LP5012 datasheet(32/40 Pages) TI1

32 / 40 page

RIREF=KIREF ×

VIREF

ISET

LP5009, LP5012

SLVSEH2 – MAY 2019

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Product Folder Links: LP5009 LP5012

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Typical Application (continued)

9.2.1 Design Requirements

Set the LED current to 15 mA using the RIREF resistor. Select the proper value for the other external components,

like VCAP pin capacitor and the SCL/SDA pullup resisters.

9.2.2 Detailed Design Procedure

LP50xx scales up the reference current (IREF) set by the external resistor (RIREF) to sink the output current (IOUT)

at each output port. The following formula can be used to calculate the external resistor (RIREF):

(2)

The SCL and SDA lines must each have a pullup resistor placed somewhere on the line (the pullup resistors are

normally located on the bus master). In typical applications, values of 1.8 kΩ to 4.7 kΩ are used.

VCAP is internal LDO output pin. This pin must be connected through a 1-µF capacitor to GND. Place the

capacitor as close to the device as possible.

TI recommends having a 1-µF capacitor between VCC and GND to ensure proper operation. Place the capacitor

as close to the device as possible.

LP5012 Datasheet(PDF) 32 Page - Texas Instruments