The SGM3760 and SGM3760A are 2-channel screen flash white LED drivers with high efficiency boost regulator. With an internal 40V/3.6A power MOSFET, they are well suited for smart phone backlight applications powered by 1-cell Li-Ion battery. The supply voltage operates from 2.7V to 5.5V.
The boost output has an adaptive voltage regulation with enough low headroom voltage. The SGM3760/A are capable of driving up to 10S2P white LEDs while achieving high efficiency.
The SGM3760/A are designed for smart phone image capture using display device as a screen flash mode light source, as they are capable of driving up to 80mA/60mA current per channel at 32V for 330ms when the strobe signal is active.
The backlight mode default white LED current is programmed by an external RISET resistor. During the operation, the LED current can be controlled by applying a PWM signal to the PWM pin.
When the device is in operation and the STRB pin is pulled up, the SGM3760/A will enter flash mode within 50μs. The output current is regulated to 4× for SGM3760 and 3× for SGM3760A of the backlight mode voltage that is determined by the PWM signal duty cycle. When the STRB pin is pulled down or the strobe signal remains high for longer than the 330ms timer, the SGM3760/A will enter backlight mode within 50μs.
The SGM3760/A includes various protections such as built-in soft-start, over-voltage protection, over-current protection, and thermal shutdown.
The SGM3760/A are available in a Green WLCSP-1.32×1.32-9B package and operate over the -40℃ to +85℃ temperature range.
Input Voltage Range: 2.7V to 5.5V
Integrated 40V/3.6A Switch
Up to 90% Efficiency
Adaptive Boost Regulator
Switching Frequency: 1.15MHz
Optimized Rise Time and Fall Time to Reduce EMI on SW Pin
Dual Current Sinks
Up to 30mA Current Each in Backlight Mode
SGM3760: 4× Output Current in Screen Flash Mode for 330ms Timeout
SGM3760A: 3× Output Current in Screen Flash Mode for 330ms Timeout
1% Regulated LED Current Matching and Accuracy
Very Low Headroom Voltage: 150mV
PWM Dimming Interface
Dimming Stable in More than 1:500 PWM Range
PFM Mode at Light Load
Automatic Soft-Start for Reducing Inrush Current
Protection Features
41.5V 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
PDAs, Handheld Computers
Backlight for Media Form Factor LCD Displays with 1-Cell Battery Input
