G5616 판매점 - Complete DDR / DDRII and DDRIII Memory Solution Synchronous Buck PWM Controller

Global Mixed-mode Technology

G5616

Complete DDR, DDRII and DDRIII Memory Solution

Synchronous Buck PWM Controller, 3A LDO,

Buffered Reference

Features

•Synchronous Buck Controller (VDDQ)

Ultra-High Efficiency

No Current-Sense Resistor (Lossless ILIMIT)

Quasi-PWM with 100ns Load-Step Response

1.8V(DDRII) /1.5V(DDRIII) Fixed or Adjustable

to 2.5V(DDR) or 0.75V to 3.6V Adjustable Out-

put Range

2V to 24V Battery Input Range

400kHz Switching Frequency

OVP & UVP of VDDQ Output

Drives Large Synchronous-Rectifier FETs

Power-Good Indicator

•3-A LDO (VTT), Buffered Reference (VTTREF)

Support DDR (1.25 VTT) , DDR II (0.9 VTT) and

DDRIII(0.75 VTT) Requirements

VLDOIN Voltage Range: 1.2V to 3.6V

Requires Only 20µF Ceramic VTT Output Ca-

pacitance

Supports High-Z in S3 and Soft-Off in S5

Integrated Divider Tracks 1/2 VDDQSNS for

Both VTT and VTTREF

Remote Sensing (VTTSNS)

±20mV Accuracy for VTT and VTTREF

10mA Buffered Reference (VTTREF)

Built-In Soft-Start to Reduce the VLDOIN Surg-

ing Current

Over Current Protection of VTT Output

Thermal Shutdown Protection

Applications

Notebook Computers

CPU Core Supply

Chipset/RAM Supply as Low as 0.75V

1.8V and 2.5V I/O Supply

General Description

The G5616 is intended for DDR/SSTL-2, D-

DRII/SSTL-18 and DDRIII memory systems. It inte-

grates a synchronous buck PWM controller with a 3-A

sink-source linear regulator and buffered reference.

The PWM controller uses constant on-time control

scheme to handle wide input/output voltage ratios with

ease and provides 100ns “instant-on” response to

load transients while maintaining a relatively constant

switching frequency. The G5616 achieves high effi-

ciency at a reduced cost by eliminating the cur-

rent-sense resistor found in traditional current-mode

PWMs. Efficiency is further enhanced by an ability to

drive very large synchronous rectifier MOSFETs. Sin-

gle-stage buck conversion allows these devices to

directly step down high-voltage batteries for the high-

est possible efficiency.

The 3A sink/source tracking termination regulator is

specifically designed for low-cost/ low-external com-

ponent count systems. The regulator contains a high

speed operational amplifier that provides fast load

transient response with only 20µF (2x10µF) of ceramic

output capacitance. The G5616 supports remote

sensing functions and all features required to power

the DDR /DDRII /DDRIII VTT bus termination accord-

ing to the JEDEC specification. In addition, the G5616

includes integrated sleep-state controls placing VTT in

High-Z in S3 (suspend to RAM) and soft-off for VTT

and VTTREF in S5 (Shutdown).

The G5616 provides OVP, UVP, over current and

thermal shutdown protection functions and is available

in a 20-pin 3X3 TQFN package and 24-pin 4X4 TQFN

includes over voltage protection.

Ordering Information

ORDER

NUMBER

G5616RZ1U

G5616R51U

Note: RZ: TQFN3X3-20

1: Bonding Code

U : Tape & Reel

MARKING

5616

R5: TQFN4X4-24

TEMP.

RANGE

-40°C to +85°C

PACKAGE

(Green)

TQFN3X3-20

TQFN4X4-24

Ver: 1.5

Oct 26, 2012

TEL: 886-3-5788833

http://www.gmt.com.tw

G5616 반도체 회로 부품 판매점

Complete DDR / DDRII and DDRIII Memory Solution Synchronous Buck PWM Controller

국내 전력반도체 판매점

일반적인 전자부품 판매점

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