TPS51716 Datasheet, PDF (1/30 Pages) Texas Instruments – Complete DDR2, DDR3, DDR3L, and LPDDR3 Memory Power Solution Synchronous Buck Controller, 2-A LDO, with Buffered Reference

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TPS51716
TPS51716
SLUSB94 – OCTOBER 2012
Complete DDR2, DDR3, DDR3L, and LPDDR3 Memory Power Solution
Synchronous Buck Controller, 2-A LDO, with Buffered Reference
Check for Samples: TPS51716
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
– D-CAP2™ Mode for Ceramic Output
Capacitors
– Selectable 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/LPDDR3 Memory Power
Supplies
• SSTL_18, SSTL_15, SSTL_135 and HSTL
Termination
DESCRIPTION
The TPS51716 provides a complete power supply for
DDR2, DDR3, DDR3L, and LPDDR3 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
TPS51716 employs D-CAP2™ mode coupled with
500 kHz or 670 kHz operating frequencies that
supports ceramic output capacitors without an
external compensation circuit. The VTTREF tracks
VDDQ/2 with excellent 0.8% accuracy. The VTT,
which provides 2-A sink/source peak current
capabilities, requires only 10-μF of ceramic
capacitance. In addition, the device features a
dedicated LDO supply input.
The TPS51716 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. It includes programmable OCL
with low-side MOSFET R_DS(on) sensing,
OVP/UVP/UVLO and thermal shutdown protections.
TI offers the TPS51716 in a 20-pin, 3 mm × 3 mm,
QFN package and specifies it for an ambient
temperature range between –40°C and 85°C.
VIN
5VIN
PGND
12
TPS51716
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
UDG-12146
AGND PGND
AGND
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-CAP2, NexFET are trademarks of Texas Instruments.
2
PGND
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 © 2012, Texas Instruments Incorporated