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Automotive I2C-Controlled 4-Channel 150mA Backlight Driver and 4-Output TFT-LCD Bias

Industry's First Automotive TFT Bias with 4 CH LED Driver

产品详情

主要特征

应用/用途

Parametric specs for LED Drivers
VIN (V) (min) 4.75
VIN (V) (max) 42
Max. No. of LEDs 50
# LED Channels 4
LED Configuration Series-Parallel
ILED per Channel (A) (max) 0.15
PWM Dimming Freq. (kHz) (max) 20
Dimming Ratio (max) 10000
Dimming Control Digital
I2C Serial
PWM
ICC (mA) (max) 10
LED String Volt. (V) (max) 52
Switching Frequency (kHz) 400
2100
Package/Pins TQFN/40
Parametric specs for Multifunction PMICs
VIN (V) (min) 2.7
VIN (V) (max) 3.6
# Step-Down Outputs 2
# Step-Up Outputs 2
# Inverting Outputs 1
VOUT (V) (min) -24
VOUT (V) (max) 36
Package/Pins TQFN/40
Budgetary
Price (See Notes)
4.66
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参量

Parametric specs for LED Drivers
VIN (V) (min) 4.75
VIN (V) (max) 42
Max. No. of LEDs 50
# LED Channels 4
LED Configuration Series-Parallel
ILED per Channel (A) (max) 0.15
PWM Dimming Freq. (kHz) (max) 20
Dimming Ratio (max) 10000
Dimming Control Digital
I2C Serial
PWM
ICC (mA) (max) 10
LED String Volt. (V) (max) 52
Switching Frequency (kHz) 400
2100
Package/Pins TQFN/40
Parametric specs for Multifunction PMICs
VIN (V) (min) 2.7
VIN (V) (max) 3.6
# Step-Down Outputs 2
# Step-Up Outputs 2
# Inverting Outputs 1
VOUT (V) (min) -24
VOUT (V) (max) 36
Package/Pins TQFN/40
Budgetary
Price (See Notes)
4.66

主要特征

  • 4-Output TFT-LCD Bias Power
    • 2.8V to 5.5V Input for the TFT-LCD Section
    • Integrated 430kHz or 2.2MHz Boost and Buck-Boost Converters
    • Positive and Negative 10mA Gate Voltage Regulators (Tripler/Inverting Doubler) with Adjustable Output Voltage
    • Flexible Resistor-Programmable Sequencing through the SEQ Pin
    • Undervoltage Detection on All Outputs
    • Low-Quiescent-Current Standby Mode
  • 4-Channel LED Backlight Driver
    • Up to 150mA Current per Channel
    • 4.5V to 42V Input Voltage Range
    • Integrated Boost/SEPIC Controller (440kHz or 2.2MHz)
    • Dimming Ratio 10,000:1 at 200Hz
    • Adaptive Voltage Optimization to Reduce Power Dissipation in the LED Current Sinks
    • Open-String, Shorted-LED, and Short-to-GND Diagnostics
  • Low EMI
    • Phase-Shift Dimming of LED Strings
    • Spread Spectrum on LED Driver and TFT
    • Selectable Switching Frequency
  • I2C Interface for Control and Diagnostics
    • Fault Indication through the FLTB pin and I2C
    • Auto-Retry after Fault Detection
  • Overload and Thermal Protection
  • -40°C to +105°C Ambient Temperature Operation
  • 40-Pin (6mm x 6mm) TQFN Package with Exposed Pad
  • AECQ100 Grade 1

应用/用途

  • 汽车中心显示器
  • 汽车仪表盘
  • 汽车抬头显示
  • 汽车导航系统

描述

The MAX25530 is a highly integrated TFT power supply and LED backlight driver IC for automotive TFT-LCD applications. The IC integrates one buck-boost converter, one boost converter, two gate-driver supplies, and a boost/SEPIC converter that can power one to four strings of LEDs in the display backlight.

The source-driver power supplies consist of a synchronous boost converter and an inverting buck-boost converter that can generate voltages up to +18V and down to -7V. The positive source driver can deliver up to 120mA, while the negative source driver is capable of 100mA. The positive source-driver supply-regulation voltage (VPOS) is set by connecting an external resistor-divider on FBP or through I2C. The negative source-driver supply voltage (VNEG) is always tightly regulated to -VPOS (down to a minimum of -7V). The source-driver supplies operate from an input voltage between 2.8V and 5.5V.

The gate-driver power supplies consist of regulated charge pumps that generate from +28V to -21.5V and can deliver 10mA or more each depending on the exact configuration.

The IC features a quad-string LED driver that operates from a separate input voltage (VBATT) and can power up to four strings of LEDs with 150mA (max) of current per string. The IC features logic-controlled pulse-width-modulation (PWM) dimming, with minimum pulse widths as low as 500ns with the option of phase shifting the LED strings with respect to one another. When phase shifting is enabled, each string is turned on at a different time, reducing the input and output ripple, as well as audible noise. With phase shifting disabled, the current sinks turn on simultaneously and parallel connection of current sinks is possible.

The startup and shutdown sequences for all power domains are controlled using one of the seven preset modes, which are selectable through a resistor on the SEQ pin or through the I2C interface. The MAX25530 is available in a 40-pin (6mm x 6mm) TQFN package with an exposed pad, and operates over the -40°C to +105°C ambient temperature range.

简化框图

MAX25530: Simplified Block Diagram MAX25530: Simplified Block Diagram Zoom icon

技术文档

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在Maxim的知识库中搜索技术问题的答案

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