LM3433SQ/NOPB National Semiconductor, LM3433SQ/NOPB Datasheet - Page 2

• Manufacturer Part Number: LM3433SQ/NOPB
• Description: IC LED DRIVER HIGH BRIGHT 24-LLP
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: HBLED Driverr

Specifications of LM3433SQ/NOPB

• Constant Current: Yes
• Topology: PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Internal Driver: No
• Type - Primary: Automotive, Backlight
• Type - Secondary: High Brightness LED (HBLED)
• Frequency: 1MHz
• Voltage - Supply: 3 V ~ 5.8 V
• Mounting Type: Surface Mount
• Package / Case: 24-LLP
• Operating Temperature: -40°C ~ 125°C
• Internal Switch(s): No
• Efficiency: 92%
• For Use With: LM3433SQ-36AEV - BOARD EVALUATION FOR LM3433SQ
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Current - Output / Channel: -
• Other names: LM3433SQTR

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Connection Diagram
Ordering Information
Pin Descriptions
Order Number
LM3433SQX
Pin
LM3433SQ
10
11
12
13
14
1
2
3
4
5
6
7
8
9
CGND
COMP
Name
ADJ
DIM
T
V
NC
NC
NC
EN
V
SS
LO
LS
ON
EE
IN
NOPB
NOPB
Spec.
Package
On-time programming pin. Tie an external resistor (R
(C
illuminated.
Analog LED current adjust. Tie to V
to an external reference to adjust the average current sense resistor voltage (programmed output
current). Refer to the "V
Characteristics section and the Design Procedure section of the datasheet.
Enable pin. Connect this pin to logic level HI or V
CGND for low current shutdown. EN is internally tied to V
Logic level input for LED PWM dimming. DIM is internally tied to CGND through a 100k resistor.
Logic power input: Connect to positive voltage between +3.0V and +5.8V w.r.t. CGND.
Chassis ground connection.
Negative voltage power input: Connect to voltage between –14V to –9V w.r.t. CGND.
Compensation pin. Connect a capacitor between this pin and V
No internal connection. Tie to V
Soft Start pin. Tie a capacitor from SS to V
if function is not used. The SS pin is pulled to V
No internal connection. Tie to V
No internal connection. Tie to V
Low side FET gate drive return pin.
Low side FET gate drive output. Low in shutdown.
LLP-24
LLP-24
Type
ON
) from T
NS Package Number SQA24A
ON
NSC Package
to V
Drawing
SQA24A
SQA24A
EE
24-Lead LLP
. This sets the nominal operating frequency when the LED is fully
Top View
SENSE
2
vs. ADJ Voltage" graphs in the Typical Performance
EE
EE
EE
or leave open.
or leave open.
or leave open.
IN
1000 Units, Tape and Reel
4500 Units, Tape and Reel
for fixed 60mV average current sense resistor voltage. Tie
EE
Function
to reduce input current ramp rate. Leave pin open
EE
IN
when the device is not enabled.
30031504
for normal operation. Connect this pin to
ON
) from T
IN
Supplied As
through a 100k resistor.
EE
ON
.
to CSN, and a capacitor