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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： | 4/6页 |
| 文件大小： | 103K |
| 代理商： | ADM666 |
ADM663/ADM666
REV. 0
–4–
ADM663
ADM666
SENSE
V
OUT(2)
GND
V
IN
V
SET
SHDN
+5V
OUTPUT
+6V TO +16V
INPUT
ADM663
ADM666
SENSE
V
OUT(2)
GND
V
IN
V
SET
SHDN
+1.3V TO +15V
OUTPUT
+2V TO +16V
INPUT
R
CL
R2
R1
Figure 4. ADM663/ADM666 Adjustable Output
Current Limiting
Current limiting may be achieved by using an external current
sense resistor in series with V
OUT (2)
. When the voltage across
the sense resistor exceeds the internal 0.5 V threshold, current
limiting is activated. T he sense resistor is therefore chosen such
that the voltage across it will be 0.5 V when the desired current
limit is reached.
R
CL
=
0.5
I
CL
where R
CL
is the current sense resistor, I
CL
is the maximum
current limit.
T he value chosen for R
CL
should also ensure that the current is
limited to less than the 50 mA absolute maximum rating and
also that the power dissipation will also be within the package
maximum ratings.
If current limiting is employed, there will be an additional volt-
age drop across the sense resistor which must be considered
when determining the regulators dropout voltage.
If current limiting is not used, the SENSE input should be con-
nected to V
OUT (2)
.
Shutdown Input (SHDN)
T he SHDN input allows the regulator to be switched off with a
logic level signal. T his will disable the output and reduce the
current drain to a low quiescent (12
μ
A maximum) current.
T his is very useful for low power applications. T he SHDN input
should be driven with a CMOS logic level signal since the input
threshold is 0.3 V. In T T L systems, an open collector driver
with a pull-up resistor may be used.
If the shutdown function is not being used, then SHDN should
be connected to GND.
Low Supply or Low Battery Detection
T he ADM666 contains on-chip circuitry for low power supply
or battery detection. If the voltage on the LBI pin falls below the
internal 1.3 V reference, then the open drain output LBO will
go low. T he low threshold voltage may be set to any voltage
above 1.3 V by appropriate resistor divider selection.
R
3
=
R
4
×
V
BATT
1.30
±1
where R3 and R4 are the resistive divider resistors and V
BAT T
is
the desired low voltage threshold.
50mV
V
IN
ADM666
SHDN
GND
LBO
V
SET
LBI
V
OUT
SENSE
1.3V
REF
C2
0.5V
C1
C3
A1
Figure 2. ADM666 Functional Block Diagram
Circuit Configurations
For a fixed +5 V output the V
SET
input is grounded and no ex-
ternal resistors are necessary. T his basic configuration is shown
in Figure 3. Current limiting is not being utilized so the SENSE
input is connected to V
OUT (2)
. T he input voltage can range from
+6 V to +16 V and output currents up to 40 mA are available
provided that the maximum package power dissipation is not
exceeded.
Figure 3. ADM663/ADM666 Fixed +5 V Output
Output Voltage Setting
If V
SET
is not connected to GND, the output voltage is set ac-
cording to the following equation.
V
OUT
=
V
SET
×
R
1
+
R
2
R
1
whereV
SET
=
1.30
V
T he resistor values may be selected by firstly choosing a
value for R1 and then selecting R2 according to the following
equation.
R
2
=
R
1
×
V
1.30±1
T he input leakage current on V
SET
is 10 nA maximum. T his al-
lows large resistor values to be chosen for R1 and R2 with little
degradation in accuracy. For example, a 1 M
resistor may be
selected for R1 and then R2 may be calculated accordingly.
T he tolerance on V
SET
is guaranteed at less than
±
30 mV so in
most applications, fixed resistors will be suitable.
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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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