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US3033, US3033CS, US3034

Table of contents:
Info of US3033
Info of US3033CS
Info of US3034

US3033, US3033CS, US3034 Selling Leads, Datasheet

MFG:UNISEN Package Cooled:SOP8S D/C:07+

US3033, US3033CS, US3034 Datasheet download

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Part Number: US3033

MFG: UNISEN

Package Cooled: SOP8S

D/C: 07+

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US3033 General 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 ä, AMD K6ä, as well as Cyrix 6X86Lä and the M2äprocessors. 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 flexibility for the I/O regulator and has a minimum of 50mA drive current capability designed to provide ample current for an external pass transistor. 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 channel MOSFET switch to be used. The IC also includes an error comparator for fast transient response, a precise voltage reference for setting the output voltage as well as a direct drive of the MOSFET for the minimum part count.

US3033 Maximum Ratings

V12,V12SW Supply Voltages ..................................................20V
F.B Pin Voltages........................................................ -0.3V to 5V
Storage Temperature Range ................................. -65 TO 150°C
Operating Junction Temperature ...............................0 TO 150°C

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

US3033 Typical Application

· 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

US3033 Connection Diagram

US3034 General 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 programmable 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 channel MOSFET to be used. The IC also includes an error comparator for fast transient response, a precise voltage reference for setting the output voltage as well as a direct drive of the MOSFET for the minimum part count.

US3034 Maximum Ratings

V12 Supply Voltages ............................................................. 20V
F.B Pin Voltages........................................................ -0.3V to 5V
Storage Temperature Range ................................. -65 TO 150°C
Operating Junction Temperature ...............................0 TO 150°C

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

US3034 Typical Application

·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

US3034 Connection Diagram

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