LP5526TLSLASHNOPB datasheet(21/41 Pages) TI1

21 / 41 page

+85°C

-40°C

+25°C

RRGB = 2.4 kÖ

VDD = 3.6V

LP5526

www.ti.com

SNVS431D – FEBRUARY 2006 – REVISED MARCH 2013

RGB LEDs Driver Performance Characteristics

Parameter

Test Conditions

Min

Typ

Max

Unit

ILEAKAGE

RLED, GLED, BLED pin leakage

µA

current

IMAX(RGB)

Maximum recommended sink

CC mode

current(1)

SW mode

Accuracy at 50mA

CC mode

12.5

Current mirror ratio

CC mode

1:100

RGB current matching error

IRGB set to 50mA, CC mode

RSW

Switch resistance

SW mode

3.2

Ω

ƒRGB

RGB internal PWM switching

Accuracy same as internal clock

kHz

frequency

frequency accuracy

VSAT

Saturation voltage (current drop

+25ºC, IRGB set to 50mA

230

350

10%)

-30ºC

300

+85ºC

430

(1)

RGB current should be limited as follows:

constant current mode – limited by external RRGB resistor

switch mode – limited by external ballast resistors

Output Current

Pin Voltage (CC Mode)

RRGB (CC Mode)

Figure 21.

Figure 22.

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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