19-1400; Rev 0; 11/98
MAX1692 Evaluation Kit
General Description
The MAX1692 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that contains a
pulse-width-modulated (PWM), step-down DC-DC con-
verter. The EV kit provides a +2.5V output voltage from
a +2.7V to +5.5V input source. It delivers up to 600mA
output current. The MAX1692 features internal MOSFET
switches, low dropout voltage, and a 1.2%-accurate
1.25V reference.
The MAX1692 EV kit provides low quiescent current
and high efficiency (up to 95%) for maximum battery
life. Operation at 750kHz allows the use of a tiny sur-
face-mount inductor.
o
+2.7V to +5.5V Input Voltage Range
o
+2.5V Output Voltage or
Adjustable Output from 1.25V to V
IN
o
600mA Output Current
o
100% Duty Cycle in Dropout
o
750kHz Fixed-Frequency PWM Operation
o
Internal MOSFET Switch and Synchronous
Rectifier
o
0.1碌A(chǔ) IC Shutdown Current
o
Surface-Mount Components
o
Fully Assembled and Tested
Features
Evaluates: MAX1692
Component List
DESIGNATION QTY
C1
1
DESCRIPTION
10碌F, 6.3V, X5R ceramic capacitor
Taiyo Yuden JMK325BJ106MN
47碌F, 6.3V, low ESR, electrolytic
capacitor, Sanyo 6TPA47M or
47碌F, 16V tantalum capacitor
Sprague 594D476X0016C2T
0.1碌F ceramic capacitor
0.22碌F ceramic capacitor
47pF ceramic capacitor
10碌H inductor
Sumida CDR63B-100 (shielded) or
CD43-100 (unshielded)
309k鈩? 1% resistor
301k鈩? 1% resistor
100k鈩? 5% resistor
MAX1692EUB
3-pin header
Shunt (JU1)
2-pin header
MAX1692 PC Board
MAX1692 data sheet
Ordering Information
PART
MAX1692EVKIT
TEMP. RANGE
0擄C to +70擄C
IC-PACKAGE
10
碌MAX
C2
1
C3
C4
C5
L1
R1
R2
R3
U1
JU1
None
JU2
None
None
1
1
1
1
1
1
1
1
1
1
1
1
1
Quick Start
The MAX1692 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) Connect a +2.7V to +5.5V supply to the V
IN
pad.
Connect the ground to the GND pad.
2) Connect a voltmeter to the V
OUT
pad.
3) Verify that the shunt is across JU1 pins 1 and 2.
4) Turn on the power supply and verify that the output
is at +2.5V.
Detailed Description
Jumper Selection
Shutdown Mode
The MAX1692 EV kit features a shutdown mode that
reduces the MAX1692 IC鈥檚 quiescent current to 0.1碌A(chǔ),
preserving battery life. The 3-pin header, JU1, selects
the shutdown mode (Table 1).
Component Suppliers
SUPPLIER
Dale-Vishay
Sanyo
Sprague
Sumida
Taiyo Yuden
PHONE
402-564-3131
619-661-6835
603-224-1961
708-956-0666
408-573-4150
FAX
402-563-6418
619-661-1055
603-224-1430
708-956-0702
408-573-4159
Table 1. Jumper JU1 Functions
SHUNT
LOCATION
1&2
2&3
SHDN
PIN
Connected to VIN
MAX1692 OUTPUT
MAX1692 enabled,
V
OUT
= 2.5
Note:
Please indicate that you are using the MAX1692 when
contacting these component suppliers.
Connected to GND Shutdown mode, V
OUT
= 0
1
________________________________________________________________
Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
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