LP5524 datasheet(6/14 Pages) TI1

6 / 14 page

LP5524

SNVS500 – JULY 2007

www.ti.com

LED Driver Typical Performance Characteristics

TJ = 25°C. Unless otherwise noted, typical performance characteristics apply to the LP5524 Block Diagram with: VIN = 3.6V,

RISET = 32.4 kΩ, CIN = 100 nF.

Output Current vs RISET (Expanded Range)

Output Current vs RISET

Output Current vs Input Voltage

(ISET Connected To VDD)

Output Current vs Headroom Voltage

PWM Responce (Both Channels)

PWM Response (Single Channel)

Application Information

ENABLE MODE

The LP5524 has four constant current LED outputs which are split into two independently controlled banks. Each

bank has its own enable input. ENA is used to control bank A and ENB is used to control bank B. Both enables

are active high and have internal pull–down resistors. When both enables are low part is in low power standby

mode. Driving either enable high will activate the part and corresponding LED outputs.

ISET PIN

An external resistor (RISET) connected to ISET pin sets the output current of all the LEDs. The internal current

mirror sets the LEDs output current with a 416:1 ratio to the current through RISET. The following equation

approximates the LED current:

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