LTC3831IGN#TRPBF datasheet, PDF

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LTC3831IGN#TRPBF: DescriptionIC SW REG CONTROLLR SYNC 16-SSOP; CategoryPower/power management The power supply circuit; File Size205KB，20 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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LTC3831IGN#TRPBF Overview

IC SW REG CONTROLLR SYNC 16-SSOP

LTC3831IGN#TRPBF Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	conform to
Maker	Linear ( ADI )
Parts packaging code	SSOP
package instruction	SSOP, SSOP16,.25
Contacts	16
Manufacturer packaging code	GN
Reach Compliance Code	compliant
ECCN code	EAR99
Is Samacsys	N
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER
control mode	VOLTAGE-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	8 V
Minimum input voltage	3 V
Nominal input voltage	5 V
JESD-30 code	R-PDSO-G16
JESD-609 code	e3
length	4.9 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	16
Maximum operating temperature	85 °C
Minimum operating temperature
Maximum output current	10 A
Package body material	PLASTIC/EPOXY
encapsulated code	SSOP
Encapsulate equivalent code	SSOP16,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	1.75 mm
surface mount	YES
Switch configuration	PUSH-PULL
Maximum switching frequency	500 kHz
technology	CMOS
Temperature level	OTHER
Terminal surface	Matte Tin (Sn)
Terminal form	GULL WING
Terminal pitch	0.635 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	30
width	3.9116 mm
Base Number Matches	1

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FEATURES

LTC3831

High Power Synchronous

Switching Regulator Controller

for DDR Memory Termination

DESCRIPTION

The LTC

3831 is a high power, high efﬁciency switching

regulator controller designed for DDR memory termina-

tion. The LTC3831 generates an output voltage equal

to 1/2 of an external supply or reference voltage. The

LTC3831 uses a synchronous switching architecture

with N-channel MOSFETs. Additionally, the chip senses

output current through the drain-source resistance of the

upper N-channel FET, providing an adjustable current limit

without a current sense resistor.

The LTC3831 operates with input supply voltage as low as

3V and with a maximum duty cycle of > 91%. It includes

a ﬁxed frequency PWM oscillator for low output ripple

operation. The 200kHz free-running clock frequency can

be externally adjusted or synchronized with an external

signal from 100kHz to above 500kHz. In shutdown mode,

the LTC3831 supply current drops to <10μA.

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

All other trademarks are the property of their respective owners.

High Power Switching Regulator Controller

for DDR Memory Termination

OUT

Tracks 1/2 of V

or External V

REF

No Current Sense Resistor Required

Low Input Supply Voltage Range: 3V to 8V

Maximum Duty Cycle > 91% Over Temperature

Drives All N-Channel External MOSFETs

High Efﬁciency: Over 95% Possible

Programmable Fixed Frequency Operation:

100kHz to 500kHz

External Clock Synchronization Operation

Programmable Soft-Start

Low Shutdown Current: <10μA

Overtemperature Protection

Available in 16-Pin Narrow SSOP Package

APPLICATIONS

DDR SDRAM Termination

SSTL_2 Interface

SSTL_3 Interface

TYPICAL APPLICATION

DDQ

2.5V

Efﬁciency vs Load Current

330μF

×2

EFFICIENCY (%)

100

OUT

470μF

×3

3831 F01

MBR0530T1

1μF

0.1μF

CC2

0.01μF

130k

SHDN

33pF

15k

1500pF

CC1

MAX

LTC3831 I

FREQSET

SHDN

COMP

PGND

GND

–

: SANYO POSCAP 6TPB330M

OUT

: SANYO POSCAP 4TPB470M

Q1, Q2: SILICONIX Si4410DY

MBRS340T3

0.1μF

1.2μH

10k

MBRS340T3

0.1μF

4.7μF

1.25V

±6A

= 25°C

= 2.5V

OUT

= 1.25V

LOAD CURRENT (A)

2831 G01

Figure 1. Typical DDR Memory Termination Application

3831fb

LTC3831IGN#TRPBF Related Products

	LTC3831IGN#TRPBF	LTC3831EGN#TR	LTC3831EGN#PBF	LTC3831IGN#PBF	LTC3831EGN#TRPBF	LTC3831IGN	LTC3831IGN#TR
Description	IC SW REG CONTROLLR SYNC 16-SSOP	IC SW reg controllr sync 16-ssop	IC SW REG CONTROLLR SYNC 16-SSOP	IC SW REG CONTROLLR SYNC 16-SSOP	IC SW REG CONTROLLR SYNC 16-SSOP	IC SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16, 0.150 INCH, PLASTIC, SSOP-16, Switching Regulator or Controller	IC SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16, 0.150 INCH, PLASTIC, SSOP-16, Switching Regulator or Controller
Is it Rohs certified?	conform to	incompatible	conform to	conform to	conform to	incompatible	incompatible
Parts packaging code	SSOP	SSOP	SSOP	SSOP	SSOP	SOIC	SOIC
package instruction	SSOP, SSOP16,.25	SSOP, SSOP16,.25	SSOP, SSOP16,.25	SSOP, SSOP16,.25	SSOP, SSOP16,.25	SSOP, SSOP16,.25	SSOP, SSOP16,.25
Contacts	16	16	16	16	16	16	16
Reach Compliance Code	compliant	_compli	compliant	compliant	compliant	not_compliant	not_compliant
ECCN code	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER
control mode	VOLTAGE-MODE	VOLTAGE-MODE	VOLTAGE-MODE	VOLTAGE-MODE	VOLTAGE-MODE	VOLTAGE-MODE	VOLTAGE-MODE
Control Technology	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
Maximum input voltage	8 V	8 V	8 V	8 V	8 V	8 V	8 V
Minimum input voltage	3 V	3 V	3 V	3 V	3 V	3 V	3 V
Nominal input voltage	5 V	5 V	5 V	5 V	5 V	5 V	5 V
JESD-30 code	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16
JESD-609 code	e3	e0	e3	e3	e3	e0	e0
length	4.9 mm	4.9 mm	4.9 mm	4.9 mm	4.9 mm	4.9 mm	4.9 mm
Humidity sensitivity level	1	1	1	1	1	1	1
Number of functions	1	1	1	1	1	1	1
Number of terminals	16	16	16	16	16	16	16
Maximum operating temperature	85 °C	85 °C	85 °C	85 °C	85 °C	85 °C	85 °C
Maximum output current	10 A	10 A	10 A	10 A	10 A	10 A	10 A
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SSOP	SSOP	SSOP	SSOP	SSOP	SSOP	SSOP
Encapsulate equivalent code	SSOP16,.25	SSOP16,.25	SSOP16,.25	SSOP16,.25	SSOP16,.25	SSOP16,.25	SSOP16,.25
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	260	235	260	260	260	235	235
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	1.75 mm	1.75 mm	1.75 mm	1.75 mm	1.75 mm	1.75 mm	1.75 mm
surface mount	YES	YES	YES	YES	YES	YES	YES
Switch configuration	PUSH-PULL	PUSH-PULL	PUSH-PULL	PUSH-PULL	PUSH-PULL	PUSH-PULL	PUSH-PULL
Maximum switching frequency	500 kHz	500 kHz	500 kHz	500 kHz	500 kHz	500 kHz	500 kHz
technology	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
Temperature level	OTHER	OTHER	OTHER	OTHER	OTHER	OTHER	OTHER
Terminal surface	Matte Tin (Sn)	Tin/Lead (Sn/Pb)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)
Terminal form	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING
Terminal pitch	0.635 mm	0.635 mm	0.635 mm	0.635 mm	0.635 mm	0.635 mm	0.635 mm
Terminal location	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	30	20	30	30	30	20	20
width	3.9116 mm	3.9116 mm	3.9116 mm	3.9116 mm	3.9116 mm	3.9116 mm	3.9116 mm
Base Number Matches	1	1	1	1	1	1	1
Brand Name	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	-	-
Maker	Linear ( ADI )	-	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	-	-
Manufacturer packaging code	GN	GN	GN	GN	GN	-	-
Is Samacsys	N	-	N	N	N	N	N

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