IRDC3038
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.
SPECIFICATION DATA
Switcher:
V
IN
= 5V
V
OUT
= 2.5V
I
OUT
= 8A
DV
OUT
= 75mV
FS = 200KHz
INPUT/OUTPUT CONNECTIONS
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.
Rev. 1.2
06/05/02
www.irf.com
1
IRDC3038
LAYOUT
The top side (component) layer for IRU3038 Eval board
is shown in Figure 2. The input capacitors are all located
close to the MOSFETs. All the decoupling capacitors,
charge pump capacitor and feedback components are
located close to IC. The feedback resistors are tied to
the output voltage at the point of regulation.
The PCB is 4-layers board, one layer is dedicated to
Power GND and the analog GND is kept separated from
the PGND and it is connected at a single point.
Figure 2 - Top layer of evaluation-board for IRU3038.
Rev. 1.2
06/05/02
www.irf.com
3
IRDC3038
BILL OF MATERIAL
Ref Desig Description
MOSFET
Q1, Q2
U1
Controller
Diode
D1
L1
L2
C1
C2,C18
C10,C11
C5,C8
C4
C15
C9
C3,C6,C12
R9
R6
R8,R11
R2,R3,R5
R1,4,7,
10,12,13
C7,12,13,
14,16
D2
Inductor
Inductor
Cap, Tantalum
Cap, Poscap
Cap, Poscap
Cap, Ceramic
Cap, Ceramic
Cap, Ceramic
Cap, Ceramic
Cap, Ceramic
Resistor
Resistor
Resistor
Resistor
Resistor
Capacitor
Diode
Value
Qty
Part#
20V, 10mV, 12A
2 IRF7460
Synchronous PWM 1 IRU3038
Fast Switching,
1 BAT54S
Schottky
1mH, 10A
1 D03316P-102HC
3.3mH, 12A
1 D05022P-332HC
33mF, 16V
1 ECS-T1CD336R
47mF, 16V, 70mV
2 16TPB47M
150mF, 6.3V, 40mV 2 6TPC150M
0.1mF, Y5V, 25V
2 ECJ-2VF1E104Z
1mF, X7R, 25V
1 ECJ-3YB1E105K
1800pF, X7R, 50V
1 ECJ-2VB1H182K
470pF, X7R
1 ECJ-2VB2D471K
1mF, Y5V, 16V
3 ECJ-2VF1C105Z
26.1K, 5%
1
4.7V, 5%
1
1K, 1%
2
0V
3
Not Used
6
Not Used
Not Used
5
1
Manuf
IR
IR
IR
Coilcraft
Coilcraft
Panasonic
Sanyo
Sanyo
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Web site (www.)
irf.com
coilcraft.com
maco.panasonic.co.jp
sanyo.com/industrial
maco.panasonic.co.jp
Rev. 1.2
06/05/02
www.irf.com
5
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