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US2076 Datasheet(PDF) 1 Page - UNISEM

Part No. US2076
Description  PWM SWITCHER CONTROLLER & 7.5A ADJUSTABLE LOW DROPOUT REGULATOR COMBO
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Maker  UNISEM [UNISEM]
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US2076 Datasheet(HTML) 1 Page - UNISEM

   
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US2076
4-1
Rev. 1.3
4/26/98
PWM SWITCHER CONTROLLER & 7.5A
ADJUSTABLE LOW DROPOUT REGULATOR COMBO
TYPICAL APPLICATION
TYPICAL APPLICATION
Typical application of US2076 in a flexible motherboard designed for Intel
P55
™,P54™, AMD K5 & K6™ as well as Cyrix M1™ and M2™ applications.
Tj (°C)
7 PIN PLASTIC
7 PIN PLASTIC
TO220 (T)
TO263 (M)
0 TO 125
US2076CT
US2076CM
DESCRIPTION
DESCRIPTION
The US2076 is a dual function IC combining a
switching controller and a 7.5A adjustable low
dropout regulator all in a compact 7 pin TO220 and
TO263 surface mount packages providing a total so-
lution 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 sup-
ply and a jumper programmable supply of 1.25V to 3.5V
for CORE supply.The linear regulator portion in the
US2076 is an adjustable one that can be programmed
to 3.30V output and has a minimum of 7.5A current ca-
pability designed to provide ample current for most ap-
plications. The US2076 uses an internal regulator gen-
erated from the 12V supply to power the switching con-
troller 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 com-
parator for fast transient response, a precise voltage ref-
erence for setting the output voltage as well as a direct
drive of the MOSFET for the minimum part count.
FEATURES
FEATURES
The US2076 eliminates the need for a
seperate switching controller IC
Minimum part count allows lower system cost
Adjustable 7.5A LDO on board
1.1V Dropout at 7.5A
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
APPLICATIONS
APPLICATIONS
Dual supply low voltage processor applications,
such as: P55C
™,CYRIX M2™, POWER PC™ and
AMD K6
PATENT PENDING
PRELIMINARY DATASHEET
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
PACKAGE ORDER INFORMATION
2076app1-1.2
12V
5V
C1
L1
R1
Q2
D1
C3
C2
C7
L2
C6
R4
R7
R6
D2
CPU
I / O
Vcc2 Det
Core
R8
5V
R5
US2076
Drv
V12
Vfb1
Gnd
Vfb2
Vout
Vin
1
2
3
4
5
6
7


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