MAX8795AETJ-T 查看數據表（PDF） - Maxim Integrated

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MAX8795AETJ-T

TFT-LCD DC-DC Converter with Operational Amplifiers

Maxim Integrated 

TFT-LCD DC-DC Converter with

Operational Amplifiers

Pin Description (continued)

PIN

NAME

FUNCTION

17

OUT4 Operational-Amplifier 4 Output

18

POS5 Operational-Amplifier 5 Noninverting Input

19

NEG5 Operational-Amplifier 5 Inverting Input

20

OUT5 Operational-Amplifier 5 Output

21

LX

n-Channel Power MOSFET Drain and Switching Node. Connect the inductor and Schottky diode to LX

and minimize the trace area for lowest EMI.

22

IN

Supply Voltage Input. IN can range from 2.5V to 6V.

23

FB

Step-Up Regulator Feedback Input. Regulates to 1.233V (nominal). Connect a resistive voltage-divider

from the output (VMAIN) to FB to analog ground (AGND). Place the divider within 5mm of FB.

24

COMP

Step-Up Regulator Error-Amplifier Compensation Point. Connect a series RC from COMP to AGND.

See the Loop Compensation section for component selection guidelines.

Gate-On Linear-Regulator Feedback Input. FBP regulates to 1.25V (nominal). Connect FBP to the

25

FBP

center of a resistive voltage-divider between the regulator output and AGND to set the gate-on linear-

regulator output voltage. Place the resistive voltage-divider within 5mm of FBP.

26

DRVP

Gate-On Linear-Regulator Base Drive. Open drain of an internal n-channel MOSFET. Connect DRVP to

the base of an external pnp pass transistor. See the Pass-Transistor Selection section.

Gate-Off Linear-Regulator Feedback Input. FBN regulates to 250mV (nominal). Connect FBN to the

27

FBN

center of a resistive voltage-divider between the regulator output and REF to set the gate-off linear-

regulator output voltage. Place the resistive voltage-divider within 5mm of FBN.

28

DRVN

Gate-Off Linear-Regulator Base Drive. Open drain of an internal p-channel MOSFET. Connect DRVN to

the base of an external npn pass transistor. See the Pass-Transistor Selection section.

29

DEL

High-Voltage Switch Delay Input. Connect a capacitor from DEL to AGND to set the high-voltage

switch startup delay.

High-Voltage Switch Control Input. When CTL is high, the high-voltage switch between COM and SRC

30

CTL

is on and the high-voltage switch between COM and DRN is off. When CTL is low, the high-voltage

switch between COM and SRC is off and the high-voltage switch between COM and DRN is on. CTL is

inhibited by the undervoltage lockout or when the voltage on DEL is less than 1.25V.

31

DRN

Switch Input. Drain of the internal high-voltage back-to-back p-channel MOSFETs connected to COM.

32

COM

Internal High-Voltage MOSFET Switch Common Terminal. Do not allow the voltage on COM to exceed

VSRC.

—

EP

Exposed Paddle. Must be connected to AGND. Do not use as the only ground connection.

14 ______________________________________________________________________________________

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