SGM3727 Datasheet, PDF (1/13 Pages) SG Micro Corp – High Efficiency 38V Step-Up WLED Driver

SGM3727
High Efficiency,
38V Step-Up WLED Driver
GENERAL DESCRIPTION
The SGM3727 is a step-up DC/DC converter designed
for driving the white LEDs with an externally
programmable constant current. This device features
integrated, 38V power MOSFET that is capable of driving
up to 10 white LEDs in series, providing inherent current
matching for uniform brightness. WLED brightness
adjustment is easily achieved via a single wire interface,
totally 32 brightness levels of LED Dimming.
The SGM3727 features a variety of protection circuits,
including integrated over-voltage protection (OVP),
soft-start, cycle-by-cycle current limiting, and thermal
shutdown protection circuitry.
FEATURES
● High-Efficiency Boost DC/DC WLED Bias Supply
● Internal 38V, 0.5Ω Power MOSFET
● Up to 10 Serial White LEDs per String
● Switch Current Limit: 1A
● Single Wire Interface 32 Brightness Levels for LED
Dimming
● Programmable OVP Voltage
● Soft-Start Function
● No Leakage from V_IN to GND through LED String
● Thermal Shutdown
● Cycle-by-Cycle Over-Current Protection
● -40℃ to +85℃ Operating Temperature Range
● Available in Green TDFN-2×2-8L Package
The SGM3727 has 1A current limit. It is available in
Green TDFN-2×2-8L package. It operates over an
ambient temperature range of -40°C to +85°C.
TYPICAL APPLICATION
L1
APPLICATIONS
TFT LCD Displays
Smart Phones
Portable Media Players
GPS/Personal Navigation Devices
V_IN
2.8V to 5.0V
C_IN
Enable and
Brightness Control
2 _VDD
D1
SW ⁸
R_VO2
SGM3727 ^{OVP 7}
R_VO1
3 _EN/SET
GND
1
FB ⁶
RSET ⁵
RS
Up to
10 WLEDs
V_OUT
C_OUT
SG Micro Corp
www.sg-micro.com
REV. A. 1