Datasheet

+
-
CSP
CSN
Gm
-
+
Gm
10 PA
SS COMP
Level
Shift
Level
Shift
T
ON
EN
DIM
PWM
Driver
V
EE
Off-Time
Comp
Programmable
ON Time
UVLO
ADJ
Thermal
Shutdown
Bootstrap
Driver
Low Side
Gate
Driver
Linear
Regulator
V
IN
CGND
BST
V
CC
HO
HS
LO
LS
BST2
DIMO
DIMR
LM3433
www.ti.com SNVS535C –OCTOBER 2007–REVISED MAY 2013
PIN DESCRIPTIONS (continued)
Pin Name Function
19 DIMR LED dimming FET gate drive return. Tie to LED cathode.
20 DIMO LED dimming FET gate drive output. DIMO is a driver that switches between DIMR and BST2.
21 BST2 DIMO high side drive supply pin. Tie a 0.1µF between BST2 and CGND.
22 NC No internal connection. Tie to V
EE
or leave open.
23 CSN Current sense amplifier inverting input. Connect to current sense resistor negative terminal.
24 CSP Current sense amplifier non-inverting input. Connect to current sense resistor positive terminal.
EP V
EE
Exposed Pad on the underside of the device. Connect this pad to a PC board plane connected to V
EE
.
BLOCK DIAGRAM
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