LTC3831IGN#TRPBF datasheet, PDF

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LTC3831IGN#TRPBF: DescriptionDC/DC Cntrlr Single-OUT 240kHz 16-Pin SSOP N T/R; File Size210KB，20 Pages; ManufacturerADI; Websitehttps://www.analog.com

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LTC3831IGN#TRPBF Overview

DC/DC Cntrlr Single-OUT 240kHz 16-Pin SSOP N T/R

LTC3831IGN#TRPBF Parametric

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Compliant
ECCN (US)	EAR99
Part Status	Active
HTS	8542.39.00.01
Number of Outputs	1
Maximum Switching Frequency (kHz)	240
Minimum Input Voltage (V)	3
Maximum Input Voltage (V)	8
Operating Supply Voltage (V)	3 to 8
Maximum Supply Current (mA)	1.6
Minimum Switching Frequency (kHz)	160
Typical Switching Frequency (kHz)	200
Synchronous Rectifier	Yes
Synchronous Clock	Yes
Control Method	PWM
Programmability	Yes
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	85
Supplier Temperature Grade	Industrial
Pin Count	16
Standard Package Name	SOP
Supplier Package	SSOP N
Mounting	Surface Mount
Package Height	1.5(Max)
Package Length	4.98(Max)
Package Width	3.99(Max)
PCB changed	16
Lead Shape	Gull-wing

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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#PBF	LTC3831EGN#TR	LTC3831EGN#TRPBF	LTC3831EGN	LTC3831IGN#PBF
Description	DC/DC Cntrlr Single-OUT 240kHz 16-Pin SSOP N T/R	DC/DC Cntrlr Single-OUT 240kHz 16-Pin SSOP N Tube	DC/DC Cntrlr Single-OUT 240kHz 16-Pin SSOP N T/R	DC/DC Cntrlr Single-OUT 240kHz 16-Pin SSOP N T/R	DC/DC Cntrlr Single-OUT 240kHz 16-Pin SSOP N Tube	DC/DC Cntrlr Single-OUT 240kHz 16-Pin SSOP N Tube
EU restricts the use of certain hazardous substances	Compliant	Compliant	Not Compliant	Compliant	Not Compliant	Compliant
ECCN (US)	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Part Status	Active	Active	Unconfirmed	Active	Unconfirmed	Active
Number of Outputs	1	1	1	1	1	1
Maximum Switching Frequency (kHz)	240	240	240	240	240	240
Minimum Input Voltage (V)	3	3	3	3	3	3
Maximum Input Voltage (V)	8	8	8	8	8	8
Operating Supply Voltage (V)	3 to 8	3 to 8	3 to 8	3 to 8	3 to 8	3 to 8
Maximum Supply Current (mA)	1.6	1.6	1.6	1.6	1.6	1.6
Minimum Switching Frequency (kHz)	160	160	160	160	160	160
Typical Switching Frequency (kHz)	200	200	200	200	200	200
Synchronous Rectifier	Yes	Yes	Yes	Yes	Yes	Yes
Synchronous Clock	Yes	Yes	Yes	Yes	Yes	Yes
Control Method	PWM	PWM	PWM	PWM	PWM	PWM
Programmability	Yes	Yes	Yes	Yes	Yes	Yes
Minimum Operating Temperature (°C)	-40	-40	-40	-40	-40	-40
Maximum Operating Temperature (°C)	85	85	85	85	85	85
Supplier Temperature Grade	Industrial	Extended	Extended	Extended	Extended	Industrial
Pin Count	16	16	16	16	16	16
Standard Package Name	SOP	SOP	SOP	SOP	SOP	SOP
Supplier Package	SSOP N	SSOP N	SSOP N	SSOP N	SSOP N	SSOP N
Mounting	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package Height	1.5(Max)	1.5(Max)	1.5(Max)	1.5(Max)	1.5(Max)	1.5(Max)
Package Length	4.98(Max)	4.98(Max)	4.98(Max)	4.98(Max)	4.98(Max)	4.98(Max)
Package Width	3.99(Max)	3.99(Max)	3.99(Max)	3.99(Max)	3.99(Max)	3.99(Max)
PCB changed	16	16	16	16	16	16
Lead Shape	Gull-wing	Gull-wing	Gull-wing	Gull-wing	Gull-wing	Gull-wing
HTS	8542.39.00.01	8542.39.00.01	-	8542.39.00.01	8542.39.00.01	8542.39.00.01
Packaging	-	Tube	-	Tape and Reel	Tube	Tube

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