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SC2446AITSTRT

更新时间： 2024-10-01 04:05:27

品牌	Logo	应用领域
商升特 - SEMTECH		稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数	文件大小	规格书
27页	525K
描述
Dual-Phase, Single or Dual Output Synchronous Step-Down Controller

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SC2446AITSTRT 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	TSSOP
包装说明：	ROHS COMPLIANT, MO-153AE, TSSOP-28	针数：	28
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.81
Is Samacsys：	N	模拟集成电路 - 其他类型：	DUAL SWITCHING CONTROLLER
控制模式：	CURRENT-MODE	控制技术：	PULSE WIDTH MODULATION
最大输入电压：	16 V	最小输入电压：	4.7 V
标称输入电压：	12 V	JESD-30 代码：	R-PDSO-G28
JESD-609代码：	e3	长度：	9.7 mm
功能数量：	1	端子数量：	28
最高工作温度：	125 °C	最低工作温度：	-40 °C
最大输出电流：	0.005 A	封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP	封装等效代码：	TSSOP28,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	NOT SPECIFIED	认证状态：	Not Qualified
座面最大高度：	1.2 mm	子类别：	Switching Regulator or Controllers
表面贴装：	YES	切换器配置：	PUSH-PULL
最大切换频率：	1000 kHz	温度等级：	AUTOMOTIVE
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	0.65 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	4.4 mm
Base Number Matches：	1

SC2446AITSTRT 数据手册

SC2446A

Dual-Phase, Single or Dual Output

Synchronous Step-Down Controller

POWER MANAGEMENT

Features

Description

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

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_DDQand the tracking V_TTfor 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_DCvoltage 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.

Industrial temperature range

28-lead TSSOP lead free package. This product is

fully WEEE and RoHS compliant

Applications

Telecommunication power supplies

DDR memory power supplies

Graphic power supplies

Servers and base stations

Typical Application Circuit

V IN (12V)

VING ND

R55

R49

PVCC

BST2

GDH2

VO1

U10

VO2

VDDC

BST1

C68

C67

VDDO

GDH1

C23

C45

R53

C65

R52

C62

R46

C74

R14

C75

GD L1

PGND

VPN 1

CS1+

CS1-

GD L2

VSSO

VSSC

VSSO

R13

VPN 2

CS2+

R50

Integrated M O SFET/D river

RCS-5

RCS-6

CS2-

VO2GND

VO1GND

IN1-

IN2-

COMP1

RE F

COMP2

RE FIN

VIN 2

R28

REFOUT (0. 5V)

R48

R29

C40

AGND

Rosc

AVCC

C63

R45

C29

R51

SYNC

SS1/EN1

TP11

R47

C64

C70

VIN

REFOUT SS2/EN2

C72

C73

C71

SC2446A

REFOUT (0. 5V)

Figure 1

www.semtech.com

Revision: November 9, 2005

12 3 4 5 6 7...27

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与SC2446AITSTRT相关器件

型号	品牌	获取价格	描述	数据表
SC2446EVB	SEMTECH	获取价格	Dual-Phase Single or Two Output Synchronous Step-Down Controllers
SC2446ITETRT	SEMTECH	获取价格	Dual-Phase Single or Two Output Synchronous Step-Down Controllers
SC2446ITSTR	SEMTECH	获取价格	Dual Switching Controller, Current-mode, 3A, 1000kHz Switching Freq-Max, PDSO28, MO-153-AE
SC2446ITSTRT	SEMTECH	获取价格	Dual Switching Controller, Current-mode, 3A, 1000kHz Switching Freq-Max, PDSO28, LEAD FREE
SC2447	SEMTECH	获取价格	Dual-Phase, Single or Dual Output Synchronous Step-Down Controller
SC2447EVB	SEMTECH	获取价格	Dual-Phase, Single or Dual Output Synchronous Step-Down Controller
SC2447TSTRT	SEMTECH	获取价格	Dual-Phase, Single or Dual Output Synchronous Step-Down Controller
SC2449	SEMTECH	获取价格	BI PHASE DUAL CONTROLLER
SC2449_07	SEMTECH	获取价格	BI-Phase/Dual Controller
SC2449EVB	SEMTECH	获取价格	BI-Phase/Dual Controller

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