MAX1945EVKIT データシートの表示（PDF） - Maxim Integrated

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MAX1945EVKIT

MAX1945 Evaluation Kit

Maxim Integrated 

MAX1945 Evaluation Kit

Component List (continued)

DESIGNATION QTY

DESCRIPTION

JU4

1 3-pin header

L1

1 1.2µH, 9A inductor

Sumida CDRH8D43 4783-T010

R1

1 0Ω ±5% resistor (0603)

R2

0 Not installed, resistor (0603)

R3

R4

R5, R6, R7

1 180kΩ ±5% resistor (0603)

1 10Ω ±5% resistor (0805)

3 100kΩ ±5% resistors (0603)

U1

None

1 MAX1945REUI, 28-pin TSSOP-EP

4 Shunts (JU1–JU4)

None

1 MAX1945 PC board

5) Connect the 2.6VDC to 5.5VDC power supply to the

VIN pad. Connect the supply ground to the PGND

pad.

6) Turn on the power supply and verify that the output

voltage at VOUT is 1.8V.

For instructions on selecting the feedback resistors for

other output voltages, see the Evaluating Other Output

Voltages section.

Detailed Description

The MAX1945 EV kit contains a step-down switching-

regulator circuit providing 1.8V and up to 6A at the

output. The circuit can be powered from a DC power

supply with an input range of 2.6V to 5.5V and supply

up to 5A of current.

The circuit utilizes a MAX1945R regulator IC with ±4%

voltage margining and is configured for a 1.8V output.

The output voltage is set to 1.8V by JU4 (FBSEL), exter-

nal divider resistor R1, and the MAX1945R internal

resistor-dividers. The output can be reconfigured for

other output voltages. The voltage margining and shut-

down features are controlled by two multifeature

jumpers (JU1, JU2). The output voltage can be config-

ured to operate at 1.8V (nominal), 1.87V (+4%), or

1.73V (-4%).

The MAX1945R IC in a TSSOP-EP package features an

internal power MOSFET switch and an internal synchro-

nous rectifier. The EV kit’s four-layer PC board has cop-

per pads under the IC and vias connecting to the

PGND layer (layer 2) to dissipate heat away from the

IC. This enables the EV kit to operate at high current

ratings.

The MAX1945 EV kit is configured to switch at 500kHz.

The EV kit can be reconfigured to switch at 1MHz or

use an external TTL/CMOS digital clock source. PC

board pads are provided for the MAX1945 IC’s SYNC

input and SYNCOUT signals. A second MAX1945 EV

kit’s SYNC input can be fed from the SYNCOUT signal.

This enables the second MAX1945 to switch 180

degrees out-of-phase relative to the first MAX1945R IC.

An oscilloscope jack (J1) can be installed on the EV kit

to obtain accurate voltage transient response and

output ripple measurement. Obtain the jack from the

manufacturer listed in the Component List for

Designation J1.

Jumper Selection

Shutdown Mode/Voltage Margining Control

The MAX1945 EV kit has two jumpers providing multi-

feature configurations. JU1 and JU2 configure the shut-

down mode that reduces the MAX1945 quiescent

current and voltage-margining modes. The voltage-

margining modes allow the output to be shifted to a

higher or lower supply tolerance. Table 1 lists the selec-

table jumper options for the shutdown and voltage-mar-

gining modes.

Synchronization and Frequency Selection

The MAX1945 EV kit provides a jumper to select the

switching frequency of the MAX1945R IC. Additionally,

the MAX1945R can be synchronized to an external

Component Suppliers

SUPPLIER

AVX

Central Semiconductor

Panasonic

PHONE

843-946-0238

631-435-1110

714-373-7366

FAX

843-626-3123

631-435-1824

714-737-7323

WEBSITE

www.avxcorp.com

www.centralsemi.com

www.panasonic.com

Sumida USA

TDK

847-545-6700

847-803-6100

847-545-6720

847-390-4405

www.sumida.com

www.component.tdk.com

Note: Please indicate that you are using the MAX1945 when contacting these component suppliers.

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