參數(shù)資料
型號： LP2985AIM5-1.5
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 基準電壓源/電流源
英文描述： Quad Precision Single Supply uPower Operational Amplifier 14-SOIC 0 to 70
中文描述： 1.5 V FIXED POSITIVE LDO REGULATOR, 0.6 V DROPOUT, PDSO5
封裝： SOT-23, 5 PIN
文件頁數(shù)： 10/23頁
文件大?。?/td> 528K
代理商： LP2985AIM5-1.5
SLVS522C JULY 2004 REVISED OCTOBER 2004
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
capacitors
input capacitor (C
in
)
A minimum value of 1 F (over the entire operating temperature range) is required at the input of the LP2985.
In addition, this input capacitor should be located within 1 cm of the input pin and connected to a clean analog
ground. There are no Equivalent Series Resistance (ESR) requirements for this capacitor, and the capacitance
can be increased without limit.
output capacitor (C
out
)
As an advantage over other regulators, the LP2985 permits the use of low-ESR capacitors at the output,
including ceramic capacitors that can have an ESR as low as 5 m
. Tantalum and film capacitors also can be
used if size and cost are not issues. The output capacitor also should be located within 1 cm of the output pin
and be returned to a clean analog ground.
As with other PNP LDOs, stability conditions require the output capacitor to have a minimum capacitance and
an ESR that falls within a certain range.
Minimum C
out
: 2.2
μ
F (can be increased without limit to improve transient response stability margin)
ESR range: see Figure 1
E
Load Current mA
Figure 1. 2.2-V/3.3-
μ
F ESR Curves
It is critical that both the minimum capacitance and ESR requirement be met
over the entire operating
temperature range.
Depending on the type of capacitors used, both these parameters can vary significantly with
temperature (see capacitor characteristics section).
noise bypass capacitor (C
bypass
)
The LP2985 allows for low-noise performance with the use of a bypass capacitor that is connected to the internal
bandgap reference via the BYPASS pin. This high-impedance bandgap circuitry is biased in the microampere
range and, thus, cannot be loaded significantly, otherwise, its output and, correspondingly, the output of the
regulator will change. Thus, for best output accuracy, dc leakage current through C
bypass
should be minimized
as much as possible and never should exceed 100 nA.
A 10-nF capacitor is recommended for C
bypass
; ceramic and film capacitors are well suited for this purpose.
相關PDF資料
PDF描述
LP2985AIM5X-3.2 Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator Designed for Use with Very Low ESR Output Capacitors
LP2985AIM5X-3.3 Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator Designed for Use with Very Low ESR Output Capacitors
LP2985AIM5X-3.5 Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator Designed for Use with Very Low ESR Output Capacitors
LP2985AIM5X-3.6 Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator Designed for Use with Very Low ESR Output Capacitors
LP2985AIM5X-3.8 Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator Designed for Use with Very Low ESR Output Capacitors
相關代理商/技術參數(shù)
參數(shù)描述
LP2985AIM518 制造商:NATIONAL 功能描述:*
LP2985AIM5-2.0 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
LP2985AIM5-2.0/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
LP2985AIM5-2.0/NOPB 制造商:Texas Instruments 功能描述:Voltage Regulator IC
LP2985AIM5-2.5 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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