US3034CS UNISEM, US3034CS Datasheet

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US3034CS

Manufacturer Part Number
US3034CS
Description
8 PIN PWM SWITCHER CONTROLLER IC
Manufacturer
UNISEM
Datasheet

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FEATURES
APPLICATIONS
TYPICAL APPLICATION
PACKAGE ORDER INFORMATION
FEATURES
APPLICATIONS
TYPICAL APPLICATION
PACKAGE ORDER INFORMATION
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.
Rev. 1.8
1/13/99
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
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
12V
5V
C1
C8
L1
Typical application of US3034
R1
C2
C3
Drv V12 Vfb Vhyst
Q2
SS
8
1 2 3 4
0 TO 70
US3034
TA (°C)
CS+
7
CS-
6
C4
Gnd
5
R2
R3
D1
C5
DESCRIPTION
DESCRIPTION
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.
8 PIN PLASTIC
US3034CS
SOIC (S)
3034app1-1.0
L2
R4
R5
R8
8 PIN PWM SWITCHER
C6
R6
R7
C7
CONTROLLER IC
PRELIMINARY DATASHEET
Vout
US3034
4-1

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US3034CS Summary of contents

Page 1

... MOSFET for the minimum part count CS+ CS- Gnd US3034 Drv V12 Vfb Vhyst 3034app1-1.0 Typical application of US3034 TA (°C) 8 PIN PLASTIC SOIC ( US3034CS US3034 CONTROLLER IC PRELIMINARY DATASHEET Vout C7 4-1 ...

Page 2

US3034 ABSOLUTE MAXIMUM RATINGS ABSOLUTE MAXIMUM RATINGS V Supply Voltages ............................................................. 20V 12 F.B Pin Voltages........................................................ Storage Temperature Range ................................. -65 TO 150 C Operating Junction Temperature ............................... 0 TO 150 C PACKAGE INFORMATION PACKAGE INFORMATION 8 PIN PLASTIC SOIC ...

Page 3

PIN DESCRIPTIONS PIN DESCRIPTIONS PIN # PIN SYMBOL PIN DESCRIPTION A resistor divider from this pin to the output of the switching regulator and ground sets the Core supply voltage. This pin is connected to the minus ...

Page 4

US3034 TYPICAL APPLICATION TYPICAL APPLICATION Pentium Core Supply Application (US3034 and US3033 Dual Layout) Low Cost 4 Bit VID ** R9 12V can be elimi- nated if dual layout with US3033 is not desired ...

Page 5

... 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 Part # US3034CS ( 8 pin SOIC) IRL3303 (TO220) IRL3103S (TO263) (note 1) MBR1045CT (TO220) MBRB1545CT (TO263) (note1) ...

Page 6

... Part # US3034CS ( 8 pin SOIC) IRL3303 (TO220) IRL3103S (TO263) (note 1) MBR1045CT (TO220) MBRB1545CT (TO263) (note1) Core:T50-18,L=4 uH Turns: 10T, 18 AWG L ohm,5%, SMT 1206 size open for US3034, 10 ohm for US3033 10 ohm, 5%, SMT 1206 size 249 kohm,1%, SMT 0805 size ...

Page 7

... Drv V12 Vfb Vhyst Part # US3034CS ( 8 pin SOIC) IRL3303 (TO263) PBYR735(Axial Thr Hole pkg) PBYR1035B(SMT, TO263 pkg) Core:T50-18,L=4 uH Turns: 7T, 18 AWG L ohm,5%, SMT 182 kohm,1%, SMT 1 kohm,1%, SMT 576ohm,1%, SMT 3.83 kohm,1%, SMT 1 kohm,1% , SMT 470uF, Elect 6MV1000GX, 1000uF,6 ...

Page 8

US3034 APPLICATION INFORMATION APPLICATION INFORMATION Introduction The US3034 device is an application specific product designed to provide an on board switching supply for the new generation of microprocessors requiring separate Core and I/O supplies where the load current demand from ...

Page 9

Switcher Output Voltage Setting The output voltage can be set using the following equations. Assuming , Vo=3.38V and the selected output ripple is 1.3%(44mV) of the output voltage, a set of equations are derived that selects the resistor divider and ...

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