US3036
TYPICAL APPLICATION
5V to 2.5V for RDRAM Supply
C8
8 7 6 5
SS CS+ CS- Gnd
C6
US3036
Drv Vcc Vfb
NC
1 2 3 4
C3
R1
R3
C5
L2
R8
R7
R6
ATX
P.S.
5V
5V(S.B.)
Vout
L1
Q2
C1
C2
C4
R2
D1
R5
3036app1-1.3
C7
R4
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
U1
Q2
D1
L2
L1
R1
R2
R3
R4
R5
R6
R7,8
C1
C2
C3
C4
C5
C6
C7
C8
Description
LDO/Switcher IC
MOSFET
P Ch
Schottky Diode
Inductor
Inductor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Qty
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
Part #
US3036CS ( 8 pin SOIC)
IRF7204 (8 pin SOIC) or IRF7406 for 4A
SI9435DY (8 pin SOIC) or SI4431 for 4A
SK33DICT (SMC)
Core:T44-52,L=6 uH
Turns: 15T, 20 AWG
L=1 uH
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
3.57 kohm,1%, SMT 0805 size
470uF,10V, Elect
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
10CV1000DX, 1000uF,10V, Elect ,ESR=0.07 Ohm
0.15 uF
Manufacturer
Unisem
IR
Temic
Lite on
Micro Metal
(core)
Ohmite
Sanyo
Sanyo
Sanyo
Sanyo
Sanyo
4-4
Rev. 1.1
12/4/98
UNISEM [ UNISEM ]
