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參數(shù)資料
| 型號(hào)： | LT1580-2.5 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 無電容，NMOS管，150mA的低壓差穩(wěn)壓器的反向電流保護(hù) |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 308K |
| 代理商： | LT1580-2.5 |
8
LT1580/LT1580-2.5
APPLICATIO
S I
N
FOR
ATIO
U
pin and the top of the resistor divider are connected to the
top of the load. The bottom of the resistor divider is
connected to the bottom of the load. R
P
is now effectively
connected inside the regulating loop of the LT1580 and the
load regulation at the load will be negligible for reasonable
W
U
values of R
P
. Trace B of Figure 3 illustrates the effect on
output regulation. It is important to note that the voltage
drops due to R
P
are not eliminated. They will add to the
dropout voltage of the regulator regardless of whether
they are inside the loop as in Figure 2 or outside the loop
as in Figure 1. This means that the LT1580 can control the
voltage at the load as long as the input-output voltage is
greater than the total of the dropout voltage of the LT1580
plus the voltage drop across R
P
.
Stability
The LT1580 requires the use of an output capacitor as part
of the device frequency compensation. The device re-
quires a minimum of 22
μ
F tantalum or 150
μ
F of aluminum
electrolytic to ensure stability. Larger capacitor values
increase stability and improve transient performance.
Many different types of capacitors are available and have
widely varying characteristics. These capacitors differ in
capacitor tolerance (sometimes up to
±
100%), equivalent
series resistance, equivalent series inductance and ca-
pacitance temperature coefficient. The LT1580 frequency
compensation optimizes frequency response with low
ESR capacitors. In general, use capacitors with an ESR of
less than 1
.
For microprocessor applications larger value capacitors
will be needed to meet the transient requirements of the
processor. Processor manufacturers require tight voltage
tolerances on the power supply. High quality bypass
capacitors must be used to limit the high frequency noise
generated by the processor. Multiple small ceramic ca-
pacitors in addition to high quality bulk tantalum capaci-
tors are typically required to limit parasitic inductance
(ESL) and resistance (ESR) in the capacitors to acceptable
levels. The LT1580 is stable with the type of capacitors
recommended by processor manufacturers.
Bypassing the adjust terminal on the LT1580 improves
ripple rejection and transient response. The ADJ pin is
brought out on the fixed voltage device specifically to
allow this capability.
Capacitor values on the order of several hundred microfar-
ads are used to ensure good transient response with heavy
V
OUT
SENSE
ADJ
R2
R1
1580 F02
R
P
R
P
LT1580
V
POWER
3.3V
5V
V
CONTROL
LOAD
V
OUT
+
–
V
OUT
SENSE
ADJ
R2
R1
1580 F01
R
P
R
P
LT1580
V
POWER
3.3V
5V
V
CONTROL
LOAD
V
OUT
+
–
Figure 1. Conventional Load Sensing
Figure 3. Remote Sensing Improves Load Regulation
V
FIGURE 1
(
I
OUT
)(R
P
)
TIME
1580 F03
V
FIGURE 2
I
OUT
Figure 2. Remote Load Sensing
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| LT1580CQ#PBF | 功能描述:IC LDO REGULATOR 7A ADJ DDPAK-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:控制器，DSP 輸入電壓:4.5 V ~ 25 V 輸出數(shù):2 輸出電壓:最低可調(diào)至 1.2V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:30-TFSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:30-TSSOP 包裝:帶卷 (TR) |
| LT1580CQ#TR | 功能描述:IC REGULATOR LDO ADJ 7A DDPAK-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
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