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參數資料
| 型號： | SC2453_05 |
| 廠商： | Semtech Corporation |
| 英文描述： | High Performance Quad Output Switching Regulator |
| 中文描述： | 高性能四路輸出開關穩壓器 |
| 文件頁數： | 1/22頁 |
| 文件大小： | 428K |
| 代理商： | SC2453_05 |
1
www.semtech.com
SC2453
High Performance Quad Output
Switching Regulator
POWER MANAGEMENT
Description
Revision: July 20, 2005
Features
Two synchronized converters for low noise
Power up sequencing to prevent latch-up
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
negative linear regulator
Output voltage as low as 0.5V
Small package TSSOP-28. Also offered in lead free,
WEEE and RoHS compliant package
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
Typical Application Circuit
The SC2453 is a high performance controller for multi-
output converters that can be configured for a wide vari-
ety of applications. The SC2453 utilizes PWM synchro-
nous buck topologies where efficiency is most important.
It also provides dedicated programmable positive and
negative linear regulators using external transistors. Each
of the three positive outputs is adjustable down to 0.5V.
The two PWM switchers are synchronized 180° out of
phase reducing input ripple, allowing for fewer input ca-
pacitors. Power up sequencing prevents converter latch-
up.
The SC2453 can be synchronized to other converters to
prevent beat frequencies. The wide range programmable
operating frequency allows users to optimize a converter
design. The PWM switchers sense the voltage across the
low-side MOSFETs on-resistance to efficiently provide
adjustable current-limit, eliminating costly current-sense
resistors. A POK signal is issued when soft-start is com-
plete on both PWM switchers and their outputs are within
10% of the set point.
R8
C8
R14
R16
C1
R18
C5
C7
D1
Q1
C12
C3
R6
R5
C14
L2
C2
R17
Q4
D3
R11
C13
R7
Q6
C20
C10
C16
C15
C18
R4
C11
C19
C6
C17
C9
Q3
R3
Vout2: +3.3V
Vout1: +5V
Vout3: -12V
Vout4: +2.5V
R1
(as low as 0.5V)
(as low as 0.5V)
Vin: 4.5 - 30V
To Vout2
To Vout2
Q7
R9
Q5
D2
L1
R10
Q2
GD1L
23
PH1
24
GD1H
25
EO2
12
BST1
26
POK
8
SYNC
7
A
1
EO1
3
GD2L
20
FB1
2
BD4
4
FB2
13
PH2
19
GD2H
18
BST2
17
FB4
5
B
2
I
1
V
2
P
2
I
1
BD3
11
FB3
10
P
2
A
1
SS/SHDN
6
OSC
9
SC2453
R12
R15
R13
C4
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相關代理商/技術參數 |
參數描述 |
|---|---|
| SC2453ITSTR | 制造商:Semtech Corporation 功能描述:DC DC Cntrlr Quad-OUT Synchronous Buck Controller/PWM DC to DC Controller 4.5V to 30V Input 28-Pin TSSOP T/R 制造商:Semtech Corporation 功能描述:IC, QUAD SWITCHING REGULATOR, 28-TSSOP; Primary Input Voltage:30V; No. of Outputs:4; Output Voltage:27V; No. of Pins:28; Operating Temperature Min:-35C; Operating Temperature Max:105C; Filter Terminals:Surface Mount ;RoHS Compliant: No |
| SC2453ITSTRT | 制造商:Semtech Corporation 功能描述:DC DC Cntrlr Quad-OUT Synchronous Buck Controller/PWM DC to DC Controller 4.5V to 30V Input 28-Pin TSSOP T/R 制造商:Semtech Corporation 功能描述:IC QUAD SWITCHING REGULATOR 28-TSSOP 制造商:Semtech Corporation 功能描述:SC Series 4.5 to 30 V 700 kHz High Performance Switching Regulator - TSSOP-28 |
| SC24-561-R | 功能描述:INDUCTOR SHIELD 560UH 50MA SMD RoHS:是 類別:電感器，線圈，扼流圈 >> 固定式 系列:SC24 標準包裝:500 系列:1331 電感:1.2µH 電流:247mA 電流 - 飽和:247mA 電流 - 溫升:- 類型:鐵芯體 容差:±10% 屏蔽:屏蔽 DC 電阻(DCR):最大 730 毫歐 Q因子@頻率:40 @ 7.9MHz 頻率 - 自諧振:130MHz 材料 - 芯體:鐵 封裝/外殼:0.312" L x 0.115" W x 0.135" H（7.94mm x 2.92mm x 3.43mm） 安裝類型:表面貼裝 包裝:帶卷 (TR) 工作溫度:-55°C ~ 105°C 頻率 - 測試:7.9MHz |
| SC245B1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:TRIAC|200V V(DRM)|10A I(T)RMS|TO-208AA |
| SC245B4 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:TRIAC|200V V(DRM)|10A I(T)RMS|FBASE-R-HW30 |
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