19-2076; Rev 0; 7/01
MAX1724 Evaluation Kit
General Description
The MAX1724 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that contains
two separate boost switching-regulator circuits. The
left-side circuit contains a MAX1724 with a preset 3.3V
output. Other preset voltages of 2.7V, 3.0V, or 5.0V are
also available. The right-side circuit contains a
MAX1722, which has an adjustable output voltage. This
circuit鈥檚 output is set for 3.6V. All devices regulate with
input voltages from 0.91V to V
OUT
, making them ideal
for 1- or 2-cell alkaline and NiMH battery applications.
The right-side circuit may also be used to evaluate the
MAX1723, which features a shutdown (SHDN) mode.
The MAX1722/MAX1724 has a BATT pin, which lowers
the guaranteed startup voltage from 1.2V to 0.91V.
The MAX1722/MAX1723/MAX1724 feature synchronous
rectification and ultra-low (1.5碌A(chǔ) typ) quiescent current
for maximum efficiency and long battery life. Operation
up to 200kHz allows tiny surface-mount components.
o
0.91V to V
OUT
Input Voltage Range
o
Two Complete Boost Circuits
3.3V Fixed (MAX1724)
3.6V Adjustable Output (MAX1722)
o
Up to 50mA Output from a 1-Cell Input
Up to 100mA Output from a 2-Cell Input
o
1.5碌A(chǔ) Quiescent Current from V
OUT
o
Up to 90% Efficiency with Synchronous
Rectification
o
Switching Frequency Up to 200kHz
o
All Surface-Mount Design
o
Fully Assembled and Tested Board
Features
Evaluates: MAX1722/MAX1723/MAX1724
Ordering Information
PART
MAX1724EVKIT
TEMP. RANGE
0擄C to +70擄C
IC PACKAGE
THIN SOT23-5
Component List
DESIGNATION QTY
C1鈥揅4
D1
L1, L2
R1
R2
U1
U2
JU1, JU2
None
None
None
None
4
0
2
1
1
1
1
2
2
1
1
1
DESCRIPTION
10碌F, 10V X7R ceramic capacitors
Taiyo Yuden JMK325BJ106MN
Not installed
10碌H inductors
Sumida CDR43-100MC
2M鈩?鹵1% resistor (0805)
Venkel CR0805-10W-2004FT
1.02M鈩?鹵1% resistor (0805)
Venkel CR0805-10W-1024FT
Maxim MAX1724EZK33
(5-pin THIN SOT23, top mark ADQJ)
Maxim MAX1722EZK (5-pin THIN
SOT23, top mark ADQF)
3-pin headers
Shunts JU1, JU2
MAX1724 PC board
MAX1722/MAX1723/MAX1724 data
sheet
MAX1724 EV kit data sheet
SUPPLIER
Murata
Sumida
Taiyo
Yuden
Venkel
Component Suppliers
PHONE
FAX
WEB
www.murata.com
www.sumida.com
814-237-1431 814-238-0490
847-956-0666 847-956-0702
408-573-4150 408-573-4159 www.T-yuden.com
512-794-0081 512-794-0087
www.venkel.com
Note:
Please indicate that you are using the MAX1724 when
contacting these component suppliers.
Quick Start
The MAX1724 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.
3.3V Output (left side):
1) Connect a 0.91V to 3.3V supply to the VBATT pad.
Connect the supply ground to the GND pad.
2) Connect a voltmeter to the VOUT pad.
3) Verify there is a shunt across pins 1 and 2 of
jumper JU1 (SHDN), thus enabling the MAX1724.
4) Turn on the power supply and verify that the output
is at 3.3V.
Note:
Quantities are for both circuits.
________________________________________________________________
Maxim Integrated Products
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
Maxim
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