GENERAL DEscriptION
The SGM3743 is a 2-channel white LED driver with high efficiency boost regulator. With an internal 40V/1.5A power MOSFET, it is well suited for smart phone backlight applications powered by 1-cell Li-Ion battery. The supply voltage operates from 3V to 18V.
The boost output has an adaptive voltage regulation with enough low headroom voltage. The SGM3743 is capable of driving up to 10S2P white LEDs while achieving high efficiency. It supports both PWM dimming control and one-wire digital dimming control. A programmable 9-bit brightness code allows for LED brightness control.
The SGM3743 includes a comprehensive set of protection features such as 38.5V over-voltage protection, over-current protection and thermal shutdown. Built-in soft-start circuitry avoids excessive inrush current during startup.
The SGM3743 is available in a Green WLCSP-1.32×1.32-9B package. It operates over an ambient temperature range of -40℃ to +85℃.
FEATURES
Input Voltage Range: 3V to 18V
Support up to 30mA Current per String
Integrated 40V/1.5A MOSFET
Up to 90% Efficiency
Adaptive Boost Regulator
Switching Frequency: 1.2MHz
Optimized Rise Time and Fall Time to Reduce EMI on SW Pin
1% Regulated LED Current Matching and Accuracy
Very Low Headroom Voltage: 90mV
Independent Digital and PWM Dimming Control
One-Wire Digital Dimming Interface
PWM Dimming Interface
Up to 9-Bit Resolution for LED Brightness
Automatic Soft-Start for Reducing Inrush Current
Dimming Stable in More than 1:500 PWM Range
PFM Mode at Light Load
Support 4.7μH Inductor
Protection Features
Over-Voltage Protection
LED Open or Short Protection
Thermal Shutdown
-40℃ to +85℃ Operating Temperature Range
Available in a Green WLCSP-1.32×1.32-9B Package
APPLICATIONS
Smart Phones
GPS Receivers
Handheld Devices
Backlight for Media Form Factor
LCD Displays with 1-Cell Battery