SGM37460Q

アクティブ

自動車グレード

Automotive 6-CH, 150mA (MAX) Each, Boost WLED Driver with 15000:1 Dim Ratio and I2C Interface

SGM37460Q.pdf

The SGM37460Q is a 6-channel high current LCD display backlight driver with integrated Boost converter.

The SGM37460Q adopts peak current mode control architecture for the output voltage regulation of the Boost converter. The device implements an external PMOS gate control for load disconnect. The device integrates 6 well-matched constant current sink channels to control the LED string’s brightness, and each channel is capable of providing 150mA (MAX) constant current. The device supports various dimming mode such as PWM or mix dimming and is programmable either via MIX/AD pin or I²C interface. It also has a phase-shift function to eliminate noise during PWM dimming.

The SGM37460Q integrates a 90mΩ Boost power, combined with adaptive Boost output voltage adjustment to achieve excellent efficiency. The device implements a standard I²C digital interface to maximize user programmability. The Boost converter’s switching frequency can be programmed by a resistor up to 2.2MHz (TYP), or via I²C interface. External clock signal can also be synchronized with SGM37460Q to set the Boost converter’s switching frequency.

The SGM37460Q integrates various protection features such as Boost over-current protection (OCP), Boost over-voltage protection (OVP), device over- temperature protection (OTP), LED short and open protection. In addition, the device integrates a sink current foldback feature to reduce the sink channel current when device temperature rises above +140℃.

The device is AEC-Q100 qualified (Automotive Electronics Council (AEC) standard Q100 Grade 1) and it is suitable for automotive applications.

The SGM37460Q is available in a Green TQFN-4×4- 24EL package with wettable flank.

特性

AEC-Q100 Qualified for Automotive Applications
Device Temperature Grade 1
TA = -40℃ to +125℃
Input Voltage Range: 3.5V to 36V
I²C Interface
Dedicated Fault Status Pin
Device Thermal Shutdown

Boost Converter:

Internal 90mΩ Power MOSFET
Programmable f_SW up to 2.2MHz (TYP)
External Frequency Synchronization
Low EMI Frequency Spread Spectrum
Load Disconnect Switch Control
Cycle-by-Cycle Current Limit
Short Inductor Protection
Programmable OVP Threshold

LED Sink:

Up to 6 High-Precision Current Sinks, and Support:
- 6 Channel, 10 LEDs in series at 150mA Each
- 6 Channel, 12 LEDs in series at 120mA Each
- 4 Channel, 12 LEDs in series at 150mA Each
Programmable Dimming Options:
- Direct PWM Dimming
- Analog Dimming
- Mix Dimming with 25%/12.5% Transfer Point
Phase-Shift Function
15000:1 Dim Ratio in PWM Dim at f_PWM ≤ 200Hz
255:1 Dim Ratio at Analog Dim through PWM Dim Signal Input
2.5% Channel-to-Channel Matching
Optional Over-Temperature LED Current Reduction
LED Short and Open Protections
Programmable LED Short Threshold
Available in a Green TQFN-4×4-24EL Package with Wettable Flank

アプリケーション

LCD Backlight Display Driver