lp5526tlx National Semiconductor Corporation, lp5526tlx Datasheet - Page 19

• Manufacturer Part Number: lp5526tlx
• Description: Lighting Management Unit With High Voltage Boost Converter With Up To 150ma Serial Flash Led Driver
• Manufacturer: National Semiconductor Corporation

Backlight Drivers
LP5526 has 2 independent backlight drivers. Both drivers are regulated constant current sinks. LED current for both LED strings
are controlled by the 8-bit current mode DACs with 0.1 mA step. MAIN and SUB LEDs can be also controlled with one DAC
(MAIN) for better matching allowing the use of larger displays having up to 8 white LEDs by setting DISPL bit to 1.
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SUB output for 2 LEDs (DISPL = 0)
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MAIN output for 4 LEDs (DISPL = 0)
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MAIN and SUB outputs for 8 LEDs (DISPL = 1)
EXTERNAL PWM CONTROL
The GPIO[0]/PWM pin can be used to control the backlight drivers brightness or set leds on/off. External PWM control is enabled
by writing 1 to EN_MAIN_PWM and/or EN_SUB_PWM bits in register address 2BH. GPIO[0]/PWM pin is used as external PWM
input when EN_PWM_PIN is set high. PWM input is active high, i.e. LED is activated when in high state.
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