TPS51916 Datasheet, PDF (1/33 Pages) Texas Instruments – Complete DDR2, DDR3 and DDR3L Memory Power Solution Synchronous Buck Controller, 2-A LDO, Buffered Reference

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
FEATURES
1
•2 Synchronous Buck Controller (VDDQ)
– Conversion Voltage Range: 3 V to 28 V
– Output Voltage Range: 0.7 V to 1.8 V
– 0.8% V_REF Accuracy
– Selectable Control Architecture
– D-CAP™ Mode for Fast Transient
Response
– D-CAP2™ Mode for Ceramic Output
Capacitors
– Selectable 300 kHz/ 400 kHz/ 500 kHz/
670 kHz Switching Frequencies
– Optimized Efficiency at Light and Heavy
Loads with Auto-skip Function
– Supports Soft-Off in S4/S5 States
– OCL/OVP/UVP/UVLO Protections
– Powergood Output
• 2-A LDO(VTT), Buffered Reference(VTTREF)
– 2-A (Peak) Sink and Source Current
– Requires Only 10-μF of Ceramic Output
Capacitance
– Buffered, Low Noise, 10-mA VTTREF
Output
– 0.8% VTTREF, 20-mV VTT Accuracy
– Support High-Z in S3 and Soft-Off in S4/S5
• Thermal Shutdown
• 20-Pin, 3 mm × 3 mm, QFN Package
APPLICATIONS
• DDR2/DDR3/DDR3L Memory Power Supplies
• SSTL_18, SSTL_15, SSTL_135 and HSTL
Termination
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
10-μF of ceramic capacitance. In addition, a
dedicated LDO supply input is available.
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 R_DS(on) sensing, OVP/UVP/UVLO
and thermal shutdown protections are also available.
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.
VIN
5VIN
PGND
12
TPS51916
V5IN
VBST
15
S3
S5
PGND
17 S3
16 S5
6 VREF
DRVH 14
SW 13
DRVL 11
PGND 10
PGOOD 20
8 REFIN _{VDDQSNS 9}
7 GND
VLDOIN 2
VTT 3
19 MODE VTTSNS 1
18 TRIP
VTTGND 4
VTTREF 5
VDDQ
Powergood
VTT
VTTREF
AGND PGND
UDG-10193
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.
D-CAP, D-CAP2 are trademarks of Texas Instruments.
2
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