参数资料
| 型号： | SC2446ITETRT |
| 厂商： | Semtech |
| 文件页数： | 1/38页 |
| 文件大小： | 0K |
| 描述： | IC SYNC STEP DOWN CTRLR 28-TSSOP |
| 标准包装： | 1 |
| 应用： | 控制器，DDR |
| 输入电压： | 4.7 V ~ 16 V |
| 输出数： | 2 |
| 输出电压： | 可调至 0.5V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 标准包装 |
| 产品目录页面： | 1358 (CN2011-ZH PDF) |
| 其它名称： | SC2446ITEDKR |
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SC2446
Dual-Phase Single or Two Output
Synchronous Step-Down Controllers
POWER MANAGEMENT
Description
The SC2446 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-chan-
nel MOSFET power stages. The SC2446 operates in syn-
chronous continuous-conduction mode. Both phases are
capable of maintaining regulation with sourcing or sink-
ing load currents, making the SC2446 suitable for gen-
erating both V DDQ and the tracking V TT for DDR applica-
tions.
The SC2446 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 SC2446 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 operate from an
input of at least 4.7V and are capable of regulating out-
puts as low as 0.5V
The step-down controllers in the SC2446 have the pro-
vision to sense a synthesized MOSFET R DS(ON) for cur-
rent-mode control. This sensing scheme (U.S. patent
6,441,597) eliminates the need of the current-sense re-
sistor and is more noise-immune than direct sensing of
the high-side or the low-side MOSFET voltage. Precise cur-
rent-sensing with sense resistor is optional.
Individual soft-start and overload shutdown timer is in-
cluded in each step-down controller. The SC2446 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.
Typical Application Circuit
VIN
C92
D11
PVCC
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
75mV/-110mV maximum current sense voltage
Synthesized MOSFET R DS(ON) current-sensing for
low-cost applications
Optional resistor current-sensing for precise current-
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
Buffered V DDQ /2 output
Programmable frequency up to 1 MHz per phase
External synchronization
Industrial temperature range
28-lead TSSOP - EDP package
Applications
Telecommunication power supplies
DDR memory power supplies
Graphic power supplies
Servers and base stations
D12
VO2
L11
Q21
R73
C93
BST2
GDH2
BST1
GDH1
C94
R74
Q22
L12
VO1
C99
+
C95
R79
C96
R75
CFILTER
RFILTER
Q23
R77
GDL2
GDL1
PGND
R78
Q24
CFILTER
RFILTER
R76
C97
R80
C98
+
C100
RCS+
VPN2
CS2+
VPN1
CS1+
RCS+
R81
RCS-
CS2-
CS1-
RCS-
R82
IN2-
IN1-
C101
COMP2
COMP1
C102
R83
C103
REF
REFIN
REF
C104
C105
R84
VIN
VIN2
AGND
SYNC
SYNC
SS1/EN1
SS2/EN2
Rosc
AVCC
REFOUT
R85
VIN
Figure 1
Revision: September 9, 2004
C106 C107 C108
U1
SC2446
Dual Independant Outputs
1
C109
U.S. Patent No. 6,441,597, www.semtech.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC2446ITSTRT | 制造商:Semtech Corporation 功能描述:Controller IC 制造商:Semtech Corporation 功能描述:SC Series 4.7 to 16 V 1 MHz Dual-Phase Synchronous Step-Down Controller TSSOP-28 |
| SC2447 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Dual-Phase, Single or Dual Output Synchronous Step-Down Controller |
| SC24-470-R | 功能描述:INDUCTOR SHIELD 47UH 150MA SMD RoHS:是 类别:电感器，线圈，扼流圈 >> 固定式 系列:SC24 标准包装:500 系列:1331 电感:1.2µH 电流:247mA 电流 - 饱和:247mA 电流 - 温升:- 类型:铁芯体 容差:±10% 屏蔽:屏蔽 DC 电阻(DCR):最大 730 毫欧 Q因子@频率:40 @ 7.9MHz 频率 - 自谐振:130MHz 材料 - 芯体:铁 封装/外壳:0.312" L x 0.115" W x 0.135" H（7.94mm x 2.92mm x 3.43mm） 安装类型:表面贴装 包装:带卷 (TR) 工作温度:-55°C ~ 105°C 频率 - 测试:7.9MHz |
| SC24-471-R | 功能描述:INDUCTOR SHIELD 470UH 50MA SMD RoHS:是 类别:电感器，线圈，扼流圈 >> 固定式 系列:SC24 标准包装:500 系列:1331 电感:1.2µH 电流:247mA 电流 - 饱和:247mA 电流 - 温升:- 类型:铁芯体 容差:±10% 屏蔽:屏蔽 DC 电阻(DCR):最大 730 毫欧 Q因子@频率:40 @ 7.9MHz 频率 - 自谐振:130MHz 材料 - 芯体:铁 封装/外壳:0.312" L x 0.115" W x 0.135" H（7.94mm x 2.92mm x 3.43mm） 安装类型:表面贴装 包装:带卷 (TR) 工作温度:-55°C ~ 105°C 频率 - 测试:7.9MHz |
| SC2447EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Dual-Phase, Single or Dual Output Synchronous Step-Down Controller |
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