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參數資料
| 型號： | TPS54519RTER |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 8 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, WQFN-16 |
| 文件頁數： | 33/33頁 |
| 文件大小： | 1269K |
| 代理商： | TPS54519RTER |
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Vsense (Good) Falling
Vsense (Fault) Rising
Vsense (Good) Falling
-40
-10
20
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80
110
140
T - Junction Temperature - °C
J
PWRGD
Threshold
-
%
V
ref
SLVSAT3
– SEPTEMBER 2011
TYPICAL CHARACTERISTICS CURVES (continued)
PWRGD THRESHOLD vs TEMPERATURE
Figure 15.
OVERVIEW
The TPS54519 is a 6-V, 5-A, synchronous step-down (buck) converter with two integrated n-channel MOSFETs.
To improve performance during line and load transients the device implements a constant frequency, peak
current mode control which reduces output capacitance and simplifies external frequency compensation design.
The wide switching frequency of 200 kHz to 2000 kHz allows for efficiency and size optimization when selecting
the output filter components. The switching frequency is adjusted using a resistor to ground on the RT pin.
The TPS54519 has a typical default start up voltage of 2.6 V. The EN pin has an internal pull-up current source
that can be used to adjust the input voltage under voltage lockout (UVLO) with two external resistors. In addition,
the pull up current provides a default condition when the EN pin is floating for the device to operate. The total
operating current for the TPS54519 is 455
μA when not switching and under no load. When the device is
disabled, the supply current is less than 5
μA.
The integrated 30 m
MOSFETs allow for high efficiency power supply designs with continuous output currents
up to 5 amperes.
The TPS54519 reduces the external component count by integrating the boot recharge diode. The bias voltage
for the integrated high side MOSFET is supplied by a capacitor on the BOOT to PH pin. The boot capacitor
voltage is monitored by an UVLO circuit and turns off the high side MOSFET when the voltage falls below a
preset threshold. This BOOT circuit allows the TPS54519 to operate approaching 100%. The output voltage can
be stepped down to as low as the 0.6 V reference.
The TPS54519 has a power good comparator (PWRGD) with 2% hysteresis.
The TPS54519 minimizes excessive output overvoltage transients by taking advantage of the overvoltage power
good comparator. When the regulated output voltage is greater than 107% of the nominal voltage, the
overvoltage comparator is activated, and the high side MOSFET is turned off and masked from turning on until
the output voltage is lower than 105%.
The SS/TR pin is used to minimize inrush currents or provide power supply sequencing during power up. A small
value capacitor should be coupled to the pin for slow start. The SS/TR pin is discharged before the output power
up to ensure a repeatable restart after an over-temperature fault, UVLO fault or disabled condition.
The use of a frequency foldback circuit reduces the switching frequency during startup and over current fault
conditions to help limit the inductor current.
Copyright
2011, Texas Instruments Incorporated
9
Product Folder Link(s): TPS54519
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS54519RTET | 功能描述:直流/直流開關調節器 2.95-6VIN,5A SYNC STEP-DOWN CONVERTER RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54521 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 5A Synchronous Step Down SWIFT? Converter |
| TPS54521_1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 5A Synchronous Step Down SWIFT? Converter |
| TPS54521EVM-607 | 功能描述:電源管理IC開發工具 TPS54521 Eval Mod 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 |
| TPS54521RHL | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 5A Synchronous Step Down SWIFT? Converter |
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