MAX17079 데이터 시트보기 (PDF) - Maxim Integrated

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MAX17079

4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display

Maxim Integrated 

4-Level or 2-Level Logic to High-Voltage

Level Shifter for TFT LCD TV Display

Startup

The MAX17079 supply rail voltages should satisfy the

startup sequence shown in Figure 4. The supply rail

voltages should also satisfy the following conditions:

VLS ≥ VH1 ≥ (VH2, VL2, VCOM) ≥ VL1

For proper operation, EN should be HIGH only after all

the supply rails are ON.

Figure 4. Startup Sequence

VLS

VH1

VH2

VCOM

VL2

VCC

VL1

EN

TIME

Load Characteristics

The load has a typical characteristic of large TFT LCD

panels. During state transitions, a built-in dead time

prevents shoot-through current. During dead time as

the output is not connected, the output can be affected

by the panel load. To avoid voltage spikes during the

deadline, 1nF to 4.7nF capacitors can be added at

each output.

PCB Layout Guidelines

Careful PCB layout is important for proper operation.

Use the following guidelines for good PCB layout:

• The MAX17079 has a backside pad to dissipate

heat. Do not route any trace around or under the

backside pad.

• Ensure good decoupling of supply rails and put the

bypass capacitor for each power supply very close

to the pin.

• Create an analog ground island (AGND) that

includes the AGND pin and the VCC bypass capaci-

tor to ground. Connect AGND to the backside pad

directly under the IC. Create a power ground plane

(DGND) that includes the DGND pin, the remaining

supply rails bypass capacitor grounds, and output

bypass capacitors, if used in the system. Connect

DGND to the backside pad directly under the IC.

Other than the backside connection, avoid connect-

ing AGND and DGND.

PROCESS: BiCMOS

Chip Information

Package Information

For the latest package outline information and land patterns, go

to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in

the package code indicates RoHS status only. Package draw-

ings may show a different suffix character, but the drawing per-

tains to the package regardless of RoHS status.

PACKAGE TYPE PACKAGE CODE DOCUMENT NO.

40 TQFN

T4066+5

21-0141

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