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LM2796

Features: ·Drives up to 7 LEDs with up to 20mA each·LEDs controlled in 2 Distinct Groups, for Backlighting 2 Displays (main LCD and sub-LCD)·Excellent Current and Brightness Matching·High-Efficiency 3/2x Charge Pump·Extended Li-Ion Input: 2.7V to 5.5V·PWM Brightness Control: 100Hz - 1kHz·18-bump T...

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SeekIC No. : 004395069 Detail

LM2796: Features: ·Drives up to 7 LEDs with up to 20mA each·LEDs controlled in 2 Distinct Groups, for Backlighting 2 Displays (main LCD and sub-LCD)·Excellent Current and Brightness Matching·High-Efficiency...

LM2796 Data Sheet

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Part Number:
LM2796
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

·Drives up to 7 LEDs with up to 20mA each
·LEDs controlled in 2 Distinct Groups, for Backlighting 2 Displays (main LCD and sub-LCD)
·Excellent Current and Brightness Matching
·High-Efficiency 3/2x Charge Pump
·Extended Li-Ion Input: 2.7V to 5.5V
·PWM Brightness Control: 100Hz - 1kHz
·18-bump Thin Micro SMD Package: (2.1mm x 2.4mm x 0.6mm)




Application

·Mobile Phone Display Lighting
·Mobile Phone Keypad Lighting
·PDAs
·General LED Lighting




Specifications

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN pin voltage........................................ -0.3V to 7.1V
EN, ENA, ENB pin voltages .............-0.3V to (VIN+0.3V)
........................w/ 5.6V max
Continuous Power Dissipation
(Note 3)
Internally Limited
Junction Temperature (TJ-MAX) ..........................150oC
Storage Temperature Range ................-65 to +150
Maximum Lead Temperature
(Soldering, 10 sec.) ..............................................265
ESD Rating (Note 4)Human Body..........................2.0kV
Model:....................................................................200V
Machine Model

Regulated LEDs 7
Total LED Current 140 mA
Current Matching 1%
Boost Type Switched Capacitor 1.5x
Switching Frequency 500 kHz
Efficiency (peak) 80 %
Input Min Voltage 2.7 Volt
Input Max Voltage 5.5 Volt
Boost Voltage Unregulated
LED Configuration Parallel
Supply Current 3.5 mA
Switching Type Fixed Freq
Special Features LEDs controlled in 2 groups: 3 and 4 LEDs; softstart
PWM BrightCtrl Yes
Analog-V BrightCtrl No
Ambient Light Compensation No
RGB-LED No
Temperature Min -30 deg C
Temperature Max 85 deg C
RegType WhiteLED Driver
PowerWise Yes
View Using Catalog





Description

The LM2796 is a charge-pump based white-LED driver that is ideal for mobile phone display backlighting. It can drive up to 7 LEDs in parallel with up to 20mA through each LED. Regulated internal current sources deliver excellent current and brightness matching in all LEDs. The LED-driver current sources are split into two independently controlled groups. The primary group (4 LEDs) can be used to backlight the main phone display. The second group (3 LEDs) can be used to backlight a secondary display or to provide other lighting features (keypad LEDs, for example). Brightness of the two groups can be adjusted independently with pulsewidth modulated (PWM) digital signals.

The LM2796 works off an extended Li-Ion input voltage range (2.7V to 5.5V). Voltage boost is achieved with a highefficiency 3/2x-gain charge pump.

The LM2796 is available in National's chip-scale 18-bump micro SMD package.






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