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ADP1716 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADP1716
Beschreibung (ADP1715 / ADP1716) CMOS Linear Regulator
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 20 Seiten
ADP1716 Datasheet, Funktion
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.






ADP1716 Datasheet, Funktion
ADP1715/ADP1716
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.8 V, IOUT = 10 mA, CIN = 2.2 μF, COUT = 2.2 μF, TA = 25°C, unless otherwise noted.
3.364
3.354
3.344
3.334
3.324
3.314
3.304
ILOAD = 10mA ILOAD = 100mA
ILOAD = 100µA
3.294
3.284
3.274
3.264
3.254
3.244
ILOAD = 500mA
ILOAD = 360mA
ILOAD = 250mA
3.234
–40 –5 25 85 125
TJ (°C)
Figure 7. Output Voltage vs. Junction Temperature
500
450
400 ILOAD = 500mA
350
ILOAD = 360mA
300
ILOAD = 250mA
250
200
ILOAD = 100mA
150
100 ILOAD = 10mA
50 ILOAD = 100µA
0
–40 –5 25 85 125
TJ (°C)
Figure 10. Ground Current vs. Junction Temperature
3.325
3.315
3.305
3.295
3.285
3.275
3.265
0.1
1 10 100
ILOAD (mA)
Figure 8. Output Voltage vs. Load Current
1000
500
450
400
350
300
250
200
150
100
50
0
0.1 1 10 100
ILOAD (mA)
Figure 11. Ground Current vs. Load Current
1000
3.325
600
3.315
3.305
3.295
3.285
3.275
ILOAD = 100µA
ILOAD = 10mA
ILOAD = 100mA
ILOAD = 250mA
ILOAD = 500mA
ILOAD = 360mA
3.265
3.3
3.8 4.3 4.8
VIN (V)
Figure 9. Output Voltage vs. Input Voltage
5.3
500
400 ILOAD = 500mA
300 ILOAD = 360mA
ILOAD = 250mA
200 ILOAD = 100mA
100 ILOAD = 10mA
ILOAD = 100µA
0
3.3 3.8 4.3 4.8 5.3
VIN (V)
Figure 12. Ground Current vs. Input Voltage
Rev. 0 | Page 6 of 20

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ADP1716 pdf, datenblatt
ADP1715/ADP1716
APPLICATION INFORMATION
CAPACITOR SELECTION
Output Capacitor
The ADP1715/ADP1716 are designed for operation with small,
space-saving ceramic capacitors, but they will function with most
commonly used capacitors as long as care is taken about the
effective series resistance (ESR) value. The ESR of the output
capacitor affects stability of the LDO control loop. A minimum of
2.2 μF capacitance with an ESR of 500 mΩ or less is recommended
to ensure stability of the ADP1715/ADP1716. Transient response
to changes in load current is also affected by output capacitance.
Using a larger value of output capacitance improves the transient
response of the ADP1715/ADP1716 to large changes in load
current. Figure 32 and Figure 33 show the transient responses for
output capacitance values of 2.2 μF and 22 μF.
SWITCH SIGNAL TO CHANGE
OUTPUT LOAD FROM 25mA TO 475mA
1
Input and Output Capacitor Properties
Any good quality ceramic capacitors can be used with the
ADP1715/ADP1716, as long as they meet the minimum
capacitance and maximum ESR requirements. Ceramic
capacitors are manufactured with a variety of dielectrics, each
with different behavior over temperature and applied voltage.
Capacitors must have a dielectric adequate to ensure the
minimum capacitance over the necessary temperature range
and dc bias conditions. X5R or X7R dielectrics with a voltage
rating of 6.3 V or 10 V are recommended. Y5V and Z5U
dielectrics are not recommended, due to their poor temperature
and dc bias characteristics.
CURRENT LIMIT AND THERMAL OVERLOAD
PROTECTION
The ADP1715/ADP1716 are protected against damage due to
excessive power dissipation by current and thermal overload
protection circuits. The ADP1715/ADP1716 are designed to
current limit when the output load reaches 750 mA (typical).
When the output load exceeds 750 mA, the output voltage is
reduced to maintain a constant current limit.
2
VOUT
VIN = 5V
VOUT = 3.3V
CIN = 2.2µF
COUT = 2.2µF
TIME (2µs/DIV)
Figure 32. Output Transient Response
Thermal overload protection is included, which limits the
junction temperature to a maximum of 150°C (typical). Under
extreme conditions (that is, high ambient temperature and
power dissipation) when the junction temperature starts to rise
above 150°C, the output is turned off, reducing the output
current to zero. When the junction temperature drops below
135°C, the output is turned on again and output current is
restored to its nominal value.
SWITCH SIGNAL TO CHANGE
OUTPUT LOAD FROM 25mA TO 475mA
1
2
VOUT
VIN = 5V
VOUT = 3.3V
CIN = 22µF
COUT = 22µF
TIME (2µs/DIV)
Figure 33. Output Transient Response
Input Bypass Capacitor
Connecting a 2.2 μF capacitor from the IN pin to GND reduces
the circuit sensitivity to printed circuit board (PCB) layout,
especially when long input traces, or high source impedance, is
encountered. If greater than 2.2 μF of output capacitance is
required, the input capacitor should be increased to match it.
Consider the case where a hard short from OUT to ground
occurs. At first the ADP1715/ADP1716 will current limit, so
that only 750 mA is conducted into the short. If self heating of
the junction is great enough to cause its temperature to rise
above 150°C, thermal shutdown will activate, turning off the
output and reducing the output current to zero. As the
junction temperature cools and drops below 135°C, the output
turns on and conducts 750 mA into the short, again causing
the junction temperature to rise above 150°C. This thermal
oscillation between 135°C and 150°C causes a current
oscillation between 750 mA and 0 mA that continues as long
as the short remains at the output.
Current and thermal limit protections are intended to protect
the device against accidental overload conditions. For reliable
operation, device power dissipation should be externally limited
so junction temperatures do not exceed 125°C.
THERMAL CONSIDERATIONS
To guarantee reliable operation, the junction temperature of the
ADP1715/ADP1716 should not exceed 125°C. To ensure the
junction temperature stays below this maximum value, the user
Rev. 0 | Page 12 of 20

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