The SGM3144 is a current-regulated white LED driver with integrated low dropout current sources and a high efficiency charge pump. The charge pump has automatically selectable 1×/1.5× fractional operation modes. The SGM3144 is well suited for white LED applications powered by a Li-Ion battery due to small equivalent open-loop resistance in 1× mode.
The supply voltage operates from 2.7V to 5.5V. The SGM3144 supports up to 6 LEDs for 27mA maximum current per string. The LED reference current is set through an internal resistor. PWM dimming interface allows programmable LED current levels from 0mA to 27mA for brightness control. If the EN pin is logic low, the SGM3144 enters shutdown mode. Built-in soft-start circuitry avoids excessive inrush current during startup and mode transition.
The SGM3144 is available in a Green TQFN-3×3-16L package and is rated over the -40℃ to +85℃ temperature range.
Input Voltage Range: 2.7V to 5.5V
Support to 6 LEDs at 27mA Each
PWM Dimming Interface
1× and 1.5× Charge Pump for High Conversion Efficiency
Switching Frequency: 0.93MHz
±4.8% Regulated LED Current Matching
Built-in Soft-Start for Reducing Inrush Current
Low Input Ripple and Low EMI
Protection Features
Over-Current Protection
Under-Voltage Lockout
Thermal Shutdown
Operating Temperature Range: -40℃ to +85℃
Available in a Green TQFN-3×3-16L Package
White LED Backlighting
Mobile Phones, MP3s
Digital Still Cameras
LCD Displays
