Texas Instruments TPS65295, Руководство пользователя, Страница: 2 / 20

Introduction
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2 SLUUC02 – February 2019
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Copyright © 2019, Texas Instruments Incorporated
TPS65295EVM-079, 4.5-V to 18-V
IN
, complete DDR4 power solution
evaluation module
3 Jumpers
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4
4 Connection and Test Points
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4
5 List of Materials
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14
1 Introduction
The TPS65295 device provides a complete power solution for DDR4 memory system with the lowest total
cost and minimum space. It meets the JEDEC standard for DDR4 power-up and power-down sequence
requirement. The TPS65295 integrates two synchronous buck converters (VPP and VDDQ) and a 1-A
sink and source tracking LDO (VTT) and a buffered low noise reference (VTTREF).
Table 1 displays
detailed input and output information.
The TPS65295 employs D-CAP3™ mode coupled with 600-kHz switching frequency for ease-of-use, fast
transient, and support for ceramic output capacitors without an external compensation circuit. The
VTTREF tracks ½ VDDQ within excellent 0.8% accuracy. The VTT which provides both 1-A sink and
source continual current capabilities requires only 10-
μ
F of ceramic output capacitor.
The TPS65295 provides rich 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 in S4/S5
state. OVP, UVP, OCP, UVLO and thermal shutdown protections are also available. The part is available
in a thermally enhanced 18-pin HotRod™ VQFN package and is designed to operate under the –40°C to
125°C junction temperature range.
The evaluation module is designed to provide access to the features of the TPS65295. Some
modifications can be made to this module to test performance at different input and output voltages,
current and switching frequency. Please contact TI Field Applications Group for advice on these matters.
Table 1. Input Voltage and Output Current Summary
EVM INPUT VOLTAGE (V
IN
) Range OUTPUT CURRENT (I
OUT
) RANGE
TPS65295EVM-079 4.5 V to 18 V I
VDDQ
= 0 A to 8 A, I
VPP
= 0 A to 1 A, I
VTT
= 0 A to 1 A
2 Performance Specification Summary
A summary of the TPS65295EVM-079 performance specifications is provided in Table 2 . The
TPS65295EVM-079 is designed and tested for VIN = 4.5 V to 18V. The Junction temperature is 25°C for
all measurements, unless otherwise noted.
Table 2. TPS65295EVM-079 Performance Specifications Summary
PARAMETER TEST CONDITION MIN TYP MAX UNIT
V
IN
Input Voltage Range 4.5 18 V
I
OUT
Output Current(VDDQ) 0 8
A
Output Current(VPP) 0 1
Output Current(VTT) 0 1
Output Current(VTTREF) 0 0.01
F
SW
Switching Frequency(VDDQ) 600
KHz
Switching Frequency(VPP) 580
V
OUT
VDDQ 1.188 1.2 1.212
V
VPP 2.45 2.5 2.55
VTT VTTREF
VTTREF 1/2VDDQ