MAX20070, MAX20070B

Integrated TFT Power Supply and LED Backlight Drivers

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


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说明

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.
MAX20070, MAX20070B: Simplified Operating Circuit MAX20070, MAX20070B:Simplified Operating Circuit 放大+

关键特性

  • 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

  • 汽车中心显示器
  • 汽车仪表盘
  • 汽车抬头显示
  • 汽车导航系统
Part NumberRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
(A)
PWM Dimming Freq.
(kHz)
Dimming RatioDimming ControlPOUT
(W)
VIN
(V)
VIN
(V)
ICC
(mA)
LED String Volt.
(V)
Oper. Freq.
(kHz)
Package/PinsBudgetary
Price
maxmaxmaxminmaxmaxmaxSee Notes
MAX20070 Inductor Based242Series-Parallel0.162010000PWM122.75.52.2521000
See Data Sheet
$4.65 @1k
MAX20070B 2100
TQFN/32
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Part NumberPrimary TopologyMonitor/Control FeaturesDC-DC/Power FeaturesLCD/LED/Flash/CCD FeaturesVIN
(V)
VIN
(V)
VOUT
(V)
Max. IOUT
(A)
Inverting OutputsPackage/Pins
minmaxmax
MAX20070 
Inverting
Step-Up
Dynamic V Adj.
Output OVP
Output UVP
Reset Output
Shutdown
Current Limit
Fixed Freq./PWM
Internal Switch
Soft Start
TFT Bias
White LED
2.75.5150.12
TQFN/32
TQFN-CU/32
查看所有Multifunction PMICs (83)
Pricing Notes:
价格仅供参考,用于同类产品的比较。所提供报价为美元,需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题,请参考:价格与供货网站或与指定代理商联系。


MAX20070EVKIT: MAX20070/MAX20070B评估板

质量和环境数据

申请可靠性报告: MAX20070  MAX20070B 
无铅封装的锡(Sn)晶须报告
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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相关资料


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类型 编号 标题
评估板8701MAX20070EVKIT MAX20070/MAX20070B评估板