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LP5521 Datasheet(PDF) 36 Page - Texas Instruments

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Part # LP5521
Description  LP5521 Programmable Three-Channel LED Driver
PDF  48 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP5521 Datasheet(HTML) 36 Page - Texas Instruments

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LP5521
MCU
COUT
1 µF
CIN
1 µF
0.47 µF
CFLY1
CFLY2
SCL
SDA
CLK_32K
INT
ADDR_SEL0
ADDR_SEL1
TRIG
EN
VDD
GNDs
R
G
B
VOUT
CFLY1P
CFLY1N
CFLY2P
CFLY2N
RGB LED 0...25.5 mA/LED
GPO
0.47 µF
Copyright © 2016, Texas Instruments Incorporated
36
LP5521
SNVS441H – JANUARY 2007 – REVISED MAY 2016
www.ti.com
Product Folder Links: LP5521
Submit Documentation Feedback
Copyright © 2007–2016, Texas Instruments Incorporated
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LP5521 is designed as a autonomous lighting controller for mobile devices. These devices need extremely
small form factor; therefore, the LP5521 is designed to require only 4 small capacitors: input, output, and two fly-
capacitors for charge pump. If charge pump is not needed in the application (input voltage is high enough for
driving LEDs), the charge pump capacitors can be omitted thus reducing the solution size even further. LED can
be RGB LED or any color if desired.
8.2 Typical Applications
Application with Charge Pump shows an example of typical application which uses charge pump to get high
enough voltage to drive LEDs. The device is powered from single Li-Ion battery with voltage range of 2.7 V to 4.2
V.
8.2.1 Application with Charge Pump
Figure 26. LP5521 Typical Application Schematic With Charge Pump
8.2.1.1 Design Requirements
DESIGN PARAMETER
EXAMPLE VALUE
Input voltage range
2.7 V to 4.2 V (single Li-Ion cell battery)
LED VF (maximum)
3.6 V
LED current
25.5 mA maximum
Input capacitor
CIN = 1 μF
Output capacitor
COUT = 1 μF
Fly capacitors
CFLY1 = CFLY2 = 470 nF
Charge pump mode
Automatic or 1.5×



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