LP3367-02

Feb.-2011

www.lowpowersemi.com

Page 2 of 10

Preliminary Datasheet

LP3367

Functional Pin Description

Package Type

Pin Configurations

TDFN-10

VIN

C1

C2

FLASH

EN

VOUT

PGND

SGND

FB

RSET

1

2

3

4

5

6

7

8

9

10

Pin Description

Pin

Name

Description

1

VIN

Input voltage for the charge pump, Decouple with 1uF ceramic capacitor close to the pins of

the IC.

2

C1

Positive input for the external flying capacitor. Connect a ceramic 1uF capacitor close to the

pins of the IC.

3

C2

Negative input for the external flying capacitor. Connect a ceramic 1uF capacitor close to

the pins of the IC.

4

FLASH

Logic input to toggle operation between FLASH and TORCH mode. In TORCH mode FB is

regulated to the internal 50mV reference. In FLASH mode FB reference voltage can be

adjusted by changing the resistor from RSET pin to ground. Choose the external current

sense resistor (RSENSE ) based on desired current in TORCH mode and FLASH mode.

5

EN

Shutdown control Input. Connect to VIN for normal operation, connect to ground for

shutdown.

6

RSET

Connect a resistor from this pin to ground, When in FLASH mode ( FLASH = High ) this

resistor sets the current regulation point according to the following: VFB = ( 1.26V

/RSET )×11.2kΩ

7

FB

Feedback input for the current control loop. Connect directly to the current sense resistor.

8

SGND

Internal ground pin. Control circuitry returns current to this pin.

9

PGND

Power ground pin. Flying capacitor current returns through this pin.

10

VOUT

Charge pump output voltage. Decouple with an external capacitor. At least 1uF is

recommended. If Higher value capacitor is used output ripple is smaller.