The LM27966 is a highly integrated charge-pump-based display LED driver. The device can drive up to 6 LEDs in parallel with a total output current of 180mA. 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, which can be configured with 4 or 5 LEDs, can be used to backlight the main phone display. An additional, independently controlled led driver is provided for driving an indicator or other general purpose LED function. The LM27966 has an I2C compatible interface that allows the user to independently control the brightness on each bank of LEDs.
The device provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2, or in Pass-Mode. The proper gain for maintaining current regulation is chosen, based on LED forward voltage, so that efficiency is maximized over the input voltage range.
The LM27966 is available in a small 24-pin Leadless Leadframe WQFN-24 package.
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| Number of channels | 6 |
| Vin (min) (V) | 2.7 |
| Vin (max) (V) | 5.5 |
| Vout (min) (V) | 2.7 |
| Vout (max) (V) | 5.5 |
| Type | Capacitive |
| Switching frequency (max) (kHz) | 1570 |
| Duty cycle (max) (%) | 100 |
| LED current per channel (mA) | 30 |
| Peak efficiency (%) | 91 |
| Topology | Boost |
| Features | I2C control |
| Operating temperature range (°C) | -30 to 85 |
| Rating | Catalog |
| WQFN (RTW) | 24 | 16 mm² 4 x 4 |
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