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PDF ADP1715 Data sheet ( Hoja de datos )
| Número de pieza | ADP1715 | |
| Descripción | (ADP1715 / ADP1716) CMOS Linear Regulator | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADP1715 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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FEATURES
Maximum output current: 500 mA
Input voltage range: 2.5 V to 5.5 V
Low shutdown current: <1 μA
Low dropout voltage:
250 mV @ 500 mA load
50 mV @ 100 mA load
Initial accuracy: ±1%
Accuracy over line, load, and temperature: ±3%
16 fixed output voltage options with soft start:
0.75 V to 3.3 V (ADP1715)
Adjustable output voltage option: 0.8 V to 5.0 V
(ADP1715 Adjustable)
16 fixed output voltage options with tracking:
0.75 V to 3.3 V (ADP1716)
Stable with small 2.2 μF ceramic output capacitor
Excellent load/line transient response
Current limit and thermal overload protection
Logic controlled enable
8-lead thermally enhanced MSOP package
APPLICATIONS
Notebook computers
Memory components
Telecommunications equipment
Network equipment
DSP/FPGA/μP supplies
Instrumentation equipment/data acquisition systems
GENERAL DESCRIPTION
The ADP1715/ADP1716 are low dropout, CMOS linear
regulators that operate from 2.5 V to 5.5 V and provide up to
500 mA of output current. Using an advanced proprietary
architecture, they provide high power supply rejection and
achieve excellent line and load transient response with just a
small 2.2 μF ceramic output capacitor.
Three versions of this part are available, one with fixed
output voltage options and variable soft start (ADP1715),
one with adjustable output voltage and fixed soft start
(ADP1715 Adjustable), and one with voltage tracking in
fixed output voltage options (ADP1716). The fixed output
voltage options are internally set to one of sixteen values
500 mA, Low Dropout,
CMOS Linear Regulator
ADP1715/ADP1716
TYPICAL APPLICATION CIRCUITS
VIN = 5V
2.2µF
VOUT = 3.3V
2.2µF
ADP1715
1 EN
2 IN
3 OUT
4 SS
GND 8
GND 7
GND 6
GND 5
10nF
Figure 1. ADP1715 with Fixed Output Voltage, 3.3 V
VIN = 5V
2.2µF
VOUT = 0.8(1 + R1/R2)
2.2µF
ADP1715
ADJUSTABLE
1 EN GND 8
2 IN
GND 7
3 OUT GND 6
R1 4 ADJ GND 5
R2
Figure 2. ADP1715 with Adjustable Output Voltage, 0.8 V to 5.0 V
VIN = 5V
2.2µF
VOUT
2.2µF
ADP1716
1 EN
2 IN
3 OUT
4 TRK
GND 8
GND 7
GND 6
GND 5
VTRK = 0V TO 5V
VOUT (V)
3
2
1
0 12345
VTRK (V)
Figure 3. ADP1716 with Output Voltage Tracking
between 0.75 V and 3.3 V; the adjustable output voltage can
be set to any value between 0.8 V and 5.0 V by an external
voltage divider connected from OUT to ADJ. The variable
soft start uses an external capacitor at SS to control the
output voltage ramp. Tracking limits the output voltage to
the at-or-below voltage at the TRK pin.
The ADP1715/ADP1716 are available in 8-lead thermally
enhanced MSOP packages, making them not only a very
compact solution but also providing excellent thermal
performance for applications requiring up to 500 mA of output
current in a small, low profile footprint.
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
1 page  
ADP1715/ADP1716
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
EN 1
IN 2
OUT 3
SS 4
ADP1715
FIXED
TOP VIEW
(Not to Scale)
8 GND
7 GND
6 GND
5 GND
Figure 4. 8-Lead MSOP (RM-Suffix)
EN 1
IN 2
OUT 3
ADJ 4
ADP1715
ADJUSTABLE
TOP VIEW
(Not to Scale)
8 GND
7 GND
6 GND
5 GND
Figure 5. 8-Lead MSOP (RM-Suffix)
EN 1
IN 2
OUT 3
TRK 4
ADP1716
TOP VIEW
(Not to Scale)
8 GND
7 GND
6 GND
5 GND
Figure 6. 8-Lead MSOP (RM-Suffix)
Table 4. Pin Function Descriptions
ADP1715
Fixed
Pin No.
ADP1715
Adjustable
Pin No.
ADP1716
Pin No.
11
1
22
33
2
3
4
4
4
5, 6, 7, 8
5, 6, 7, 8
5, 6, 7, 8
Mnemonic
EN
IN
OUT
SS
ADJ
TRK
GND
Description
Enable Input. Drive EN high to turn on the regulator; drive it low to turn off the
regulator. For automatic startup, connect EN to IN.
Regulator Input Supply. Bypass IN to GND with a 2.2 μF or greater capacitor.
Regulated Output Voltage. Bypass OUT to GND with a 2.2 μF or greater
capacitor.
Soft Start. A capacitor connected to this pin determines the soft-start time.
Adjust. A resistor divider from OUT to ADJ sets the output voltage.
Track. The output will follow the voltage placed on the TRK pin. (See the
Theory of Operation section for a more detailed description.)
Ground.
Rev. 0 | Page 5 of 20
5 Page 
ADJUSTABLE OUTPUT VOLTAGE
(ADP1715 ADJUSTABLE)
The ADP1715 adjustable version can have its output voltage
set over a 0.8 V to 5.0 V range. The output voltage is set by
connecting a resistive voltage divider from OUT to ADJ. The
output voltage is calculated using the equation
VOUT = 0.8 V (1 + R1/R2)
(2)
where:
R1 is the resistor from OUT to ADJ.
R2 is the resistor from ADJ to GND.
The maximum bias current into ADJ is 100 nA, so for less
than 0.5% error due to the bias current, use values less than
60 kΩ for R2.
TRACK MODE (ADP1716)
The ADP1716 includes a tracking mode feature. As shown in
Figure 29, if the voltage applied at the TRK pin is less than the
nominal output voltage, OUT is equal to the voltage at TRK.
Otherwise, OUT regulates to its nominal output value.
4
3
2
1
0
012345
VTRK (V)
Figure 29. ADP1716 Output Voltage vs. Tracking Voltage
with Nominal Output Voltage Set to 3 V
For example, consider an ADP1716 with a nominal output
voltage of 3 V. If the voltage applied to its TRK pin is greater
than 3 V, OUT maintains a nominal output voltage of 3 V. If
the voltage applied to TRK is reduced below 3 V, OUT tracks
this voltage. OUT can track the TRK pin voltage from the
nominal value all the way down to 0 V. A voltage divider is
present from TRK to the error amplifier input with a divider
ratio equal to the divider from OUT to the error amplifier.
This sets the output voltage equal to the tracking voltage. Both
divider ratios are set by post-package trim, depending on the
desired output voltage.
ADP1715/ADP1716
ENABLE FEATURE
The ADP1715/ADP1716 use the EN pin to enable and disable
the OUT pin under normal operating conditions. As shown in
Figure 30, when a rising voltage on EN crosses the active
threshold, OUT turns on. When a falling voltage on EN crosses
the inactive threshold, OUT turns off.
EN
1
OUT
VIN = 5V
VOUT = 1.6V
COUT = 2.2µF
ILOAD = 10mA
TIME (1ms/DIV)
Figure 30. ADP1715 Adjustable Typical EN Pin Operation
As can be seen, the EN pin has hysteresis built in. This prevents
on/off oscillations that can occur due to noise on the EN pin as
it passes through the threshold points.
The EN pin active/inactive thresholds are derived from the IN
voltage. Therefore, these thresholds vary with changing input
voltage. Figure 31 shows typical EN active/inactive thresholds
when the input voltage varies from 2.5 V to 5.5 V.
1.4
1.3
1.2 EN ACTIVE
1.1
HYSTERESIS
1.0
0.9
0.8
0.7 EN INACTIVE
0.6
0.5
2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50
VIN (V)
Figure 31. Typical EN Pin Thresholds vs. Input Voltage
Rev. 0 | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ADP1715.PDF ] | |
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