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參數(shù)資料
| 型號： | LTC1798CS8-2.5 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Micropower Low Dropout References(2.5V輸出,微功耗，低壓差穩(wěn)壓器) |
| 中文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.5 V, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 149K |
| 代理商： | LTC1798CS8-2.5 |
LTC1798 Series
6
Longer Battery Life
Series references have an advantage over shunt style
references. To operate, shunt references require a resistor
between the power supply and the output. This resistor
must be chosen to supply the maximum current that is
demanded by the circuit being regulated. When the circuit
being controlled is not operating at this maximum current,
the shunt reference must always sink this current, result-
ing in high power dissipation and short battery life.
The LTC1798 series low dropout references do not require
a current setting resistor and can operate with any supply
voltage from (V
OUT(NOMINAL)
+ 0.2V) to 12.6V. When the
circuitry being regulated does not demand current, the
LTC1798 series reduces its dissipation and battery life is
extended. If the reference is not delivering load current it
dissipates only 10.8
μ
W when operating on a 2.7V supply
for LTC1798-2.5, yet the same connection can deliver
10mA of load current when demanded.
Output Bypass Capacitor
The LTC1798 series is designed to be stable with or
without capacitive loads. With no capacitive load, the
reference is ideal for fast settling applications, or where PC
board space is at a premium.
In applications with significant output loading changes,
an output bypass capacitor of up to 1
μ
F can be used to
improve the output transient response. Figure 1 shows
the response of the reference to a 1mA to 0
μ
A load step
with a 1
μ
F output capacitor. If more than 1
μ
F of output
capacitance is required, a resistor in series with the
capacitor is recommended to reduce the output ringing.
Figure 2 illustrates the use of a damping resistor for
capacitive loads greater than 1
μ
F. Figure 3 shows the
resistor and capacitor values required to achieve critical
damping.
Figure 1. Reference Output Load Transient Response, 1
μ
F Output Capacitor
Figure 2. Adding a Damping Resistor with
Output Capacitors Greater Than 1
μ
F
Figure 3. Damping Resistance vs Output Capacitor Value
1mA
0mA
I
OUT
V
100mV/DIV
10ms/DIV
1798 F01a
1mA
0mA
I
OUT
V
100mV/DIV
0.5ms/DIV
1798 F01b
LTC1798-5
OUT
IN
GND
4
2
5.2V
TO
12.6V
6
5V
1798 F02
0.1
μ
F
C
OUT
>1
μ
F
DAMPING RESISTOR
<1k
OUTPUT CAPACITOR VALUE (
μ
F)
1
10
R
)
100
1k
10k
10
100
1000
1798 F03
APPLICATIU
W
U
U
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| LTC1798CS8-3#TR | 功能描述:IC VREF SERIES 3V 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電壓基準(zhǔn) 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- 基準(zhǔn)類型:旁路，可調(diào)節(jié)，精度 輸出電壓:1.24 V ~ 16 V 容差:±0.5% 溫度系數(shù):- 輸入電壓:1.24 V ~ 16 V 通道數(shù):1 電流 - 陰極:100µA 電流 - 靜態(tài):- 電流 - 輸出:20mA 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:TO-226-3、TO-92-3（TO-226AA）成形引線 供應(yīng)商設(shè)備封裝:TO-92-3 包裝:帶卷 (TR) |
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