SGM3146

Obsolete

8-Channel Charge Pump White LED Driver with Low Dropout Current Source

SGM3146 is obsolete. The following one or more recommended part numbers listed below can serve as improved replacements.

SGM3122

Active

PWM Dimming, Charge Pump White LED Driver with Low Dropout Current Source

SGM3124

Active

PWM Dimming, Charge Pump White LED Driver with Low Dropout Current Source

The SGM3146 is a current-regulated white LED driver with integrated low dropout current sources and a high efficiency charge pump. The charge pump has automatically selectable 1×/1.5× fractional operation modes. The SGM3146 is well suited for white LED applications powered by a Li-Ion battery due to small equivalent open-loop resistance in 1× mode.

The supply voltage operates from 2.7V to 5.5V. The SGM3146 supports up to 8 LEDs for 27mA maximum current per string. The LED reference current is set through an internal resistor. The SGM3146 contains a 4-bit digital-to-analog converter for 16-step LED current control. The LED current can be set between 1.65mA and 27mA by a serial pulse input signal into the EN/SET pin. Built-in soft-start circuitry avoids excessive inrush current during startup and mode transition.

The SGM3146 is available in a Green TQFN-3×3-20L package. It operates over an ambient temperature range of -40℃ to +85℃.

FEATURES

Input Voltage Range: 2.7V to 5.5V
Support up to 8 LEDs at 27mA Each
16-Step LED Brightness Control through One-Wire Interface
1× and 1.5× Charge Pump for High Conversion Efficiency
Switching Frequency: 0.93MHz
±4.8% Regulated LED Current Matching
Built-in Soft-Start for Reducing Inrush Current
Low Input Ripple and Low EMI
Protection Features
Over-Current Protection
Under-Voltage Lockout
Thermal Shutdown
Operating Temperature Range: -40℃ to +85℃
Available a in Green TQFN-3×3-20L Package

APPLICATIONS

White LED Backlighting

Mobile Phones, MP3s

Digital Still Cameras

LCD Displays

Ordering Information

Part Number	Status	Package	Pins	Pd-Free	RoHS	REACH	Green	MSL Rating	Operating Temperature Range	Material Content	Reliability Report	Unit Resale Price* (Volume Range: in USD)	Lead Time** (Volume Range: Days)
SGM3146YTQG20G/TR	Obsolete	TQFN-3×3-20L	20	Yes	Yes	Yes	Yes		-40℃ to +85℃	View	View

* The unit resale price is for reference purposes only. Please contact our distributors for a formal quotation.

** The lead time provided is for reference purposes only and is subject to change based on different circumstances.