參數(shù)資料
型號(hào)： TPS5401DGQ
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封裝： GREEN, PLASTIC, MSOP-10
文件頁(yè)數(shù)： 5/41頁(yè)
文件大?。?/td> 1149K
代理商： TPS5401DGQ
V
ac
OUT
IL
V
PH
www.ti.com
SLVSAB0 – DECEMBER 2010
DETAILED DESCRIPTION (continued)
Figure 25. Pulse-Skip Mode Operation
Low-Dropout Operation and Bootstrap Voltage (BOOT)
The TPS5401 has an integrated boot regulator, and requires a small ceramic capacitor between the BOOT and
PH pins to provide the gate-drive voltage for the high-side MOSFET. The BOOT capacitor is refreshed when the
high-side MOSFET is off and the low-side diode conducts. The value of this ceramic capacitor should be 0.1 mF.
A ceramic capacitor with an X7R or X5R grade dielectric with a voltage rating of 10 V or higher is recommended
because of the stable characteristics over temperature and voltage.
To improve dropout, the TPS5401 is designed to operate at 100% duty cycle as long as the BOOT-to-PH pin
voltage is greater than 2.1 V. When the voltage from BOOT to PH drops below 2.1 V, the high-side MOSFET is
turned off using an UVLO circuit, which allows the low-side diode to conduct and refresh the charge on the
BOOT capacitor. Because the supply current sourced from the BOOT capacitor is low, the high-side MOSFET
can remain on for more switching cycles than are required to refresh the capacitor; thus, the effective duty cycle
of the switching regulator is high.
The effective duty cycle during dropout of the regulator is mainly influenced by the voltage drops across the
power MOSFET, inductor resistance, low-side diode, and printed circuit board resistance. During operating
conditions in which the input voltage drops and the regulator is operating in continuous conduction mode, the
high-side MOSFET can remain on for 100% of the duty cycle to maintain output regulation, until the BOOT-to-PH
voltage falls below 2.1 V.
Attention must be taken in maximum-duty-cycle applications which experience extended time periods with light
loads or no load. When the voltage across the BOOT capacitor falls below the 2.1-V UVLO threshold, the
high-side MOSFET is turned off, but there may not be enough inductor current to pull the PH pin down to
recharge the BOOT capacitor. The high-side MOSFET of the regulator stops switching because the voltage
across the BOOT capacitor is less than 2.1 V. The output capacitor then decays until the difference in the input
Copyright 2010, Texas Instruments Incorporated
13
Product Folder Link(s): TPS5401
相關(guān)PDF資料
PDF描述
TPS54040QDRCRQ1 SWITCHING REGULATOR, PDSO10
TPS54040QDGQRQ1 SWITCHING REGULATOR, PDSO10
TPS54060DRCT SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
TPS54060DGQR 0.94 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
TPS54060DRCR SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS5401DGQR 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 3.5V-42Vin,0.5A Step Down SWIFT RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
TPS5401DGQT 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 3.5V-42Vin,0.5A Step Down SWIFT RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
TPS5401EVM-708 功能描述:電源管理IC開(kāi)發(fā)工具 Eval Mod for TPS5401 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS5402 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.5-V TO 28-V INPUT VOLTAGE, 1.7-A OUTPUT CURRENT, NON-SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED MOSFET
TPS54020 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 10A Synchronous Step-Down SWIFTa?￠ Converter With Full Feature Set
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*