MAX17122EVKIT [MAXIM]

Greater than 94% Efficiency (Step-Up Switching Regulator);


型号：	MAX17122EVKIT
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Greater than 94% Efficiency (Step-Up Switching Regulator)
文件：	总7页 (文件大小：628K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-5089; Rev 0; 12/09

MAX17122 Evaluation Kit

General Description

Features

The MAX17122 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) TV panels. The EV kit includes a

step-down regulator, step-up regulator, negative output

buck-boost regulator, positive regulated charge pump,

and a negative linear regulator.

S +10V to +14V Input Range

S 750kHz Switching Frequency

S Output Voltages

+15V Output at 2.2A (Step-Up Switching

Regulator)

+3.3V Output at 2.5A (Step-Down Switching

Regulator)

The MAX17122 IC operates from +10V to +14V input

voltages and is optimized for LCD TV panels running

directly from +12V supplies. The step-up switching

regulator is configured for a +15V output that provides at

least 2.2A with an input voltage of +12V. The step-down

regulator is configured for a +3.3V output that provides

at least 2.5A and the buck-boost is configured for a

temperature-variable -12V to -20V output that provides

at least 450mA. The positive regulated charge pump is

configured for a +28V output providing at least 100mA.

The negative linear regulator is configured for a -7.5V

output providing at least 100mA.

-12V to -20V Output at 450mA (Temperature-

Variable Buck-Boost Switching Regulator)

+28V Output at 100mA (Positive Charge Pump)

-7.5V Output at 100mA (Negative Linear

Regulator)

+5V Output at 25mA (Linear Regulator VL)

S Greater than 94% Efficiency (Step-Up Switching

Regulator)

S Fully Assembled and Tested

Ordering Information

PART

TYPE

MAX17122EVKIT+

EV Kit

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

Component List

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

22FF Q20%, 16V X5R ceramic

capacitors (1206)

Murata GRM31CR61C226M

Taiyo Yuden EMK316BJ226M

1FF Q10%, 25V X5R ceramic

capacitors (0603)

Murata GRM188R61E105K

TDK C1608X5R1E105M

C1, C2

C6, C16

C7, C8, C15,

C23, C24, C25

Not installed, ceramic capacitors

(0603)

0.1FF Q10%, 50V X7R ceramic

capacitors (0603)

Murata GRM188R71H104K

TDK C1608X7R1H104K

C3, C9, C11,

C13

2.2FF Q10%, 16V X5R ceramic

capacitor (0603)

Murata GRM188R61C225K

TDK C1608Y5V1C225ZT

C12

C14

C17

22FF Q20%, 6.3V X5R ceramic

capacitor (0805)

Murata GRM21BR60J226M

TDK C2012X5R0J226K

1FF Q10%, 50V X7R ceramic

capacitor (1206)

Murata GRM31MR71H105KA

TDK C3216X7R1H105K

0.22FF Q10%, 25V X7R ceramic

capacitors (0603)

Murata GRM188R71E224K

TDK C1608X7R1E224K

C5, C10

470pF Q10% 50V X7R ceramic

capacitor (0603)

Murata GRM188R71H471K

TDK C1608X7R1H471K

_______________________________________________________________ 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.

MAX17122 Evaluation Kit

Component List (continued)

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

22FF Q20%, 25V X5R ceramic

capacitors (1210)

Murata GRM32ER61E226K

Murata GRM32ER61E226M

High-gain, +25V npn transistor

(DPAK)

Fairchild KSH200

On Semi MJD200

C18, C21, C22

10FF Q10%, 16V X5R ceramic

capacitor (0805)

Murata GRM21BR61C106K

KEMET C0805C106K4PAC

High-gain, -25V pnp transistor

(DPAK)

Fairchild KSH210

On Semi MJD210

C19

-30V, 0.056Ip-channel MOSFET

(6 SC70 PowerPAK)

Vishay SiA421DJ

330pF Q10%, 50V X7R ceramic

capacitor (0603)

Murata GRM188R71H331K

TDK C1608X7R1H331K

C20

365kI Q1% resistor (0603)

33.2kI Q1% resistor (0603)

39.2kI Q1% resistor (0603)

324kI Q1% resistor (0603)

182kI Q1% resistor (0603)

22.1kI Q1% resistors (0603)

47.5kI Q1% resistors (0603)

12pF Q5%, 50V C0G ceramic

capacitors (0603)

Murata GRM1885C1H120J

TDK C1608C0G1H120J

C26, C27

C28

R6, R13

R7, R22

15pF Q5%, 50V C0G ceramic

capacitor (0402)

Murata GRM1555C1H150J

TDK C1005C0G1H150J

10kI Q1% NTC resistor (0402)

Murata NCP15XH103F03RC

Not installed, through-hole

OSCON capacitor

(OSCON-B)

R10, R16

R11

8.25kI Q1% resistor (0603)

510I Q5% resistors (0603)

226kI Q1% resistor (0603)

10.5kI Q1% resistor (0603)

82.5kI Q1% resistor (0603)

10kI Q1% resistors (0603)

100kI Q5% resistors (0603)

C36

D1, D2

30V, 3A Schottky diodes (M flat)

Toshiba CMS02

R12

R14

50V, 1A Schottky diode (SMA)

Fairchild SS15

Diodes, Inc. B150

R15, R20

R17, R18

Not installed, resistors (0603)

R19 is PC short; R21 and R24

are open

Small-signal diode (SOT23)

Fairchild BAT54S

Diodes, Inc. BAT54S

R19, R21, R24

R23

7.5kI Q1% resistor (0603)

GATE, SS, TP1,

TP2

TFT LCD power supply

(40 TQFN-EP*)

Maxim MAX17122ETL+

Test points

JU1–JU4

2-pin headers

—

Shunts

4.7FH, 3.5A inductors

TOKO FDV0620-4R7M

Sumida CDRH6D26HPNP-4R7P

NEC TOKIN MPLC0730L4R7

PCB: MAX17122 EVALUATION

KIT+

L1, L2

—

*EP = Exposed pad.

22FH, 1.6A inductor

Sumida CDRH8D28NP-220N

______________________________________________________________________________________

MAX17122 Evaluation Kit

Component Suppliers

SUPPLIER

PHONE

WEBSITE

www.diodes.com

Diodes, Inc.

805-446-4800

888-522-5372

864-963-6300

770-436-1300

408-324-1790

602-244-6600

847-545-6700

800-348-2496

847-803-6100

847-297-0070

949-623-2900

402-563-6866

Fairchild Semiconductor

KEMET Corp.

www.fairchildsemi.com

www.kemet.com

Murata Electronics North America, Inc.

NEC TOKIN America, Inc.

ON Semiconductor

Sumida Corp.

www.murata-northamerica.com

www.nec-tokinamerica.com

www.onsemi.com

www.sumida.com

Taiyo Yuden

www.t-yuden.com

TDK Corp.

www.component.tdk.com

www.tokoam.com

TOKO America, Inc.

Toshiba America Electronic Components, Inc.

Vishay

www.toshiba.com/taec

www.vishay.com

Note: Indicate that you are using the MAX17122 when contacting these component suppliers.

7) Verify that the buck-boost regulator (VGOFF2) is

Quick Start

approximately -12V.

Recommended Equipment

U 10V to 14V, 5A DC power supply

8) Verify that the positive charge-pump linear-regulator

supply (VGON) is approximately +28V.

U Voltmeter

9) Verify that the negative charge-pump supply

(VGOFF1) is approximately -7.5V.

Procedure

The MAX17122 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.

Detailed Description of Hardware

Jumper Settings

Several jumper settings in the following tables illustrate

features of the MAX17122 EV kit.

1) Verify that shunts are not installed across jumpers

JU1, JU2, and JU3.

Enable Inputs (EN1, EN2)

The MAX17122’s enable inputs can be configured

through jumpers JU1 and JU2. JU1 controls the EN1

pin, which enables the step-down regulator and gates

the EN2 function as well. JU2 controls pin EN2, which

enables the step-up and positive charge-pump linear

regulator when EN1 is high. When EN1 is low, all power

outputs are disabled. When EN_ is high, the respective

outputs are enabled. When EN_ is low, the respective

outputs are disabled. See Table 1 for jumpers JU1 and

JU2 configurations.

2) Verify that a shunt is installed across jumper JU4.

3) Connect the positive terminal of the power supply

to the VIN pad. Connect the negative terminal of the

power supply to the PGND pads closest to VIN.

4) Set the power supply VIN to +12V.

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

switching regulator output (AVDD) is +15V.

6) Verify that the step-down switching regulator (3.3V) is

+3.3V.

Table 1. Jumpers JU1 and JU2 Functions (EN1, EN2)

SHUNT POSITION

EN1 PIN

EN2 PIN

OUTPUTS

JU1

Installed

JU2

Installed

Connected to GND

Internally pulled high

Connected to GND

Internally pulled high

Connected to GND

Internally pulled high

All disabled

Installed

Not installed

Installed

Not installed

Not installed*

*Default position.

Step-down enabled

All enabled

Not installed*

_______________________________________________________________________________________

MAX17122 Evaluation Kit

High-Voltage Stress Mode Input (JU3)

The MAX17122’s high-voltage stress (HVS) mode is

controlled through jumper JU3. When jumper JU3 is

installed, HVS is connected to VL and the RHVS output

is connected to AGND. When jumper JU3 is not installed,

the HVS pin is left unconnected and the RHVS output is

unconnected. See Table 2 for jumper JU3 configuration.

Step-Down Regulator Output-Voltage

Selection (+3.3V)

The EV kit’s step-down switching regulator supports both

fixed and adjustable output voltages. By default, the EV

kit’s step-down regulator’s output (3.3V) is set to the

+3.3V fixed mode by connecting FB2 to GND through

resistor R20. For adjustable mode (+1.5V to +3.6V),

select R21 and R20 to set the desired step-down regu-

lator output voltage. Refer to the Detailed Description,

Step-Down Regulator section in the MAX17122 IC data

sheet for instructions on selecting resistors R20 and R21.

Thermistor Network Connection (JU4)

The 100FA current from the SET pin, together with

resistor R23 at SET determines the cold-temperature

output voltage. The network at the NTC pin controls the

transition between the warm-temperature output volt-

age (determined by FB3 resistors R5 and R6) and the

cold-temperature output voltage. As configured, the

warm-temperature output voltage is -12V, slowly transi-

tioning at approximately +25NC to the cold-temperature

Buck-Boost Regulator Output-Voltage

Selection (VGOFF2)

The output voltage of the step-up regulator is tempera-

ture compensated. From the warm-temperature range

((3.3V - V

) > 1.65V), the output voltage is set by

NTC

output voltage level of -20V. Refer to the MAX17122 IC

data sheet for more information regarding temperature

compensation.

connecting a resistive voltage-divider from the output

(V ) to the +3.3V reference, with the center tap

connected to FB3. Select R6 in the 10kIto 50kIrange.

GOFF2

Jumper JU4 controls the thermistor network connected

to the NTC pin. When JU4 is installed, thermistor R8

is connected to NTC and the behavior of the GOFF2

output voltage varies with temperature. When JU4 is not

installed, NTC is connected to AGND through resistors

R7 and R9 and GOFF2 output voltage is fixed. See Table

3 for jumper JU4 configuration.

Calculate R5 with the following equation:

− V

FB3

− 3.3V

GOFF2_WARM

R5 = R6 ×

FB3

where V

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

FB3

is +1.65V. Place R5 and R6 close to the IC.

For cold temperatures ((3.3V - V ) < V

NTC

voltage is set by:

), output

SET

Step-Up Regulator Output-Voltage

Selection (AVDD)

The EV kit’s step-up switching-regulator output (AVDD)

is set to +15V by feedback resistors R1 and R2. To gen-

erate output voltages other than +15V, select different

external voltage-divider resistors (R1 and R2). Refer to

the Step-Up Regulator, Output Voltage Selection section

in the MAX17122 IC data sheet for more information.

R6× V

+ R5× 3.3V

GOFF2_COLD

SET

R5 + R6

If the calculated V

voltage is larger than +1.65V,

SET

then temperature compensation is disabled and the

buck-boost regulator output will be V

temperatures.

at all

GOFF2_WARM

Calculate the SET pin resister R

(R23) as follows:

SET

100µA

Table 2. Jumper JU3 Function (HVS)

Table 3. Jumper JU4 Function (NTC)

SHUNT

POSITION

SHUNT

POSITION

THERMISTOR

NETWORK

HVS PIN

RHVS OUTPUT

GOFF2 OUTPUT

Connected to

AGND

Varies over

temperature

Installed

Connected to VL

Installed*

Connected

Not installed

Not connected

Fixed output

Not

installed*

Internally pulled to

GND

Unconnected

*Default position.

______________________________________________________________________________________

MAX17122 Evaluation Kit

Negative Linear Regulator Output-Voltage

Selection (VGOFF1)

Positive Charge-Pump Output-Voltage

Selection (VGON)

The positive charge-pump output (VGON) is set to +28V

by voltage-divider resistors R11 and R12. To set VGON

to other voltages, adjust the charge-pump regulator’s

output voltage by connecting a resistive voltage-divider

from the VGON output to AGND, with the center tap con-

nected to FBP. Select the lower resistor of the divider

R12 in the range of 10kI to 30kI. Calculate the upper

resistor R11 with the following equation:

The negative linear-regulator output (VGOFF1) is set to

-7.5V by voltage-divider resistors R13 and R14. To set

VGOFF1 to other voltages, adjust the negative linear-

regulator output voltage (VGOFF1) by connecting a

resistive voltage-divider from VGOFF1 to +3.3V with the

center tap connected to FBN. Select R13 in the 20kI to

50kI range. Calculate R14 with the following equation:

− V

FBN

− 3.3V

GOFF1

R14 = R13×

FBN









GON

R11= R12 ×

−1





where V

= +1V. Refer to the Negative Linear

FBN

FBP

Regulator, Output-Voltage Selection section in the

MAX17122 IC data sheet for instructions on selecting

R13 and R14.

where V

= +1.25V (typ). Refer to the Positive Charge-

FBP

Pump Linear Regulator section in the MAX17122 IC data

sheet for instructions on selecting R11 and R12.

_______________________________________________________________________________________

MAX17122 Evaluation Kit

Figure 1. MAX17122 EV Kit Schematic

______________________________________________________________________________________

MAX17122 Evaluation Kit

1.0”

Figure 2. MAX17122 EV Kit Component Placement Guide—

Component Side

Figure 3. MAX17122 EV Kit PCB Layout—Component Side

1.0”

Figure 4. MAX17122 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.

MAX17122EVKIT [MAXIM]

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