參數(shù)資料
型號(hào)： TPS62260DDC
廠商： Texas Instruments, Inc.
英文描述： 2.25 MHz 600 mA Step Down Converter in 2x2SON/TSOT-23 Package
中文描述： 2.25兆赫600毫安降壓轉(zhuǎn)換器2x2SON/TSOT-23包
文件頁(yè)數(shù)： 19/32頁(yè)
文件大?。?/td> 951K
代理商： TPS62260DDC
www.ti.com
V
IN
GND
EN
FB
SW
TPS62261DRV
L1
2.2 μH
C
IN
4.7μF
C
OUT
10 μF
V
OUT
1.8 V
600 mA
MODE
V
IN
=
2.3V to 6V
OUTPUT VOLTAGE SETTING
The output voltage can be calculated to:
V
OUT
V
REF
1
R
1
R
2
with an internal reference voltage V
REF
typical 0.6V.
OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR)
The TPS62260 is designed to operate with inductors in the range of 1.5
μ
H to 4.7
μ
H and with output capacitors
in the range of 4.7
μ
F to 22
μ
F. The part is optimized for operation with a 2.2
μ
H inductor and 10
μ
F output
capacitor.
Inductor Selection
I
L
Vout
1
Vout
Vin
L
(1)
TPS62260, TPS62261, TPS62262
SLVS763–JUNE 2007
APPLICATION INFORMATION (continued)
Figure 38. TPS62261 Fixed 1.8-V Output
To minimize the current through the feedback divider network, R
2
should be 180 k
or 360 k
. The sum of R
1
and R
2
should not exceed ~1M
, to keep the network robust against noise. An external feed forward capacitor
C
1
is required for optimum load transient response. The value of C
1
should be in the range between 22pF and
33pF.
Route the FB line away from noise sources, such as the inductor or the SW line.
Larger or smaller inductor values can be used to optimize the performance of the device for specific operation
conditions. For stable operation, the L and C values of the output filter may not fall below 1
μ
H effective
inductance and 3.5
μ
F effective capacitance.
The inductor value has a direct effect on the ripple current. The selected inductor has to be rated for its dc
resistance and saturation current. The inductor ripple current (
I
L
) decreases with higher inductance and
increases with higher V
I
or V
O
.
The inductor selection has also impact on the output voltage ripple in PFM mode. Higher inductor values will
lead to lower output voltage ripple and higher PFM frequency, lower inductor values will lead to a higher output
voltage ripple but lower PFM frequency.
Equation 1
calculates the maximum inductor current in PWM mode under static load conditions. The saturation
current of the inductor should be rated higher than the maximum inductor current as calculated with
Equation 2
.
This is recommended because during heavy load transient the inductor current will rise above the calculated
value.
19
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TPS62260DDCR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.25MHz 600mA Step- Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS62260DDCRG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.25MHz 600mA Step- Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS62260DDCT 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.25MHz 600mA Step- Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS62260DDCTG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.25MHz 600mA Step- Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS62260DRVR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.25MHz 600mA Step- Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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