to the current-mode outputs can be adjusted with an analog voltage and/or a pulse-width-modulated (PWM) square wave.

Pre-regulation of the charge pump minimizes conducted noise on the input. Combined with a fixed switching frequency of 500kHz, the LM2793 is a low-noise solution.

The LM2793 is available in a 10-pin Leadless Lead-frame package: LLP-10.

Features

  • Two Regulated Current Outputs, up to 16mA Each, Matched to Within ±0.3% (typ.)
  • High Efficiency, 1.5× Regulated Charge Pump
  • Input Voltage Range: 2.7V to 5.5V
  • Soft Start Limits Inrush Current
  • Analog Voltage Brightness Control
  • PWM Brightness Control
  • Very Small Solution Size - NO INDUCTOR
  • 500kHz Switching Frequency
  • 3µA (typ.) Shutdown Current
  • LLP-10 Package: 3.0mm X 3.0mm X 0.8mm

Applications

  • White LED Display Backlights
  • White LED Keypad Backlights
  • 1-Cell LiIon Battery-Operated Equipment Including PDAs, Hand-held PCs, Cellular Phones
  • Flat Panel Displays

Reliability Metrics

Part Number Process Early Failure Rate - Rejects Sample Size (EFR) PPM * Rel. Rejects Device Hours Long Term Failure Rates (FITS) MTTF
LM2793LDCS06508800006000006169643205
LM2793LDXCS06508800006000006169643205

For more information on Reliablitity Metrics, please click here.


[Information as of 15-Jan-2004]

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