19-2469; Rev 0; 5/02
MAX1972 Evaluation Kit
General Description
The MAX1972 evaluation kit (EV kit) is a fully assembled
and tested circuit board that evaluates the MAX1970
family of dual step-down regulators. The circuit oper-
ates from an input voltage of 2.6V to 5.5V, and delivers
a minimum of 750mA on each output. The output volt-
ages are programmable from 0.8V to V
IN
using external
feedback resistors, or they can be preset to 3.3V or
1.8V for output 1, and 2.5V or 1.5V for output 2. The
board has a MAX1972 installed, but it can also be used
to evaluate the MAX1970 and the MAX1971. The
MAX1971 features a reset input (RSI), while the
MAX1970/MAX1972 feature a power-fail output (PFO).
Features
o
Current-Mode, 1.4MHz Fixed-Frequency PWM
Operation
o
Dual-Output 180擄 Out-of-Phase Operation
Reduces Input Ripple Current
o
鹵1% Output Accuracy Over Load, Line, and
Temperature Ranges
o
750mA Guaranteed Output Current
o
2.6V to 5.5V Input
o
Power-On Reset Output (POR)
o
Power-Fail Output (MAX1970 and MAX1972)
o
Power-On Reset Input (MAX1971)
o
Ultra-Compact Design with Small External
Components
o
Outputs Adjustable from 0.8V to V
IN
o
1.8V/3.3V and 1.5V/2.5V Preset
o
All Ceramic Capacitor Application
o
Soft-Start Reduces Inrush Current
o
Fully Assembled and Tested
Evaluates: MAX1970/MAX1971/MAX1972
Selector Guide
PART
MAX1970EEE
MAX1971EEE
MAX1972EEE
POR
DELAY
TIME (TYP)
16.6ms
175ms
175ms
RSI
No
Yes
No
PFO
Yes
No
Yes
FREQUENCY
1.4MHz
0.7MHz
1.4MHz
Component Suppliers
SUPPLIER
Murata
Sumida
Taiyo-Yuden
PHONE
770-436-1300
847-956-0666
408-573-4150
WEBSITE
www.murata.com
www.sumida.com
www.taiyo-yuden.com
PART
MAX1972EVKIT
Ordering Information
TEMP RANGE
-40擄C to +85擄C
IC PACKAGE
16 QSOP
Note:
To evaluate the MAX1970 or MAX1971, request free sam-
ples of these parts with the MAX1972EVKIT.
Component List
DESIGNATION QTY
C1
1
DESCRIPTION
10碌F 鹵20%, 6.3V X5R
ceramic capacitor (1206)
Taiyo-Yuden JMK316BJ106ML
0.1碌F 鹵10%, 16V X7R
ceramic capacitors (0603)
Taiyo-Yuden EMK107BJ104KA
620pF 鹵10%, 50V X7R
ceramic capacitors (0603)
Murata GRM39X7R621K050AD
10碌F 鹵20%, 4V X5R
ceramic capacitors (0805)
Taiyo-Yuden AMK212BJ106MG
3-pin headers
DESIGNATION QTY
L1, L2
R1
R2, R3
R4
R5, R8
R6, R9, R10
R7
U1
None
None
None
2
1
2
1
2
0
1
1
3
1
1
DESCRIPTION
4.7碌H 鹵30%, 0.9A, 80m
鈩?/div>
inductors
Sumida CDRH3D16-4R7
10鈩?鹵5% resistor (0603)
100k鈩?鹵5% resistors (0603)
82k鈩?鹵5% resistor (0603)
0鈩?resistors (0603)
Not installed
39k鈩?鹵5% resistor (0603)
MAX1972EEE (16-pin QSOP)
Shunts
MAX1972EVKIT PC board
MAX1970/MAX1971/MAX1972
data sheet
C2, C3
2
C4, C7
2
C5, C6
JU1, JU2, JU3
2
3
________________________________________________________________
Maxim Integrated Products
1
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.
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