LP5521 datasheet(38/48 Pages) TI1

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LP5521

MCU

COUT

1 PF

CIN

1 PF

SCL

SDA

CLK_32K

INT

ADDR_SEL0

ADDR_SEL1

TRIG

VDD

GNDs

VOUT

CFLY1P

CFLY1N

CFLY2P

CFLY2N

RGB LED 0...25.5 mA/LED

GPO

LP5521

SNVS441H – JANUARY 2007 – REVISED MAY 2016

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Product Folder Links: LP5521

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8.2.1.3 Application Curves

Figure 27. Charge Pump Load Transient Response in 1.5×

Mode (0 to 25.5 mA)

Figure 28. Charge Pump Line Transient Response

1.5× Mode (VIN 3.5V to 4 V)

8.2.2 Application Without Charge Pump

In this application example the input voltage is high enough to drive the LEDs even without charge pump. In that

case the charge pump components are omitted, allowing savings on bill-of-material and also board space.

Charge pump must be set to 1× mode (bypass) in this case.

Figure 29. Typical Application Schematic Without Charge Pump

8.2.2.1 Design Requirements

DESIGN PARAMETER

EXAMPLE VALUE

Input voltage range

4.5 V to 5.5 V

LED VF (max)

3.6 V

LED current

25.5 mA maximum

Input capacitor

CIN = 1 μF

Output capacitor

COUT = 1 μF

Fly capacitors

none

Charge pump mode

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