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參數(shù)資料
| 型號： | LM2991T |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Negative Low Dropout Adjustable Regulator |
| 中文描述： | 3 V-24 V ADJUSTABLE NEGATIVE LDO REGULATOR, 1 V DROPOUT, PSFM5 |
| 封裝： | STRAIGHT, TO-220, 5 PIN |
| 文件頁數(shù)： | 1/11頁 |
| 文件大?。?/td> | 338K |
| 代理商： | LM2991T |
LM2991
Negative Low Dropout Adjustable Regulator
General Description
The LM2991 is a low dropout adjustable negative regulator
with a output voltage range between 3V to 24V. The
LM2991 provides up to 1A of load current and features a On
/Off pin for remote shutdown capability.
The LM2991 uses new circuit design techniques to provide a
low dropout voltage, low quiescent current and low tempera-
ture coefficient precision reference. The dropout voltage at
1A load current is typically 0.6V and a guaranteed
worst-case maximum of 1V over the entire operating tem-
perature range. The quiescent current is typically 1 mA with
a 1A load current and an input-output voltage differential
greater than 3V. A unique circuit design of the internal bias
supply limits the quiescent current to only 9 mA (typical)
when the regulator is in the dropout mode (V
OUT
V
IN
≤
3V).
The LM2991 is short-circuit proof, and thermal shutdown in-
cludes hysteresis to enhance the reliability of the device
when inadvertently overloaded for extended periods. The
LM2991 is available in 5-lead TO-220 and TO-263 packages
and is rated for operation over the automotive temperature
range of 40C to +125C. Mil-Aero versions are also avail-
able.
Features
n
Output voltage adjustable from 3V to 24V, typically
2V to 25V
n
Output current in excess of 1A
n
Dropout voltage typically 0.6V at 1A load
n
Low quiescent current
n
Internal short circuit current limit
n
Internal thermal shutdown with hysteresis
n
TTL, CMOS compatible ON/OFF switch
n
Functional complement to the LM2941 series
Applications
n
Post switcher regulator
n
Local, on-card, regulation
n
Battery operated equipment
Typical Application
DS011260-1
V
OUT
= V
REF
(1 + R2/R1)
*Required if the regulator is located further than 6 inches from the power supply filter capacitors. A 1 μF solid tantalum or a 10 μF aluminum electrolytic
s*Required for stability. Must be at least a 10 μF aluminum electrolytic or a 1 μF solid tantalum to maintain stability. May be increased without bound to
over the same operating temperature range as the regulator.
May 1999
L
1999 National Semiconductor Corporation
DS011260
www.national.com
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM2991S | Negative Low Dropout Adjustable Regulator |
| LM2991 | Negative Low Dropout Adjustable Regulator |
| LM3-EWN1-01-N2 | SMD LED |
| LM3-PBG1-01-N1 | SMD LED |
| LM3-PBL1-01-N1 | SMD LED |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2991T | 制造商:Texas Instruments 功能描述:V REG ADJ -2/25V 2991 TO-220-5 |
| LM2991T/LB01 | 制造商:Texas Instruments 功能描述:LDO Regulator Neg -3V to -24V 1A 5-Pin(5+Tab) TO-220 Rail |
| LM2991T/LB02 | 制造商:Texas Instruments 功能描述:LDO Regulator Neg -3V to -24V 1A 5-Pin(5+Tab) TO-220 Rail |
| LM2991T/LB03 | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LM2991T/LF03 | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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