A1

B1

C1

A2

EN1

SGND

B2

LED

-

A3

D1

VIN

PGND

D2

D3

C1

+

B3

C3

C2

EN2

C1

-

C2

+

C2

-

ISET

A1

B1

C1

A2

EN1

SGND

B2

LED

-

A3

D1

VIN

PGND

D2

D3

C1

+

B3

C3

C2

EN2

C1

-

C2

+

C2

-

CPOUT

ISET

3

LM2758

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SNVS551E – APRIL 2008 – REVISED MAY 2016

Product Folder Links: LM2758

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5 Pin Configuration and Functions

YZR Package

12-Pin DSBGA

Top View

YZR Package

12-Pin DSBGA

Bottom View

Pin Functions

PIN

TYPE

DESCRIPTION

NO.

NAME

A1

EN1

Input

The EN2 pins is used to select the modes (torch, indicator, flash), as well as to put the part into

shutdown mode.

A2

SGND

Ground

Analog and control ground for charge pump. Connect this pin directly to a low impedance

ground plane.

A3

ISET

Power

LED current programming resistor pin. A resistor connected between this pin, and GND is used

to set torch, flash and indicator currents.

B1

C1+

Power

Flying capacitor pin — connect a 1-µF ceramic capacitor from C1+ to C1

−

B2

CPOUT

Output

Charge pump regulated output. A 2.2-µF ceramic capacitor is required from CPOUT to GND.

Connect flash LED anode to this pin.

B3

EN2

Input

The EN1 pin is used to select the modes (torch, indicator, flash), as well as to put the part into

Shutdown mode.

C1

VIN

Input

Supply voltage connection

C2

C2+

Power

Flying capacitor pins — connect a 1-µF ceramic capacitor from C2+ to C2

−.

C3

LED

−

Output

Regulated current source output. Connect flash LED cathode to this pin.

D1

C2

−

Power

Flying capacitor pin — connect a 1-µF ceramic capacitor from C2+ to C2

−.

D2

C1

−

Power

Flying capacitor pin — connect a 1-µF ceramic capacitor from C1+ to C1

−

D3

PGND

Ground

Power ground for the charge pump and the current source. Connected the pin directly to a low-

impedance ground plane.