參數(shù)資料
型號(hào)： TPS54260DGQR
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 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)： 25/49頁(yè)
文件大小： 1808K
代理商： TPS54260DGQR
2
Iout
Cout >
sw
Vout
D
D
(
)
(
)
2
Ioh
Iol
Cout > Lo
V
Vi
-
-
1
ORIPPLE
RIPPLE
Cout >
V
8
sw
I
ORIPPLE
ESR
RIPPLE
V
R
I
<
Vout
(Vin max
Vout)
Icorms =
12
Vin max
Lo
sw
-
(
)
2
-
Cj
sw
Vin + Vd
(Vin max
Vout)
Iout
Vd
Pd =
+
2
Vin max
www.ti.com
SLVSA86A – MARCH 2010 – REVISED DECEMBER 2010
Capacitors generally have limits to the amount of ripple current they can handle without failing or producing
excess heat. An output capacitor that can support the inductor ripple current must be specified. Some capacitor
data sheets specify the Root Mean Square (RMS) value of the maximum ripple current. Equation 36 can be used
to calculate the RMS ripple current the output capacitor needs to support. For this application, Equation 36 yields
238 mA.
(32)
(33)
(34)
(35)
(36)
Catch Diode
The TPS54260 requires an external catch diode between the PH pin and GND. The selected diode must have a
reverse voltage rating equal to or greater than Vinmax. The peak current rating of the diode must be greater than
the maximum inductor current. The diode should also have a low forward voltage. Schottky diodes are typically a
good choice for the catch diode due to their low forward voltage. The lower the forward voltage of the diode, the
higher the efficiency of the regulator.
Typically, the higher the voltage and current ratings the diode has, the higher the forward voltage will be.
Although the design example has an input voltage up to 13.2V, a diode with a minimum of 60V reverse voltage is
selected to allow input voltage transients up to the rated voltage of the TPS54260.
For the example design, the B360B-13-F Schottky diode is selected for its lower forward voltage and it comes in
a larger package size which has good thermal characteristics over small devices. The typical forward voltage of
the B360B-13-F is 0.70 volts.
The diode must also be selected with an appropriate power rating. The diode conducts the output current during
the off-time of the internal power switch. The off-time of the internal switch is a function of the maximum input
voltage, the output voltage, and the switching frequency. The output current during the off-time is multiplied by
the forward voltage of the diode which equals the conduction losses of the diode. At higher switch frequencies,
the ac losses of the diode need to be taken into account. The ac losses of the diode are due to the charging and
discharging of the junction capacitance and reverse recovery. Equation 37 is used to calculate the total power
dissipation, conduction losses plus ac losses, of the diode.
The B360B-13-F has a junction capacitance of 200 pF. Using Equation 37, the selected diode will dissipate 1.32
Watts.
If the power supply spends a significant amount of time at light load currents or in sleep mode consider using a
diode which has a low leakage current and slightly higher forward voltage drop.
(37)
Copyright 2010, Texas Instruments Incorporated
31
Product Folder Link(s): TPS54260
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TPS54260DRCR 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 3.5V-60Vin,2.5A,2.5 MHz 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
TPS54260DRCT 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 3.5V-60Vin,2.5A,2.5 MHz 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
TPS54260EVM-597 功能描述:電源管理IC開(kāi)發(fā)工具 2.5A,10.8-13.2Vin SWIFT Conv Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS54260MDGQTEP 功能描述:IC REG BUCK ADJ 2.5A 10MOSP 制造商:texas instruments 系列:Eco-Mode? 包裝:剪切帶（CT） 零件狀態(tài):在售 功能:降壓 輸出配置:正 拓?fù)?降壓 輸出類(lèi)型:可調(diào)式 輸出數(shù):1 電壓 - 輸入（最小值）:3.5V 電壓 - 輸入（最大值）:60V 電壓 - 輸出（最小值/固定）:0.8V 電壓 - 輸出（最大值）:60V 電流 - 輸出:2.5A 頻率 - 開(kāi)關(guān):100kHz ~ 2.5MHz 同步整流器:無(wú) 工作溫度:-40°C ~ 150°C（TJ） 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 供應(yīng)商器件封裝:10-MSOP-PowerPad 標(biāo)準(zhǔn)包裝:1
TPS54260MDRCTEP 功能描述:IC REG BUCK ADJ 2.5A 10VSON 制造商:texas instruments 系列:Eco-Mode? 包裝:剪切帶（CT） 零件狀態(tài):在售 功能:降壓 輸出配置:正 拓?fù)?降壓 輸出類(lèi)型:可調(diào)式 輸出數(shù):1 電壓 - 輸入（最小值）:3.5V 電壓 - 輸入（最大值）:60V 電壓 - 輸出（最小值/固定）:0.8V 電壓 - 輸出（最大值）:60V 電流 - 輸出:2.5A 頻率 - 開(kāi)關(guān):100kHz ~ 2.5MHz 同步整流器:無(wú) 工作溫度:-40°C ~ 150°C（TJ） 安裝類(lèi)型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤(pán) 供應(yīng)商器件封裝:10-VSON（3x3） 標(biāo)準(zhǔn)包裝:1
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