MIC5164
Dual Regulator Controller for DDR3
GDDR3/4/5 Memory and High-Speed
Bus Termination
General Description
The MIC5164 is a dual regulator controller designed for
high speed bus termination. It offers a simple, low-cost
JEDEC-compliant solution for terminating high-speed, low-
voltage digital buses (i.e. DDR, DDR2, DDR3, SCSI, GTL,
SSTL, HSTL, LV-TTL, Rambus, LV-PECL, LV-ECL, etc)
with a Power Good (PG) signal.
The MIC5164 controls two external N-Channel MOSFETs
to form two separate regulators. It operates by switching
between either the high-side MOSFET or the low-side
MOSFET depending on whether the current is being
sourced to the load or sunk by the regulator.
Designed to provide a universal solution for bus
termination regardless of input voltage, output voltage, or
load current, the desired MIC5164 output voltage can be
programmed by forcing the reference voltage externally to
the desired voltage.
The MIC5164 operates from an input of 1.35V to 6V, with
a second bias supply input required for operation. It is
available in the tiny MSOP-10 package with an operating
junction temperature range of
−40°C
to
+125°C.
Data sheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
Input voltage range: 1.35V to 6V
Up to 7A V
TT
Current
Tracking programmable output
Power Good (PG) signal
Wide bandwidth
Logic controlled enable input
Requires minimal external components
DDR, DDR2, DDR3, memory termination
−40°C
< T
J
<
+125°C
JEDEC-compliant bus termination for SCSI, GTL, SSTL,
HSTL, LV-TTL, Rambus, LV-PECL, LV-ECL, etc
•
Tiny MSOP-10 package
Applications
•
Desktop computers
•
Notebook computers
•
Communication systems
•
Video cards
•
DDR/DDR2/DDR3 memory termination
____________________________________________________________________________________________________________
Typical Application
Typical SSTL-2 Application
(Two MOSFETs Support a 3.5A Application)
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
June 2010
M9999-061510
Micrel, Inc.
MIC5164
Ordering Information
Part Number
MIC5164YMM
Temperature Range
–40° to +125°C
Package
10-Pin MSOP
Lead Finish
Pb-Free
Note:
MSOP is a Green RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
10-Pin MSOP (MM)
Pin Description
Pin Number
1
2
3
4
5
6
7
8
9
10
Pin Name
VCC
EN
VDDQ
VREF
GND
FB
COMP
LD
HD
PG
Pin Function
Bias Supply (Input): Apply 3V-6V to this input for internal bias to the controller.
Enable (Input): CMOS compatible input. Logic high = enable, logic low = shutdown. The EN pin can
be tied directly to VDDQ or VCC for functionality. Do not float the EN pin. Floating this pin causes the
enable to be in an undetermined state.
Input Supply Voltage.
Reference voltage equal to half of VDDQ.
For internal use only.
Ground.
Feedback (Input): Input to the internal error amplifier.
Compensation (Output): Connect a capacitor and resistor from COMP pin to FB pin for
compensation of the internal control loop.
Low-side drive (Output): Connects to the Gate of the external low-side MOSFET.
High-side drive (Output): Connects to the Gate of the external high-side MOSFET.
Power Good (Output): Open drain output.
June 2010
2
M9999-061510
Micrel, Inc.
MIC5164
Absolute Maximum Ratings
(1)
VCC to GND....................................................
−0.3V
to +7V
VDDQ to GND .................................................
−0.3V
to +7V
EN to GND .......................................................
−0.3V
to V
CC
FB to GND........................................................
−0.3V
to V
CC
VREF to GND.................................................
−0.3V
to V
DDQ
COMP to GND..................................................
−0.3V
to V
CC
HD, LD to GND ................................................
−0.3V
to V
CC
PG to GND .......................................................
−0.3V
to V
CC
Lead Temperature (Soldering 10sec.) ....................... 260°C
Storage Temperature (T
S
).........................−65°C to +150°C
ESD Rating
(3)
(HBM) ....................................................+2kV
(MM) ...................................................+300V
Operating Ratings
(2)
Supply Voltage (V
CC
).............................................. 3V to 6V
Supply Voltage (V
DDQ
) ....................................... 1.35V to 6V
Enable Input Voltage (V
EN
)..................................... 0V to V
IN
Junction Temperature Range (T
J
)......
−40°C
< T
J
< +125°C
Junction Thermal Resistance
MSOP-10 (θ
JA
)..............................................130.5°C/W
MSOP-10 (θ
JC
)................................................42.6°C/W
Electrical Characteristics
(4)
T
A
= 25°C = VDDQ = 1.5V; VCC = EN = 5V,
bold
values indicate –40°C
≤
T
J
≤
+125°C, unless otherwise specified. See
test circuit 1 for test circuit configuration.
Parameter
VREF Voltage Accuracy
Sourcing; 100mA to 3A
V
TT
Voltage Accuracy (Note
5)
Sinking; -100mA to -3A
Supply Current (I
DDQ
)
Supply Current (I
CC
)
I
CC
Shutdown Current (Note
6)
Start-Up Time (Note
7)
Enable Input
Enable Input Threshold
Enable Hysteresis
EN Pin Input Current
Power Good Output
Power Good Window
Threshold, ±% of V
TT
from Nominal
Hysteresis
Power Good Output Low Voltage
Power Good Leakage Current
Power Good Startup Delay Time
(Note
8)
I
PG
= 2mA (sinking)
PG = EN = 5V, FB = VREF; Switch Leakage Current
to Ground
1
±5
±10
2
100
0.01
2.4
300
1.0
±15
%
%
mV
μA
ms
V
IL
< 0.2V (controller shutdown)
V
IH
> 1.2V (controller enable)
Regulator Enabled
Regulator Shutdown
50
0.01
5.75
1.2
0.3
V
V
mV
µA
µA
EN = 1.2V (controller ON)
No Load
No Load
EN = 0.2V (controller OFF); No PG pull-up
VCC = 5V external bias; EN = V
IN
Condition
Min.
-1%
-5
-10
-5
-10
Typ.
0.5V
DDQ
0.4
0.4
25
15
0.1
8
Max.
+1%
+5
+10
+5
+10
140
200
22
27
5
15
30
Units
V
mV
mV
mV
mV
µA
µA
mA
mA
µA
µs
µs
June 2010
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M9999-061510
Micrel, Inc.
MIC5164
Electrical Characteristics
(4)
(Continued)
T
A
= 25°C = VDDQ = 1.5V; VCC = 5V, V
EN
= V
CC
,
bold
values indicate –40°C
≤
T
J
≤
+125°C, unless otherwise specified.
See test circuit 1 for test circuit configuration.
Parameter
Power Good Output
Power Good Deglitch (Note
9)
Driver
High-Side Gate Drive Voltage
Low-Side Gate Drive Voltage
Notes:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model 1.5kΩ in series with 100pF.
Specification for packaged product only.
The V
TT
voltage accuracy is measured as a delta voltage from the reference output (V
TT
- V
REF
).
Shutdown current is measured only on the VCC pin. The VDDQ pin will always draw a minimum amount of current when voltage is applied.
Start-up time is defined as the amount of time from EN = V
CC
to V
HD
= 90% of V
CC
.
Power Good startup delay is defined as the amount of time from EN =VCC and V
FB
is within ±10% of ½V
DDQ
to V
PG
= 90% of V
CC
(V
FB
= V
REF
),
during startup (V
FB
is the sense of V
TT
).
Power Good deglitch is defined as the amount of time from the voltage at FB node going out of PG window (with 10mV overdrive voltage) to PG =
LOW.
Condition
Time after V
FB
voltage has gone outside of PG
window
High-Side MOSFET Fully ON
High-Side MOSFET Fully OFF
Low-Side MOSFET Fully ON
Low-Side MOSFET Fully OFF
Min.
Typ.
Max.
Units
5
10
μs
4.8
4.97
0.03
0.2
4.97
0.03
0.2
V
V
V
V
4.8
June 2010
4
M9999-061510
Micrel, Inc.
MIC5164
Test Circuit
Figure 1. Test Circuit
June 2010
5
M9999-061510
PCB设计
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