MAX1945 Maxim Integrated Products, MAX1945 Datasheet - Page 2

• Manufacturer Part Number: MAX1945
• Description: Evaluation Kit
• Manufacturer: Maxim Integrated Products

5) Connect the 2.6VDC to 5.5VDC power supply to the
6) Turn on the power supply and verify that the output
For instructions on selecting the feedback resistors for
other output voltages, see the Evaluating Other Output
Voltages section.
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-
MAX1945 Evaluation Kit
Note: Please indicate that you are using the MAX1945 when contacting these component suppliers.
2
AVX
Central Semiconductor
Panasonic
Sumida USA
TDK
DESIGNATION QTY
R5, R6, R7
VIN pad. Connect the supply ground to the PGND
pad.
voltage at VOUT is 1.8V.
_______________________________________________________________________________________
None
None
JU4
R1
R2
R3
R4
U1
L1
SUPPLIER
Component List (continued)
1
1
1
0
1
1
3
1
4
1
Detailed Description
3-pin header
1.2µH, 9A inductor
Sumida CDRH8D43 4783-T010
0Ω ±5% resistor (0603)
Not installed, resistor (0603)
180kΩ ±5% resistor (0603)
10Ω ±5% resistor (0805)
100kΩ ±5% resistors (0603)
MAX1945REUI, 28-pin TSSOP-EP
Shunts (JU1–JU4)
MAX1945 PC board
DESCRIPTION
843-946-0238
631-435-1110
714-373-7366
847-545-6700
847-803-6100
PHONE
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.
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.
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
843-626-3123
631-435-1824
714-737-7323
847-545-6720
847-390-4405
Shutdown Mode/Voltage Margining Control
FAX
Synchronization and Frequency Selection
Component Suppliers
www.avxcorp.com
www.centralsemi.com
www.panasonic.com
www.sumida.com
www.component.tdk.com
Jumper Selection
WEBSITE