LM3550SPXSLASHNOPB datasheet(28/43 Pages) TI2

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CIN

COUT

VIN

VOUT

C1+

C1-

C2+ C2-

BAL

FET_CON

LED-

SCL

SDA

STROBE

IND

VIO

LM3550

GND

4.7 PF

2.2 PF

1 PF

ALD/TEMP

C1 = C2 = 1 PF, CIN = 4.7 PF, COUT = 2.2 PF

10 V X5R or X7R

Super-

Capacitor

2.7 V to 5.5 V

RSENSE

EOC

NTC

LM3550

SNVS569C – MAY 2009 – REVISED OCTOBER 2016

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Product Folder Links: LM3550

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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 LM3550 can drive multiple flash LEDs at currents up to 5 A total. The switched-capacitor boost on the

LM3550 eliminates the need of an inductor in the application.

8.2 Typical Application

Figure 49. LM3550 Typical Application

8.2.1 Design Requirements

For LM3550, use the parameters listed in Table 10.

Table 10. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Input voltage

2.7 V to 5.5 V

Output voltage

5.3 V (maximum)

Torch current

0 to 200 mA (maximum)

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