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US2075CTのメーカーはUNISEMです、この部品の機能は「PWM SWITCHER CONTROLLER & 7.5A LOW DROPOUT REGULATOR COMBO」です。 |
部品番号 | US2075CT |
| |
部品説明 | PWM SWITCHER CONTROLLER & 7.5A LOW DROPOUT REGULATOR COMBO | ||
メーカ | UNISEM | ||
ロゴ | |||
このページの下部にプレビューとUS2075CTダウンロード(pdfファイル)リンクがあります。 Total 4 pages
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
APPLICATIONS
Dual supply low voltage processor applications,
such as: P55C™,CYRIX M2™, POWER PC™ and
AMD
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 ™, 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 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.
TYPICAL APPLICATION
5V
2075ap1a-1.0
US2075
V5 7
Vout 6
Vhyst 5
Gnd 4
Vfb 3
V12 2
Drv 1
12V
3.30V / 7.5A
2.8V / 10A
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
1 Page Note 1 : Low duty cycle pulse testing with Kelvin con-
nections are required in order to maintain accurate data.
US2075
PIN DESCRIPTIONS
PIN #
3
6
7
4
1
5
2
PIN SYMBOL
Vfb
Vout
V5
Gnd
Drv
Vhyst
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 10uF capacitor must be
connected from this pin to ground to insure stability. This voltage is set at 3.30V typ.
The input pin of the 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 1.3V
higher than Vout 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. A high
frequency capacitor must be connected from V12 to this pin to insure proper operation.
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 from this
pin to the gate in order to reduce switching noise.
A resistor is connected from this pin to the Vfb pin to set the output ripple voltage.
See application note for more details.
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 Vhyst
25
Drv
1
Gnd
4
Vfb V5
37
UVLO
PWM Control
1.25V
Vref
2075blk1-1.0
Vout
6
7.5A LDO
Rev. 1.2
4/26/98
Figure 1 - Simplified block diagram of the US2075
4-3
3Pages | |||
ページ | 合計 : 4 ページ | ||
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PDF ダウンロード | [ US2075CT データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
US2075C | DUAL-CHANNEL POWER DISTRIBUTION CONTROL SWITCH | Unisonic Technologies |
US2075CM | PWM SWITCHER CONTROLLER & 7.5A LOW DROPOUT REGULATOR COMBO | UNISEM |
US2075CT | PWM SWITCHER CONTROLLER & 7.5A LOW DROPOUT REGULATOR COMBO | UNISEM |