Feb 9-07 Rev E

Constant Current LED Driver

© 2007 Sipex Corporation

SP7619/19A

GENERAL DESCRIPTION

The SP769 is a linear low-side, constant-current driver designed to drive high power LEDs

from an input voltage rail. The driver acts as a current source, ensuring constant LED cur-

rent across a range of input voltages. The SP769 allows implementing the lowest cost LED

driver for a variety of applications. Internal circuitry maintains the preset constant current

output for a wide voltage range at the LED input. The LED current can be set at 200mA

at torch mode or 500mA (700mA SP7619A) at flash mode by selecting CTRL pin low/high

respectively. Dimming or shutdown can be done by feeding a PWM signal to the EN pin.

Fast EN turn-on/off time allows for very fast dimming frequencies, completely eliminating

flicker. The built-in thermal protection automatically stops LED current to prevent overheat-

ing. A timeout function serves as a fail safe, shutting down the output at 500mA (700mA)

current after 4 seconds of continuous operation if the enable input is not cycled. The Enable

pin should be cycled HIGH/LOW/HIGH to restart the driver.

FEATURES

Very low dropout voltage (60mV@200mA)

Accurate current regulation down to dropout

voltage

No external components

Selectable output current levels: 200mA &

500mA (700mA for SP769A)

Power-saving shutdown mode of µA

Fast turn-on (<50µs)

Timeout function to protect the LED

Thermal Shutdown protection

RoHS compliant, Lead Free packaging:

Space saving 2mmx3mm 8pin DFN

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Constant Current LED Driver

APPLICATIONS

Next Generation Mobile Phones

PDA, DSC, MP3 Players

Handheld Computers

LCD Display Modules

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SP7619

8 Pin DFN

8

7

6

5

1

2

3

4

GNDP

GNDP

GND

CTRL

LED

EN

LED

VCC

TYPICAL APPLICATION CIRCUIT

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