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PDF ADP3367 Data sheet ( Hoja de datos )
| Número de pieza | ADP3367 | |
| Descripción | +5 V Fixed/ Adjustable Low-Dropout Linear Voltage Regulator | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
+5 V Fixed, Adjustable
Low-Dropout Linear Voltage Regulator
ADP3367*
FEATURES
Low Dropout: 150 mV @ 200 mA
Low Dropout: 300 mV @ 300 mA
Low Power CMOS: 17 A Quiescent Current
Shutdown Mode: 0.2 A Quiescent Current
300 mA Output Current Guaranteed
Pin Compatible with MAX667
Stable with 10 F Load Capacitor
+2.5 V to +16.5 V Operating Range
Low Battery Detector
Fixed +5 V or Adjustable Output
High Accuracy: ؎2%
Dropout Detector Output
Low Thermal Resistance Package*
ESD > 6000 V
APPLICATIONS
Handheld Instruments
Cellular Telephones
Battery Operated Devices
Portable Equipment
Solar Powered Instruments
High Efficiency Linear Power Supplies
GENERAL DESCRIPTION
The ADP3367 is a low-dropout precision voltage regulator that
can supply up to 300 mA output current. It can be used to give
a fixed +5 V output with no additional external components or
can be adjusted from +1.3 V to +16 V using two external
resistors. Fixed or adjustable operation can be selected via the
SET input. The low quiescent current (17 µA) in conjunction
with the standby or shutdown mode (0.2 µA) makes this device
especially suitable for battery powered systems. The dropout
voltage when supplying 100 µA is only 15 mV allowing opera-
tion with minimal headroom thereby prolonging the useful bat-
tery life. At higher output current levels the dropout remains
low increasing to just 150 mV when supplying 200 mA. A wide
input voltage range from 2.5 V to 16.5 V is allowable. Addi-
tional features include a dropout detector and a low supply/bat-
tery monitoring comparator. The dropout detector can be used
to signal loss of regulation while the low battery detector can be
used to monitor the input supply voltage.
The ADP3367 is a much improved pin-compatible replacement
for the MAX667. Improvements include lower supply current,
tighter voltage accuracy and superior line and load regulation.
Improved ESD protection (>6000 V) is achieved by advanced
voltage clamping structures. The ADP3367 is specified over the
industrial temperature range –40°C to +85°C and is available in
narrow surface mount (SOIC) packages.
*Patent pending.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FUNCTIONAL BLOCK DIAGRAM
IN
SHDN
LBO
LBI
GND
ADP3367
OUT
DD
A1
C2
1.255V
REF
SET
C1
50mV
TYPICAL OPERATING CIRCUIT
+6V
INPUT +
IN OUT
ADP3367
SET GND SHDN
+ C1
10µF
+5V
OUTPUT
400
TA = +50°C
300 GUARANTEED 300mA
200
ADP3367
DISSIPATION LIMIT
100
0
0
STANDARD
SO PACKAGE
DISSIPATION LIMIT
5 10
VIN–VOUT – V
15
Load Current vs. Input-Output Differential Voltage
ADI’s proprietary Thermal Coastline leadframe used in ADP3367AR
packaging, has 30% lower thermal resistance than the standard
leadframes. This improvement in heat flow rate results in lower
die temperature hence improves reliability.
© Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
1 page  
ADP3367
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 8. The input voltage can range from +5.15 V
to +16.5 V, and output currents up to 300 mA are available
provided that the maximum package power dissipation is not
exceeded.
IN
+
OUT
+ C1
+5V
OUTPUT
ADP3367
10µF
SET GND SHDN
Figure 8. 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:
VOUT
= V SET
× R1 + R2
R1
where VSET = 1.255 V.
VIN IN
OUT
VOUT
ADP3367
R2
+ C1
10µF
SET
SHDN GND
R1
Figure 9. 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:
R2 = R1 × VVOSEUTT
−
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 MΩ 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 (0.75 µA maximum) current.
This is very useful for low power applications. Driving the
SHDN input 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 ADP3367 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.
R3
=
R4
×
VBATT
VLBI
−
1
where R3 and R4 are the resistive divider resistors and VBATT is
the desired low voltage threshold.
Since the LBI input leakage current is less than 10 nA, large
values may be selected for R3 and R4 in order to minimize
loading. For example, a 6 V low threshold, may be set using
10 MΩ for R3 and 2.7 MΩ 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 kΩ or greater may be used to obtain a logic output level with
the pull-up resistor connected to VOUT.
VIN
R3
R4
IN
OUT
ADP3367
LBI
LBO
SHDN GND SET
10kΩ
+ C1
10µF
VOUT
LOW BATTERY
STATUS OUTPUT
Figure 10. Low Battery/Supply Detect Circuit
Dropout Detector
The ADP3367 features an extremely low dropout voltage mak-
ing it suitable for low voltage systems where headroom is
limited. A dropout detector is also provided. The dropout
detector output, DD, changes as the dropout voltage approaches
its limit. This is useful for warning that regulation can no longer be
maintained. The dropout detector output is an open collector out-
put from a PNP transistor. Under normal operating conditions
with the input voltage more than 300 mV above the output, the
PNP transistor is off and no current flows out the DD pin. As the
voltage differential reduces to less than 300 mV, the transistor
switches on and current is sourced. This condition indicates that
regulation can no longer be maintained. Please refer to Figure 4 in
the “Typical Performance Characteristics.” The current output
can be translated into a voltage output by connecting a resistor
from DD to GND. A resistor value of 100 kΩ is suitable. A digital
status signal can be obtained using a comparator. The on-chip
comparator LBI may be used if it is not being used to monitor a
battery voltage. This is illustrated in Figure 11.
REV. 0
–5–
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| PDF Descargar | [ Datasheet ADP3367.PDF ] | |
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