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US2076CT の電気的特性と機能

US2076CTのメーカーはUNISEMです、この部品の機能は「PWM SWITCHER CONTROLLER & 7.5A ADJUSTABLE LOW DROPOUT REGULATOR COMBO」です。


製品の詳細 ( Datasheet PDF )

部品番号 US2076CT
部品説明 PWM SWITCHER CONTROLLER & 7.5A ADJUSTABLE LOW DROPOUT REGULATOR COMBO
メーカ UNISEM
ロゴ UNISEM ロゴ 




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US2076CT Datasheet, US2076CT PDF,ピン配置, 機能
US2076
PWM SWITCHER CONTROLLER & 7.5A
FEATURES
ADJUSTABLE LOW DROPOUT REGULATOR COMBO
PATENT PENDING
PRELIMINARY DATASHEET
DESCRIPTION
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
Dual supply low voltage processor applications,
such as: P55C,CYRIX M2, POWER PCand
AMD K6
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 M2processors. 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.
TYPICAL APPLICATION
5V
US2076
Vin 7
Vout 6
Vfb2 5
Gnd 4
Vfb1 3
V12 2
Drv 1
2076app1-1.2
12V
C3
L1
C1
D2
R1 C2
Q2
D1
R6
R7
L2
5V
R8
R4
I/O
C6
CPU
Vcc2 Det
Core
C7
R5
Typical application of US2076 in a flexible motherboard designed for Intel
P55,P54, AMD K5 & K6as well as Cyrix M1and M2applications.
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)
US2076CT
7 PIN PLASTIC
TO263 (M)
US2076CM
Rev. 1.3
4/26/98
4-1

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US2076CT pdf, ピン配列
US2076
Note 1 : Low duty cycle pulse testing with Kelvin con-
nections are required in order to maintain accurate data.
Note 2 : Drop-out voltage is defined as the minimum
differential voltage between Vin and Vout required to main-
tain regulation at Vout. It is measured when the output
voltage drops 1% below its nominal value.
Note 3 : Minimum load current is defined as the mini-
mum current required at the output in order for the out-
put voltage to maintain regulation. Typically the resistor
dividers are selected such that it automatically main-
tains this current.
PIN DESCRIPTIONS
PIN #
3
6
7
4
1
5
2
PIN SYMBOL
Vfb1
Vout
Vin
Gnd
Drv
Vfb2
V12
PIN DESCRIPTION
A resistor divider from this pin to the output of the switching regulator and
ground sets the Core supply voltage.
The output of the linear regulator. A minimum of a 100uF low ESR capacitor must be
connected from this pin to ground to insure stability.
The input pin of the linear regulator. Typically a large storage capacitor is connected
from this pin to ground to insure that the input voltage does not sag below the minimum
drop out voltage during the load transient response. This pin must always be higher than
Vout plus the maximum dropout voltage in order for the device to regulate properly.
This pin is connected to the IC substrate and must be connected to the lowest
potential in the system. It is also connected to the Tab of the package.
The PWM output of the switching controller. This pin is a totem pole drive that is
connected to the gate of the power MOSFET. A resistor may be placed in series from
this pin to the gate in order to reduce switching noise.
A resistor divider from this pin to the output of the linear regulator and
ground sets the I/O supply voltage.
This pin is connected to the 12V supply voltage. A high frequency cap must be
connected from this pin to the GND pin of the IC.
BLOCK DIAGRAM
V12
2
Drv
1
Gnd
4
Vfb 1
3
Vin
7
UVLO
PWM Control
1.25V
Vref
2076blk1-1.1
5V Reg
Vout
6
Vfb2
5
Rev. 1.3
4/26/98
Figure 1 - Simplified block diagram of the US2076
4-3


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共有リンク

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部品番号部品説明メーカ
US2076CM

PWM SWITCHER CONTROLLER & 7.5A ADJUSTABLE LOW DROPOUT REGULATOR COMBO

UNISEM
UNISEM
US2076CT

PWM SWITCHER CONTROLLER & 7.5A ADJUSTABLE LOW DROPOUT REGULATOR COMBO

UNISEM
UNISEM


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