Connection Diagram

LM27951

14-pin No-Pullback Leadless Leadframe Package (LLP-14)

4mm x 3mm x 0.8mm

NS Package Number SDA14A

20171702

Pin Descriptions

Pin

Name

Description

1

C2+

Flying Capacitor C2 Connection

2V

OUT

Pre-Regulated Charge Pump Output

3

C1+

Flying Capacitor C1 Connection

4

D4

Regulated Current Source Output.

5

D3

Regulated Current Source Output.

6

D2

Regulated Current Source Output.

7

D1

Regulated Current Source Output.

8I

SET

Current Set Input. Placing a resistor (R

the LED current for all the LEDs. LED Current = 200 x (1.25V ÷ R

9

EN

Enable Logic Input Pin. Logic Low = Shut Down, Logic High = Enabled. There

is a 150k

Ω (typ.) resistor connected internally between the EN pin and GND.

10

PWM

Current Source Modulation Logic Input Pin. Logic Low = Off, Logic High = On.

Applying a Pulse Width Modulated (PWM) signal to this pin allows the

regulated current sources to be modulated without shutting down the internal

Charge Pump and the V

11

V

IN

Input Supply Range: 3.0V to 5.5V.

12

C2-

Flying Capacitor C2 Connection.

13

GND

Power Supply Ground Connection.

14

C1-

Flying Capacitor C1 Connection.

Ordering Information

Order Number

Package Description

Package Marking

Supplied as Tape and Reel

(Units)

LM27951SD

No-Pullback

LLP-14

XXXXX = ¢Z¢2¢X

YYYYY = D006B

1000

LM27951SDX

4500

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