LM3444MM Datasheet, PDF (2/30 Pages) Texas Instruments – AC-DC Offline LED Driver

LM3444
SNVS682C – NOVEMBER 2010 – REVISED MAY 2013
Connection Diagrams
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NC 1
NC 2
NC 3
COFF 4
FILTER 5
10 NC
9 V_CC
8 GATE
7 I_SNS
6 GND
NC 1
FILTER 2
GND 3
I_SNS 4
8 COFF
7 NC
6 VCC
5 GATE
Figure 1. 10-Pin VSSOP (Top View)
See DGS Package
Figure 2. 8-Lead SOIC (Top View)
See D Package
VSSOP
1
2
3
4
SOIC
1
8
5
2
6
3
7
4
8
5
9
6
10
7
Name
NC
NC
NC
COFF
FILTER
GND
ISNS
GATE
V_CC
NC
PIN DESCRIPTIONS
Description
No internal connection. Leave this pin open.
No internal connection. Leave this pin open.
No internal connection. Leave this pin open.
OFF time setting pin. A user set current and capacitor connected from the output to this pin sets the
constant OFF time of the switching controller.
Filter input. A low pass filter tied to this pin can filter a PWM dimming signal to supply a DC voltage to
control the LED current. Can also be used as an analog dimming input. If not used for dimming connect a
0.1µF capacitor from this pin to ground.
Circuit ground connection.
LED current sense pin. Connect a resistor from main switching MOSFET source, ISNS to GND to set the
maximum LED current.
Power MOSFET driver pin. This output provides the gate drive for the power switching MOSFET of the
buck controller.
Input voltage pin. This pin provides the power for the internal control circuitry and gate driver.
No internal connection. Leave this pin open.
2
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