MAX1516 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

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MAX1516

TFT-LCD DC-DC Converters with Operational Amplifiers

Maxim Integrated 

TFT-LCD DC-DC Converters with

Operational Amplifiers

Pin Description (continued)

NAME

PIN

MAX1516 MAX1517 MAX1518

FUNCTION

20

N.C.

N.C.

OUT5

Operational-Amplifier 5 Output. Not Internally Connected for the MAX1517 and

MAX1516.

21

LX

LX

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

IN

IN

Supply Voltage Input. IN can range from 2.6V to 5.5V.

Step-Up Regulator Feedback Input. Regulates to 1.236V (nominal). Connect a resistive

23

FB

FB

FB

voltage-divider from the output (VMAIN) to FB to analog ground (AGND). Place the

divider within 5mm of FB.

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

24

COMP

COMP

COMP COMP to AGND. See the Loop Compensation section for component selection

guidelines.

25

FBP

26

DRVP

27

FBN

28

DRVN

29

DEL

30

CTL

31

DRN

32

COM

FBP

DRVP

FBN

DRVN

DEL

CTL

DRN

COM

FBP

DRVP

FBN

DRVN

DEL

CTL

DRN

COM

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

FBP to the 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

close to the pin.

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 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 close to the pin.

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.

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 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 and

when the voltage on DEL is less than 1.25V.

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

connected to COM.

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

COM to exceed VSRC.

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