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Part Number: A8435
Description: The A8435 high efficiency charge pump IC offers a simple, low-cost white LED driver solution for porta...
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A8435
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General Description
A8435 General Description
The A8435 high efficiency charge pump IC offers 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 continuous output current of 120 mA, meeting the requirements of most Li-ion batterypowered 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 A8435 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.
A8435 Maximum Ratings
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°C
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°C
A8435 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 package
`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 package
A8435 Typical Application
·White LED backlights for cellular phones, PDAs
·Digital cameras, camcorders
·Portable audio devices
·Other portable device white LED backlighting
·120 mA WLED flash/torch
·Digital cameras, camcorders
·Portable audio devices
·Other portable device white LED backlighting
·120 mA WLED flash/torch
A8435 Connection Diagram
A8435
PDF/DataSheet Download
- Datasheet: A8435
- File Size: 717388 KB
- Manufacturer: allegromicro
- Click here to Download
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