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參數(shù)資料
| 型號： | SC2447 |
| 廠商： | Semtech Corporation |
| 英文描述： | Dual-Phase, Single or Dual Output Synchronous Step-Down Controller |
| 中文描述： | 雙相，單或雙輸出同步降壓控制器 |
| 文件頁數(shù)： | 1/26頁 |
| 文件大小： | 711K |
| 代理商： | SC2447 |
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POWER MANAGEMENT
Description
The SC2447 is a versatile high-frequency dual phase PWM
step-down controller optimized for Philips and Renesas
DrMOS
TM
. Both phases are capable of sourcing or sink-
ing load currents, making the SC2447 suitable for net-
working system power and DDR applications.
1
www.semtech.com
SC2447
Dual-Phase, Single or Dual Output
Synchronous Step-Down Controller
REFOUT
GDH2
IN1-
SYNC
CS1+
COMP1
SS1/EN1
CS1-
SS2/EN2
COMP2
IN2-
REFIN
CS2-
CS2+
GDH1
GDL1
GDL2
REF
ROSC
AGND
AVCC
VDDG
CBN
CBP
VSSO
VSSC
DISABLE
VI
REG5V
VO
VDDO
VDDC
V
2.5V/20A
V
IN
12V
V
1.2V/25A
L
1
μ
H/1.8m
C
O1
100
μ
F
x 3
C
IN1
22
μ
F
x 4
C
SS1
0.1
μ
F
C
O2
100
μ
F
x 3
C
SS2
0.1
μ
F
R
OSC
, 51.1K
C
5
1
μ
F
C
3
1
μ
F
C
VCC
4.7
F
R
22.1K
R
22.1K
C
100nF
R
S1C
, 11K
PIP212-12M
R
FB1A
10K
R
FB1B
2.49K
R
24.9K
C
3.3nF
C
0.1uF
C
10pF
C
B1
100nF
R
1
10
R
VCC
10
L
0.4
μ
H/1m
C
6
1
μ
F
C
4
1
μ
F
R
S2B
200K
R
22.1K
C
68nF
R
S2C
, 20K
VDDG
CBN
CBP
VSSO
VSSC
DISABLE
VI
REG5V
VO
VDDO
VDDC
PIP212-12M
R
FB2A
10K
R
7.15K
R
A2
16.9K
C
A2
3.3nF
C
10pF
C
100nF
R
2
10
C
IN2
22
μ
F
x 4
SC2447
Revision: December 15, 2006
Features
2-Phase Step-down Controller optimized for Philips
or Renesas DrMOS
TM
Out of Phase Operation for Low Input Current Ripple
Outputs Source and Sink Current
Fixed Frequency Peak Current-Mode Control
Lossless Inductor DCR Current Sensing
Optional Resistor Current-Sensing for Precise Cur-
rent-Limit
Dual 30A Outputs or 2-Phase 60A Single Output
Operation
Wide Input Voltage Range: 4.65V to 15V
Individual Closed-Loop Soft-Start, Overload Shut-
down Timer and Enable
Output Voltage as Low as 0.5V
Starts into Pre-Bias Output
Tri-State PWM Output during Shutdown
Programmable Frequency Up to 1MHz Per Phase
External Synchronization
TSSOP-28 Lead-free Package. Fully WEEE and RoHS
Compliant
Typical Application Circuit
The SC2447 employs fixed frequency, continuous-con-
duction peak current-mode control for easy compensa-
tion and fast transient response.
The SC2447 can be used to generate two independent
outputs (up to 30A per output) or a single 60A output
with shared phase current. The PWM signals are 180°
out of phase to minimize input/output ripple.
Either inductor DC resistance or precision sense resistor
can be used for current-mode control. Inductor DC resis-
tance sensing has the advantage of being lossless.
Each phase has individual closed-loop soft-start and over-
load shutdown timer. The SC2447 powers up neatly with
pre-biased output. It has tri-state shutdown and hiccup
overload protection. In two-phase single-output configu-
ration, the master timer controls the soft-start and over-
load shutdown functions. The SC2447 is in a lead-free,
WEEE and RoHS compliant, TSSOP-28 package.
Applications
Telecommunication Power Supplies
DDR Memory Power Supplies
Graphic Power Supplies
Servers and Base Stations
Figure 1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC2447EVB | Dual-Phase, Single or Dual Output Synchronous Step-Down Controller |
| SC2447TSTRT | Dual-Phase, Single or Dual Output Synchronous Step-Down Controller |
| SC2449EVB | BI-Phase/Dual Controller |
| SC2449ISWTR | BI-Phase/Dual Controller |
| SC2449ISWTRT | BI-Phase/Dual Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC24-470-R | 功能描述:INDUCTOR SHIELD 47UH 150MA SMD RoHS:是 類別:電感器，線圈，扼流圈 >> 固定式 系列:SC24 標(biāo)準(zhǔn)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 |
| SC24-471-R | 功能描述:INDUCTOR SHIELD 470UH 50MA SMD RoHS:是 類別:電感器，線圈，扼流圈 >> 固定式 系列:SC24 標(biāo)準(zhǔn)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 |
| SC2447EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Dual-Phase, Single or Dual Output Synchronous Step-Down Controller |
| SC2447TSTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Dual-Phase, Single or Dual Output Synchronous Step-Down Controller |
| SC2449 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:BI PHASE DUAL CONTROLLER |
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