Datenblatt-pdf.com


ADP1712 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADP1712
Beschreibung CMOS Linear Regulator
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADP1712 Datasheet, Funktion
FEATURES
Maximum output current: 300 mA
Input voltage range: 2.5 V to 5.5 V
Light load efficient
IGND = 75 μA with 100 μA load
Low shutdown current: <1 μA
Very low dropout voltage: 170 mV @ 300 mA load
www.DataSheeItn4iUti.acol amccuracy: ±1%
Accuracy over line, load, and temperature: ±2%
16 fixed output voltage options with soft start:
0.75 V to 3.3 V (ADP1712)
Adjustable output voltage option: 0.8 V to 5.0 V
(ADP1712 Adjustable)
16 fixed output voltage options with reference bypass:
0.75 V to 3.3 V (ADP1713)
16 fixed output voltage options with tracking:
0.75 V to 3.3 V (ADP1714)
Low output noise: 40 μV rms
High PSRR: 72 dB @ 1 kHz
Stable with small 2.2 μF ceramic output capacitor
Excellent load/line transient response
Current limit and thermal overload protection
Logic controlled enable
5-lead TSOT package
APPLICATIONS
Mobile phones
Digital camera and audio devices
Portable and battery-powered equipment
Post dc-dc regulation
GENERAL DESCRIPTION
The ADP1712/ADP1713/ADP1714, available in a tiny, 5-lead
TSOT package, are low dropout linear regulators that operate
from 2.5 V to 5.5 V and provide up to 300 mA of output current.
The low 170 mV dropout voltage at a 300 mA load improves
efficiency and allows operation over a wide input voltage range.
Using a novel scaling architecture, ground current is a very low
75 μA when driving a 100 μA load, making the ADP1712/
ADP1713/ADP1714 ideal for battery-operated portable equipment.
The ADP1712/ADP1713/ADP1714 are available in 16 fixed
output voltage options. The ADP1712 is also available in an
adjustable version, which allows output voltages that range from
0.8 V to 5 V via an external divider. The ADP1712 fixed version
allows an external capacitor to be connected to program the
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.
300 mA, Low Dropout
CMOS Linear Regulator
ADP1712/ADP1713/ADP1714
TYPICAL APPLICATION CIRCUITS
VIN = 5V
2.2µF
ADP1712
1 IN
VOUT = 3.3V
OUT 5
2 GND
2.2µF
3 EN
10nF
SS 4
Figure 1. ADP1712 with Fixed Output Voltage and Soft-Start Capacitor, 3.3 V
VIN = 5.5V
2.2µF
ADP1712
ADJUSTABLE
1 IN
OUT
VOUT = 0.8V(1 + R1/R2)
5
2 GND
3 EN
ADJ 4
2.2µF
R1
R2
Figure 2. ADP1712 with Adjustable Output Voltage, 0.8 V to 5.0 V
VIN = 3V
2.2µF
ADP1713
1 IN
VOUT = 0.75V
OUT 5
2 GND
3 EN
10nF
BYP 4
2.2µF
Figure 3. ADP1713 with Fixed Output Voltage and Bypass Capacitor, 0.75 V
VIN = 3V
2.2µF
ADP1714
1 IN
OUT 5
2 GND
VOUT VOUT (V)
2.2µF
3
2
3 EN
TRK 4
0V TO 5V
1
0 12345
VTRK (V)
Figure 4. ADP1714 with Output Voltage Tracking
soft-start time. The ADP1713 allows a reference bypass capacitor
to be connected, which reduces output voltage noise and
improves power supply rejection. The ADP1714 includes a
tracking feature, which allows the output to follow an external
voltage rail or reference.
The ADP1712/ADP1713/ADP1714 are optimized for stable
operation with small 2.2 μF ceramic output capacitors, allowing
good transient performance while occupying minimal board
space. An enable pin controls the output voltage on all devices,
and an undervoltage lockout circuit disables the regulator if IN
drops below a minimum threshold. The parts also have short
circuit protection and thermal overload protection, which
prevent damage to the devices in adverse conditions.
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
©2007 Analog Devices, Inc. All rights reserved.






ADP1712 Datasheet, Funktion
ADP1712/ADP1713/ADP1714
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
IN 1 ADP1712 5 OUT
FIXED
GND 2
TOP VIEW
EN 3 (Not to Scale) 4 SS
Figure 5. 5-Lead TSOT (UJ-Suffix)
IN 1 ADP1712 5 OUT
ADJUSTABLE
GND 2
TOP VIEW
EN 3 (Not to Scale) 4 ADJ
Figure 6. 5-Lead TSOT (UJ-Suffix)
IN 1 ADP1713 5 OUT
GND 2 TOP VIEW
(Not to Scale)
EN 3
4 BYP
Figure 7. 5-Lead TSOT (UJ-Suffix)
IN 1 ADP1714 5 OUT
GND 2 TOP VIEW
(Not to Scale)
EN 3
4 TRK
Figure 8. 5-Lead TSOT (UJ-Suffix)
Table 4. Pin Function Descriptions
ADP1712 ADP1712
Fixed
Adjustable ADP1713
Pin No. Pin No.
Pin No.
www.Data1Sheet4U.com1
1
22
2
33
3
4
4
4
55
5
ADP1714
Pin No.
1
2
3
4
5
Mnemonic
IN
GND
EN
SS
ADJ
BYP
TRK
OUT
Description
Regulator Input Supply. Bypass IN to GND with a 2.2 μF or greater capacitor.
Ground.
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.
Soft Start. Connect a capacitor between SS and GND to set the output
start-up time.
Adjust. A resistor divider from OUT to ADJ sets the output voltage.
Bypass. Connect a 1 nF or greater capacitor (10 nF recommended)
between BYP and GND to reduce the internal reference noise for low
noise applications.
Track. The output follows the voltage placed on the TRK pin. (See the
Theory of Operation section for a more detailed description.)
Regulated Output Voltage. Bypass OUT to GND with a 2.2 μF or greater
capacitor.
Rev. 0 | Page 6 of 16

6 Page









ADP1712 pdf, datenblatt
ADP1712/ADP1713/ADP1714
APPLICATION INFORMATION
CAPACITOR SELECTION
Output Capacitor
The ADP1712/ADP1713/ADP1714 are designed for operation
with small, space-saving ceramic capacitors, but they 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 ADP1712/ADP1713/ADP1714. Transient
response to changes in load current is also affected by output
www.DatacSahpeaecti4taUn.cceo.mUsing a larger value of output capacitance improves
the transient response of the ADP1712/ADP1713/ADP1714 to
large changes in load current. Figure 31 and Figure 32 show the
transient responses for output capacitance values of 2.2 μF and
10 μF, respectively.
VOUT RESPONSE TO LOAD STEP
FROM 10mA TO 300mA
VIN = 5V
VOUT = 3.3V
CIN = 2.2µF
COUT = 2.2µF
TIME (20μs/DIV)
Figure 31. Output Transient Response, COUT = 2.2 μF
VOUT RESPONSE TO LOAD STEP
FROM 10mA TO 300mA
VIN = 5V
VOUT = 3.3V
CIN = 10µF
COUT = 10µF
TIME (20μs/DIV)
Figure 32. Output Transient Response, COUT = 10 μF
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 are
encountered. If greater than 2.2 μF of output capacitance is
required, increasing the input capacitor to match is recommended.
Input and Output Capacitor Properties
Any good quality ceramic capacitors can be used with the
ADP1712/ADP1713/ADP1714, 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 temper-
ature 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 ADP1712/ADP1713/ADP1714 are protected against damage
due to excessive power dissipation by current and thermal over-
load protection circuits. The ADP1712/ADP1713/ADP1714 are
designed to current limit when the output load reaches 500 mA
(typical). When the output load exceeds 500 mA, the output
voltage is reduced to maintain a constant current limit.
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 (typical), the output is turned on again and output
current is restored to its nominal value.
Consider the case where a hard short from OUT to ground occurs.
At first the ADP1712/ADP1713/ADP1714 current limit, so that
only 500 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 activates, turning off the output and
reducing the output current to zero. As the junction temper-
ature cools and drops below 135°C, the output turns on and
conducts 500 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
500 mA and 0 mA, which 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 needs to be externally
limited so junction temperatures do not exceed 125°C.
Rev. 0 | Page 12 of 16

12 Page





SeitenGesamt 16 Seiten
PDF Download[ ADP1712 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
ADP171(ADP170 / ADP171) CMOS Linear RegulatorsAnalog Devices
Analog Devices
ADP1710(ADP1710 / ADP1711) CMOS Linear RegulatorAnalog Devices
Analog Devices
ADP1711(ADP1710 / ADP1711) CMOS Linear RegulatorAnalog Devices
Analog Devices
ADP1712CMOS Linear RegulatorAnalog Devices
Analog Devices
ADP1713CMOS Linear RegulatorAnalog Devices
Analog Devices

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche