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
com-
pact 7 pin TO220 and TO263 surface mount
pack-
ages providing a
total solution
for dual supply proces-
sor applications such as an
Intel P55C
鈩?
AMD K6鈩?
as well as Cyrix 6X86L鈩?and the M2鈩rocessors.
Typically in these applications a dual supply regulator
converts 5V to 3.3V for I/O supply and a jumper pro-
grammable 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 sup-
ply 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鈩?CYRIX M2鈩? POWER PC鈩?and
AMD
TYPICAL APPLICATION
5V
V5
Vout
7
3.30V / 7.5A
6
Vhyst
5
US2075
Gnd
Vfb
4
3
V12
2
Drv
2075ap1a-1.0
1
2.8V / 10A
12V
Typical application of US2075 in a flexible mother board designed for Intel P55鈩?P54鈩?/div>
AMD K5,K6鈩?as well as Cyrix M1鈩?and M2鈩?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 (
擄
C)
0 TO 125
7 PIN PLASTIC
TO220 (T)
US2075CT
7 PIN PLASTIC
TO263 (M)
US2075CM
Rev. 1.2
4/26/98
4-1
1
2
3
4
