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參數資料
| 型號： | SC2446A |
| 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： | 1/27頁 |
| 文件大小： | 538K |
| 代理商： | SC2446A |
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POWER MANAGEMENT
Description
The SC2446A is a high-frequency dual synchronous step-
down switching power supply controller. It provides out-
of-phase output gate signals. The SC2446A operates in
synchronous continuous-conduction mode. Both phases
are capable of maintaining regulation with sourcing or
sinking load currents, making the SC2446A suitable for
generating both V
DDQ
and the tracking V
TT
for DDR appli-
cations.
The SC2446A employs fixed frequency peak current-
mode control for the ease of frequency compensation
and fast transient response.
The dual-phase step-down controllers of the SC2446A
can be configured to provide two individually controlled
and regulated outputs or a single output with shared
current in each phase. The Step-down controllers oper-
ate from an input of at least 4.7V and are capable of
regulating outputs as low as 0.5V
The step-down controllers in the SC2446A have the pro-
vision to sense inductor R
voltage drop for current-mode
control. This sensing scheme eliminates the need of the
current-sense resistor and is more noise-immune than
direct sensing of the high-side or the low-side MOSFET
voltage. Precise current-sensing with sense resistor is
optional.
Individual soft-start and overload shutdown timer is in-
cluded in each step-down controller. The SC2446A imple-
ments hiccup overload protection. In two-phase single-
output configuration, the master timer controls the soft-
start and overload shutdown functions of both control-
lers.
1
www.semtech.com
SC2446A
Dual-Phase, Single or Dual Output
Synchronous Step-Down Controller
Revision: November 9, 2005
Features
2-Phase synchronous continuous conduction mode
for high efficiency step-down converters
Out of phase operation for low input current ripples
Output source and sink currents
Fixed frequency peak current-mode control
50mV/-75mV maximum current sense voltage
Inductive current-sensing for low-cost applications
Optional resistor current-sensing for precise cur-
rent-limit
Dual outputs or 2-phase single output operation
Excellent current sharing between individual phases
Wide input voltage range: 4.7V to 16V
Individual soft-start, overload shutdown and enable
Duty cycle up to 88%
0.5V feedback voltage for low-voltage outputs
External reference input for DDR applications
Programmable frequency up to 1MHz per phase
External synchronization
Industrial temperature range
28-lead TSSOP lead free package. This product is
fully WEEE and RoHS compliant
Typical Application Circuit
Applications
Telecommunication power supplies
DDR memory power supplies
Graphic power supplies
Servers and base stations
Figure 1
L5
VO1GND
R13
R28
R29
C40
C29
13
9
16
11
1
10
28
VDDC
VSSC
VI
CB
VDDO
VO
VSSO
U9
Integrated M O S FE T/D river
V IN (12V )
VO2GND
R45
VO2
C23
RCS-5
C45
R14
RCS-6
C62
R46
R47
VIN
REFOUT (0.5V)
REFOUT (0.5V)
REFOUT (0.5V)
C63
R48
C64
R49
C65
R50
R51
C67
C68
R52
0
13
9
16
11
1
10
28
VDDC
VSSC
VI
CB
VDDO
VO
VSSO
U10
Integrated M O S FE T/D river
TP11
R53
0
R55
C6
C7
VO1
C70
L6
REFOUT
9
PGND
22
GDH2
20
BST2
19
IN1-
4
VPN1
27
SYNC
6
CS1+
1
PVCC
23
COMP1
5
SS1/EN1
28
CS1-
2
SS2/EN2
15
COMP2
11
IN2-
12
REFIN
10
CS2-
13
CS2+
14
VPN2
18
VIN2
17
BST1
26
GDH1
25
GDL1
24
GDL2
21
REF
8
Rosc
3
AGND
7
AVCC
16
U3
SC2446A
C71
C72
C73
C74
V IN G N D
C75
相關PDF資料 |
PDF描述 |
|---|---|
| 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 |
| SC2446 | Dual-Phase Single or Two Output Synchronous Step-Down Controllers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 |
| SC2446ITE.TRT | 制造商:Semtech Corporation 功能描述: |
| SC2446ITETRT | 功能描述:IC SYNC STEP DOWN CTRLR 28-TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - 專用型 系列:- 標準包裝:2,000 系列:- 應用:控制器，DSP 輸入電壓:4.5 V ~ 25 V 輸出數:2 輸出電壓:最低可調至 1.2V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:30-TFSOP（0.173"，4.40mm 寬） 供應商設備封裝:30-TSSOP 包裝:帶卷 (TR) |
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