US3036
TYPICAL APPLICATION
5V to 2.5V for RDRAM Supply
C6
C8
8
7 6 5
SS CS+ CS- Gnd
US3036
Drv Vcc Vfb NC
1
2 3
4
R8
R7
C3
R3
C5
L2
R1
R6
ATX
Vout
P.S.
C7
L1
5V
C4
Q2
R4
R5
5V(S.B.)
C1
C2
R2
D1
3036app1-1.3
Figure 2- The circuit in figure 2 is the application of the US3036 providing a low cost solution for a 2.5V/2A supply from
the 5V dual supply. This circuit uses current sense resistor to set the current limiting.
Ref Desig Description
Qty
1
1
Part #
Manufacturer
Unisem
IR
U1
Q2
LDO/Switcher IC
MOSFET
P Ch
US3036CS ( 8 pin SOIC)
IRF7204 (8 pin SOIC) or IRF7406 for 4A
SI9435DY (8 pin SOIC) or SI4431 for 4A
SK33DICT (SMC)
Temic
Lite on
D1
L2
Schottky Diode
1
1
Inductor
Core:T44-52,L=6 uH
Turns: 15T, 20 AWG
Micro Metal
(core)
L1
Inductor
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
L=1 uH
R1
R2
R3
R4
R5
R6
R7,8
C1
C2
C3
C4
C5
C6
C7
C8
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
10 ohm,5%, SMT 1206 size
10 ohm, 5%, SMT 1206 size
200 kohm,1%, SMT 0805 size
1 kohm,1%, SMT 0805 size
1 kohm,1%, SMT 0805 size
5 miliohm,5%, 2W
Ohmite
3.57 kohm,1%, SMT 0805 size
470uF,10V, Elect
Sanyo
Sanyo
10CV1000DX, 1000uF,10V, Elect ,ESR=0.07 Ohm
1 uF,Ceramic, SMT 0805 size
470 pF,Ceramic, SMT 0805 size
10 pF,Ceramic, SMT 0805 size
4700pF
Sanyo
Sanyo
10CV1000DX, 1000uF,10V, Elect ,ESR=0.07 Ohm
0.15 uF
Sanyo
Rev. 1.1
12/4/98
4-4
UNISEM [ UNISEM ]
