回到顶部

Integrated TFT Power Supply and LED Backlight Drivers

Integrated TFT Power Supplies and LED Backlight Driver Reduce System Component Count

产品详情

主要特征

应用/用途

Parametric specs for LED Drivers
VIN (V) (min) 2.7
VIN (V) (max) 5.5
Max. No. of LEDs 24
# LED Channels 2
Regulation Topology Inductor Based
LED Configuration Series-Parallel
ILED per Channel (A) (max) 0.16
PWM Dimming Freq. (kHz) (max) 20
Dimming Ratio (max) 10000
Dimming Control PWM
POUT (W) 12
ICC (mA) (max) 2.2
LED String Volt. (V) (max) 52
Switching Frequency (kHz) 1000
Package/Pins TQFN/32
Budgetary
Price (See Notes)
5.17
Parametric specs for Multifunction PMICs
VIN (V) (min) 2.7
VIN (V) (max) 5.5
# Step-Up Outputs 2
# Inverting Outputs 2
VOUT (V) (max) 15
Package/Pins TQFN/32
查看更多

简化框图

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心

参量

Parametric specs for LED Drivers
VIN (V) (min) 2.7
VIN (V) (max) 5.5
Max. No. of LEDs 24
# LED Channels 2
Regulation Topology Inductor Based
LED Configuration Series-Parallel
ILED per Channel (A) (max) 0.16
PWM Dimming Freq. (kHz) (max) 20
Dimming Ratio (max) 10000
Dimming Control PWM
POUT (W) 12
ICC (mA) (max) 2.2
LED String Volt. (V) (max) 52
Switching Frequency (kHz) 1000
Package/Pins TQFN/32
Budgetary
Price (See Notes)
5.17
Parametric specs for Multifunction PMICs
VIN (V) (min) 2.7
VIN (V) (max) 5.5
# Step-Up Outputs 2
# Inverting Outputs 2
VOUT (V) (max) 15
Package/Pins TQFN/32

主要特征

  • Integrates Both TFT Power Supplies and LED Backlight Driver in One IC, Reducing Component Count
  • Alleviates EMI Due to Spread Spectrum on Both Source Driver Supplies and LED Driver
  • 10000:1 Dimming Ratio at 200Hz Dimming Frequency
  • Available in a 32-Pin (5mm × 5mm) TQFN with an Exposed Pad for Heat Dissipation and Operates Over the -40°C to +105°C Ambient Temperature Range

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 MAX20070/MAX20070B are highly integrated power supplies and LED backlight drivers for automotive TFT-LCD applications. The devices integrate one buck-boost converter, one boost converter, two gate-driver supplies, and a boost/SEPIC converter that can power one to two strings of LEDs in the display backlight.

The source-driver power supplies consist of a boost converter and an inverting buck-boost converter that can generate voltages up to +15V and -15V. Both source-driver power supplies can deliver up to 100mA. The positive source-driver supply regulation voltage (VPOS) is set by connecting an external resistor-divider on FBP. Connecting the FBP pin to ground sets the regulation voltage (VPOS) to +6.5V. The negative source-driver supply voltage (VNEG) is always tightly regulated to -VPOS within ±50mV. The source-driver supplies use an input voltage from 2.7V to 5.5V to generate the output voltages.

The gate-driver power supplies consist of regulated charge pumps that generate up to +22V and -22V and can deliver up to 3mA each. The regulation voltage (VGVDD) on the positive charge pump is set by a resistor-divider on FBPG; the regulation voltage (VGVEE) on the negative charge pump is set by a resistor-divider on FBNG.

The ICs feature a dual-string LED driver that operates off a separate input voltage (VBATT) and can power up to two strings of LEDs with 160mA (max) of current per string.

The startup and shutdown sequences for all power domains is controlled using one of the seven preset modes that are selectable through a resistor on SEQ.

The MAX20070/MAX20070B are available in a 32-pin, 5mm × 5mm TQFN package with an exposed pad, and operates over the -40°C to +105°C ambient temperature range.

简化框图

MAX20070, MAX20070B: Simplified Operating Circuit MAX20070, MAX20070B:Simplified Operating Circuit Zoom icon

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心