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
120 mA total continuous output
Low input ripple and EMI
Soft-start limits inrush current
Short circuit protection
Overvoltage protection
Thermal shutdown protection
Space-saving MLP-16 package: 3 * 3 mm footprint
Very thin 0.75 mm nominal height packageApplication·White LED backlights for cellular phones, PDAs
·Digital cameras, camcorders
·Portable audio devices
·Other portable device white LED backlighting
·120 mA WLED flash/torchPinout
Specifications
- 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
- White LED backlights for cellular phones, PDAs
- Digital cameras, camcorders
- Portable audio devices
- Other portable device white LED backlighting
- 120 mA WLED flash/torch
Input or Output Voltage
VIN, VOUT, C1+, C1, C2+, and C2 pins..................................... 0.3 to 6 V
All other pins.......................................................................0.3 to VIN + 0.3 V
VOUT Short Circuit to GND ..............................................................Continuous
Operating Ambient Temperature, TA ..................................... 40°C to 85°C
Maximum Junction Temperature, TJ(max) ..............................................150°C
Storage Temperature, TS .................................................... 55°C to 150°CDescriptionThe 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.
A8435 Data Sheet
