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參數(shù)資料
| 型號： | TPS62227DDC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23 |
| 中文描述： | 400毫安，1.25 MHz的，高效率，降壓型轉(zhuǎn)換器薄，SOT23封裝 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 709K |
| 代理商： | TPS62227DDC |
www.ti.com
INPUT CAPACITOR SELECTION
Because buck converters have a pulsating input current, a low ESR input capacitor is required. This results in the
best input voltage filtering, minimizing the interference with other circuits caused by high input voltage spikes.
Also, the input capacitor must be sufficiently large to stabilize the input voltage during heavy load transients. For
good input voltage filtering, usually a 4.7-μF input capacitor is sufficient. It can be increased without any limit for
better input-voltage filtering. Ceramic capacitors show better performance because of the low ESR value, and
they are less sensitive against voltage transients and spikes compared to tantalum capacitors. Place the input
capacitor as close as possible to the input and GND pin of the device for best performance (see
Table 4
for
capacitor selection).
OUTPUT CAPACITOR SELECTION
The advanced fast response voltage mode control scheme of the TPS6222x allows the use of tiny ceramic
capacitors with a minimum value of 10 μF without having large output voltage under and overshoots during
heavy load transients. Ceramic capacitors with low ESR values have the lowest output voltage ripple and are
recommended. If required, tantalum capacitors may be used as well (see
Table 4
for capacitor selection). At
nominal load current, the device operates in power-save mode, and the output voltage ripple is independent of
the output capacitor value. The output voltage ripple is set by the internal comparator thresholds. The typical
output voltage ripple is 1% of the output voltage V
O
.
TPS62220, TPS62221, TPS62222
TPS62223, TPS62224, TPS62227
TPS62228, TPS62229
SLVS491D–SEPTEMBER 2003–REVISED MARCH 2006
Table 3. Inductor Selection
INDUCTOR VALUE
4.7 μH
4.7 μH
4.7 μH
4.7 μH
4.7 μH
4.7 μH
4.7 μH
6.8 μH
6.8 μH
10 μH
10 μH
10 μH
COMPONENT SUPPLIER
Sumida CDRH2D18/LD 4R7
Murata LQH3C4R7M24
Taiyo Yuden LBC2518 4R7
Sumida CMD4D11 4R7
Sumida CMD4D08 4R7
Sumida CLSD09 4R7
TDK VLF3010AT 4R7
Sumida CDRH3D16 6R8
Sumida CMD4D11 4R7
Murata LQH4C100K04
Sumida CDRH3D16 100
Sumida CLS4D14 100
DIMENSIONS
3,2 mm × 3,2 mm × 2, 0 mm
3,2 mm × 2,5 mm × 2, 0 mm
2,5 mm × 1,8 mm × 1,8 mm
4,4 mm × 5,8 mm × 1,2 mm
6,3 mm × 5,8 mm × 1, 0 mm
4,9 mm × 4,9 mm × 1, 0 mm
2,8 mm × 2,6 mm × 1, 0 mm
4,0 mm × 4,0 mm × 1,8 mm
4,0 mm × 5,8 mm × 1,2 mm
4,5 mm × 3,2 mm × 2, 6 mm
4,0 mm × 4,0 mm × 1,8 mm
4,9 mm × 4,9 mm × 1,5 mm
Table 4. Capacitor selection
CAPACITOR VALUE
4.7 μF
4.7 μF
CASE SIZE
0603
0805
COMPONENT SUPPLIER
Contact TDK
Taiyo Yuden JMK212BY475MG
Taiyo Yuden JMK212BJ106MG
TDK C12012X5ROJ106K
Contact TDK
Taiyo Yuden JMK316BJ226
10 μF
0805
0805
1206
22 μF
15
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| TPS62227DDCR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2V Out 400mA 95% Eff Step-Down Cnvrtr 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 |
| TPS62227DDCRG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2V Out 400mA 95% Eff Step-Down Cnvrtr 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 |
| TPS62227DDCT | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2VOtp 400mA95%Eff Cnvrtr15uA ThinSOT23 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 |
| TPS62227DDCTG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2V Out 400mA 95% Eff Step-Down Cnvrtr 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 |
| TPS62228DDCR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.875V Out 400mA 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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