The LM27965 is a highly integrated charge-pump-based dual-display LED driver. The device can drive up to 9 LEDs in parallel with a total output current of 180mA. Regulated internal current sinks deliver excellent current and brightness matching in all LEDs.
The LED driver current sinks are split into three independently controlled groups. The primary group can beconfigurabled with 4 or 5 LEDs, for backlighting a larger main display and the second group can be configured with 2 or 3 LEDs, for backlighing a smaller secondary display. An additional, independently controlled led driver is provided for driving an indicator or general purpose LED. The LM27965 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 LM27965 is available in a small 24-pin WQFN-24 package.
| Number of channels | 8 |
| 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 | Buck |
| Features | I2C control |
| Operating temperature range (°C) | -30 to 85 |
| Rating | Catalog |
| WQFN (RTW) | 24 | 16 mm² 4 x 4 |
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