SC2446AEVB datasheet(1/27 Pages) SEMTECH

номер детали	SC2446AEVB

подробное описание детали	Dual-Phase, Single or Dual Output Synchronous Step-Down Controller

PDF	27 Pages

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производитель	SEMTECH [Semtech Corporation]

домашняя страница	http://www.semtech.com

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SC2446A

Dual-Phase, Single or Dual Output

Synchronous Step-Down Controller

Description

Revision: November 9, 2005

Features

Typical Application Circuit

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 VTT 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

DC 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.

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

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

Integra ted M O SF ET /Drive r

VIN (1 2 V )

VO2GND

R45

VO2

C23

RCS-5

C45

R14

RCS-6

C62

R46

R47

VIN

REF OUT (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

Integra ted M O SF ET /Drive r

TP11

R53

0

R55

C6

C7

VO1

C70

L6

REFOU T

9

PGND

22

GDH2

20

BST2

19

IN1-

4

VPN 1

27

SYNC

6

CS1+

1

PVCC

23

COMP1

5

SS1/EN 1

28

CS1-

2

SS2/EN 2

15

COMP2

11

IN2-

12

REFIN

10

CS2-

13

CS2+

14

VPN 2

18

VIN 2

17

BST1

26

GDH1

25

GDL1

24

GDL2

21

REF

8

Rosc

3

AGND

7

AVCC

16

U3

SC2446A

C71

C72

C73

C74

VIN G ND

C75

Аналогичный номер детали - SC2446AEVB

производитель	номер детали	датащи	подробное описание детали
Semtech Corporation	SC2446	803Kb / 38P	Dual-Phase Single or Two Output Synchronous Step-Down Controllers
	SC2446EVB	803Kb / 38P	Dual-Phase Single or Two Output Synchronous Step-Down Controllers
	SC2446ITETRT	803Kb / 38P	Dual-Phase Single or Two Output Synchronous Step-Down Controllers

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Аналогичное описание - SC2446AEVB

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International Rectifier	IR3623MPBF	542Kb / 26P	HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING
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Semtech Corporation	SC2446	803Kb / 38P	Dual-Phase Single or Two Output Synchronous Step-Down Controllers
Semtech Corporation	SC2447	755Kb / 26P	Dual-Phase, Single or Dual Output Synchronous Step-Down Controller
International Rectifier	IR3622AMPBF	675Kb / 33P	HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING
Semtech Corporation	SC2443	1Mb / 20P	Dual-Phase Single or Two Output Synchronous Step-Down Controller
Semtech Corporation	SC2443	1Mb / 22P	Dual-Phase Single or Two Output Synchronous Step-Down Controller
International Rectifier	IR3623MPBF	515Kb / 26P	HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING
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More results

SC2446AEVB датащи(PDF) 1 Page - Semtech Corporation

SC2446AEVB датащи(HTML) 1 Page - Semtech Corporation

Аналогичный номер детали - SC2446AEVB

Аналогичное описание - SC2446AEVB

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