Texas Instruments LM2796 Dual-Display White LED Driver
Texas Instruments LM2796 Dual-Display White LED Driver is a charge-pump-based white-LED driver ideal for mobile phone display backlighting. This device can drive up to 7 LEDs in parallel with up to 20mA through each LED. The regulated internal current sources deliver excellent current and brightness matching in all LEDs. The Texas Instruments LM2796 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). The brightness of each group can be adjusted independently with pulse-width modulated (PWM) digital signals.
Features
- Drives up to seven LEDs with up to 20mA each
- LEDs are controlled in two distinct groups for backlighting two 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)
- 100Hz - 1kHz PWM brightness control
- 18-bump thin DSBGA package (2.1mm x 2.4mm x 0.6mm)
Applications
- Mobile phone display
- Mobile phone keypad lighting
- PDAs
- General LED lighting
Typical Application Circuit
Published: 2017-02-28
| Updated: 2022-04-01