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MFG:ADI D/C:09
Part Number: ADM8845
MFG: ADI
D/C: 09
Description: The ADM8845 provides the power required to drive up to six LEDs, using charge pump technology. The LED...
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ADM8845
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DataSheet
General Description
ADM8845 General Description
The ADM8845 provides the power required to drive up to six LEDs, using charge pump technology. The LEDs are used for backlighting a color LCD display, with up to four LEDs in the main display and up to two LEDs in the sub display, with regulated constant current for uniform brightness intensity. Two digital input control pins, CTRL1 and CTRL2 control the shutdown operation and the brightness of the main and sub displays.
To maximize power efficiency, a charge pump that can operate in either of a 1x, 1.5x or 2x mode is used. The charge pump automatically switches between 1x/1.5x/2x modes based on the input voltage, to maintain sufficient drive for the LED anodes at the highest power efficiency.
Improved brightness matching of the LEDs is achieved by the use of a feedback pin to sense individual LED current with a maximum matching accuracy of 1%.
ADM8845 Maximum Ratings
| Parameter | Rating |
| Supply Voltage VCC ISET CTRL1, CTRL2 VOUT shorted (Note 3) Feedback pins FB1 to FB6 Operating Temperature Range VOUT (Note 4) Storage Temperature Range Power Dissipation ESD Class |
0.3 V to +6.0 V 0.3 V to +2.0 V 0.3 V to +6.0 V Indefinite 0.3 V to +6.0 V 40 to +85 180mA 65 to +125 2mW 1 |
ADM8845 Features
ADM8845 drives 6 LEDs from a 2.6 V to 5.5 V (li-ion) input
supply
1x/1.5x/2x Fractional Charge Pump to maximise power
efficiency
1% Max LED Current Matching
Up to 88% Power Efficiency over Li-ion Range
Powers Main and Sub Display LEDs with individual
shutdown
Package footprint only 9mm2 (3mm x 3mm)
Package height only 0.9mm
Low power shutdown mode
Shutdown Function
Soft-start limiting inrush current
supply
1x/1.5x/2x Fractional Charge Pump to maximise power
efficiency
1% Max LED Current Matching
Up to 88% Power Efficiency over Li-ion Range
Powers Main and Sub Display LEDs with individual
shutdown
Package footprint only 9mm2 (3mm x 3mm)
Package height only 0.9mm
Low power shutdown mode
Shutdown Function
Soft-start limiting inrush current
ADM8845 Typical Application
Mobile phones with Main and Sub Displays
White LED Backlighting
Camera Flash/Strobes and Movie Light Applications
Micro TFT color displays
DSC
PDA's
White LED Backlighting
Camera Flash/Strobes and Movie Light Applications
Micro TFT color displays
DSC
PDA's
ADM8845 Connection Diagram
ADM8845ACP
PDF/DataSheet Download
- Datasheet: ADM8845ACP
- File Size: 349737 KB
- Manufacturer: AD [Analog Devices]
- Click here to Download
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