Datasheet > 电源电路 > 开关式稳压器或控制器> SC2446EVB

SC2446EVB

更新时间： 2024-10-01 04:05:27

品牌	Logo	应用领域
商升特 - SEMTECH		控制器
页数	文件大小	规格书
38页	799K
描述
Dual-Phase Single or Two Output Synchronous Step-Down Controllers

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SC2446EVB 数据手册

SC2446

Dual-Phase Single or Two Output

Synchronous Step-Down Controllers

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

75mV/-110mV maximum current sense voltage

Synthesized MOSFET R_DS(ON)current-sensing for

low-cost applications

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_DDQand the tracking V_TTfor 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.

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

Typical Application Circuit

VIN

C92

D11

D12

PVCC

Q21

Q22

BST2

BST1

R73

R74

GDH2

GDH1

VO2

VO1

L11

C93

C94

L12

C99

C95

Q23

Q24

C98

C100

CFILTER

RFILTER

R77

R78

CFILTER

RFILTER

GDL2

GDL1

PGND

VPN1

CS1+

C96

R75

R76

C97

R79

R81

R80

R82

VPN2

RCS+

CS2+

RCS-

CS2-

CS1-

IN2-

IN1-

C101

C103

C102

C105

COMP2

REFIN

VIN2

COMP1

REF

R83

REF

VIN

C104

R84

AGND

Rosc

SYNC

R85

SYNC

SS1/EN1

SS2/EN2

VIN

AVCC

REFOUT

C106

C107

C108

C109

SC2446

Figure 1

Dual Independant Outputs

U.S. Patent No. 6,441,597, www.semtech.com

Revision: September 9, 2004

12 3 4 5 6 7...38

中文翻译

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与SC2446EVB相关器件

型号	品牌	获取价格	描述	数据表
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
SC2449ISWTR	SEMTECH	获取价格	BI-Phase/Dual Controller

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