SGM3747中文資料圣邦股份數(shù)據(jù)手冊(cè)PDF規(guī)格書

GENERAL DESCRIPTION

The SGM3747 is a versatile constant current LED

driver with a high efficiency step-up converter

architecture. The low-side power MOSFET is

integrated in the device, significantly shrinking the

overall PCB layout area and minimizing the total

number of external components. Unique technology

and high 1.6A current limit allow SGM3747 to drive up

to 38V output (10 LEDs in series). Alternatively,

SGM3747 can deliver 260mA total current with 3 series

LEDs per string. It can also maximize the current

capability while achieving high conversion efficiency.

The optimized 1.1MHz switching frequency results in

reduced conduction loss and small external component

size. Digital PWM dimming interface is integrated to

adjust LED current. The PWM frequency is in the range

from 2kHz to 60kHz.

Various protection features are built into the SGM3747,

including cycle-by-cycle input current limit protection,

open LED (output over-voltage) protection and thermal

shutdown protection. The leakage current in shutdown

mode is less than 1μA.

The SGM3747 is available in Green TSOT-23-6

package. It operates over an ambient temperature

range of -40℃ to +85℃

FEATURES

● Wide Output Range: Up to 10 Series LEDs

● Integrated 40V High Current Switch (1.6A Limit)

● 2.7V to 5.5V Input Voltage Range

● High Efficiency PWM Converter

● Low 200mV Feedback Voltage

● 500k? Pull-Low Resistor on CTRL Pin

● 2kHz to 60kHz PWM Dimming Frequency

● 38V Open LED Protection

● 1.1MHz Switching Frequency

● Integrated Soft-Start Function

● Less than 1μA Shutdown Current

● Dimming Stable in 1:500 Range

● Simple, Small Solution Size

● Available in Green TSOT-23-6 Package

● -40℃ to +85℃ Operating Temperature Range

APPLICATIONS

LED Backlighting

Mobile Phones

Handheld Devices

Digital Photo Frames

Automotive Navigation