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參數(shù)資料
| 型號： | ADP667AN |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | +5 V Fixed, Adjustable Low-Dropout Linear Voltage Regulator |
| 中文描述： | FIXED/ADJUSTABLE POSITIVE LDO REGULATOR, 0.35 V DROPOUT, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大小： | 135K |
| 代理商： | ADP667AN |
ADP667
REV. 0
–4–
APPLICATIONS INFORMATION
Circuit Configurations
For a fixed +5 V output the SET input should be grounded, and
no external resistors are necessary. This basic configuration is
shown in Figure 2. The input voltage can range from +5.15 V
to +16.5 V, and output currents up to 250 mA are available
provided that the maximum package power dissipation is not
exceeded.
IN
OUT
GND
SET
SHDN
ADP667
+5V
OUTPUT
C1
10μF
+
+
Figure 2. Fixed +5 V Output Circuit
Output Voltage Setting
If the SET input is connected to a resistor divider network, the
output voltage is set according to the following equation:
V
OUT
=
V
SET
×
R
1
+
R
2
R
1
where
V
SET
= 1.255 V.
IN
OUT
GND
SET
SHDN
ADP667
+
R1
R2
V
IN
V
OUT
C1
10μF
Figure 3. Adjustable Output Circuit
The resistor values may be selected by first choosing a value for
R1 and then selecting R2 according to the following equation:
R
2
=
R
1
×
V
OUT
V
SET
1
The input leakage current on SET is 10 nA maximum. This
allows 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 accord-
ingly. The tolerance on SET is guaranteed at less than
±
25 mV,
so in most applications fixed resistors will be suitable.
Shutdown Input (SHDN)
The SHDN input allows the regulator to be switched off with a
logic level signal. This will disable the output and reduce the
current drain to a low quiescent (1
μ
A maximum) current. This
is very useful for low power applications. Driving the SHDN in-
put to greater than 1.5 V places the part in shutdown.
If the shutdown function is not being used, then SHDN should
be connected to GND.
Low Supply or Low Battery Detection
The ADP667 contains on-chip circuitry for low power supply or
battery detection. If the voltage on the LBI pin falls below the
internal 1.255 V reference, then the open drain output LBO will
go low. The low threshold voltage may be set to any voltage
above 1.255 V by appropriate resistor divider selection.
R
3
=
R
4
×
V
BATT
V
LBI
–1
where R3 and R4 are the resistive divider resistors and V
BATT
is
the desired low voltage threshold.
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.
The LBO output is an open-drain output that goes low sinking
current when LBI is less than 1.255 V. A pull-up resistor of
10 k
or greater may be used to obtain a logic output level with
the pull-up resistor connected to V
OUT
.
IN
OUT
LBO
ADP667
C1
10μF
+
10k
V
IN
LBI
GND
SET
SHDN
R3
R4
LOW BATTERY
STATUS OUTPUT
V
OUT
Figure 4. Low Battery/Supply Detect Circuit
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| ADP667AR-REEL | 制造商:Analog Devices 功能描述:LDO Regulator Pos 1.3V to 16V5V 0.25A 8-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:LOW DROPOUT LINEAR VOLTAGE REGULATOR - Tape and Reel |
| ADP667AR-REEL7 | 制造商:Analog Devices 功能描述:LDO Regulator Pos 1.3V to 16V5V 0.25A 8-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:LOW DROPOUT LINEAR VOLTAGE REGULATOR - Tape and Reel |
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