MAX17115 [MAXIM]

Adjustable Output Voltages (External Resistors);


型号：	MAX17115
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Adjustable Output Voltages (External Resistors)
文件：	总6页 (文件大小：649K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-5105; Rev 0; 12/09

MAX17115 Evaluation Kit

General Description

Features

S +4.5V to +5.5V Input Range

The MAX17115 evaluation kit (EV kit) is a fully assembled

and tested surface-mount PCB that provides the voltages

and features required for thin-film transistor (TFT), liquid-

crystal display (LCD) applications. The EV kit contains

a high-performance step-up regulator, a high-accuracy,

high-voltage low-dropout (LDO) linear regulator, a posi-

tive single-stage charge pump, a negative single-stage

charge pump with a shunt voltage regulator, and a high-

performance buffer amplifier.

S Output Voltages

+16V at 500mA (Step-Up Switching Regulator)

+15V at 20mA (High-Voltage LDO Linear

Regulator)

+30V at 20mA (Positive Charge Pump)

-6.8V at 20mA (Negative Charge Pump with a

Shunt Voltage Regulator, D5)

S Adjustable Output Voltages (External Resistors)

S Selectable Frequency (640kHz/1.2MHz)

S Two High-Speed Operational Amplifiers

S Low-Profile Surface-Mount Components

S Fully Assembled and Tested

Ordering Information

PART

TYPE

MAX17115EVKIT+

EV Kit

+Denotes lead(Pb)-free and RoHS compliant.

Component List

DESIGNATION

QTY

DESCRIPTION

DESIGNATION

QTY

DESCRIPTION

10FF Q10%, 6.3V X5R ceramic

capacitors (0805)

Murata GRM21BR60J106K

.033FF Q10%, 50V X7R ceramic

capacitors (0603)

Murata GRM188R71H333K

TDK C1608X7R1H333K

C1, C2

C12, C18

10FF Q20%, 25V X5R ceramic

capacitors (1206)

Murata GRM31CR61E106K

TDK C3216X5R1E106M

2.2FF Q10%, 25V X5R ceramic

capacitor (0805)

Murata GRM219R61E225K

TDK C2012X5R1E225K

C3, C4

C13

C15

Not installed, through-hole

capacitor (OSCON-B)

Not installed, capacitor (0603)

Not installed, capacitor (1206)

1FF Q10%, 16V X5R ceramic

capacitor (0603)

Murata GRM188R61C105K

TDK C1608X5R1C105K

0.1FF Q10%, 50V X7R ceramic

capacitors (0603)

Murata GRM188R71H104K

TDK C1608X7R1H104K

C16

C17

C7, C8, C11,

C14, C19, C20

560pF Q5%, 50V X7R ceramic

capacitor (0603)

Murata GRM1885C1H561J

TDK C1608C0G1H561J

1FF Q10%, 25V X5R ceramic

capacitors (0805)

Murata GRM216R61E105K

TDK C2012X5R1E105K

C9, C10

_______________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

MAX17115 Evaluation Kit

Component List (continued)

DESIGNATION

QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

150kI Q1% resistors (0603)

100kI Q1% resistors (0603)

100kI Q5% resistors (0603)

20kI Q5% resistor (0603)

110kI Q1% resistors (0603)

10kI Q1% resistor (0603)

137kI Q1% resistor (0603)

11.5kI Q1% resistor (0603)

1kI Q5% resistor (0603)

47.5kI Q1% resistor (0603)

5.6I Q5% resistor (0603)

390I Q5% resistor (0603)

R1, R7

R2, R9, R12

R3–R6

3A, 30V Schottky diode (M-Flat)

Toshiba CMS01

Toshiba CMS02

200mA, 100V dual diodes

(SOT23)

Fairchild MMBD4148SE

(Top Mark: D4)

Central Semi CMPD7000 Lead Free

(Top Mark: C5C)

R9, R11

R10

D2, D3

R13

R14

R15

6.8V zener diode (SOT23)

Diodes, Inc BZX84C6V8

(Top Mark: KZ5)

R16

R17

R18

EN, FREQ,

HVS_EN, VDET

PCB mini test points

2-pin headers

Internal switch boost regulator

(32 TQFN-EP*)

Maxim MAX17115ETM+

JU1–JU4

3FH, 3A inductor

Sumida CDRH6D28-3R0

—

Shunts (see Tables 1–4)

PCB: MAX17115 EVALUATION KIT+

-20V, 0.063I p-channel MOSFET

(SC70 PowerPAK)

Vishay SiA443DJ

*EP = Exposed pad.

Vishay SiA411DJ

Component Suppliers

SUPPLIER

PHONE

WEBSITE

Central Semiconductor Corp.

Diodes, Inc.

631-435-1110

805-446-4800

888-522-5372

770-436-1300

847-545-6700

847-803-6100

949-623-2900

402-563-6866

www.centralsemi.com

www.diodes.com

Fairchild Semiconductor

Murata Electronics North America, Inc.

Sumida Corp.

www.fairchildsemi.com

www.murata-northamerica.com

www.sumida.com

TDK Corp.

www.component.tdk.com

www.toshiba.com/taec

www.vishay.com

Toshiba America Electronic Components, Inc.

Vishay

Note: Indicate that you are using the MAX17115 when contacting these component suppliers.

______________________________________________________________________________________

MAX17115 Evaluation Kit

least 20mA. The gate-off (VGOFF) supply voltage is

Quick Start

Recommended Equipment

•ꢀ +4.5Vꢀtoꢀ+5.5VꢀDCꢀpowerꢀsupply

•ꢀ Voltmeter

configured for a -6.8V output providing at least 20mA.

The high-performance buffer amplifier is configured for

a +6.4V output providing a 200mA output short-circuit

current.

Step-Up Regulator Output-Voltage

Selection (VMAIN)

The output voltage of the main step-up regulator is set

by connecting a resistive voltage-divider from the output

(VMAIN) to AGND with the center tap connected to FB.

Select R14 in the 10kI to 50kI range. Calculate R13

with the following equation:

Procedure

The MAX17115 EV kit is fully assembled and test-

ed. Follow the steps below to verify board operation.

Caution: Do not turn on the power supply until all

connections are completed.

1) Verify that all jumpers are in their default positions

(see the Jumper Selection section).

2) Connect the positive terminal of the power supply

to the VIN pad. Connect the negative terminal of the

power supply to the PGND pad.









VMAIN

R13 = R14×

−1





3) Turn on the power supply and verify that the step-up

switching regulator output (VMAIN) is +16V.

where V , the step-up regulator’s feedback set point,

is 1.24V.

4) Verify that the LDO linear regulator output (VREF_O)

is approximately +15V.

High-Voltage LDO Linear Regulator

Output-Voltage Selection (VREF_O)

The output voltage of the high-accuracy LDO linear

regulator is set by connecting a resistive voltage-divider

from the output (VREF_O) to AGND with the center tap

connected to VREF_FB. Select R10 in the 10kI to 50kI

range. Calculate R9 with the following equation:

5) Verify that the gate-on supply (VGON) is approxi-

mately +30V.

6) Verify that the gate-off supply (VGOFF) is approxi-

mately -6.8V.

7) Verify that the buffer amplifier (OPO) is approximately

+6.4V.





VREF_0

R9 = R10 ×

−1





VREF_FB





Detailed Description of Hardware

The MAX17115 EV kit contains a high-performance step-

up regulator, a high-accuracy, high-voltage low-dropout

(LDO) linear regulator, a positive single-stage charge

pump, a negative single-stage charge pump with a

shunt voltage regulator, and a high-performance buffer

amplifier. The EV kit operates from a DC power supply

between +4.5V and +5.5V.

where V

point, is 1.24V.

, the LDO linear regulator’s feedback set

VREF_FB

Buffer Amplifier Output-Voltage Selection (OPO)

The output voltage of the buffer amplifier is set by

connecting a resistive voltage-divider from the output

(VMAIN) to AGND with the center tap connected to OPI.

Calculate R1 with the following equation:

Although the MAX17115 IC has a +2.5V to +5.5V input

supply range, the EV kit is optimized to operate from

a DC supply voltage of +4.5V to +5.5V. The step-up

switching regulator is configured for a +16V output pro-

viding at least 500mA. The high-accuracy, high-voltage

LDO linear regulator is configured for a +15V output

providing at least 20mA. The gate-on (VGON) supply

voltage is configured for a +30V output providing at









VMAIN

R1= R2×

−1





OPI

where V , the buffer amplifier’s noninverting input,

OPI

equals the desired buffer output (OPO).

_______________________________________________________________________________________

MAX17115 Evaluation Kit

High-Voltage Stress Control Input (HVS_EN)

Connect HVS_EN to VIN to turn on the internal switch

between RHVS and AGND. Connect HVS_EN to AGND

to make the RHVS pin high-impedance. See Table 3 for

jumper JU3 functions.

Jumper Selection

Several jumper settings in the following tables illustrate

features of the MAX17115 EV kit.

Enable Control Input (EN)

Connect EN to AGND to disable the step-up switching

regulator operation. Connect EN to VIN to enable the

boost operation. See Table 1 for jumper JU1 functions.

High-Voltage Switch Control Input (VFLK)

When VFLK is connected to VIN, the high-voltage switch

between VGH and VGHM is on and the high-voltage

switch between VGHM and DRN is off. When VFLK

is connected to AGND, the switch between VGH and

VGHM is off and the switch between VGHM and DRN is

on. See Table 4 for jumper JU4 functions.

Frequency Select Input (FREQ)

Connect FREQ to AGND to select the step-up regula-

tor’s 640kHz operating frequency. Connect FREQ to

VIN to select the step-up regulator’s 1.2MHz operating

frequency. See Table 2 for jumper JU2 functions.

Table 1. Jumper JU1 Functions

Table 3. Jumper JU3 Functions

SHUNT

POSITION

EV KIT

OUTPUTS

SHUNT

POSITION

EN PIN

HVS_EN PIN

RHVS

Outputs disabled

(VMAIN = 0V)

HVS_EN connected to

VIN

RHVS connected

to AGND

Installed

EN connected to AGND

Installed

Not

installed*

EN connected to VIN

through R3

Outputs enabled

(VMAIN = 16V)

Not

installed*

HVS_EN connected to

AGND through R5

RHVS at high

impedance

*Default position.

Table 2. Jumper JU2 Functions

Table 4. Jumper JU4 Functions

SHUNT

POSITION

SHUNT

POSITION

OPERATION OF

FREQUENCY

VFLK

VGHM

VGHM = VGON

VGHM = V

FREQ PIN

Installed*

VFLK connected to VIN

FREQ connected to

AGND

Installed

640kHz

Not

installed

VFLK connected to

AGND through R6

DRN

Not

installed*

FREQ connected to VIN

through R4

1.2MHz

*Default position.

______________________________________________________________________________________

MAX17115 Evaluation Kit

Figure 1. MAX17115 EV Kit Schematic

_______________________________________________________________________________________

MAX17115 Evaluation Kit

1.0”

Figure 2. MAX17115 EV Kit Component Placement Guide—

Component Side

Figure 3. MAX17115 EV Kit PCB Layout—Component Side

1.0”

Figure 4. MAX17115 EV Kit PCB Layout—Solder Side

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.

Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

MAX17115 [MAXIM]

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