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LDS8866
6-Channel Ultra Low Dropout LED Driver
FEATURES
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Charge pump modes: 1-x, 1.33-x, 1.5-x, 2-x
Ultra low dropout PowerLite ? Current
Regulator*
Drives up to 6 LEDs up to 32 mA each
Factory preset current value for each LED
bank
PWM brightness control with up to 25,000:1
dimming range at 200 Hz
Power efficiency up to 94%
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Low input noise & ripple in all charge pump
modes
Low current shutdown mode
Short circuit current limiting
Thermal shutdown protection
Available in 3 x 3 x 0.8 mm 16-pin TQFN
package
PowerLite ? Current Regulator (PCR) increases
device’ efficiency up to 94%. New mode requires no
additional external capacitors.
The PWM1/PWM2 logic inputs function as a chip
enable and a PWM mode LED brightness control.
PWM1 pin contorls LEDA and LEDB banks with four
LEDs, while PWM2 controls bank LEDC with two
LEDs.
APPLICATION
The maximum LEDs current is factory preset. Every
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Keypad and Display Backlight
Cellular Phones
Digital Still Cameras
PDAs and Smartphones
LED bank with two LEDs each is programmable
separately in the range from 0.5 to 32 mA in 0.5 mA
steps.
Low noise input ripple is achieved by operating at a
constant switching frequency which allows the use of
DESCRIPTION
The LDS8866 is a high efficiency multi-mode
fractional charge pump with ultra low dropout voltage
that can drive up to six LEDs. Inclusion of a 1.33-x
fractional charge pump mode and ultra low dropout
TYPICAL APPLICATION CIRCUIT
small external ceramic capacitors. The multi-
fractional charge pump supports a wide range of
input voltages from 2.7 V to 5.5 V.
The device is available in a 16-lead TQFN 3 mm x
3 mm package with a max height of 0.8 mm.
? 2009 IXYS Corp.
Characteristics subject to change without notice
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Doc. No. 8866DS, Rev. N2.0
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