MAX1945 Maxim Integrated Products, MAX1945 Datasheet
MAX1945
Manufacturer Part Number
MAX1945
Description
Evaluation Kit
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1945.pdf
(6 pages)
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The MAX1945 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that contains a
high-efficiency step-down switching-regulator circuit for
applications requiring on-board postregulation. The cir-
cuit utilizes a MAX1945R regulator featuring ±4% voltage
margining and is configured for a 1.8V output voltage.
The circuit provides up to 6A of current. A 2.6V to 5.5V
DC source can be utilized to power the circuit’s input.
The MAX1945R IC features an internal power MOSFET
switch and an internal synchronous rectifier. The
MAX1945 EV kit provides connections for the SYNC
input. It also provides an output to synchronize another
MAX1945 EV kit clock 180 degrees out-of-phase. Pulse-
width modulated (PWM) operation at 500kHz allows the
use of tiny surface-mount components.
19-2615; Rev 1; 1/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
DESIGNATION QTY
JU1, JU2, JU3
C3, C6, C7
C1
C2
C4
C5
C8
D1
J1
1
1
3
1
1
1
1
0
3
________________________________________________________________ Maxim Integrated Products
100µF ±20%, 8V polymer capacitor
(7.3 x 4.3)
Panasonic EEFUE0K101R
180µF ±20%, 4V polymer capacitor
(7.3 x 4.3)
Panasonic EEFUE0G181R
0.1µF ±10%, 10V X7R ceramic
capacitors (0603)
AVX 0603ZC104KAT
0.22µF ±10%, 6.3V X7R ceramic
capacitor (0603)
AVX 06036C224KAT
100pF ±5%, 50V COG ceramic
capacitor (0603)
TDK C1608COG1H101JT
1µF ±10%, 16V X7R ceramic
capacitor (1206)
TDK C3216X7R1C105KT
100m A, 30V S chottky d i od e ( S OD - 523)
Central Semiconductor CMOSH-3
Scope probe connector (not installed)
FCI 33JR135-1
2-pin headers
General Description
Component List
DESCRIPTION
MAX1945 Evaluation Kit
♦ 0.970in x 0.840in Circuit Footprint
♦ 2.6V to 5.5V Input Range
♦ Output Voltage
♦ Provides Up to 6A Output Current
♦ ±4% Voltage Margining
♦ Internal Power Switch and Synchronous Rectifier
♦ 500kHz/1MHz PWM Selectable Switching
♦ SYNC Input: Synchronizes from 400kHz to 1.2MHz
♦ SYNC Output: Drives 2nd MAX1945 Switching 180
♦ All Surface-Mount Components
♦ Fully Assembled and Tested
The following equipment is required before beginning:
• One 2.6V to 5.5V power supply capable of providing 5A
• One voltmeter
The MAX1945 EV kit is fully assembled and tested.
Follow these steps to verify board operation. Do not
turn on the power supply until all connections are
completed:
1) Verify that jumpers JU1 (CTL1) and JU2 (CTL2) do
2) Verify that a shunt is across the pins of jumper JU3
3) Verify that jumper JU4 (FBSEL, 1.8V) has a shunt
4) Connect the voltmeter to the VOUT and PGND
*EP = Exposed pad.
MAX1945EVKIT
Frequency
TTL/CMOS Clock
Degrees Out-of-Phase
not have shunts across their respective pins.
(SYNC).
installed across pins 2 and 3.
pads.
1.8V/2.5V Preset
0.8V to 0.85x VIN Adjustable
PART
1.8V Output Voltage (Nominal)
Ordering Information
TEMP RANGE
0°C to +70°C
Required Equipment
Quick Start
IC PACKAGE
28 TSSOP-EP*
Features
1
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