Datasheet
DR0
DR1
DR2
DR3
DR4
DR5
VIN
IOUTADJ
VREF
EN
GND
REFRTN
FS
Faultb
SYNC
MODE
DIM01
DIM23
DIM4
DIM5
CDHC
DRVLIM
CLKOUT
FCAP
OutP
VLedFB
ISR
VCC
GD0
SE0
GD1
SE1
GD2
SE2
GD3
SE3
GD4
SE4
GD5
SE5
NC
NC
NC
NC
NC
NC
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
25
26
27
28
29
30
31
32
33
34
35
36
48
47
46
45
44
43
42
41
40
39
38
37
EP
LM3463
SNVS807A –MAY 2012–REVISED MAY 2013
www.ti.com
DESCRIPTION CONTINUED
The LM3463 provides a sophisticated protection mechanism that secures high reliability and stability of the
lighting system. The protection features include V
IN
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
Pin Name Description Application information
0V reference for small signal return This pin should connect to the end points of current sensing resistors with
1 REFRTN
paths individual connections to ensure channel to channel current accuracy.
The current of all output channels (defined by R
ISNSn
) reduces according
2 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
3 VREF Precision reference voltage output
must be bypassed through a ceramic capacitor to REFRTN.
Device enable pin with internal pull-up
4 EN Enable input Enable: V
EN
= Floating
Disable: V
EN
= GND
Frequency setting pin. Connect a resistor across this pin to GND to set the
internal oscillator frequency.
Internal oscillator control or external
5 FS
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
6 Faultb Fault indicator output
when an open circuit of LED string is identified.
2 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated
Product Folder Links: LM3463