DataSheet.jp

US3033CS の電気的特性と機能

US3033CSのメーカーはUNISEMです、この部品の機能は「PWM SWITCHER & LINEAR CONTROLLER IC」です。


製品の詳細 ( Datasheet PDF )

部品番号 US3033CS
部品説明 PWM SWITCHER & LINEAR CONTROLLER IC
メーカ UNISEM
ロゴ UNISEM ロゴ 




このページの下部にプレビューとUS3033CSダウンロード(pdfファイル)リンクがあります。
Total 9 pages

No Preview Available !

US3033CS Datasheet, US3033CS PDF,ピン配置, 機能
US3033
FEATURES
LDO Controller allows the use of a low cost
pass transistor for the I/O supply
8 pin SOIC combines switching and linear
controller
Internal Pre-regulator Eliminates Cross talk
between Switching & Linear regulators
Automatic shut down of the linear regulator
when connected to the Vcc2 Det pin
On board MOSFET driver
Fastest transient response of any controller
method. ( 0 to 100% Duty Cycle in 100 nS )
1% internal voltage reference
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
Simple 5V to 3.3V switcher for Pentium with AGP
or Pentium IIapplications
PWM SWITCHER & LINEAR
CONTROLLER IC
DESCRIPTION
The US3033 IC combines a switching controller and
a linear regulator controller all in a compact 8 pin
surface mount package, providing a total solution for
dual supply processor applications such as an Intel
P55C , AMD K6, as well as Cyrix 6X86Land
the M2processors. Typically in these applications a
dual supply regulator converts 5V to 3.3V for I/O supply
and a jumper programmable supply of 1.25V to 3.5V for
CORE supply .The linear regulator controller portion in
the US3033 is a programmable controller allowing flex-
ibility for the I/O regulator and has a minimum of 50mA
drive current capability designed to provide ample cur-
rent for an external pass transistor. The IC uses an inter-
nal regulator generated from the 12V supply to power
the controller 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
Q1
5V
C1 R10
12V
R9
C8 8 7 6 5
V12 Drv2 Vfb2 Gnd
US3033
Drv1V12swVfb1 Vhyst
1234
C3
L1
R3
Q2
C2
D1
I/O
R6
C6
D2 R7
5V
CPU
R8
Vcc2 Det
L2
C5 Core
R4
3033app1-1.1
C7
R5
Typical application of US3033 in a flexible mother board designed for Intel P55,P54
AMD K5,K6as well as Cyrix M1and M2applications.
Notes: P54C,P55C,Pentium II 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
TA (°C)
0 TO 70
8 PIN PLASTIC
SOIC (S)
US3033CS
Rev. 1.5
1/14/99
4-1

1 Page





US3033CS pdf, ピン配列
US3033
PIN DESCRIPTIONS
PIN #
3
6
7
5
1
4
2
8
PIN SYMBOL
VFB1
VFB2
Drv2
Gnd
Drv1
VHYST
V12SW
V12
PIN DESCRIPTION
A resistor divider from this pin to the output of the switching regulator and ground sets the
Core supply voltage.
The feedback pin of the linear regulator. A resistor divider from this pin to the output of the
linear regulator and ground sets the I/O supply voltage.
The drive pin of the linear regulator. This pin controls the base of a transistor or the gate
of a MOSFET acting as the series pass element for the linear regulator.
This pin is connected to the IC substrate and must be connected to the lowest potential
in the system.
The PWM output of the switching controller. This pin is a totem pole drive that is con-
nected 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 and a 10pF capacitor is connected from this pin to the VFB1 pin to set the
output ripple voltage for the switching regulator.
This pin supplies the voltage to the PWM drive and hysterises circuitry and it is con-
nected to the 12V supply. A 1 uF, high frequency capacitor must be connected from this
pin to ground to provide the peak current for charging and discharging of the MOSFET.
This pin provides the biasing for the chip and drive for the linear regulator controller. It
isconnected to 12V supply. A 10 ohm resistor in series from this pin to the 12V supply
and a 1uF, high frequency capacitor connected from this pin to Gnd is required to filter
the switching noise of the switching regulator.
BLOCK DIAGRAM
V12sw Vhyst
24
Drv 1
1
Gnd
5
Vfb 1
3
V12
8
UVLO
PWM Control
1.25V
Vref
3033blk1-1.0
5V Reg
Drv 2
7
Vfb2
6
Rev. 1.5
1/14/99
Figure 1 - Simplified block diagram of the US3033
4-3


3Pages


US3033CS 電子部品, 半導体
US3033
TYPICAL APPLICATION
5V to 3.3V for Pentium Application with AGP or Pentium II Application without ATX power supply
Dual mode Operation between Switching or Linear mode.
R13 C9
R9
12V
C8
R10 R1A
8765
V12 Drv2 Vfb2 Gnd
U1
Drv1V12swVfb1 Vhyst
1234
C3
R1B
R3
C5
Figure3- This unique application of US3033 allows the de-
signer to switch between Linear or Switching mode of
R6 operation using a single IC. This circuit has the flexibility
to be used for low current operation in Linear mode for
cost reasons and yet be able to operate in the Switching
R7 mode if the load current increases and the heat gener-
ated by the Linear operation will be an issue. Table below
descibes the components that will be effected for the
two modes of operation.
L2
Vout
L1 C7
5V
C1
Q2
C2
C4
R2 D1
R4
R5
3033app3-1.3
Note 1: For the applications where it is desirable to
eliminate the heat sink, the IRL3103S for Q2 and
MBR1545CT for D2 in TO263 packages with minimum of
1" square copper pad can be used.
Mode of Operation
Switching
Linear
L1 L2 D1 C4 C5
VV VVV
SS OOO
R1A R1B R2
OVV
V OO
R3 R4 R5 R6 R7
V VV VO
O VO VV
V = See parts list for value S = Short O = Open
Ref Desig Description
U1 LDO/Switcher IC
Q2 MOSFET
D1 Schottky Diode
L2 Inductor
L1
R1A
R1B
R2
R3
R4
R5
R6
R7
R9
R10
R13
C1,2
C3
C4
C5
C7
C8
C9
HS1
Inductor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Heat Sink
HS2 Heat Sink
Qty Part #
1 US3033CS ( 8 pin SOIC)
1 IRL3303 (TO220)
IRL3103S (TO263) (note 1)
1 MBR1045CT (TO220)
MBRB1545CT (TO263) (note1)
1 Core:T50-18,L=4 uH
Turns: 10T, 18 AWG
1 L=2 uH
1 2.4k ohm,5%, SMT 1206 size
1 22 ohm,5%, SMT 1206 size
1 10 ohm, 5%, SMT 1206 size
1 249 kohm,1%, SMT 0805 size
1 1 kohm,1%, SMT 0805 size
1 576 ohm,1%, SMT 0805 size
1 180 ohm,1%, SMT 0805 size
1 100 ohm,1%, SMT 0805 size
1 10 ohm, 5%, SMT 1206 size
1 1k ohm, 5%, SMT 1206 size
1 7.5k ohm, 5%, SMT 1206 size
2 6MV1500GX, 1500uF,6.3V, Elect
1 1 uF,Ceramic, SMT 0805 size
1 470 pF,Ceramic, SMT 0805 size
1 10 pF,Ceramic, SMT 0805 size
1 6MV1500GX, 1500uF,6.3V, Elect
1 1 uF,Ceramic, SMT 0805 size
1 470pF,Ceramic, SMT 0805 size
1 For MOSFET in Switching mode , 577002
For MOSFET in Linear mode :
507222 (3.3V current<5A),
576602 (3.3V current< 3.5A)
1 For Schottky Diode , 577002
Manufacturer
Unisem
International
Rectifier
Motorola
Micro Metal
(core)
Sanyo
Sanyo
Sanyo
Sanyo
Aavid
Aavid
4-6
Rev. 1.5
1/14/99

6 Page



ページ 合計 : 9 ページ
 
PDF
ダウンロード
[ US3033CS 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。


共有リンク

Link :


部品番号部品説明メーカ
US3033CS

PWM SWITCHER & LINEAR CONTROLLER IC

UNISEM
UNISEM


www.DataSheet.jp    |   2020   |  メール    |   最新    |   Sitemap