G2985 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – DDR Termination Regulator

Global Mixed-mode Technology
DDR Termination Regulator
G2985
Features
„ VIN Input Voltage Range: 2.5V to 5.5V
„ VLDOIN Voltage Range: 1.1V to 3.5V
„ Support DDR I (1.25 VTT), DDR II (0.9 VTT),
DDR III (0.75 VTT), DDR IIIL (0.675VTT) and
DDR IV (0.6 VTT) Requirements
„ Stable with Output Ceramic Capacitor
„ PGOOD to Monitor Output Regulation
„ EN Input for Shutdown Function (S3 Mode)
„ Remote Sensing (VOSNS)
„ 2A Source and Sink Current
„ ±25mV Accuracy for VTT Refers to VTTREF
„ ±10mA Buffered Reference (VTTREF)
„ Built-In Soft-Start and UVLO
„ Over Current Protection
„ Thermal Shutdown Protection
„ TDFN3X3-10 (Thermal Pad) Package
Applications
„ DDR I/II/III/IIIL/IV Memory Termination
„ SSTL_3, SSTL_2, SSTL_18, SSTL_15
„ HSTL Termination
„ Notebook/Desktop/Server
„ Telecom/Datacom, GSM Base Station,
LCD-TV/PDP-TV, Copier/Printer, Set-Top Box
Ordering Information
ORDER
NUMBER
G2985RE1D
Note: RE: TDFN3X3-10
1: Bonding code
D: Tape & Reel
MARKING
2985
Pin Configuration
General Description
The G2985 is a linear regulator designed to meet the
JEDEC SSTL (Series Stub Termination Logic) speci-
fications in DDRI/II/III/IIIL/IV –SDRAM systems. It is
designed for the system which has low input voltage,
low cost, low noise and space consideration.
The G2985 provides accurate and fast response with
up to 2A source/sink ability in load transient to track
reference voltage with typically 20µF output capacitor.
The terminated voltage can be generated by two ex-
ternal resistors or programmed by forcing REFIN pin
at a desired voltage. Also the G2985 provides an
open-drain PGOOD flag which monitors the output
regulation and an EN signal to discharge VTT during
STR (S3) mode.
TEMP.
RANGE
-40°C~85°C
PACKAGE
(Green)
TDFN3X3-10
Typical Application
G2985
REFIN 1
VLDOIN 2
VO 3
PGND 4
VOSNS 5
Thermal
Pad
1100 VIN
9 PGOOD
8 GND
7 EN
6 REFOUT
TDFN3X3-10
Note: Recommend connecting the Thermal Pad to
the Ground for excellent power dissipation.
VDDQ
VLDOIN
VTT
1
REFIN
10
VIN
G2985
2
9
VLDOIN PGOOD
3
VO
GND ⁸
4
PGND
5
VOSNS
7
EN
REFOUT ⁶
PGOOD
SLP_S3
VTTREF
0.1µF
Ver:1.0
Mar 07, 2014
TEL: [phone]
http://www.gmt.com.tw
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