Jun29-07 RevD

SP7120/22 Low Dropout LED Driver

© 2007 Sipex Corporation

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FEATURES

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LED Driver for common cathode parallel

connected LEDs

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Ultra Low Dropout Voltage of 150mV

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No EMI, no switching noise

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Integrated current matching

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PWM and Analog brightness control

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Enable/Shutdown control

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Shutdown current < 1µA

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Lead Free, RoHS Compliant Package:

Small footprint SOT23-6

APPLICATIONS

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Mobile Phones

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PDA, DSC, MP3 players

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Handheld Computers

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Keypads and display backlight

GENERAL DESCRIPTION

The SP712X driver’s family provides a simple solution for a matched current source for any

color common cathode LED configuration. The common cathode connection allows the user to

increase the LED power dissipation by having the cathodes heat-sinked to the ground plane of

the circuit board. The SP7120 may drive two LEDs or one LED at twice the current with two

channels connected in parallel. The SP7122 can drive three LEDs or one LED at three times

the current. The factory preset current values are 15mA (version A), 20mA (version B), or 25mA

(version C) per channel. In shutdown mode (EN pin is LOW), the supply current drops to 40nA

APPLICATION SCHEMATIC

SP7120 Powering 2 LEDs

2 or 3 Channel Low Dropout

High Side Linear LED Driver

SP7120/22

C1 1nF