The SGM3743 is dual-channel WLED driver which provides highly integrated solutions for single-cell Li-ion battery powered smart phone backlight. The device has a built-in high efficiency boost regulator with integrated 1.5A/40V power MOSFET and supports as low as 3V input voltage. With two high current-matching capability current sink regulators, the device can drive up to 10S2P WLED diodes. The boost output can automatically adjust to the WLED forward voltage and allow very low voltage headroom control, thus to improve LED strings efficiency effectively.
The SGM3743 support both of the PWM dimming interface and one wire digital dimming interface and can realize 9-bit brightness code programming. The SGM3743 integrates built-in soft-start, over-voltage, over-current protection, and thermal shutdown protection.
The SGM3743 is available in a Green WLCSP-1.32×1.32-9B package and operates over the -40℃ to +85℃ temperature range.
3V to 18V Input Voltage Range
Integrated 1.5A/40V MOSFET
1.2MHz Switching Frequency
Optimized Rise Time and Fall Time to Control EMI for SW Pin
Dual Current Sinks of up to 30mA Current Each
1% Typical Current Matching and Accuracy
38.5V OVP, 1.2MHz Frequency
Adaptive Boost Output to WLED Voltages
Very Low Voltage Headroom Control (90mV)
Flexible Digital and PWM Brightness Control
One Wire Control Interface
PWM Dimming Control Interface
Up to 9-Bit Dimming Resolution
Up to 90% Efficiency
Built-In Soft-Start Function
Over-Voltage Protection
Built-In WLED Open/Short Protection
Dimming Stable in More than 1:500 PWM Range
PFM Mode at Light Load
Thermal Shutdown
Support 4.7μH Inductor Application
-40℃ to +85℃ Operating Temperature Range
Available in a Green WLCSP-1.32×1.32-9B Package
Smart Phones
PDAs, Handheld Computers
GPS Receivers
Backlight for Small and Media Form Factor
LCD Display with Single-Cell Battery Input
| Part Number | Status | Package | Pins | Pb-Free | Temp Range | |
| SGM3743YG/TR | Production | WLCSP-1.32×1.32-9B | 9 | Y | -40℃ to +85℃ | Samples |
