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參數資料
| 型號： | TPS51200DRCT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO10 |
| 封裝： | GREEN, PLASTIC, VSON-10 |
| 文件頁數： | 35/35頁 |
| 文件大小： | 1131K |
| 代理商： | TPS51200DRCT |
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APPLICATION INFORMATION
VIN CAPACITOR
VLDO INPUT CAPACITOR
OUTPUT CAPACITOR
Low VIN Applications
S3 and Pseudo-S5 Support
Tracking Startup and Shutdown
SLUS812 – FEBRUARY 2008
Add a ceramic capacitor, with a value between 1.0-
F and 4.7-F, placed close to the VIN pin, to stabilize the
bias supply (2.5- V rail or 3.3- V rail) from any parasitic impedance from the supply.
Depending on the trace impedance between the VLDOIN bulk power supply to the device, a transient increase of
source current is supplied mostly by the charge from the VLDOIN input capacitor. Use a 10-
F (or greater)
ceramic capacitor to supply this transient charge. Provide more input capacitance as more output capacitance is
used at VO. In general, use one-half of the COUT value for input.
For stable operation, the total capacitance of the VO output terminal must be greater than 20
F. Attach three,
10-
F ceramic capacitors in parallel to minimize the effect of equivalent series resistance (ESR) and equivalent
series inductance (ESL). If the ESR is greater than 2 m
, insert an R-C filter between the output and the VOSNS
input to achieve loop stability. The R-C filter time constant should be almost the same as or slightly lower than
the time constant of the output capacitor and its ESR.
TPS51200 can be used in an application system where either a 2.5-V rail or a 3.3-V rail is available. If only a 5-V
rail is available, TPS51100 can be used instead. The TPS51200 minimum input voltage requirement is 2.375 V.
If a 2.5-V rail is used, ensure that the absolute minimum voltage (both DC and transient) at the device pin is be
2.375 V or greater. The voltage tolerance for a 2.5-V rail input is between –5% and 5% accuracy, or better.
The TPS51200 provides S3 support by an EN function. The EN pin could be connected to an SLP_S3 signal in
the end application. Both REFOUT and VO are on when EN = high (S0 state). REFOUT is maintained while VO
is turned off and discharged via an internal discharge MOSFET when EN = low (S3 state). When EN = low and
the REFIN voltage is less than 0.390 V, TPS51200 enters pseudo-S5 state. Both VO and REFOUT outputs are
turned off and discharged to GND through internal MOSFETs when pseudo-S5 support is engaged (S4/S5
state). Figure 1 shows a typical startup and shutdown timing diagram for an application that uses S3 and
pseudo-S5 support.
The TPS51200 also supports tracking startup and shutdown when EN is tied directly to the system bus and not
used to turn on or turn off the device. During tracking startup, VO follows REFOUT once REFIN voltage is
greater than 0.39 V. REFIN follows the rise of VDDQ rail via a voltage divider. The typical soft-start time for the
VDDQ rail is approximately 3 ms, however it may vary depending on the system configuration. The SS time of
the VO output no longer depends on the OCL setting, but it is a function of the SS time of the VDDQ rail.
PGOOD is asserted 2 ms after VO is within ±20% of REFOUT. During tracking shutdown, VO falls following
REFOUT until REFOUT reaches 0.37 V. Once REFOUT falls below 0.37 V, the internal discharge MOSFETs are
turned on and quickly discharge both REFOUT and VO to GND. PGOOD is deasserted once VO is beyond the
±20% range of REFOUT. Figure 2 shows the typical timing diagram for an application that uses tracking startup
and shutdown.
Copyright 2008, Texas Instruments Incorporated
9
Product Folder Link(s): TPS51200
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相關代理商/技術參數 |
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| TPS51200DRCT | 制造商:Texas Instruments 功能描述:IC DDR TERMINATION REGULATOR 3A SON10 制造商:Texas Instruments 功能描述:IC, DDR TERMINATION REGULATOR, 3A, SON10 |
| TPS51200DRCTG4 | 功能描述:低壓差穩壓器 - LDO Sink/Source DDR Term Reg RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS51200EVM | 功能描述:電源管理IC開發工具 TPS51200 Sink Source DDR Term Reg RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS51200MDRCTEP | 功能描述:- Converter, DDR Voltage Regulator IC 1 Output 10-VSON (3x3) 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態:新產品 應用:轉換器，DDR 電壓 - 輸入:2.38 V ~ 3.5 V 輸出數:1 電壓 - 輸出:- 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應商器件封裝:10-VSON（3x3） 標準包裝:1 |
| TPS51200-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SINK/SOURCE DDR TERMINATION REGULATOR |
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