The SGM3133 is a high efficiency and cost effective charge pump white LED driver. It supports up to 4 white LEDs and regulates a constant current for uniform intensity. The part maintains the high efficiency by utilizing a 1×/1.5× fractional charge pump and low dropout current sources. The small equivalent 1× mode open loop resistance and ultra-low dropout voltage of current source extend the operating time of 1× mode and optimize the efficiency of Li-Ion battery in white LED applications.
User can easily configure each LED current from 1.25mA to 20mA by a pulse dimming control. The dimming of white LEDs current can be achieved by applying a pulse signal to the EN/SET pin. There are totally 16 steps of current could be set by users. The operating voltage range is 2.7V to 5.5V. Internal soft-start circuitry effectively reduces the in-rush current while both start-up and mode transition.
The SGM3133 is available in Green TQFN-3×3-16L package and is specified over an ambient temperature range of -40℃ to +85℃.
Input Voltage Range: 2.7V to 5.5V
Drives up to 4 LEDs at 20mA Each
16-Step Brightness Control
High Efficiency by Fractional Conversion with 1× and 1.5× Modes
Automatic Charge Pump Mode Selection
Switching Frequency: 1MHz
1% Typical LED Current Matching
Internal Soft-Start Limits Inrush Current
Low Input Noise and Low EMI
Over-Current and Over-Temperature Protection
Output Over-Voltage Protection
Under-Voltage Lockout with Hysteresis
Available in Green TQFN-3×3-16L Package
Mobile Phone, DSC, MP3
White LED Backlighting
LCD Display Supply
| Part Number | Status | Package | Pins | Pb-Free | Temp Range |
| SGM3133YTQ16G/TR | Production | TQFN-3×3-16L | 16 | Y | -40℃ to +85℃ |
