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ADM8845

Features: ADM8845 drives 6 LEDs from a 2.6 V to 5.5 V (li-ion) inputsupply1x/1.5x/2x Fractional Charge Pump to maximise powerefficiency1% Max LED Current MatchingUp to 88% Power Efficiency over Li-ion RangePowers Main and Sub Display LEDs with individualshutdownPackage footprint only 9mm2 (3mm x 3...

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SeekIC No. : 004276109 Detail

ADM8845: Features: ADM8845 drives 6 LEDs from a 2.6 V to 5.5 V (li-ion) inputsupply1x/1.5x/2x Fractional Charge Pump to maximise powerefficiency1% Max LED Current MatchingUp to 88% Power Efficiency over Li-i...

ADM8845 Data Sheet

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Part Number:
ADM8845
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



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




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




Pinout

ADM8845 Diagram

Connection Diagram




Specifications

Product Description Charge Pump Driver for 6 White LED LCD Backlights
Input Voltage Range (Vcc) 2.6 to 5.5V
Base Drive (mA) n/a
Efficency (%) 88%
LED # 6
Frequency Range 0.1 to 200 kHZ
Package 16-LFCSP


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





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 o, 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 in ADM8845. 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% inADM8845.






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