AL3157：LED Drivers for Displays / Backlights
| Part Number | Data Sheet | SPICE Model | Function | MinimumInput Voltage (V) | MaximumInput Voltage (V) | Maximum Output Voltage (V) | Number of Regulated Output Channels | Maximum Output Current per Channel (mA) | Typical Over-Current Protection Current (mA) | Switching Frequency (MHz) | Efficiency (%) | Quiescent Current (mA) | Standby Quiescent Current (µA) | SW RDS(ON) (Ω) | Dimming | OVP | Soft Start | VFB (V) | OperatingTemperatureRange (°C) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AL3157 | AL3157.pdf | - | Charge Pump LED Driver | 2.7 | 5.5 | 5.5 | 4 | 30mA/CH for BUL | - | 1.2 | 93 | 2 | 1 | 0.5 | PWM | Yes | Yes | - | -40 to +85 |
Description
The AL3157 is a low noise, constant frequency charge pump DC/DC converter that uses a Dual mode load switch (1x), and doubling (2x) conversion for driving white °Cs. Low external part count (one 1µF flying capacitor and two 2.2µF capacitors at VIN and VOUT) make this part ideally suited for small, battery-powered applications The AL3157 drives 3 channels at up to 30mA for small screen backlighting and an additional channel up to 210mA for °C Flash or °C Flashlight – All from a 2.7V to 5.5V input. The AL3157 uses two control inputs (EN1/2) to enable/disable it and PWM dim the °C current. EN2 controls/PWM dims the backlight °Cs at 30mA per channel and EN1 controls/PWM dims the Flash/Flashlight °Cs at 210mA. Each output of the AL3157 is equipped with built-in protection for VOUT short circuit and auto-disable for °C failure conditions. Built-in soft-start circuitry prevents excessive in-rush 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 AL3157 is available in a lead-free, space-saving, thermally enhanced 12-pin 3 x 3mm DFN package.
Application
- Mobile phone Backlighting + flashlight
- Mobile phone Backlighting + camera flash
- Small screen backlighting + auxilliary lighting
Ordering Information
- AL3157F-7
U-DFN3030-12
- AL3157.pdf AL3157
