LTC3831 LINER [Linear Technology], LTC3831 Datasheet

LTC3831

Manufacturer Part Number

LTC3831

Description

High Power Synchronous Switching Regulator Controller for DDR Memory Termination

Manufacturer

LINER [Linear Technology]

Datasheet

1.LTC3831.pdf (20 pages)

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FEATURES

TYPICAL APPLICATIO

APPLICATIO S

High Power Switching Regulator Controller

for DDR Memory Termination

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:

External Clock Synchronization Operation

Programmable Soft-Start

Low Shutdown Current: <10 A

Overtemperature Protection

Available in 16-Pin Narrow SSOP Package

DDR SDRAM Termination

SSTL_2 Interface

SSTL_3 Interface

OUT

4.7 F

33pF

100kHz to 500kHz

0.1 F

Tracks 1/2 of V

1 F

SHDN

15k

1500pF

0.01 F

130k

Figure 1. Typical DDR Memory Termination Application

FREQSET

SHDN

COMP

CC2

LTC3831

–

PGND

or External V

GND

CC1

MAX

MBR0530T1

10k

Q1, Q2: SILICONIX Si4410DY

OUT

REF

: SANYO POSCAP 6TPB330M

: SANYO POSCAP 4TPB470M

0.1 F

2.5V

DDQ

MBRS340T3

1.2 H

DESCRIPTIO

The LTC

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-chan-

nel MOSFETs. Additionally, the chip senses output cur-

rent 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 <10 A.

Switching Regulator Controller

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

for DDR Memory Termination

470 F

OUT

3831 is a high power, high efficiency switching

High Power Synchronous

3831 F01

330 F

1.25V

100

Efficiency vs Load Current

OUT

= 25 C

= 2.5V

= 1.25V

LOAD CURRENT (A)

LTC3831

2831 G01

3831f

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