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參數資料
| 型號： | L5981 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩壓器 |
| 英文描述： | 1 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 3 X 3 MM, 1.08 MM HEIGHT, LEAD FREE, VFQFPN-8 |
| 文件頁數： | 1/37頁 |
| 文件大小： | 714K |
| 代理商： | L5981 |
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June 2009
Doc ID 13004 Rev 6
1/37
37
L5981
1 A step-down switching regulator
Features
■ 1 A DC output current
■ 2.9 V to 18 V input voltage
■ Output voltage adjustable from 0.6 V
■ 250 kHz switching frequency, programmable
up to 1 MHz
■ Internal soft-start and inhibit
■ Low dropout operation: 100 % duty cycle
■ Voltage feed-forward
■ Zero load current operation
■ Overcurrent and thermal protection
■ VFQFPN8 3 mm x 3 mm package
Applications
■ Consumer: STB, DVD, DVD recorder, car
audio, LCD TV and monitors
■ Industrial: chargers, PLD, PLA, FPGA
■ Networking: XDSL, modems, DC-DC modules
■ Computer: optical storage, hard disk drive,
printers, audio/graphic cards
■ LED driving
Description
The L5981 is step-down switching regulator with
1.5 A (min.) current limited embedded power
MOSFET, so it is able to deliver in excess of 1 A
DC current to the load depending on the
application condition.
The input voltage can range from 2.9 V to 18 V,
while the output voltage can be set starting from
0.6 V to VIN. Having a minimum input voltage of
2.9 V, the device is suitable also for 3.3 V bus.
Requiring a minimum set of external components,
the device includes an internal 250 kHz switching
frequency oscillator that can be externally
adjusted up to 1 MHz.
The VFQFPN8 package with exposed pad allows
reducing the RthJA down to approximately
60 °C/W.
VFQFPN8 3 mm x 3 mm
Figure 1.
Application circuit
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| L5981TR | 1 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
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| L5985TR | 2 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| L5989DTR | 5.06 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| L5981_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1 A step-down switching regulator |
| L5981TR | 功能描述:直流/直流開關調節器 1a Step-Down Switching Reg RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5983 | 功能描述:直流/直流開關調節器 1.5A STEP-DOWN SWITCHING REGULATOR RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5983_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.5 A step-down switching regulator |
| L5983TR | 功能描述:直流/直流開關調節器 1.5a Step-Down Switching Reg RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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