GENERAL DEscriptION

The SGM37603A is a high efficiency 3-string white LED driver with a 1.2MHz boost converter. The supply voltage operates from 3V to 24V. The SGM37603A is capable of driving up to 8 LEDs in series for 40mA maximum LED current per string while achieving high conversion efficiency. An adaptively current-regulated method allows different LED string voltages while LED current remains in regulation. The LED current is programmed through an I²C interface or a PWM signal input. These features make it optimized for compact solutions and ideal for LCD display backlighting.

The SGM37603A is available in Green WLCSP-1.78×1.36-12B and TDFN-3×3-12L packages. It operates over the -40℃ to +85℃ temperature range.

FEATURES

• 12-Bit Resolution for Dimming Control

• Up to 90% Boost Efficiency

• Switching Frequency: 1.2MHz

• Support 1 to 3 LED Strings in Parallel at Maximum 29.5V Output

• 11% LED Current Matching across Process, Voltage and Temperature at ILED = 12.21μA

• 1% LED Current Matching across Process, Voltage and Temperature at ILED = 25mA

• 11% LED Current Accuracy across Process, Voltage and Temperature at ILED = 12.21μA

• 3% LED Current Accuracy across Process, Voltage and Temperature at ILED = 25mA

• PWM Dimming Interface

• Programmable I²C Interface

• Phase Shift Function

• Hybrid PWM + Current Dimming for Higher LED Driver Optical Efficiency

• Low EMI by Conducting Ringing Cancelling

• Protection Features

  Over-Voltage Protection

  Over-Current Protection

  Thermal Shutdown

APPLICATIONS

Power Source for Smart Phone and Tablet Backlighting