TPS51916
www.ti.com
SLUSAE1B –DECEMBER 2010–REVISED AUGUST 2011
Complete DDR2, DDR3 and DDR3L Memory Power Solution Synchronous Buck
Controller, 2-A LDO, Buffered Reference
1
FEATURES
DESCRIPTION
The TPS51916 provides a complete power supply for
DDR2, DDR3 and DDR3L memory systems in the
lowest total cost and minimum space. It integrates a
synchronous buck regulator controller (VDDQ) with a
2-A sink/source tracking LDO (VTT) and buffered low
noise reference (VTTREF). The TPS51916 employs
D-CAP™ mode coupled with 300 kHz/400 kHz
frequencies for ease-of-use and fast transient
response or D-CAP2™ mode coupled with higher
500 kHz/670 kHz frequencies to support ceramic
output capacitor without an external compensation
circuit. The VTTREF tracks VDDQ/2 within excellent
0.8% accuracy. The VTT, which provides 2-A
sink/source peak current capabilities, requires only
2
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Synchronous Buck Controller (VDDQ)
–
–
–
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Conversion Voltage Range: 3 V to 28 V
Output Voltage Range: 0.7 V to 1.8 V
0.8% VREF Accuracy
Selectable Control Architecture
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D-CAP™ Mode for Fast Transient
Response
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D-CAP2™ Mode for Ceramic Output
Capacitors
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Selectable 300 kHz/ 400 kHz/ 500 kHz/
670 kHz Switching Frequencies
Optimized Efficiency at Light and Heavy
Loads with Auto-skip Function
10-μF of ceramic capacitance. In addition,
a
dedicated LDO supply input is available.
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–
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Supports Soft-Off in S4/S5 States
OCL/OVP/UVP/UVLO Protections
Powergood Output
The TPS51916 provides rich useful functions as well
as excellent power supply performance. It supports
flexible power state control, placing VTT at high-Z in
S3 and discharging VDDQ, VTT and VTTREF
(soft-off) in S4/S5 state. Programmable OCL with
low-side MOSFET RDS(on) sensing, OVP/UVP/UVLO
and thermal shutdown protections are also available.
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2-A LDO(VTT), Buffered Reference(VTTREF)
–
–
2-A (Peak) Sink and Source Current
Requires Only 10-μF of Ceramic Output
Capacitance
The TPS51916 is available in a 20-pin, 3 mm × 3
mm, QFN package and is specified for ambient
temperature from –40°C to 85°C.
–
Buffered, Low Noise, 10-mA VTTREF
Output
VIN
–
–
0.8% VTTREF, 20-mV VTT Accuracy
Support High-Z in S3 and Soft-Off in S4/S5
5VIN
TPS51916
•
•
Thermal Shutdown
PGND
VBST 15
12 V5IN
VDDQ
20-Pin, 3 mm × 3 mm, QFN Package
DRVH 14
S3
S5
17 S3
16 S5
SW 13
APPLICATIONS
PGND
DRVL 11
PGND 10
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•
DDR2/DDR3/DDR3L Memory Power Supplies
6
8
7
VREF
SSTL_18, SSTL_15, SSTL_135 and HSTL
Termination
PGOOD 20
Powergood
REFIN
GND
VDDQSNS
VLDOIN
VTT
9
2
3
1
4
5
VTT
19 MODE
18 TRIP
VTTSNS
VTTGND
VTTREF
VTTREF
UDG-10193
AGND PGND
AGND
PGND
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
D-CAP, D-CAP2 are trademarks of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010–2011, Texas Instruments Incorporated