MAX1938EVKIT+ [MAXIM]

a fully tested and assembled power supply;


型号：	MAX1938EVKIT+
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	a fully tested and assembled power supply
文件：	总9页 (文件大小：508K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-2961; Rev 1; 5/07

MAX1938 Evaluation Kit

General Description

Features

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The MAX1938 evaluation kit (EV kit) is a fully tested and

assembled power supply that demonstrates the full

functionality of the MAX1937/MAX1938/MAX1939 family

of synchronous, two-phase, step-down controllers. The

circuit operates from an input supply range of 8V to 14V

and provides VID-controlled CPU core voltage with up

to 60A of output current. The EV kit comes with the

MAX1938 installed, which provides a 5-bit VID code

interface to meet Intel Voltage-Regulator Module (VRM)

9.0/9.1 specifications. The MAX1937 and MAX1939 can

also be evaluated using the same board by replacing

the MAX1938. The MAX1937 supports the AMD

Hammer CPU VID codes, and the MAX1939 supports

the AMD Athlon^®Mobile CPU VID codes.

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Ordering Information

PꢂRT

TEMP%RꢂNGE

-40°C to +85°C

IC%PꢂCKꢂGE

28 QSOP

MꢂX1938EꢀKIT

MꢂX1938EꢀKIT+

28 QSOP

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Note: To evaluate the MAX1937 or MAX1939, request free sam-

ples along with the MAX1938 EV kit.

+Denotes lead-free and RoHS-compliant.

Component List

DESIGNꢂTI N QTY

DESCRIPTI N

DESIGNꢂTI N QTY

DESCRIPTI N

0.01µF, 50V X7R capacitor (0603)

Taiyo Yuden UMK107B103KZ or

equivalent

2.2µF, 10V X5R capacitors (0805)

Taiyo Yuden LMK212BJ225KG or

equivalent

C15

C1, C4

2.2µF, 16V X7R capacitor (1206)

Taiyo Yuden EMK316BJ225ML or

equivalent

C16

Not installed (0603)

330µF, 25V Al electrolytic capacitors

SANYO 25MV330WX

C18–C23

0.22µF, 10V X7R capacitors (0603)

Taiyo Yuden LMK107BJ224KA or

equivalent

560µF, 4V OSCON (E) capacitors

SANYO 4SP560M

C3, C7

C24–C31

10µF, 16V X5R capacitors (1210)

Taiyo Yuden TMK325BJ106MM or

equivalent

0.47µF, 10V X5R capacitor (0603)

Taiyo Yuden LMK107BJ474KA or

equivalent

C33, C34, C45,

C46

C35–C44,

C54–C57

47pF, 50V C0G capacitor (0603)

Murata GRM1885C1H470J or

equivalent

Open

C47–C53

1000pF, 50V X7R capacitors (0603)

Murata GRM188R71H102K or

equivalent

2200pF, 50V X7R (0805)

AVX 08055A222AT2A

C8, C9, C17,

C32

C58, C59

CON1–CON6

Banana jacks, noninsulated

1µF, 10V X7R capacitors (0805)

Taiyo Yuden LMK212BJ105MG or

equivalent

Diode (SOD123)

Central Semiconductor CMHD4448

LEAD FREE

C10–C14

Quick-PWM is a trademark of Maxim Integrated Products, Inc.

Dual Schottky diodes (SOT23)

Central Semiconductor CMPSH-3A

LEAD FREE

AMD Athlon is a registered trademark of Advanced Micro

Devices, Inc.

___________________________________________________________________________________________ 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.

MAX1938 Evaluation Kit

Component List (continued)

Component Suppliers

DESIGNꢂTI N QTY

DESCRIPTI N

Not installed (D-Pak)

SUPPLIER

PH NE

WEBSITE

D3, D4

BI Technologies 714-447-2345 www.bitechnologies.com

JU4–JU9

2-pin headers

Central

631-435-1110 www.centralsemi.com

Semiconductor

0.60µH inductors

L1, L2

Panasonic ETQP1H0R6BFA

BI HM7340R50 (alternate)

Fairchild

888-522-5372 www.fairchildsemi.com

Semiconductor

N1, N2, N3,

N6, N7, N8

n-channel MOSFETs (D-Pak)

IRF IRLR7811WPBF

n-channel MOSFETs (D²PAk)

Fairchild ISL9N303AS3ST_NL

International

310-322-3331 www.irf.com

Rectifier

N4, N5, N9,

N10

Kamaya, Inc.

260-489-1533 www.kamaya.com

770-436-1300 www.murata.com

Murata Mfg. Co.,

Ltd.

N11–N22

Not installed, 8-pin SO

10Ω 5ꢀ resistor (0603)

51.1kΩ 1ꢀ resistor (0603)

200kΩ 1ꢀ resistor (0603)

68.1kΩ 1ꢀ resistor (0603)

1.8Ω 5ꢀ resistors (0603)

100kΩ 5ꢀ resistor (0603)

120kΩ 5ꢀ resistor (0603)

200Ω 5ꢀ resistors (0603)

4.7Ω 5ꢀ (0603)

Panasonic Corp. 800-344-2112 www.panasonic.com

Sanyo Corp.

Taiyo Yuden

Vishay

619-661-6835 www.sanyo.com

800-348-2496 www.t-yuden.com

203-268-6261 www.vishay.com

R5, R8

Note: Indicate that you are using the MAX1938 when contacting

these component suppliers.

Procedure

Follow these steps to verify operation of the MAX1938 EV

kit. When making connections to the high-current input

and output, make sure that the wire gauge is heavy

enough to handle the necessary current and minimize

voltage drop in these wires. CꢁOuiVn:%DV%nVu%uOꢃn%Vn%uhg

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R9, R10

R13

R16, R19

R17, R18

R20

1.5Ω 5ꢀ (1206)

100Ω 5ꢀ resistors (0603)

Not installed (0603) PCB short

MAX1938EEI+ QSOP

1) Preset the power supply between 8V and 14V. Turn

off the power supply.

6V linear regulator (DPAK)

Fairchild KA78M06RTF

2) Select the desired output voltage using the VID_

jumpers (see Table 1 for a list of jumper settings

and corresponding output voltages).

None

Shunts

Part of Kit

MAX1938EVKIT PC board

3) Verify that the pins of jumper EN are not shorted.

Quick Start

Required Equipment

The following equipment is required before beginning:

4) Connect the positive (+) power-supply output to the

banana connector labeled IN on the MAX1938 EV kit.

5) Connect the negative (-) power-supply output to the

banana connector labeled GND located near the

center of the MAX1938 EV kit.

•

8V to 14V, at least 150W power supply or battery

Adjustable load capable of sinking 60A at 0.8V

Two digital multimeters (DMMs)

6) If available, connect the positive (+) power-supply

sense lead to the pad labeled IN, and connect the

negative (-) power-supply sense lead to the pad

labeled GND (next to IN).

Oscilloscope

NVug: Active electronic loads have a minimum input voltage

required when sinking current. Make sure that the load is capa-

ble of sinking the necessary current at the lowest voltage. Take

into account the voltage drop in the wires connecting the EV kit

to the load. To minimize the voltage drop in the wires, two con-

nectors are provided on the EV kit for the output allowing two

wires to be connected in parallel. It is also acceptable to use two

loads, each sinking half the current.

7) If the power supply does not have sense connec-

tions, use a DMM to monitor the input voltage on

the board. Connect the positive terminal of DMM 1

to the pad labeled IN, and connect the common

(COM) or ground terminal of the DMM to the pad

labeled GND (next to the IN pad).

______________________________________________________________________________________

MAX1938 Evaluation Kit

8) If using an active load, connect the positive side of the

load to the banana connectors labeled OUT (located

at the top of the EV kit board). Two OUT connections

are provided on the board so that two parallel wires

can be used to connect the load. Alternatively, two

loads can be connected in parallel, one to each OUT

connector. Connect the negative side of the load to

the banana connectors labeled GND (located near the

top of the board by the OUT connectors). Two GND

connections are provided for paralleling wires to the

load or connecting multiple loads.

are used, short the pins of the VID_ jumper with the pro-

vided shunts to set the VID_ bits to logic 0. Remove the

shunt from the jumper to set the corresponding bit to

logic 1. If the VID_ inputs are driven as digital inputs,

remove all the shunts from the VID_ jumpers.

The VID code can be changed either when the convert-

er is off or when it is functioning (on-the-fly). When the

VID code is changed on-the-fly, the output voltage

ramps up or down at a controlled rate until the new

voltage is reached (refer to the MAX1937/MAX1938/

MAX1939 data sheet for more details).

9) Use a DMM to monitor the output voltage. Connect the

positive (+) terminal of DMM 2 to the pad labeled OUT

(located in the upper-left corner of the EV kit board as

shown in Figure 3). Connect the common (COM) or

ground terminal of the DMM to the GND pad (located

next to the OUT pad in the upper left corner).

Enable Input (EN)

The enable input can be used to enable or shut down

the controller. This can be done either by using the EN

jumper provided on the EV kit, or by driving the EN

input as a digital input. When using the jumper, short

the pins of the EN jumper to shut down or remove the

short to enable the output (see Table 2). When using

EN as a digital input, remove the shunt from the EN

jumper. Drive EN high to enable the output or drive EN

low for shutdown.

10) If desired, connect an oscilloscope probe to the

connector located between the OUT and GND

banana connectors. The oscilloscope can then be

used to observe the output ripple.

11) Turn on the power supply.

Power-Good Output (PWRGD)

Power-good (PWRGD) is an open-drain output with a

100kΩ external pullup resistor to VDD. This output is

low if the output voltage deviates more than 12.5ꢀ from

the value set by the VID code, and high when the out-

put is in regulation. PWRGD is low when the part is in

shutdown or during startup.

12) Using DMM 2, verify that the output voltage match-

es the voltage selected with the VID_ inputs.

13) Set the active load to the desired current (up to

60A), or connect a passive load to the output.

14) Verify that the correct output voltage appears on

DMM 2.

Customizing the

MAX1938 EVKIT

15) To verify operation of the enable/shutdown feature,

connect the pins of jumper EN using the shunt pro-

vided. The MAX1938 shuts down and the output

voltage drops to zero.

Evaluating the MAX1937 or MAX1939

The MAX1938 EV kit comes with the MAX1938 installed,

providing a VID code interface to meet Intel VRM 9.0/VRM

9.1 specifications. The MAX1937 and MAX1939 can also

be evaluated using the same board by replacing the

MAX1938. The MAX1937 supports the AMD Hammer

CPU VID codes, whereas the MAX1939 supports the AMD

Athlon Mobile CPU VID codes.

16) Remove the shunt across jumper EN. The MAX1938

powers up and the output voltage returns to its

nominal value.

17) To use the on-the-fly VID code feature, change the

VID_ jumper settings (see Table 1). The output

voltage changes to the newly selected value at a

controlled rate without overshoot or undershoot.

To evaluate the MAX1937 or MAX1939, carefully

remove the MAX1938 from the EV kit and replace it with

the new part. Free samples of the MAX1937 and

MAX1939 can be obtained from Maxim. The EV kit can

be preconfigured with the MAX1937 or MAX1939 upon

request.

Detailed Description

Setting the Output Voltage (VID_)

The MAX1938 EV kit uses a 5-bit VID interface for select-

ing the output voltage. Table 1 shows the output voltages

corresponding to each VID code. Either each VID_ input

can be driven as a digital input, or the code can be set

using the jumpers provided on the board. If the jumpers

_______________________________________________________________________________________

MAX1938 Evaluation Kit

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ꢀID4

ꢀID3

ꢀID2

ꢀID1

ꢀID±

MꢂX193.

1.550

1.525

1.500

1.475

1.450

1.425

1.400

1.375

1.350

1.325

1.300

1.275

1.250

1.225

1.200

1.175

1.150

1.125

1.100

1.075

1.050

1.025

1.000

0.975

0.950

0.925

0.900

0.875

0.850

0.825

0.800

Shutdown

MꢂX1938

1.850

1.825

1.800

1.775

1.750

1.725

1.700

1.675

1.650

1.625

1.600

1.575

1.550

1.525

1.500

1.475

1.450

1.425

1.400

1.375

1.350

1.325

1.300

1.275

1.250

1.225

1.200

1.175

1.150

1.125

1.100

Shutdown

MꢂX1939

2.000

1.950

1.900

1.850

1.800

1.750

1.700

1.650

1.600

1.550

1.500

1.450

1.400

1.350

1.300

Shutdown

1.275

1.250

1.225

1.200

1.175

1.150

1.125

1.100

1.075

1.050

1.025

1.000

0.975

0.950

0.925

Shutdown

Note: In the above table, a zero indicates VID_ is driven low or the jumper pin is connected. A 1 indicates VID_ is driven high or the

jumper is not connected.

Tꢁbog%20%EN%JOmtgꢃ%FOnAuiVns

EN%JUMPER

FUNCTI N

OPEN

Enable the output

Shut down the output

SHORT

______________________________________________________________________________________

MAX1938 Evaluation Kit

Figure 1a. MAX1938 EV Kit Schematic (Sheet 1 of 2)

_______________________________________________________________________________________

MAX1938 Evaluation Kit

Figure 1b. MAX1938 EV Kit Schematic (Sheet 2 of 2)

______________________________________________________________________________________

MAX1938 Evaluation Kit

Figure 3. MAX1938 EV Kit PCB Layout—Component Side

Figure 2. MAX1938 EV Kit Component Placement Guide—

Component Side

_______________________________________________________________________________________

MAX1938 Evaluation Kit

Figure 4. MAX1938 EV Kit PCB Layout—Inner Layer 2

Figure 5. MAX1938 EV Kit PCB Layout—Inner Layer 3

______________________________________________________________________________________

MAX1938 Evaluation Kit

Figure 6. MAX1938 EV Kit PCB Layout—Solder Side

Revision History

Pages changed at Rev 1: 1, 2, 5, 9

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 _____________________________ 9

is a registered trademark of Maxim Integrated Products, Inc.

MAX1938EVKIT+ [MAXIM]

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