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參數(shù)資料
| 型號： | LP2954A |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 5V and Adjustable Micropower Low-Dropout Voltage Regulators |
| 中文描述： | 5V和可調(diào)微功率低壓差穩(wěn)壓器 |
| 文件頁數(shù)： | 5/13頁 |
| 文件大?。?/td> | 336K |
| 代理商： | LP2954A |
Electrical Characteristics
(Continued)
TABLE 1. Typical Values of Case-to-Heatsink
Thermal Resistance (C/W) (Data from AAVID Eng.)
Silicone grease
Dry interface
Mica with grease
1.0
1.3
1.4
TABLE 2. Typical Values of Case-to-Heatsink
Thermal Resistance (C/W) (Data from Thermalloy)
Thermasil III
Thermasil II
Thermalfilm (0.002) with grease
1.3
1.5
2.2
Note 3:
Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 4:
Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested separately for load regulation in the load
ranges 0.1 mA–1 mA and 1 mA–250 mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Note 5:
Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below the value measured with a 1V differential.
Note 6:
Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus the ground pin current.
Note 7:
Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation
effects. Specifications are for 200 mA load pulse at V
IN
= 20V (3W pulse) for T = 10 ms.
Note 8:
When used in dual-supply systems where the regulator load is returned to a negative supply, the output voltage must be diode-clamped to ground.
Note 9:
Connect a 0.1μF capacitor from the output to the feedback pin.
Note 10:
V
REF
≤
V
OUT
≤
(V
IN
1V), 2.3V
≤
V
IN
≤
30V, 100μA
≤
I
L
≤
250mA.
Note 11:
Two seperate tests are performed, one covering V
IN
=2.5V to V
O
(NOM)+1V and the other test for V
IN
=2.5V to V
O
(NOM)+1V to 30V.
Note 12:
V
SHUTDOWN
≤
1.1V, VOUT=V
O
(NOM).
Note 13:
Comparator thresholds are expressed in terms of a voltage differential at the Feedback terminal below the nominal reference voltage measured at
V
IN
=V
O
(NOM)+1V. To express these thresholds in terms of output voltage change, multiply by the Error amplifier gain, which is V
OUT
/V
REF
=(R1+R2)/R2.
Note 14:
Human body model, 200pF discharged through 1.5k
.
Typical Performance Characteristics
Quiescent Current
DS011128-12
Quiescent Current
DS011128-13
Ground Pin Current vs Load
DS011128-14
Ground Pin Current
DS011128-15
Ground Pin Current
DS011128-16
Output Noise Voltage
DS011128-17
www.national.com
5
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP2954AIM | 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2954AIM/NOPB | 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2954AIM/NOPB | 制造商:Texas Instruments 功能描述:Voltage Regulator IC |
| LP2954AIMX | 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2954AIMX/NOPB | 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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