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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)： | 12/24頁 |
| 文件大?。?/td> | 709K |
| 代理商： | TPS62227DDC |
www.ti.com
LOW DROPOUT OPERATION 100% DUTY CYCLE
The TPS6222x offers a low input to output voltage difference, while still maintaining operation with the 100% duty
cycle mode. In this mode, the P-channel switch is constantly turned on. This is particularly useful in
battery-powered applications to achieve longest operation time by taking full advantage of the whole battery
voltage range. The minimum input voltage to maintain regulation, depending on the load current and output
voltage, can be calculated as:
V min=V max+I maxxr
max+R
I
O
O
DS(on)
L
()
ENABLE
Pulling the enable low forces the part into shutdown, with a shutdown quiescent current of typically 0.1 μA. In this
mode, the P-channel switch and N-channel rectifier are turned off, the internal resistor feedback divider is
disconnected, and the whole device is in shutdown mode. If an output voltage, which could be an external
voltage source or super capacitor, is present during shutdown, the reverse leakage current is specified under
electrical characteristics. For proper operation, the enable pin must be terminated and must not be left floating.
UNDERVOLTAGE LOCKOUT
The undervoltage lockout circuit prevents the device from misoperation at low input voltages. It prevents the
converter from turning on the switch or rectifier MOSFET under undefined conditions.
TPS62220, TPS62221, TPS62222
TPS62223, TPS62224, TPS62227
TPS62228, TPS62229
SLVS491D–SEPTEMBER 2003–REVISED MARCH 2006
DETAILED DESCRIPTION (continued)
where:
I
O
max = maximum output current plus indicator ripple current
r
DS(on)
max = maximum P-channel switch r
DS(on)
R
L
= dc resistance of the inductor
V
O
max = normal output voltage plus maximum output voltage tolerance
Pulling the enable high starts up the TPS6222x with the soft start as previously described.
12
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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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