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參數資料
| 型號： | SC2443MLTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Dual-Phase Single or Two 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： | 1/20頁 |
| 文件大小： | 920K |
| 代理商： | SC2443MLTRT |
Dual-Phase Single or Two Output
Synchronous Step-Down Controller
SC2443
POWER MANAGEMENT
Features
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Wide input voltage range: 4.7V to 6V
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0.5V feedback voltage for low-voltage outputs
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Programmable frequency up to MHz per phase
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2-Phase synchronous continuous conduction mode for
high efficiency step-down converters
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Out-of-phase operation for low input current ripples
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Output source and sink currents
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Fixed frequency peak current-mode control
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75mV/-0mV maximum current sense voltage
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Inductor DCR current-sensing for low-cost applications
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Dual outputs or 2-phase single output operation
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Excellent current sharing between individual phases
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Individual soft-start, overload shutdown and enable
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External reference input for DDR applications
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External synchronization
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Industrial temperature range
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4mm X 4mm Xmm 24-lead MLPQ package
July 09 2007
Typical Application Circuit
Description
The SC2443 is a high-frequency dual synchronous step-down
switching power supply controller. It provides out-of-phase
high-current output gate drives to all N-channel MOSFET power
stages. The SC2443 operates in synchronous continuous-con-
duction mode. Both phases are capable of maintaining regula-
tion with sourcing or sinking load currents, making the SC2443
suitable for generating both VDDQ and the tracking VTT for
DDR applications.
The SC2443 employs fixed frequency peak current-mode con-
trol for the ease of frequency compensation and fast transient
response.
The dual-phase step-down controllers of the SC2443 can be
used to produce two individually controlled and regulated out-
puts or a single output with shared current in each phase. The
Step-down controllers operate from an input of at least 4.7V
and are capable of regulating outputs as low as 0.5V
Individual soft-start and overload shutdown timer is included
in each step-down controller. The SC2443 implements hiccup
overload protection. In single output current share configura-
tion, the master timer controls the soft-start and overload shut-
down functions of both controllers.
Applications
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Telecommunication power supplies
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DDR memory power supplies
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Graphic power supplies
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Servers and base stations
VOUT1
IN2-
VP1
VIN
VIN
VOUT1
IN2-
VP1
VIN
IN1-
U1
SC2443
1
2
3
4
5
6
7
8
9
1
1
1
13
14
15
16
17
18
1
2
2
2
2
2
IN1-
COMP1
SYNC
AGND
REF
REFIN
C
I
C
C
S
A
BST2
GDH2
GDL2
PGND
PVCC
GDL1
G
B
S
C
C
R
IN1-
VOUT2
VIN
VP1
IN1-
VP1
VIN
VIN
VIN
U1
SC2443
1
2
3
4
5
6
7
8
9
1
1
1
13
14
15
16
17
18
1
2
2
2
2
2
IN1-
COMP1
SYNC
AGND
REF
REFIN
C
I
C
C
S
A
BST2
GDH2
GDL2
PGND
PVCC
GDL1
G
B
S
C
C
R
VOUT1
VIN
IN1-
VOUT1
Dual Independent Outputs
Single Output With Current Sharing
相關PDF資料 |
PDF描述 |
|---|---|
| SC2446A | Dual-Phase, Single or Dual Output Synchronous Step-Down Controller |
| SC2446AEVB | Dual-Phase, Single or Dual Output Synchronous Step-Down Controller |
| SC2446AITSTRT | Dual-Phase, Single or Dual Output Synchronous Step-Down Controller |
| SC2446EVB | Dual-Phase Single or Two Output Synchronous Step-Down Controllers |
| SC2446ITETRT | Dual-Phase Single or Two Output Synchronous Step-Down Controllers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SC2446 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Dual-Phase Single or Two Output Synchronous Step-Down Controllers |
| SC2446A | 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 |
| SC2446AEVB | 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 |
| SC2446AITSTRT | 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 |
| SC2446EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Dual-Phase Single or Two Output Synchronous Step-Down Controllers |
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