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A8435: High Efficiency Charge Pump White LED Driver (PDF)
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A8435: Allegro Announces New High Efficiency Charge Pump White LED Driver
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A8435
High Efficiency Charge Pump White LED Driver
Features
- Proprietary adaptive control scheme (1, 1.5)
- Maximum efficiency, over 92%
- 0.5% LED current matching
- 1 MHz operating frequency
- Flexible dimming control:
- Serial 11-level dimming, down to 5%
- PWM
- 2-bit parallel
- Drives up to 4 white LEDs
- 30 mA per LED
- Low input ripple and EMI
- Soft-start limits inrush current
- Short circuit protection
- Overvoltage protection
- Thermal shutdown protection
- Space-saving 3 3 mm MLP-16 package
- Very thin 0.75 mm nominal height package
Applications
- White LED backlights for cellular phones, PDAs
- Digital cameras, camcorders
- Portable audio devices
- Other portable device white LED backlighting
- 120 mA WLED flash/torch
Description
The A8435 high efficiency charge pump IC offer a simple, low-cost white LED driver solution for portable electronics display applications. Using a proprietary control scheme (1, 1.5), the A8435 can output well-matched currents for up to 4 LEDs, while maintaining the highest efficiency over most of the Li-ion battery lifetime.
The A8435 accepts an input range of 2.7 to 5.5 V and delivers up to 30 mA for each of the four regulated current sources. The A8435 can deliver a total output current of 120 mA, meeting the requirements of most Li-ion battery-powered white LED backlight applications. Outputs can also be tied together for WLED flash/torch applications.
The A8435 offers flexible options for LED current driving. The LED current can be set by any of the following methods: (a) choosing an appropriate value for RSET, (b) 2-bit parallel control with 3 levels, (c) PWM control, or (d) serial programming.
The 8435 is available in a very thin profile 0.75 mm (nominal height) 3 3 mm MLP-16 package (ES), fitting the needs of space-conscious applications.
Evaluation tool and reference design are available for this device. For more information, contact us.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A8435EES-T | 16-lead QFN | -- | -- | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A8435EESTR-T | 16-lead QFN | Yes | view data | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.