Connection Diagram

LM2754

24-pin No-Pullback Leadless Leadframe Package (LLP-24)

4mm x 4mm x 0.8mm

NS Package Number SQA24A

20202802

Pin Descriptions

Pin

Name

Description

23,24

V

INSW

Input Voltage Connection for Switch Array. Pins 23 and 24 are connected

internally on the die. Connect V

22

V

IN

Input Voltage Connection. Connect V

8V

OUT

Output Voltage. Connect to LED Anodes.

12, 13, 14, 15

D1, D2, D3, D4*

Regulated Current Sink Inputs. (* See SEL PIN description)

1, 2, 7, 5

C

Flying Capacitor Connections.

3

GND

SW

Switch Array Ground Connection. Connect GND and GND

9, 16, 17

GND

Ground Connection. Connect GND and GND

21

EN

Enable Control Pin. Logic High = Normal Operation in Torch Mode.

Logic Low = Device Shut-Down. (See Note)

20

T/F

Torch/Flash Control Pin. Logic High = Flash Mode. Logic Low = Torch Mode.

Device must be enabled for Torch or Flash to operate. (See Note)

10, 11

I

Current Set Resistor Connections. Connect 1% resistors to ground to set the

desired current through the LEDs. LED current is approximated by the

equation: 800 x (1.25V ÷ R). This equation corresponds to the current through

one current sink. Total LED current is equal to the sum of currents through all

current sinks connected to the LED. The equation used for Torch (I

Flash (I

19

TX

RF PA synchronization control pin. Logic High = Force Torch Mode. Logic Low

= Normal Operation. (See Applications Information section for the full

operational description) (See Note)

18

SEL

D

D

4, 6

No Connect

Do not connect to any node.

Note: EN, T/F, TX, and SEL pins each have a 500k

Ω resistor connected internally to GND

Ordering Information

Order Number

Package Description

Package Marking

Supplied as Tape and Reel

(Units)

LM2754SQ

No-Pullback

LLP-24

UZXYTT

LM2754

1000

LM2754SQX

4500

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