19-2995; Rev 0; 9/03
MAX8529 Evaluation Kit
General Description
The MAX8529 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board demonstrating
the MAX8529 dual, synchronized, step-down controller.
The EV kit comes assembled with a circuit that steps
down from an 8V to 13.2V input voltage, to output volt-
ages of 1.8V and 3.3V. Both are capable of sourcing
3A. The switching frequency is set at 1.2MHz, and is
adjustable from 600kHz to 1.5MHz with an external
resistor. Alternatively, the controller can be synchro-
nized to an external clock generated by another
MAX8529 or a system clock. This device also features
soft-start and soft-stop. The MAX8529 eliminates the
need for current-sense resistors by utilizing the low-side
MOSFET鈥檚 on-resistance as the current-sense element.
The adjustable foldback current limit reduces power
dissipation during short-circuit conditions. The
MAX8529 includes a power-on reset output to signal
the system when both outputs reach regulation.
o
Low Output Noise in DSL Band
o
Ceramic Input/Output Capacitors
o
Foldback Current Limit
o
EV Kit Circuit Optimized for 8V to 13.2V Input
o
>85% Efficiency
o
Fixed-Frequency PWM Operation
o
Adjustable 600kHz to 1.5MHz Switching
Frequency
o
External SYNC Input
o
Clock Output for Master/Slave Synchronization
o
Soft-Start and Soft-Stop
o
RESET
Output with 140ms Minimum Delay
o
Lossless Current Limit (No Sense Resistor)
o
Surface-Mount Components
o
Fully Assembled and Tested
Features
Evaluates: MAX8529
Component List
DESIGNATION QTY
C1A, C1B,
C12A, C12B
4
DESCRIPTION
22碌F, 6.3V X5R ceramic capacitors
(1210)
Taiyo Yuden JMK325BJ226MM
10碌F, 25V X5R ceramic capacitors
(1812)
Taiyo Yuden TMK432BJ106KM
0.1碌F, 16V X7R ceramic capacitors
(0603)
TDK C1608X7R1C104K
330pF, 50V X7R ceramic capacitor
(0603)
TDK C1608X7R1H331K
1000pF, 50V X7R ceramic capacitor
(0603)
TDK C1608X7R1H102K
27pF, 50V C0G ceramic capacitors
(0603)
TDK C1608C0G1H270J
0.22碌F, 10V X5R ceramic capacitor
(0603)
Taiyo Yuden LMK107BJ224MA
PART
MAX8529EVKIT
Ordering Information
TEMP RANGE
0掳C to +70掳C
IC PACKAGE
24 QSOP
Recommended Equipment
鈥?/div>
鈥?/div>
鈥?/div>
+8V to +13.2V, 5A, variable-output power supply
Two dummy loads capable of sinking 3A
Two digital multimeters (DMM)
C2, C11
2
C3, C10
2
Quick Start
The MAX8529 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) Preset the power supply to +8V and turn off the
power supply.
2) Connect the positive lead of the power supply to the
VIN pad on the EV kit, and the negative lead of the
power supply to the GND pad.
3) Connect the positive input of one DMM to VOUT1,
and the negative input of the DMM to GND to mea-
sure the output voltage at VOUT1.
4) Connect the positive input of the other DMM to
VOUT2, and the negative input of the DMM to GND
to measure the output voltage at VOUT2.
5) Turn on the power supply and sweep the input volt-
age from 8V to 13.2V.
1
C4
1
C5
1
C6, C14
2
C7
1
________________________________________________________________
Maxim Integrated Products
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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