LTC3717 datasheet(1/20 Pages) LINER

部件名	LTC3717

功能描述	Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination

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制造商	LINER [Linear Technology]

网页	http://www.linear.com

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LTC3717

sn3717 3717fs

Wide Operating Range,

No RSENSE

TM Step-Down Controller

for DDR/QDR Memory Termination

s

VOUT = 1/2 VIN (Supply Splitter)

s

Adjustable and Symmetrical Sink/Source

Current Limit up to 20A

s

±0.65% Output Voltage Accuracy

s

Up to 97% Efficiency

s

No Sense Resistor Required

s

Ultrafast Transient Response

s

True Current Mode Control

s

2% to 90% Duty Cycle at 200kHz

s

tON(MIN) ≤ 100ns

s

Stable with Ceramic COUT

s

Dual N-Channel MOSFET Synchronous Drive

s

Power Good Output Voltage Monitor

s

Wide VCC Range: 4V to 36V

s

Adjustable Switching Frequency up to 1.5MHz

s

Output Overvoltage Protection

s

Optional Short-Circuit Shutdown Timer

s

Available in a 16-Pin Narrow SSOP Package

s

Bus Termination: DDR and QDR Memory, SSTL,

HSTL, ...

s

Notebook Computers, Desktop Servers

s

Tracking Power Supply

The LTC

®3717 is a synchronous step-down switching

regulator controller for double data rate (DDR) and Quad

Data Rate

TM (QDRTM) memory termination. The controller

uses a valley current control architecture to deliver very

low duty cycles without requiring a sense resistor. Oper-

ating frequency is selected by an external resistor and is

compensated for variations in VIN.

Forced continuous operation reduces noise and RF inter-

ference. Output voltage is internally set to half of VREF,

which is user programmable.

Fault protection is provided by an output overvoltage

comparator and optional short-circuit shutdown timer.

Soft-start capability for supply sequencing is accom-

plished using an external timing capacitor. The regulator

current limit level is symmetrical and user programmable.

Wide supply range allows operation from 4V to 36V at the

VCC input.

, LTC and LT are registered trademarks of Linear Technology Corporation.

No RSENSE is a trademark of Linear Technology Corporation.

QDR RAMs and Quad Data Rate RAMs comprise a new family of products developed by Cypress

Semiconductor, Hitachi, IDT, Micron Technology, Inc. and Samsung.

Figure 1. High Efficiency DDR Memory Termination Supply

Efficiency vs Load Current

+

DB

CMDSH-3

D1

B320A

L1

0.68

µH

CVCC

4.7

µF

CIN

150

µF

6.3V

×2

VIN

2.5V TO 5.5V

VOUT

1.25V

±10A

+

COUT

180

µF

4V

×2

M2

Si7840DP

3717 F01a

M1

Si7840DP

RON

715k

CSS

0.1

µF

ION

VREF

TG

SW

BOOST

RUN/SS

ITH

SGND

INTVCC

BG

PGND

VFB

PGOOD

CB 0.22µF

RC

20k

LTC3717

CC

470pF

1

µF

VCC

5V TO 28V

D2

B320A

VDD = 2.5V

LOAD CURRENT (A)

0

3717 F01b

100

90

80

70

60

50

40

30

20

10

0

2

4

6

8

10

12

14

VIN = 2.5V

VIN = 5V

VOUT = 1.25V

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO

类似零件编号 - LTC3717

制造商	部件名	数据表	功能描述
Linear Technology	LTC3717	1Mb / 28P	Ultrathin, Triple Output, Step-Down 關Module Regulator for DDR-QDR4 Memory
	LTC3717-1	268Kb / 20P	Wide Operating Range, No RSENSE TM Step-Down Controller for DDR/QDR Memory Termination
	LTC3717-1	278Kb / 20P	Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination
	LTC3717EUH-1	268Kb / 20P	Wide Operating Range, No RSENSE TM Step-Down Controller for DDR/QDR Memory Termination
	LTC3717	266Kb / 20P	Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination

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类似说明 - LTC3717

制造商	部件名	数据表	功能描述
Linear Technology	LTC3717	266Kb / 20P	Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination
	LTC3717-1	278Kb / 20P	Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination
	LTC3717-1	268Kb / 20P	Wide Operating Range, No RSENSE TM Step-Down Controller for DDR/QDR Memory Termination
	LTC1778EGN	254Kb / 24P	Wide Operating Range, No RSENSE Step-Down Controller
	LTC1778	272Kb / 24P	Wide Operating Range, No RSENSE Step-Down Controller
	LTC1778-1	272Kb / 24P	Wide Operating Range, No RSENSE Step-Down Controller
	LTC3778	297Kb / 24P	Wide Operating Range, No RSENSE Step-Down Controller
	LTC3778	310Kb / 24P	Wide Operating Range, No RSENSE Step-Down Controller
	LTC1778	303Kb / 24P	Wide Operating Range, No RSENSE TM Step-Down Controller REV A
	LTC3879	312Kb / 28P	Fast, Wide Operating Range No RSENSE Step-Down Controller

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LTC3717 数据表(PDF) 1 Page - Linear Technology

LTC3717 数据表(HTML) 1 Page - Linear Technology

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类似零件编号 - LTC3717

类似说明 - LTC3717

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