International Rectifier IRU3038 User Manual

IRU3038 EVALUATION BOARD USER GUIDE
INTRODUCTION
The IRU3038 controller IC is designed to provide a low
cost synchronous Buck regulator for voltage tracking
applications such DDR memory and general purpose
on-board DC to DC converter. Modern micro processors
combined with DDR memory, need high-speed bandwidth
data bus which requires a particular bus termination volt-
age. This voltage will be tightly regulated to track the
half of chipset voltage for best performance.
INPUT/OUTPUT CONNECTIONS
The following is the input/output connections:
Inputs:
J1: Input (+5V)
J2: Gnd
Outputs:
J5: V (+2.5V)
OUT
J6: Gnd
Other Connections:
J7: V (for tracking system)
DDQ
J3: V (output for reference voltage)
REF
Rev. 1.2
06/05/02
SPECIFICATION DATA
Switcher:
V = 5V
IN
V = 2.5V
OUT
I = 8A
OUT
DV
= 75mV
OUT
FS = 200KHz
The connection points is shown in Figure 1. Connect the
power supply cables according to this figure, minimize
wire lengths to reduce losses in the wire. Test point J8
and J9 provide easy connections for oscilloscope volt-
age probe to monitor the output inductor point and the
output voltages.
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IRDC3038
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