LTC3717EUH-1#TR datasheet, PDF

Datasheet> All Categories > Power/power management> The power supply circuit> LTC3717EUH-1#TR

LTC3717EUH-1#TR: DescriptionIC ctrlr step-down sync 32qfn; CategoryPower/power management The power supply circuit; File Size265KB，20 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC3717EUH-1#TR Overview

IC ctrlr step-down sync 32qfn

LTC3717EUH-1#TR Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	incompatible
Maker	Linear ( ADI )
Parts packaging code	QFN
package instruction	VQCCN, LCC32,.2SQ,20
Contacts	32
Manufacturer packaging code	UH
Reach Compliance Code	_compli
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER
control mode	CURRENT-MODE
Maximum input voltage	36 V
Minimum input voltage	4 V
Nominal input voltage	15 V
JESD-30 code	S-PQCC-N32
JESD-609 code	e0
length	5 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	32
Maximum operating temperature	70 °C
Minimum operating temperature
Maximum output current	2 A
Package body material	PLASTIC/EPOXY
encapsulated code	VQCCN
Encapsulate equivalent code	LCC32,.2SQ,20
Package shape	SQUARE
Package form	CHIP CARRIER, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	235
Certification status	Not Qualified
Maximum seat height	0.8 mm
surface mount	YES
Switch configuration	PUSH-PULL
Maximum switching frequency	1500 kHz
technology	CMOS
Temperature level	COMMERCIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	NO LEAD
Terminal pitch	0.5 mm
Terminal location	QUAD
Maximum time at peak reflow temperature	20
width	5 mm

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LTC3717-1

Wide Operating Range,

No R

SENSE

Step-Down Controller

for DDR/QDR Memory Termination

FEATURES

DESCRIPTIO

OUT

= 1/2 V

REF

Adjustable and Symmetrical Sink/Source

Current Limit up to 20A

True Current Mode Control with Optional Use of

Sense Resistor

and I

Pins Allow Constant Frequency

Operation During Input and Output Voltage Changes

±0.65%

Output Voltage Accuracy

Up to 97% Efficiency

Ultrafast Transient Response

2% to 90% Duty Cycle at 200kHz

ON(MIN)

≤

100ns

Stable with Ceramic C

OUT

Power Good Output Voltage Monitor

Wide V

Range: 4V to 36V

Adjustable Switching Frequency up to 1.5MHz

Output Overvoltage Protection

Optional Short-Circuit Shutdown Timer

Available in a 5mm

5mm QFN Package

The LTC

3717-1 is a synchronous step-down switching

regulator controller for double data rate (DDR) and Quad

Data Rate

(QDR

) memory termination. The controller

uses a valley current control architecture to deliver very

low duty cycles with or without a sense resistor. Operating

frequency is selected by an external resistor and is com-

pensated for variations in V

and V

OUT

Forced continuous operation reduces noise and RF inter-

ference. Output voltage is internally set to half of V

REF

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

input.

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

No R

SENSE

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.

APPLICATIO S

Bus Termination: DDR and QDR Memory, SSTL,

HSTL, ...

Notebook Computers, Desktop Servers

Tracking/Margining Power Supply

TYPICAL APPLICATIO

5V TO 28V

1µF

0.1µF

REF

RUN/SS

LTC3717-1

SENSE

BOOST

SGND

PGOOD

DRV

INTV

715k

= 2.5V

Si7840DP

B320A

2.5V TO 5.5V

150µF

6.3V

×2

EFFICIENCY (%)

100

= 5V

= 2.5V

470pF

20k

0.22µF

CMDSH-3

Si7840DP

4.7µF

0.68µH

OUT

1.25V

180µF

±10A

×2

B320A

PGND

SENSE

–

37171 F01a

Figure 1. High Efficiency DDR Memory Termination Supply

Efficiency vs Load Current

OUT

= 1.25V

LOAD CURRENT (A)

37171 F01b

sn37171 37171fs

LTC3717EUH-1#TR Related Products

	LTC3717EUH-1#TR	LTC3717EUH-1#PBF	LTC3717EUH-1#TRPBF
Description	IC ctrlr step-down sync 32qfn	IC CTRLR STEP-DOWN SYNC 32QFN	IC CTRLR STEP-DOWN SYNC 32QFN
Brand Name	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	incompatible	conform to	conform to
Maker	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
Parts packaging code	QFN	QFN	QFN
package instruction	VQCCN, LCC32,.2SQ,20	VQCCN, LCC32,.2SQ,20	VQCCN, LCC32,.2SQ,20
Contacts	32	32	32
Manufacturer packaging code	UH	UH	UH
Reach Compliance Code	_compli	compliant	compliant
ECCN code	EAR99	EAR99	EAR99
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER
control mode	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Maximum input voltage	36 V	36 V	36 V
Minimum input voltage	4 V	4 V	4 V
Nominal input voltage	15 V	15 V	15 V
JESD-30 code	S-PQCC-N32	S-PQCC-N32	S-PQCC-N32
JESD-609 code	e0	e3	e3
length	5 mm	5 mm	5 mm
Humidity sensitivity level	1	1	1
Number of functions	1	1	1
Number of terminals	32	32	32
Maximum operating temperature	70 °C	70 °C	70 °C
Maximum output current	2 A	2 A	2 A
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	VQCCN	VQCCN	VQCCN
Encapsulate equivalent code	LCC32,.2SQ,20	LCC32,.2SQ,20	LCC32,.2SQ,20
Package shape	SQUARE	SQUARE	SQUARE
Package form	CHIP CARRIER, VERY THIN PROFILE	CHIP CARRIER, VERY THIN PROFILE	CHIP CARRIER, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	235	260	250
Certification status	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	0.8 mm	0.8 mm	0.8 mm
surface mount	YES	YES	YES
Switch configuration	PUSH-PULL	PUSH-PULL	PUSH-PULL
Maximum switching frequency	1500 kHz	1500 kHz	1500 kHz
technology	CMOS	CMOS	CMOS
Temperature level	COMMERCIAL	COMMERCIAL	COMMERCIAL
Terminal surface	Tin/Lead (Sn/Pb)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	NO LEAD	NO LEAD	NO LEAD
Terminal pitch	0.5 mm	0.5 mm	0.5 mm
Terminal location	QUAD	QUAD	QUAD
Maximum time at peak reflow temperature	20	30	NOT SPECIFIED
width	5 mm	5 mm	5 mm

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