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參數(shù)資料
| 型號： | LM34919BQTLX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PBGA10 |
| 封裝： | MICRO, SMD-10 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 488K |
| 代理商： | LM34919BQTLX |
Pin Descriptions
Pin Number
Name
Description
Application Information
A1
RON/SD
On-time control and shutdown
An external resistor from VIN to this pin sets the buck switch
on-time. Grounding this pin shuts down the regulator.
A2
RTN
Circuit Ground
Ground for all internal circuitry other than the current limit
detection.
A3
FB
Feedback input from the regulated
output
Internally connected to the regulation and over-voltage
comparators. The regulation level is 2.5V.
B1
SGND
Sense Ground
Re-circulating current flows into this pin to the current sense
resistor.
B3
SS
Softstart
An internal current source charges an external capacitor to
2.5V, providing the softstart function.
C1
ISEN
Current sense
The re-circulating current flows through the internal sense
resistor, and out of this pin to the free-wheeling diode.
Current limit is nominally set at 0.64A.
C3
VCC
Output from the startup regulator
Nominally regulated at 7.0V. An external voltage (7V-14V)
can be applied to this pin to reduce internal dissipation. An
internal diode connects VCC to VIN.
D1
VIN
Input supply voltage
Nominal input range is 6.0V to 40V.
D2
SW
Switching Node
Internally connected to the buck switch source. Connect to
the inductor, free-wheeling diode, and bootstrap capacitor.
D3
BST
Boost pin for bootstrap capacitor
Connect a 0.022 F capacitor from SW to this pin. The
capacitor is charged from V
CC via an internal diode during
each off-time.
3
www.national.com
LM34919B
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM34919BQTLX/NOPB | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 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 |
| LM34919BTL | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator |
| LM34919BTL/NOPB | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 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 |
| LM34919BTLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator |
| LM34919BTLX/NOPB | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 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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