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參數(shù)資料
| 型號： | LTC1258-5 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Micropower Low Dropout References(5V輸出,微功耗，低壓差電壓基準) |
| 中文描述： | 微功率低壓差參考（5V的輸出，微功耗，低壓差電壓基準） |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 156K |
| 代理商： | LTC1258-5 |
6
LTC1258 Series
Figure 1. Reference Output Load Transient Response, 1
μ
F Output Capacitor
1mA
I
OUT
0mA
1mA
I
OUT
0mA
V
100mV/DIV
V
100mV/DIV
0.5ms/DIV
1258 F01b
10ms/DIV
1258 F01a
APPLICATIO
S I
N
FOR
ATIO
U
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 LTC1258 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
LTC1258 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 LTC1258-2.5, yet the same connection can deliver
10mA of load current when demanded.
W
U
Figure 2. Adding a Damping Resistor with
Output Capacitors Greater Than 1
μ
F
Output Bypass Capacitor
The LTC1258 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 capaci-
tance 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 3. Damping Resistance vs Output Capacitor Value
LTC1258-5
OUT
IN
GND
4
2
5.2V
TO
12.6V
1
5V
1258 F02
0.1
μ
F
C
OUT
>1
F
DAMPING RESISTOR
<1k
OUTPUT CAPACITOR VALUE (
μ
F)
1
10
R
)
100
1k
10k
10
100
1000
1258 F03
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