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MAX20070 数据表(PDF) 1 Page - Maxim Integrated Products |
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MAX20070 数据表(HTML) 1 Page - Maxim Integrated Products |
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1 / 34 page  General Description The MAX20070 is a highly integrated power supply and LED backlight driver for automotive TFT-LCD applications. The device integrates 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 IC features 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 device is available in a 32-pin, 5mm x 5mm TQFN package with an exposed pad, and operates over the -40°C to +105°C ambient temperature range. Benefits and Features ● 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 ● 5000:1 Dimming Ratio at 200Hz Dimming Frequency ● Available in a 32-Pin (5mm x 5mm) TQFN with an Exposed Pad for Heat Dissipation and Operates Over the -40°C to +105°C Ambient Temperature Range Ordering Information and Simplified Operating Circuit appear at end of data sheet. 19-7118; Rev 0; 9/14 Applications ● Automotive Dashboards ● Automotive Central Information Displays ● Automotive Head-Up Displays ● Automotive Navigation Systems Simplified Operating Circuit D1 L1 BATTERY INPUT FAULT OUTPUT ENABLE INPUT BATT EP EN GND SEQ DN DP PGVDD IN DGVEE DGVDD FBPG FBNG REF C1 C2 C21 R15 C13 R11 C22 DIM INPUT D13 C23 C12 C5 C6 L2 D2 VPOS VNEG TFT POWER INPUT C7 C9 VGVDD VGVEE C10 C19 C14 C11 C20 D3-2 D5 D11 D6 MAX20070 D12 L3 R16 C3 D3-1 FLT LGND LGND AGND LGND AGND AGND AGND AGND R12 LGND VCC DRAIN PGND COMP CS OVP ISET DIM OUT1 OUT2 LX FBP INN HVINP POS NEG LXN LGND TFT POWER INPUT R17 TFT POWER INPUT R5 R4 R6 R7 R8 LGND AGND MAX20070 Integrated TFT Power Supply and LED Backlight Driver |
类似零件编号 - MAX20070 |
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类似说明 - MAX20070 |
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