NRND = Not Recommended for New Design
HIGH-EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS
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The AL3159 is a low noise, constant frequency charge pump DC/DC converter that uses a Dual mode load switch (1X), and (2X) conversion for white LED applications. The AL3159 is capable of driving nine LED channels at 20mA from a 2.7V to 5.5V input. The current sinks may be operated using three simple logic control inputs individually or in parallel for driving higher-current LEDs. Low external part counts (one 1µF flying capacitor and two 2.2µF capacitors at VIN and VOUT) make this part ideally suited for small, battery-powered applications. AL3159 digital inputs are used to enable or disable the LED channels with a fixed default current settings at 20mA. Each output of the AL3159 is equipped with built-in protection for VOUT short circuit and auto-disable for LED short conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up and mode switching. A low-current shutdown feature disconnects the load from VIN to reduce quiescent current less than 1µA. The AL3159 is available in a lead-free, space-saving, thermally enhanced 20-pin 3 x 3mm QFN package.
| AEC Qualified | No |
|---|---|
| AEC-Q100 Grade | No |
| Compliance (Only Automotive supports PPAP) | Standard |
| Dimming | PWM |
| Dimming (Analog) | No |
| Dimming (PWM) | No |
| Efficiency (%) | 93 |
| Efficiency (%) | 93 |
| Function | Charge Pump LED Driver |
| LED Current (A) | 0.03 |
| MaximumInput Voltage (V) | 5.5 |
| Maximum Input Voltage (V) | 5.5 |
| Maximum LED Current (A) | 0.03 |
| Maximum Output Current per Channel | 30 |
| Maximum Output Voltage (V) | 5.5 |
| Maximum Output Voltage (V) | 5.5 |
| MinimumInput Voltage (V) | 2.7 |
| Minimum Input Voltage (V) | 2.7 |
| Number of Regulated Output Channels | 9 |
| OperatingTemperatureRange (°C) | -40 to 85 |
| Operating Temperature Range (°C) | -40 to 85 |
| OVP | Yes |
| AEC Qualified | No |
| Quiescent Current (µA) | 2 |
| Quiescent Current Typ (mA) | 2 |
| Quiescent Current Typ (mA) | 2 |
| Soft Start | Yes |
| Standby Quiescent Current (µA) | 1 |
| SW RDS(ON) | 0.5 |
| Switching Frequency (MHz) | 1.2 |
| Switching Frequency Maximum (kHz) | 1.2 |
| Topologies (Boost) | No |
| Topologies (Buck-Boost) | No |
| Topologies (Buck) | No |
| Topologies (Charge Pump) | Yes |
| Topology | Charge Pump |
| Typical Overcurrent Protection Current | N/A |
| VFB | N/A |
