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SG Micro

SGM3758 Datasheet Preview

SGM3758 Datasheet

Boost WLED Driver

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SGM3758
38V High Efficiency, Boost WLED Driver
with Strobe Interface for Flash Mode
GENERAL DESCRIPTION
With a 40V rated integrated switch FET, the SGM3758
is a boost converter that drives LEDs in series. The
boost converter has a 40V, 3A internal MOSFET; thus it
can drive single or parallel LED strings for small to
large size panel backlighting. And it is quite suitable for
smart phone image capture using display device as a
flash mode light source, as it can output up to 200mA
current at 30V for 320ms when the strobe signal is
active.
The backlight mode default white LED current is set
with the external sensor resistor, RSET, and the
feedback voltage is regulated to 200mV, as shown in
the typical application. During the operation, the LED
current can be controlled by a pulse width modulation
(PWM) signal applied to the CTRL pin, through which
the duty cycle determines the feedback reference
voltage. The SGM3758 does not burst the LED current;
therefore, it does not generate audible noises on the
output capacitor. For maximum protection, the device
features integrated open LED protection that disables
the SGM3758 to prevent the output voltage from
exceeding the IC absolute maximum voltage ratings
during open LED conditions.
When the device is working, if the STROBE pin is
pulled up, it will turn on flash mode within 100µs. And
the feedback voltage is regulated to 5× of the backlight
mode that determined by the PWM signal duty cycle.
And it will turn to backlight mode within 100µs when the
STROBE pin is pulled down or the strobe signal keeps
high over the 320ms timer.
The SGM3758 is available in Green TDFN-2×2-6L
package. It operates over an ambient temperature
range of -40to +85.
FEATURES
Input Voltage Range: 2.7V to 5.5V
Integrated 3A/40V MOSFET
Output Voltage Up to 38V (OVP)
Output Current Up to 200mA @ 30V
Accumulated 320ms Flash Timer Control
1.2MHz Switching Frequency
PWM Dimming Control Interfaces
PWM Frequency: 20kHz ~ 100kHz
Strobe Interface for Image Capture Mode
Up to 87% Efficiency for 7S2P LEDs
Up to 92% Efficiency for 3S20P LEDs
Dimming Stable in 1:500 Range
200mV Feedback Voltage in Backlight Mode
1000mV Feedback Voltage in Flash Mode
Flash Mode Under-Voltage Lockout
Built-In Soft-Start Function
Over-Voltage Protection
Built-In WLED Open/Short Protection
PFM Mode at Light Load
Thermal Shutdown
-40to +85Operating Temperature Range
Available in Green TDFN-2×2-6L Package
APPLICATIONS
Smart Phones
PDAs, Handheld Computers
Backlight for Small and Media Form-Factor LCD
Displays with Single-Cell Battery Input
SG Micro Corp
www.sg-micro.com
NOVEMBER 2017 – REV. A




SG Micro

SGM3758 Datasheet Preview

SGM3758 Datasheet

Boost WLED Driver

No Preview Available !

SGM3758
38V High Efficiency, Boost WLED Driver
with Strobe Interface for Flash Mode
PACKAGE/ORDERING INFORMATION
MODEL
SGM3758
PACKAGE
DESCRIPTION
TDFN-2×2-6L
SPECIFIED
TEMPERATURE
RANGE
-40to +85
ORDERING
NUMBER
SGM3758YTDI6G/TR
PACKAGE
MARKING
3758
XXXX
PACKING
OPTION
Tape and Reel, 3000
NOTE: XXXX = Date Code.
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
ABSOLUTE MAXIMUM RATINGS
Voltages on VIN, CTRL, STROBE, FB ................ -0.3V to 6V
Package Thermal Resistance
TDFN-2×2-6L, θJA .................................................... 120/W
Voltage on SW ................................................... -0.3V to 40V
Junction Temperature.................................................+150
Storage Temperature Range ........................ -65to +150
Lead Temperature (Soldering, 10sec) ........................+260
ESD Susceptibility
HBM............................................................................. 3000V
MM................................................................................. 200V
CDM ............................................................................ 1000V
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range ...........................................2.7V to 5.5V
Output Voltage Range ........................................... VIN to 38V
Inductor........................................................... 4.7μH to 22μH
Input Capacitor ...................................................... 1μF (MIN)
Output Capacitor................................................. 1μF to 10μF
Operating Temperature Range ....................... -40to +85
OVERSTRESS CAUTION
Stresses beyond those listed may cause permanent damage
to the device. Functional operation of the device at these or
any other conditions beyond those indicated in the operational
section of the specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
reliability.
ESD SENSITIVITY CAUTION
This integrated circuit can be damaged by ESD if you don’t
pay attention to ESD protection. SGMICRO recommends that
all integrated circuits be handled with appropriate precautions.
Failure to observe proper handling and installation procedures
can cause damage. ESD damage can range from subtle
performance degradation to complete device failure. Precision
integrated circuits may be more susceptible to damage
because very small parametric changes could cause the
device not to meet its published specifications.
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, specification or other related things if necessary
without notice at any time.
SG Micro Corp
www.sg-micro.com
NOVEMBER 2017
2



Part Number SGM3758
Description Boost WLED Driver
Maker SG Micro
Total Page 3 Pages
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SGM3758 Datasheet PDF





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