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PDF G5616A Data sheet ( Hoja de datos )
| Número de pieza | G5616A | |
| Descripción | Complete DDR / DDRII and DDRIII Memory Solution Synchronous Buck PWM Controller | |
| Fabricantes | Global Mixed-mode Technology | |
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Global Mixed-mode Technology
G5616A
Complete DDR, DDRII and DDRIII Memory Solution
Synchronous Buck PWM Controller, 2A 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 0.75V to 3.6V
Adjustable Output Range
2V to 28V Battery Input Range
Programmable Switching Frequency
OVP & UVP of VDDQ Output
Drives Large Synchronous-Rectifier FETs
Power-Good Indicator
•2-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 G5616A is intended for DDR/SSTL-2,
DDRII/SSTL-18 and DDRIII memory systems. It inte-
grates a synchronous buck PWM controller with a 2A
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 G5616A 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 2A 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 G5616A 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
G5616A includes integrated sleep-state controls plac-
ing VTT in High-Z in S3 (suspend to RAM) and soft-off
for VTT and VTTREF in S5 (Shutdown).
The G5616A 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
G5616ARZ1U
G5616AR51U
Note: RZ: TQFN3X3-20
1: Bonding Code
U : Tape & Reel
MARKING
5616A
5616A
R5: TQFN4X4-24
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
PACKAGE
(Green)
TQFN3X3-20
TQFN4X4-24
Ver: 1.0
Oct 26, 2012
TEL: 886-3-5788833
http://www.gmt.com.tw
1
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| Páginas | Total 2 Páginas | |
| PDF Descargar | [ Datasheet G5616A.PDF ] | |
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