1680.PDF

19-1211; Rev 0; 3/97

MAX1630/MAX1631/MAX1632 Evaluation Kits

_______________General Description

The MAX1630/MAX1631/MAX1632 evaluation kits (EV

kits) each consist of one of three preassembled and

tested evaluation boards (EV boards) that embody the

standard application circuits. The MAX1630 and

MAX1632 EV boards provide the triple-output 3.3V/5V/

12V circuit, and the MAX1631 EV board provides the

dual-output 3.3V/5V circuit.

All three use the same PC board but have different

components to accommodate different input voltage

ranges. The main differences between the MAX1630

and MAX1632 EV boards are in the turns ratio (1:4 or

1:2.2) and in the location of the transformer connection

(3.3V side or 5V side). Connecting the transformer to

the 3.3V side allows lower input voltage. Connecting

the transformer to the 5V side provides slightly better

efficiency and lower stress voltages.

These circuits are configured to deliver up to 3A of out-

put current on each of the main PWM outputs with

greater than 90% efficiency. The MAX1630/MAX1631/

MAX1632 EV kits can also be used to evaluate other

output voltages.

____________________________Features

Battery Range: 5.2V to 20V (MAX1630)

5.2V to 28V (MAX1631)

6.5V to 28V (MAX1632)

Outputs: 3.3V at 3A

12V at 120mA

5V at 3A

5V at 30mA Keep-Alive

1:4 Transformer (MAX1630)

1:2.2 Transformer (MAX1632)

Adjustable 2.5V to 5.5V Outputs (optional resistor

divider)

Precision 2.5V Reference Output

Low-Noise Mode Control Input ( SKIP )

Fully Assembled and Tested

______________Ordering Information

PART

MAX1630 EVKIT-SO

MAX1631 EVKIT-SO

MAX1632 EVKIT-SO

TEMP. RANGE

BOARD TYPE

Surface Mount

0°C to +70°C

________________________________Components Common to All Three EV Kits

DESIGNATION

QTY

DESCRIPTION

DESIGNATION

QTY

DESCRIPTION

C1, C7, C21,

C22, C25

100mA, 30V dual Schottky diode

Central Semiconductor CMPSH-3A

0.1µF ceramic capacitors

200mA, 75V dual diode

Central Semiconductor CMPD2838

220µF, 10V, low-ESR tantalum caps

Sprague 594D227X0010D2T or

595D227X0010R2T

C2, C3, C12,

C13, C20

N-channel MOSFETs

International Rectifier IRF7413 or

Siliconix Si4410DY

C5, C6, C15,

C16

10µF, 30V electrolytic capacitors

Sanyo OS-CON 30SC10M

N1–N4

4.7µF, 25V ceramic capacitor

United Chemicon/Marcon

THCR40E1E475Z

R1–R4

, 5% resistors

0.020 ½ , 1% resistors

Dale WSL-2010-R020-F or

IRC LR2010-01-R020-F

R5, R8

4.7µF, 16V tantalum capacitors

Sprague 595D475X0016A2B

C9, C14

R6, R7,

R10–R13,

R15–R18

Open

C10, C18, C23

0.01µF ceramic capacitors

C17

0.22µF ceramic capacitor

, 5% resistor

C19

Open

R14

100k

, 5% resistor

4.7µF, 35V tantalum capacitor

Sprague 595D475X0035C2B or

5950475X0035B2B

R19

, 5% resistor

C24

SW1

DIP-8 dip switch

1A, 40V Schottky diodes

Nihon EC10QS04 or

Motorola MBRS140T3

MAX1630/MAX1631/MAX1632 PC

board

D1, D5, D7,

None

________________________________________________________________ Maxim Integrated Products

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

MAX1630/MAX1631/MAX1632 Evaluation Kits

MAX1630 EV Kit

____________Additional Components

MAX1631 EV Kit

____________Additional Components

DESIGNATION

QTY

DESCRIPTION

DESIGNATION

QTY

DESCRIPTION

2.2µF, 25V tantalum capacitor

Sprague 595D225X0025B2B

C4, C11

Open

D2, D4

Open

C11

Open

JU1, JU3–JU6

2-pin headers

1A, 100V, fast-recovery diode

Nihon EC11FS1 or

Motorola MBRS1100T3

JU5

Shunt

JU10, JU11

Short

10µH power inductors

Sumida CDRH125-100 (shielded) or

Coiltronics UP2-100 or

Coilcraft DO3316P-103

Open

L1, L2

JU1, JU3–JU6,

JU8, JU10,

JU11

2-pin headers

MAX1631 (SSOP-28)

Maxim MAX1631CAI

JU5

Shunt

10µH power inductor

Sumida CDRH125-100 (shielded) or

Coiltronics UP2-100 or

Coilcraft DO3316P-103

______________Component Suppliers

10µH, 1:4 transformer

Transpower Technologies TTI-5902

SUPPLIER*

PHONE

FAX

AVX

(803) 946-0690

(803) 626-3123

MAX1630 (SSOP-28)

Maxim MAX1630CAI

Central

Semiconductor

(516) 435-1110

(516) 435-1824

Coilcraft

(847) 639-6400

(847) 639-1469

Coiltronics

(561) 241-7876

(561) 241-9339

MAX1632 EV Kit

____________Additional Components

Dale-Vishay

(402) 564-3131

(402) 563-6418

International

Rectifier

(310) 322-3331

(310) 322-3332

DESIGNATION

QTY

DESCRIPTION

IRC

(512) 992-7900

(512) 992-3377

Open

2.2µF, 25V tantalum capacitor

Sprague 595D225X0025B2B

Motorola

(602) 303-5454

(602) 994-6430

C11

Nihon

(805) 867-2555

(805) 867-2698

1A, 100V, fast-recovery diode

Nihon EC11FS1 or

Motorola MBRS1100T3

Sanyo

(619) 661-6835

(619) 661-1055

Siliconix

(408) 988-8000

(408) 970-3950

Sprague

(603) 224-1961

(603) 224-1430

10µH power inductor

Sumida CDRH125-100 (shielded) or

Coiltronics UP2-100 or

Coilcraft DO3316P-103

Sprague/Sanyo

(207) 324-4140

(207) 324-7223

Sumida

(847) 956-0666

(847) 956-0702

Vishay/Vitramon

(203) 268-6261

(203) 452-5670

10µH, 1:2.2 transformer

Transpower Technologies TTI-5870

Transpower

Technologies

(702) 831-0140

(702) 831-3521

JU1, JU3–JU6,

JU8, JU10,

JU11

2-pin headers

* Note: Please indicate that you are using the MAX1630/

MAX1631/MAX1632 when contacting these component

suppliers.

JU5

Shunt

MAX1632 (SSOP-28)

Maxim MAX1632CAI

_______________________________________________________________________________________

MAX1630/MAX1631/MAX1632 Evaluation Kits

_________________________Quick Start

The MAX1630/MAX1631/MAX1632 EV kits are fully

assembled and tested. Follow these steps to verify

board operation. Do not turn on the power supply

until all connections are completed.

Jumper Selection

The three 2-pin headers JU3, JU4, and JU5 select the

power-up sequence mode. Table 1 lists the selectable

jumper options.

The 2-pin header JU6 selects the operating frequency.

Table 2 lists the selectable jumper options. The EV kit’s

components are selected for 300kHz operation.

Component values might need to be changed if

200kHz operation is selected (refer to the Design

Procedure section in the MAX1630–MAX1635 data

sheet). Synchronize the oscillator to an external clock

signal by driving the SYNC pad with a pulse train of 5V

amplitude in the 240kHz to 350kHz frequency range.

Connect a bench power supply (50W or better) to

the VIN and GND pads at the edge of the board.

Connect voltmeters and loads (if any) to the VOUT

pads.

Verify that switch SW1 positions SHDN, ON5, and

ON3 are on, and that the shunt is across JU5.

Turn on the power supply and verify that the output

voltages are 3.3V and 5V.

Table 1. Jumper JU3, JU4, JU5 Functions

SHUNT

LOCATION

_______________Detailed Description

POWER-UP

SEQUENCE

SEQ PIN

Output Voltage

The main output voltages come preset to 3.3V and 5V.

Install resistors R6/R7 and R12/R13 for adjustable

mode. Two small PC trace jumpers, JU9 and JU7,

shunt FB3 and FB5 to GND on the board. These

default jumpers must be cut for adjustable-mode

operation. Refer to the MAX1630–MAX1635 data sheet

for instructions on calculating R6/R7 and R12/R13. Do

not operate the circuit without a jumper or resistor-

divider installed, or output overvoltage will damage the

IC.

In addition to the standard components, the extra pull-

up and pull-down resistors listed below are used to set

logic input levels. These resistors can usually be omit-

ted in the final design.

R6, R7 Adjustable-mode resistor-divider (not in-

stalled). V OUT = 2.5V (1 + R6 / R7).

R12, R13 Adjustable-mode resistor-divider (not in-

stalled). V OUT = 2.5V (1 + R12 / R13).

JU3

Connected to GND

5V before 3.3V

JU4

Connected to VL

3.3V before 5V

Separate ON3/ON5

controls

JU5

Connected to REF

Table 2. Jumper JU6 Functions

SHUNT JU6

LOCATION

FREQUENCY

(kHz)

SYNC PIN

Connected to GND

200

Off

Connected to VL

300

Additional Jumpers (MAX1631 Only)

Additional jumpers on the board along with R10 and

R11 are for configuring the MAX1631 for an auxiliary

secondary output. R10 and R11 set the secondary

feedback voltage (refer to the MAX1630–MAX1635

data sheet). Table 3 lists the MAX1631 jumper settings.

R1–R4

logic pull-down resistors. Shorted out

or driven by logic.

R14

100k

SYNC pull-up resistor (usually shorted

out). SYNC to VL.

Table 3. MAX1631 Jumper Settings

JUMPER

FUNCTION

JU1

Connects the secondary feedback to R10 and R11.

Used in MAX1630 and MAX1632 for normal

connections.

JU2

JU8

Steers secondary feedback to the 3.3V SMPS.

JU10

Steers secondary feedback to the 5V SMPS.

JU11

Disables secondary feedback.

_______________________________________________________________________________________

MAX1630/MAX1631/MAX1632 Evaluation Kits

VIN

10 m F

30V

10 m F

30V

R19

C18

0.01

C21

0.1

C24

4.7

C17

0.22

35V

CMPD2838

V+

V DD

BST3

OPEN

+5V

OPEN

DH3

R16

0 .02 W

0.1

T 1 / L1

+3.3V

MAX

LX3

C20

220

R15

10V

220

10V

220

10V

DL3

OPEN

VIN

FB3

CSH3

CSL3

OPEN

JU9

CUT HERE

SW1A

SW1B

SW1C

S W1D

FB3

SKIP

SHDN

TIME/ON5

RUN/ON3

ON3

GND

C10

0.01

ON5

MAX1630

L2 = CDRH125-100

T1 = TTI-5902

D4, C11 = OPEN

MAX1631

L1 = CDRH125-100

L2 = CDRH125-100

D2, C4 = OPEN

D4, C11 = OPEN

MAX1632

L1 = CDRH125-100

T2 = TTI-5870

D2, C4 = OPEN

Figure 1. MAX1630/MAX1631/MAX1632 EV Kit Schematic

_______________________________________________________________________________________

MAX1630/MAX1631/MAX1632 Evaluation Kits

C15

C16

C22

0.1

30V

C23

0.01

C25

0.1

4.7

J U8

JU 1 0

JU11

+12V

12OUT

JU2

CUT H ERE

4.7

VDD

16V

BST5

R18

VDD

RAW +15V

DH5

0.1

T2/ L2

C11

2.2 m F

2 5V

JU1

LX5

R10

R11

R17

DL5

OPEN

0.020

PGND

CSH5

CSL5

+5V

C12

220

C13

220

C19

OPEN

FB5

R12

OPEN

1 0V

10V

JU3

SEQ

JU4

REF

JU5

SYNC

R13

OPEN

JU7

CUT HERE

RESET

+2.5V

C14

4.7

16V

R14

100k

SYNC

RESET

J U6

_______________________________________________________________________________________

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