LM3463 datasheet(2/43 Pages) TI2

2 / 43 page

DR0

DR1

DR2

DR3

DR4

DR5

IOUTADJ

VREF

REFRTN

Faultb

SYNC

DIM01

DIM23

DIM4

DIM5

CLKOUT

LM3463

SNVS807A – MAY 2012 – REVISED MAY 2013

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DESCRIPTION CONTINUED

The LM3463 provides a sophisticated protection mechanism that secures high reliability and stability of the

lighting system. The protection features include VIN Under-Voltage–Lock-Out (UVLO), thermal shut-down, LED

short / open circuit protection and MOSFET drain voltage limiting. The LED short circuit protection protects both

the LED and MOSFETS by limiting the power dissipation on the MOSFETS.

Connection Diagram

Figure 1. TOP VIEW

48-Lead Plastic WQFN

Package Number RHS

PIN DESCRIPTIONS

Name

Description

Application information

0V reference for small signal return

This pin should connect to the end points of current sensing resistors with

REFRTN

paths

individual connections to ensure channel to channel current accuracy.

The current of all output channels (defined by RISNSn) reduces according

IOUTADJ

Output current level adjust pin

to the voltage at this pin. This pin should connect to the VREF pin when

output current reduction is not required.

This pin is the output of a precision reference voltage regulator. This pin

VREF

Precision reference voltage output

must be bypassed through a ceramic capacitor to REFRTN.

Device enable pin with internal pull-up

Enable input

Enable: VEN = Floating

Disable: VEN = GND

Frequency setting pin. Connect a resistor across this pin to GND to set the

internal oscillator frequency.

Internal oscillator control or external

clock input pin

The internal clock frequency can be defined by forcing an external clock

signal to this pin.

Fault indicator output. This pin is an open-drain output and is pulled low

Faultb

Fault indicator output

when an open circuit of LED string is identified.

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