1

3

4

5

6

14

12

11

10

9

Die-Attach Pad: GND

VOUT

C1+

VIN

D3

D2

C2+

C1-

GND

C2-

EN

7

D1

8

ISET

2

D4

13

PWM

1

2

3

4

5

14

12

11

10

9

Die-Attach Pad: GND

VOUT

C2+

C1+

D4

D3

C1-

C2-

VIN

PWM

EN

8

ISET

13

GND

6

7

D2

D1

3

LM27951

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SNVS416C – NOVEMBER 2005 – REVISED FEBRUARY 2016

Product Folder Links: LM27951

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5 Pin Configuration and Functions

NHK Package

14-Pin WSON

Top View

NHK Package

14-Pin WSON

Bottom View

Pin Functions

PIN

TYPE

DESCRIPTION

NUMBER

NAME

1

C2+

Power

Flying capacitor C2 connection

2

VOUT

Power

Pre-regulated charge-pump output

3

C1+

Power

Flying capacitor C1 connection

4

D4

Output

Regulated current source output

5

D3

Output

Regulated current source output

6

D2

Output

Regulated current source output

7

D1

Output

Regulated current source output

8

ISET

Input

Current set input. Placing a resistor (RSET) between this pin and GND sets the LED

current for all the LEDs. LED current = 200 × (1.25 V / RSET).

9

EN

Input

Enable logic input pin. Logic low = shutdown; Logic high = enabled. There is a 150-k

Ω

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

10

PWM

Input

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 VOUT

node.

11

VIN

Input

Input supply: 2.8 V to 5.5 V

12

C2-

Power

Flying capacitor C2 connection

13

GND

Ground

Power supply ground connection

14

C1-

Power

Flying capacitor C1 connection