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PDF US3033 Data sheet ( Hoja de datos )
| Número de pieza | US3033 | |
| Descripción | PWM SWITCHER & LINEAR CONTROLLER IC | |
| Fabricantes | UNISEM | |
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US3033
FEATURES
LDO Controller allows the use of a low cost
pass transistor for the I/O supply
8 pin SOIC combines switching and linear
controller
Internal Pre-regulator Eliminates Cross talk
between Switching & Linear regulators
Automatic shut down of the linear regulator
when connected to the Vcc2 Det pin
On board MOSFET driver
Fastest transient response of any controller
method. ( 0 to 100% Duty Cycle in 100 nS )
1% internal voltage reference
Internal Under Voltage Lockout protects
MOSFET during start-up
APPLICATIONS
Dual supply low voltage processor applications,
such as: P55C™,CYRIX M2™, POWER PC™ and
AMD K6™
Simple 5V to 3.3V switcher for Pentium with AGP
or Pentium II™ applications
PWM SWITCHER & LINEAR
CONTROLLER IC
DESCRIPTION
The US3033 IC combines a switching controller and
a linear regulator controller all in a compact 8 pin
surface mount package, providing a total solution for
dual supply processor applications such as an Intel
P55C ™, AMD K6™, as well as Cyrix 6X86L™ and
the M2™processors. Typically in these applications a
dual supply regulator converts 5V to 3.3V for I/O supply
and a jumper programmable supply of 1.25V to 3.5V for
CORE supply .The linear regulator controller portion in
the US3033 is a programmable controller allowing flex-
ibility for the I/O regulator and has a minimum of 50mA
drive current capability designed to provide ample cur-
rent for an external pass transistor. The IC uses an inter-
nal regulator generated from the 12V supply to power
the controller as well as the 12V supply to drive the power
MOSFET, allowing a low cost N channel MOSFET
switch to be used. The IC also includes an error com-
parator for fast transient response, a precise voltage ref-
erence for setting the output voltage as well as a direct
drive of the MOSFET for the minimum part count.
TYPICAL APPLICATION
Q1
5V
C1 R10
12V
R9
C8 8 7 6 5
V12 Drv2 Vfb2 Gnd
US3033
Drv1V12swVfb1 Vhyst
1234
C3
L1
R3
Q2
C2
D1
I/O
R6
C6
D2 R7
5V
CPU
R8
Vcc2 Det
L2
C5 Core
R4
3033app1-1.1
C7
R5
Typical application of US3033 in a flexible mother board designed for Intel P55™,P54™
AMD K5,K6™ as well as Cyrix M1™ and M2™ applications.
Notes: P54C,P55C,Pentium II are trade marks of Intel Corp. K5 & K6 are trade marks of AMD corp. Cyrix 6X86L,M1,M2 are trade marks
of Cyrix Corp. Power PC is trade mark of IBM Corp.
PACKAGE ORDER INFORMATION
TA (°C)
0 TO 70
8 PIN PLASTIC
SOIC (S)
US3033CS
Rev. 1.5
1/14/99
4-1
1 page  
US3033
Pentium Dual Supply Application Parts List
Ref Desig
U1
Q1
Q2
Description
LDO/Switcher IC
MOSFET
MOSFET
D2 Diode, GP
D1 Schottky Diode
L2 Inductor
L1
R1
R2
R3
R4A *
R4B *
R5A
R5B
R5C
R5D
R5E
R6
R7
R8
R9
R10
R11
R13
C1
C2
C3
C4
C5
C6
C7
C8
C9
HS1
HS2
HS3
Inductor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Heat Sink
Heat Sink
Heat Sink
Qty Part #
1 US3033CS ( 8 pin SOIC)
1 MTP3055 (TO220)
1 IRL3303 (TO220)
IRL3103S (TO263) (note 1)
1 1N4148
1 MBR1045CT (TO220)
MBRB1545CT (TO263) (note1)
1 Core:T50-18,L=4 uH
Turns: 10T, 18 AWG
1 L=2 uH
1 22 ohm,5%, SMT 1206 size
1 10 ohm, 5%, SMT 1206 size
1 324 kohm,1%, SMT 0805 size
1 806 ohm,1%, SMT 0805 size
1 90.9 kohm,1%, SMT 0805 size
1 1.24 kohm,1%, SMT 0805 size
1 2.49 kohm,1%, SMT 0805 size
1 4.99 kohm,1%, SMT 0805 size
1 10 kohm,1%, SMT 0805 size
1 1.30 kohm,1%, SMT 0805 size
1 2k ohm,1%, SMT 0805 size
1 1.21k ohm,1%, SMT 0805 size
1 1 kohm,5%, SMT 0805 size
1 10 ohm,5%, SMT 0805 size
1 1k ohm,5%, SMT 0805 size
1 2.4k ohm,5%, SMT 0805 size
1 7.5k ohm,5%, SMT 0805 size
1 6MV1500GX, 1500uF,6.3V, Elect
1 6MV1500GX, 1500uF,6.3V, Elect
1 1 uF,Ceramic, SMT 0805 size
1 470 pF,Ceramic, SMT 0805 size
1 10 pF,Ceramic, SMT 0805 size
1 6MV1500GX, 1500uF,6.3V, Elect
4 6MV1500GX, 1500uF,6.3V, Elect
1 1 uF,Ceramic, SMT 0805 size
1 470pF ,Ceramic, SMT 0805 size
1 For MOSFET , 577002
1 For Schottky Diode , 577002
1 For Q1 , 507222 (I/O curren<5A)
576602 (I/O current< 3.5A)
Manufacturer
Unisem
Motorola
International
Rectifier
Motorola
Micro Metal
(core)
Sanyo
Sanyo
Sanyo
Sanyo
Sanyo
Aavid
Aavid
Aavid
* R4 is a parallel combination of R4A and R4B.
Note 1: For the applications where it is desirable to eliminate the heat sink, the IRL3103S for Q2 and MBR1545CT for D2 in TO263
packages with minimum of 1" square copper pad can be used.
Rev. 1.5
1/14/99
4-5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet US3033.PDF ] | |
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