US2075
PWM SWITCHER CONTROLLER & 7.5A LOW DROPOUT REGULATOR COMBO
PATENT PENDING
FEATURES
The US2075 eliminates the need for a seperate switching controller IC Minimum part count allows lower system cost Fixed 3.30V/7.5A LDO on board On board MOSFET driver Fastest transient response of any controller method. ( 0 to 100% Duty Cycle in 100 nS ) 1% internal voltage reference Internal Thermal shutdown Internal Under Voltage Lockout protects MOSFET during start-up
DESCRIPTION
The US2075 is a dual function IC combining a switching controller and a 7.5A low dropout regulator all in a compact 7 pin TO220 and TO263 surface mount packages providing a total solution for dual supply processor applications such as an Intel P55C ™, AMD K6™, as well as Cyrix 6X86L™ and the M2™processors. Typically in these applications a dual supply regulator converts 5V to 3.3V for I/O supply and a jumper programmable supply of 2.8V to 3.5V for CORE supply .The linear regulator portion in the US2075 is a fixed 3.30V output and has a minimum of 7.5A current capability designed to provide ample current for most applications while the switching regulator controller uses the 5V supply to power the controller and the 12V supply to drive the power MOSFET, allowing a low cost N- MOS switch to be used. The IC also includes an error comparator for fastest 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.
APPLICATIONS
Dual supply low voltage processor applications, such as: P55C™,CYRIX M2™, POWER PC™ and AMD
TYPICAL APPLICATION
5V
V5 Vout Vhyst
7 6 5 4 3 2 1 2.8V / 10A 3.30V / 7.5A
US2075
Gnd Vfb V12 Drv
2075ap1a-1.0
12V
Typical application of US2075 in a flexible mother board designed for Intel P55™,P54™ AMD K5,K6™ as well as Cyrix M1™ and M2™ applications.
Notes: P54C,P55C 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
Tj (°C) 0 TO 125 7 PIN PLASTIC TO220 (T) US2075CT 7 PIN PLASTIC TO263 (M) US2075CM
Rev. 1.2 4/26/98
4-1
US2075
ABSOLUTE MAXIMUM RATINGS
12V Supply Voltage ............................................................. 14V 5V Supply Voltage .............................................................. 7V LDO Power Dissipation .................................... Internally Limited FB Pin Voltage........................................................ -0.3V to 5V Storage Temperature Range ................................. -65 TO 150°C Operating Junction Temperature ............................... O TO 150°C
PACKAGE INFORMATION
7 PIN PLASTIC TO220 (T)
FRONT VIEW 7 6 5 4 3 2 1
7 PIN PLASTIC TO263 (M)
FRONT VIEW 7 6 5 4 3 2 1
V5 Vout Vhyst Gnd Vfb V12 Drv
V5 Vout Vhyst Gnd Vfb V12 Drv
θJT=2.7°C/W θJA=60°C/W
θJA=35°C/W for 1" Square pad
ELECTRICAL SPECIFICATIONS
LDO Section
PARAMETER Output Voltage Line Regulation Load Regulation (note 1) Maximum Output Current Thermal Regulation Ripple Rejection
Unless otherwise specified the following specification applies over,V5=5V,V12=12V,and Tj=0 to 125°C.Low duty cycle pulse testing are used which keeps junction and case temperatures equal to the ambient temperature. SYM TEST CONDITION VOUT Io=0mA Io=0mA, 4.75