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PDF US3034CS Data sheet ( Hoja de datos )
| Número de pieza | US3034CS | |
| Descripción | 8 PIN PWM SWITCHER CONTROLLER IC | |
| Fabricantes | UNISEM | |
| Logotipo |  |
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US3034
FEATURES
8 pin SOIC Switching Controller with
HICCUP Current Limiting Reduces Diode
Power Dissipation to Less than 1% of Normal
Operation
Soft Start Capacitor allows for smooth Output
Voltage ramp up
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
8 PIN PWM SWITCHER
DESCRIPTION
CONTROLLER IC
PRELIMINARY DATASHEET
The US3034 IC provides an 8 pin low cost switching
controller with true short circuit protection all in a
compact 8 pin surface mount package, providing a
low cost switching solution for dual supply processor
applications that require switching regulator for the 3.3V
supply such as the applications with AGP on board.
Typically in these applications a dual supply regulator
converts 5V to 3.3V for I/O supply and a jumper pro-
grammable supply of 1.25V to 3.5V for CORE supply .
The IC uses an internal 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 chan-
nel MOSFET to be used. The IC also includes an error
comparator for fast transient response, a precise volt-
age reference for setting the output voltage as well as a
direct drive of the MOSFET for the minimum part count.
TYPICAL APPLICATION
C8
12V
L1
5V
C1
8765
SS CS+ CS- Gnd
US3034
Drv V12 Vfb Vhyst
1234
C3
R3
R1
C5
Q2
C2
C4
R2 D1
C6
R8 R7
L2 R6
R4
Vout
C7
R5
3034app1-1.0
Typical application of US3034
Notes: 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)
US3034CS
Rev. 1.8
1/13/99
4-1
1 page  
US3034
Pentium Core Supply Application Parts List (US3034 and US3033 Dual Layout)
Low Cost 4 Bit VID
Ref Desig Description
U1 LDO/Switcher IC
Q2 MOSFET
D1 Schottky Diode
L2 Inductor
L1
R1
R2
R3
R4A *
R4B *
R5A
R5B
R5C
R5D
R5E
R6
R7
R8
R9
C1
C2
C3
C4
C5
C7
C8
C6
HS1
HS2
Inductor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Heat Sink
Heat Sink
Qty Part #
1 US3034CS ( 8 pin SOIC)
1 IRL3303 (TO220)
IRL3103S (TO263) (note 1)
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 5 miliohm,5%, 2W
1 4.99 kohm,1%, SMT 0805 size
1 4.7 kohm,5% for US3034, open for 3033
1 open for US3034, 10 ohm for US3033
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
4 6MV1500GX, 1500uF,6.3V, Elect
1 0.047 uF for 3034 , 0.1uf for 3033
1 4700pF for US3034, open for US3033
1 For MOSFET , 577002
1 For Schottky Diode , 577002
Manufacturer
Unisem
International
Rectifier
Motorola
Micro Metal
(core)
Sanyo
Sanyo
Sanyo
Sanyo
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. 1.8
1/13/99
4-5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet US3034CS.PDF ] | |
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