G5316

G5316
Global Mixed-mode Technology
Complete DDR2, DDR3 and DDR3L Memory
Solution Synchronous Buck PWM Controller,
2A LDO, Buffered Reference
Features
•Synchronous Buck Controller (VDDQ)
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General Description
The G5316 is intended for DDR2, DDR3 and DDR3L
memory systems. It integrates a synchronous buck
PWM controller with a 2-A sink-source linear regulator
and buffered reference.
Ultra-High Efficiency at Light and Heavy Load
with Auto-skip Function
No Current-Sense Resistor (Lossless ILIMIT)
Quasi-PWM with 100ns Load-Step Response
0.7V to 1.8V Adjustable Output Range
3V to 28V Battery Input Range
0.8% Vref Accuracy
Supports Soft-off in S4/S5 States
Selectable 300k/400kHz Switching Frequency
OVP & UVP of VDDQ Output
Drives Large Synchronous-Rectifier FETs
Power-Good Indicator
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 G5316 achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode
PWMs. Efficiency is further enhanced by an ability to
drive very large synchronous rectifier MOSFETs. Single-stage buck conversion allows these devices to
directly step down high-voltage batteries for the highest possible efficiency.
•2-A LDO (VTT), Buffered Reference (VTTREF)
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VLDOIN Voltage Range: 1.2 V to 3.6 V
Requires Only 10µF Ceramic VTT Output Capacitance
Supports High-Z in S3 and Soft-Off in S4/S5
Integrated Divider Tracks 1/2 VDDQSNS for
Both VTT and VTTREF
Remote Sensing (VTTSNS)
±20mV VTT and 0.8% VTTREF Accuracy
10mA Buffered Reference (VTTREF)
Built-In Soft-Start to Reduce the VLDOIN Surging Current
Over Current Protection of VTT Output
Thermal Shutdown Protection
The 2A sink/source tracking termination regulator is
specifically designed for low-cost/ low-external component count systems. The regulator contains a high
speed operational amplifier that provides fast load
transient response with only 10µF of ceramic output
capacitance. The G5316 supports remote sensing
functions and all features required to power the DDR2
/DDR3 /DDR3L VTT bus termination according to the
JEDEC specification. In addition, the G5316 includes
integrated sleep-state controls placing VTT in High-Z
in S3 (suspend to RAM) and soft-off for VTT and
VTTREF in S4/S5 (Shutdown).
Applications
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Notebook Computers
CPU Core Supply
„ Chipset/RAM Supply as Low as 0.7V
The G5316 provides OVP, UVP, over current and
thermal shutdown protection functions and is available
in a 20-pin 3X3 TQFN package.
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Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
(Green)
G5316RZ1U
G5316RZ1D
5316
5316
-40°C to +85°C
-40°C to +85°C
TQFN3X3-20
TQFN3X3-20
Note: RZ: TQFN3X3-20
1: Bonding Code
U & D : Tape & Reel
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.9
Jan 18, 2013
1
G5316
Global Mixed-mode Technology
PGOOD
MODE
TRIP
S3
S5
20
19
18
17
16
Pin Configuration
VTTSNS
1
15
BST
VLDOIN
2
14
DH
VTT
3
13
LX
VTTGND
4
12
VCC
VTTREF
5
11
DL
7
8
9
10
GND
REFIN
VDDQSNS
PGND
VREF
6
Thermal
Pad
G5316 TQFN3X3-20
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.9
Jan 18, 2013
2