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UNISEM - 8 PIN PWM SWITCHER CONTROLLER IC

Numéro de référence US3034
Description 8 PIN PWM SWITCHER CONTROLLER IC
Fabricant UNISEM 
Logo UNISEM 





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US3034 fiche technique
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 PCand
AMD K6
Simple 5V to 3.3V switcher for Pentium with AGP
or Pentium IIapplications
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

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