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SC2453のメーカーはSemtech Corporationです、この部品の機能は「High Performance Quad Output Switching Regulator」です。 このページではSC2453の詳細な仕様と技術情報(パラメータ、電気的特性、ピン配置など)を見つけることができます. |
SC2453 の電気的特性と機能
| 部品番号 | SC2453 |
| |
| 部品説明 | High Performance Quad Output Switching Regulator | ||
| メーカ | Semtech Corporation | ||
| ロゴ |  |
||
このページの下部にプレビューとSC2453ダウンロード（pdfファイル）リンクがあります。 Total 14 pages
www.DataSheet4U.com
POWER MANAGEMENT
Description
SC2453 is a high performance multi-output converter
controller that can be configured for a variety of applica-
tions. The SC2453 utilizes synchronous rectified buck
topologies where efficiency is most important. It also
provides dedicated programmable positive and negative
linear regulators using external transistors in conjunction
with coupled windings to generate positive and negative
voltages. Power up sequencing prevents converter latch-
ups.
The two buck converters are out of phase, reducing in-
put ripple, allowing for fewer input capacitors. All con-
verters are synchronized to prevent beat frequencies.
High frequency operation will reduce ripple and minimize
noise. It also reduces the size of output inductors and
capacitors. Other features include soft start, power-good
signaling, bootstrapping for high side MOSFETs, and fre-
quency synchronization.
Typical Application Circuit
SC2453
High Performance Quad Output
Switching Regulator
PRELIMINARY
Features
Two synchronized converters for low noise
Power up sequencing to prevent latch-ups
Out of phase operation for low input ripple
Over current protection
Wide input range, 4.5 to 30V
Programmable frequency up to 700KHz
Two synchronous bucks for high efficiency at high
current
One dedicated programmable positive linear
regulator and one dedicated programmable nega-
tive linear regulator
–40 to 105 degree C operating temperature
Output voltage as low as 0.5V
Small package TSSOP-28
Applications
DSL applications with multiple input voltage re-
quirements
Mixed-Signal applications requiring positive and
negative voltages
Cable modem power management
Base station power management
+8-30V
Q1 C29
C30
C29
R28
+3.3V
+2.5V
R31
C32
-12V
R32
C32
C29
R31
C29
16 22
6
AVCC
SS
PVCC
9 OSC
7 SYNC/SHDN
8 POK
28 27
BDI VIN
BST2
GD2H
PH2
GD2L
C32
Q2
R31
Q12 R32
C32 C32
4
R31
5
11
C31
10
BD4 SC2453
FB4
BD3
FB3
AGND PGND
15 21
ILIM2
14
FB2
EO2
BST1
GD1H
PH1
GD1L
FB1
EO1
ILIM1
1
R28 R28
17
18
19
20
13
12
26
25
24
23
2
3
D10 D11
C31
R32 C34
C35
C31
C41
C42 R39
Q11
Q11
Q14
Q15
D11
L8
L9
C30
C33
+3.3V
R30
R33
+1.5V
C38
R35
R38
R32
+3.3V
Revision 5, August 2002
1
www.semtech.com
1 Page  
SC2453
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Parameter
Test Conditions
Positive Linear Regulator
Feedback Voltage
Feedback Input Leakage Current
Amplifier Transconductance
Drive Sink Current
VFB4 = 0.5V, IB04 = 0.5 to 5mA (sink)
Negative Linear Regulator
Feedback Voltage
Feedback Input Leakage Current
Amplifier Trandconductance
Driver Source Current
VFB3 = 0V, IFB3 = 0.5 to 5mA (source)
Error Amplifier
Feedback Voltage
Input Bias Current
Input Offset Voltage
Open Loop Gain
Unity Gain Bandwidth
Output Sink Current
Output Source Current
Slew Rate
Oscillator
Frequency Range
Frequency
CT Peak Voltage
RT = TBD
CT Valley Voltage
SYNC Input High Pulse Width
SYNC Rise/Fall Time
SYNC Frequency Range
SYNC High/Low Threshold
Min
0.49
-25
0.49
90
100
540
100
FOSC
PRELIMINARY
Typ Max Unit
0.5 0.51 V
µA
-2 mV
5 mA
0 25 mV
µA
-1.5 mV
5 mA
0.5 0.51 V
200 nA
5 mV
dB
3 MHz
2 mA
2 mA
1 V/µS
700 KHz
600 660 KHz
3.0 V
0.1 V
nS
50 nS
FOSC
±10%
kHz
1.5 V
2002 Semtech Corp.
3
www.semtech.com
3Pages 
SC2453
POWER MANAGEMENT
Pin Descriptions
PRELIMINARY
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Pin Name
ILIM1
FB1
EO1
BD4
FB4
SS/SHDN
SYNC
POK
OSC
FB3
BD3
EO2
FB2
ILIM2
AGND
AVCC
BST2
GD2H
PH2
GD2L
PGND
PVCC
GD1L
PH1
GD1H
BST1
VIN
BDI
Pin Function
Current limit threshold set for the OUTPUT1. An external resistor adjusts the limit.
Feedback input for OUTPUT1.
Error amplifier output for compensation of OUTPUT1.
Positive linear regulator base driver.
Feedback input for OUTPUT4.
Soft start pin. Hold low to shutdown part.
Oscillator synchronization pin.
Open drain power good output.
Connect a resistor to AGND for programming the oscillator frequency.
Feedback input for OUTPUT3.
Negative linear regulator base driver.
Error amplifier output for compensation of OUTPUT2.
Feedback input for OUTPUT2.
Current limit threshold set for OUTPUT2. An external resistor adjusts the limit.
Analog signal ground.
Supply voltage for analog circuitry.
Boost capacitor connection for the OUTPUT2 high side gate drive. Connect an external
capacitor and a diode as shown in the Typical Application Circuit.
Gate drive output for OUTPUT2. It is 180 degrees out of phase with GD1H.
Switching node for OUTPUT2 external inductor connection.
Gate drive output for OUTPUT2, low side N-Channel MOSFET.
Power ground.
Supply voltage for output drivers.
Gate drive output for OUTPUT1, low side N-Channel MOSFET.
Switching node for OUTPUT1 external inductor connection.
Gate drive output for OUTPUT1, high side N-Channel MOSFET.
Boost capacitor connection for the OUTPUT1 high side gate drive. Connect an external
capacitor and a diode as shown in the Typical Application Circuit.
Input supply voltage.
Base drive for AVCC/PVCC regulator.
2002 Semtech Corp.
6
www.semtech.com
6 Page | |||
| ページ | 合計 : 14 ページ | ||
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PDF ダウンロード | [ SC2453 datasheet.PDF ] | |
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SC2453 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。 また、SC2453のさまざまなアプリケーション回路とユースケースを使用して独自の設計に統合する方法を理解するのに役立ちます。 |
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