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| 型号： | TPS51916EVM-746 |
| 厂商： | Texas Instruments |
| 文件页数： | 20/34页 |
| 文件大小： | 0K |
| 描述： | EVAL MODULE FOR TPS51916-746 |
| 标准包装： | 1 |
| 系列： | D-Cap™, D-Cap2™ |
| 主要目的： | 特殊用途 DC/DC，DDR 存储器电源 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.2 V ~ 1.5 V |
| 电流 - 输出： | 20A |
| 输入电压： | 8 ~ 20 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | TPS51916 |
| 其它名称： | 296-30054 TPS51916EVM-746-ND |
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TPS51916
SLUSAE1D – DECEMBER 2010 – REVISED JUNE 2012
VTT and VTTREF
TPS51916 integrates two high performance, low-drop-out linear regulators, VTT and VTTREF, to provide
complete DDR2/DDR3/DDR3L power solutions. The VTTREF has a 10-mA sink/source current capability, and
tracks ? of VDDQSNS with ±1% accuracy using an on-chip ? divider. A 0.22- μ F (or larger) ceramic capacitor
must be connected close to the VTTREF terminal to ensure stable operation. The VTT responds quickly to track
VTTREF within ±40 mV at all conditions, and the current capability is 2 A for both sink and source. A 10- μ F (or
larger) ceramic capacitor(s) need to be connected close to the VTT terminal for stable operation. To achieve tight
regulation with minimum effect of wiring resistance, a remote sensing terminal, VTTSNS, should be connected to
the positive node of VTT output capacitor(s) as a separate trace from the high-current line to the VTT pin.
(Please refer to the Layout Considerations section for details.)
When VTT is not required in the design, following treatment is strongly recommended.
?
?
?
?
?
?
Connect VLDOIN to VDDQ.
Tie VTTSNS to VTT, and remove capacitors from VTT to float.
Connect VTTGND to GND.
Select MODE2, 3, 4 or 5 shown in Table 2 (Select Non-tracking discharge mode).
Maintain a 0.22-μF capacitor connected at VTTREF.
Pull down S3 to GND with 1-k Ω resistance.
VIN
5VIN
12 V5IN
PGND
17 S3
TPS51916
VBST 15
DRVH 14
VDDQ
1 k W
S5
16 S5
SW 13
DRVL 11
PGND PGND
6
VREF
PGND 10
PGOOD 20
Powergood
8
7
REFIN
GND
VDDQSNS
VLDOIN
VTT
9
2
3
19 MODE
18 TRIP
VTTSNS
VTTGND
1
4
VTTREF
5
0.22 m F
AGND PGND
AGND
PGND
UDG-12075
Figure 38. Application Circuit When VTT Is Not Required
VDDQ Overvoltage and Undervoltage Protection
The TPS51916 sets the overvoltage protection (OVP) when VDDQSNS voltage reaches a level 20% (typ) higher
than the REFIN voltage. When an OV event is detected, the controller changes the output target voltage to 0 V.
This usually turns off DRVH and forces DRVL to be on. When the inductor current begins to flow through the
low-side MOSFET and reaches the negative OCL, DRVL is turned off and DRVH is turned on, for a minimum on-
time.
After the minimum on-time expires, DRVH is turned off and DRVL is turned on again. This action minimizes the
output node undershoot due to LC resonance. When the VDDQSNS reaches 0 V, the driver output is latched as
DRVH off, DRVL on. VTTREF and VTT are turned off and discharged using the non-tracking discharge
MOSFETs regardless of the tracking mode.
20
Copyright ? 2010–2012, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS51916EVM-746 | 制造商:Texas Instruments 功能描述:TPS51916, DC/DC CONVERTER, STEP DOWN, EV |
| TPS51916RUK | 制造商:TI 制造商全称:Texas Instruments 功能描述:Using the TPS51916EVM-746 Complete DDR2, DDR3 |
| TPS51916RUKR | 功能描述:直流/直流开关调节器 DDR2,DDR3 & DDR3L BUCK CONTROLLER RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS51916RUKT | 功能描述:直流/直流开关调节器 DDR2,DDR3 & DDR3L BUCK CONTROLLER RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS51980RTVR | 制造商:Texas Instruments 功能描述:DUAL PWM,99% MAX |
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