US3034 PDF预览

US3034

更新时间: 2025-10-06 22:17:07
品牌 Logo 应用领域
UNISEM 控制器
页数 文件大小 规格书
9页 77K
描述
8 PIN PWM SWITCHER CONTROLLER IC

US3034 数据手册

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US3034  
8 PIN PWM SWITCHER  
CONTROLLER IC  
PRELIMINARY DATASHEET  
FEATURES  
DESCRIPTION  
8 pin SOIC Switching Controller with  
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.  
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: P55Cä ,CYRIX M2ä , POWER PCä and  
AMD K6ä  
Simple 5V to 3.3V switcher for Pentium with AGP  
or Pentium IIä applications  
TYPICAL APPLICATION  
C6  
C8  
8
7 6 5  
SS CS+ CS- Gnd  
US3034  
Drv V12 Vfb Vhyst  
1
2
3
4
R8  
R7  
12V  
5V  
C3  
R3  
C5  
L2  
R1  
R6  
Vout  
C7  
L1  
C4  
Q2  
R4  
R5  
C1  
C2  
R2  
D1  
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)  
8 PIN PLASTIC  
SOIC (S)  
0 TO 70  
US3034CS  
Rev. 1.8  
1/13/99  
4-1  

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