IRDC3038
1
Rev. 1.2
06/05/02
www.irf.com
SPECIFICATION DATA
INTRODUCTION
IRU3038 EVALUATION BOARD USER GUIDE
INPUT/OUTPUT CONNECTIONS
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.
Switcher:
V
IN
= 5V
V
OUT
= 2.5V
I
OUT
= 8A
D
V
OUT
= 75mV
FS = 200KHz
The following is the input/output connections:
Inputs:
J1: Input (+5V)
J2: Gnd
Outputs:
J5: V
OUT
(+2.5V)
J6: Gnd
Other Connections:
J7: V
DDQ
(for tracking system)
J3: V
REF
(output for reference voltage)
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.