19-1381; Rev 0; 7/98
MAX1678 Evaluation Kit
General Description
The MAX1678 evaluation kit (EV kit) provides a regulated
3.3V output while operating on input voltages as low as
0.7V with guaranteed start-up at 0.87V. The input source
can be a 1 or 2-cell battery or a DC supply. Efficiency is
typically 90% with output loads up to 100mA.
The kit uses surface-mount components and is fully
assembled and tested for quick evaluation. Jumpers
are provided for selecting an adjustable output voltage
and for shutdown control.
o
0.87V to V
OUT
Input Range
o
Synchronous Rectified鈥擭o External Diode
Required
o
3.3V Output Voltage (or Adjustable)
o
100mA Output
o
90% Efficiency
o
2碌A(chǔ) Shutdown Current
o
Small Surface-Mount Components
o
Inductor Damping Switch Suppresses EMI
Features
Evaluates: MAX1678
Component List
DESIGNATION QTY
C1, C2
2
DESCRIPTION
10碌F, 10V ceramic capacitor
Taiyo Yuden LMK325BJ106MN,
TDK C3225X5R1A106M
47碌H, 240mA power inductor
Coilcraft DS1608C-473
Sumida CD43-470
Murata LQH4N470K
3-pin jumper
2-pin jumper
1M鈩? 1% resistors
Open
100k鈩?, 5% resistor
MAX1678EUA
Shunts
MAX1678 EV kit PC board
MAX1678 data sheet
Ordering Information
PART
MAX1678EVKIT
TEMP. RANGE
0擄C to +70擄C
IC PACKAGE
8 碌MAX
L1
J1
J2
R1, R4
R2, R3
R5
U1
None
None
None
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1
1
2
2
1
1
2
1
1
_________________________Quick Start
The MAX1678 EV kit is shipped 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 the shunts are positioned on the jumpers
as listed in Table 2 for a 3.3V output.
2) Connect a +0.87V to +3.3V supply voltage to the
VIN pad. Connect ground to the GND pad.
Note:
once started, the input voltage may drop as low as
0.7V if the output current is less than 10mA.
3) Connect a voltmeter and the load (if any) to the
VOUT pad.
Component Suppliers
SUPPLIER
Coilcraft
Coiltronics
Murata
Sumida
Taiyo Yuden
TDK
PHONE
847-639-6400
561-241-7876
814-237-1431
847-956-0666
408-573-4150
847-390-4373
FAX
847-639-1469
561-241-9339
814-238-0490
847-956-0702
408-573-4159
847-390-4428
4) Turn on the power and verify that the output voltage
is +3.3V.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
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