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参数资料
| 型号： | ADM666 |
| 厂商： | Analog Devices, Inc. |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | +5 V Fixed, Adjustable Micropower Linear Voltage Regulators(固定+5V输出或可调输出,低功耗线性稳压器) |
| 中文描述： | 5 V固定，可调微功耗线性稳压器（固定5V的输出或可调输出，低功耗线性稳压器） |
| 文件页数： | 5/6页 |
| 文件大小： | 103K |
| 代理商： | ADM666 |
ADM663/ADM666
REV. 0
–5–
Since the LBI input leakage current is less than 10 nA, large val-
ues may be selected for R3 and R4 in order to minimize loading.
For example, a 6 V low threshold, may be set using 10 M
for
R3 and 2.7 M
for R4.
Figure 5. ADM666 Adjustable Output with Low Battery
Detection
High Current Operation
T he ADM663 contains an additional output, V
OUT 1
, suitable
for directly driving the base of an external NPN transistor. Fig-
ure 6 shows a configuration which can be used to provide +5 V
with boosted current drive. A 1
current sensing resistor limits
the current at 0.5 A.
ADM663
V
OUT1
V
OUT2
GND
V
IN
SHDN
2N4237
V
IN
100
1.0
SENSE
V
SET
+
10
μ
F
+
10
μ
F
SHUTDOWN
+5V, 0.5A
OUTPUT
Figure 6. ADM663 Boosted Output Current (0.5 A)
T emperature Proportional Output
T he ADM663 contains a V
T C
output with a positive tempera-
ture coefficient of +2.5 mV/
°
C. T his may be connected to the
summing junction of the error amplifier (V
SET
) through a resis-
tor resulting in a negative temperature coefficient at the output
of the regulator.
T his is especially useful in multiplexed LCD displays to com-
pensate for the inherent negative temperature coefficient of the
LCD threshold. At 25
°
C the voltage at the VT C output is typi-
cally 0.9 V. T he equations for setting both the output voltage
and the tempco are given below. If this function is not being
used, then V
T C
should be left unconnected.
ADM666
SENSE
V
OUT
GND
V
IN
V
SET
LBI
+1.3V TO +15V
OUTPUT
+2V TO +16V
INPUT
R
CL
R2
R1
LBO
SHDN
R3
R4
LOW
BATTERY
OUTPUT
R3
R1
R2
ADM663
V
TC
V
SET
SENSE
V
OUT2
V
OUT
Figure 7. ADM663 Temperature Proportional Output
V
OUT
=
V
SET
×
1
+
R
2
R
1
R
2
R
3
×
V
SET
±
V
TC
(
)
TCV
OUT
=
±
R
2
R
3
×
TVC
TC
whereV
SET
= +
1.3
V
,
V
TC
= +
0.9
V
,
TCV
TC
= +
2.5
mV
/
°
C
APPLICAT ION HINT S
Input-Output (Dropout Voltage)
A regulator’s minimum input-output differential or dropout
voltage determines the lowest input voltage for a particular out-
put voltage. T he ADM663/ADM666 dropout voltage is 0.8 V at
its rated output current. For example when used as a fixed +5 V
regulator the minimum input voltage is +5.8 V. At lower output
currents, (I
OUT
< 5 mA), on the ADM663, V
OUT 1
may be used
as the output driver in order to achieve lower dropout voltages.
Please refer to Figure 9. In this case the dropout voltage de-
pends on the voltage drop across the internal FET transistor.
T his may be calculated by multiplying the FET ’s saturation re-
sistance by the output current. As the current limit circuitry is
referenced to V
OUT 2
, V
OUT 2
should be connected to V
OUT 1
. For
high current operation V
OUT 2
should be used alone and V
OUT 1
left unconnected.
Bypass Capacitors
T he high frequency performance of the ADM663/ADM666
may be improved by decoupling the output using a filter capaci-
tor. A capacitor value of 10
μ
F is suitable.
An input capacitor helps reduce noise and improves dynamic
performance. A suitable input capacitor of 0.1
μ
F or greater
may be used.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM666A | 制造商:AD 制造商全称:Analog Devices 功能描述:Tri-Mode: +3.3 V, +5 V, Adjustable Micropower Linear Voltage Regulators |
| ADM666AAN | 制造商:AD 制造商全称:Analog Devices 功能描述:Tri-Mode: +3.3 V, +5 V, Adjustable Micropower Linear Voltage Regulators |
| ADM666AAR | 制造商:AD 制造商全称:Analog Devices 功能描述:Tri-Mode: +3.3 V, +5 V, Adjustable Micropower Linear Voltage Regulators |
| ADM666AN | 制造商:Analog Devices 功能描述:Standard Regulator Pos 1.3V to 16V5V 0.04A 8-Pin PDIP 制造商:Analog Devices 功能描述:IC V REG ADJ +2/16.5V DIP8 666 |
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