300 mA, Low Dropout
CMOS Linear Regulator
ADP1712/ADP1713/ADP1714
TYPICAL APPLICATION CIRCUITS
FEATURES
Mobile phones
Digital camera and audio devices
Portable and battery-powered equipment
Post dc-dc regulation
VOUT = 3.3V
1
IN
2
GND
3
EN
OUT
5
2.2µF
2.2µF
06455-001
10nF
SS
4
Figure 1. ADP1712 with Fixed Output Voltage and Soft-Start Capacitor, 3.3 V
ADP1712
ADJUSTABLE
VIN = 5.5V
1
IN
2
GND
VOUT = 0.8V(1 + R1/R2)
OUT
5
2.2µF
2.2µF
R1
3
EN
ADJ
4
06455-002
R2
Figure 2. ADP1712 with Adjustable Output Voltage, 0.8 V to 5.0 V
ADP1713
VIN = 3V
1
IN
OUT
2
GND
VOUT = 0.75V
5
2.2µF
2.2µF
10nF
3
EN
BYP
4
Figure 3. ADP1713 with Fixed Output Voltage and Bypass Capacitor, 0.75 V
ADP1714
VIN = 3V
VOUT
1
IN
2
GND
3
EN
OUT
VOUT (V)
5
2.2µF
2.2µF
3
2
1
TRK
4
0V TO 5V
0
1 2 3 4 5
VTRK (V)
06455-004
APPLICATIONS
ADP1712
VIN = 5V
06455-003
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
Initial accuracy: ±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
Figure 4. ADP1714 with Output Voltage Tracking
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
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.
Rev. A
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.
Trademarks and registered trademarks are the property of their respective owners.
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 ©2007–2009 Analog Devices, Inc. All rights reserved.
ADP1712/ADP1713/ADP1714
TABLE OF CONTENTS
Features .............................................................................................. 1
Adjustable Output Voltage (ADP1712 Adjustable) ............... 11
Applications ....................................................................................... 1
Bypass Capacitor (ADP1713) ................................................... 11
Typical Application Circuits............................................................ 1
Track Mode (ADP1714) ............................................................ 11
General Description ......................................................................... 1
Enable Feature ............................................................................ 11
Revision History ............................................................................... 2
Undervoltage Lockout (UVLO) ............................................... 11
Specifications..................................................................................... 3
Application Information ................................................................ 12
Absolute Maximum Ratings............................................................ 5
Capacitor Selection .................................................................... 12
Thermal Resistance ...................................................................... 5
Current Limit and Thermal Overload Protection ................. 12
ESD Caution .................................................................................. 5
Thermal Considerations............................................................ 13
Pin Configurations and Function Descriptions ........................... 6
Printed Circuit Board Layout Considerations ....................... 14
Typical Performance Characteristics ............................................. 7
Outline Dimensions ....................................................................... 15
Theory of Operation ...................................................................... 10
Ordering Guide .......................................................................... 15
Soft-Start Function (ADP1712) ................................................ 10
REVISION HISTORY
6/09—Rev. 0 to Rev. A
Updated Outline Dimensions ....................................................... 15
Changes to Ordering Guide .......................................................... 15
1/07—Revision 0: Initial Version
Rev. A | Page 2 of 16
ADP1712/ADP1713/ADP1714
SPECIFICATIONS
VIN = (VOUT + 0.5 V) or 2.5 V (whichever is greater), IOUT = 10 mA, CIN = COUT = 2.2 μF, TA = 25°C, unless otherwise noted.
Table 1.
Parameter
INPUT VOLTAGE RANGE
OPERATING SUPPLY CURRENT
Symbol
VIN
IGND
SHUTDOWN CURRENT
IGND-SD
FIXED OUTPUT VOLTAGE
ACCURACY (ADP1712 FIXED,
ADP1713, AND ADP1714)
ADJUSTABLE OUTPUT VOLTAGE
ACCURACY (ADP1712 ADJUSTABLE) 1
LINE REGULATION
LOAD REGULATION 2
VOUT
∆VOUT/∆VIN
∆VOUT/∆IOUT
DROPOUT VOLTAGE 3
VDROPOUT
VOUT
Conditions
TJ = –40°C to +125°C
IOUT = 0 μA
IOUT = 0 μA, TJ = –40°C to +125°C
IOUT = 100 μA
IOUT = 100 μA, TJ = –40°C to +125°C
IOUT = 100 mA
IOUT = 100 mA, TJ = –40°C to +125°C
IOUT = 300 mA
IOUT = 300 mA, TJ = –40°C to +125°C
EN = GND
EN = GND, TJ = –40°C to +125°C
IOUT = 10 mA
100 μA < IOUT < 300 mA, TJ = –40°C to +125°C
Min
2.5
IOUT = 10 mA
100 μA < IOUT < 300 mA, TJ = –40°C to +125°C
VIN = (VOUT + 0.5 V) to 5.5 V, TJ = –40°C to +125°C
IOUT = 10 mA to 300 mA
IOUT = 10 mA to 300 mA, TJ = –40°C to +125°C
IOUT = 100 mA, VOUT ≥ 3.0 V
IOUT = 100 mA, VOUT ≥ 3.0 V, TJ = –40°C to +125°C
IOUT = 300 mA, VOUT ≥ 3.0 V
IOUT = 300 mA, VOUT ≥ 3.0 V, TJ = –40°C to +125°C
IOUT = 100 mA, 2.5 V ≤ VOUT < 3.0 V
IOUT = 100 mA, 2.5 V ≤ VOUT < 3.0 V, TJ = –40°C to
+125°C
IOUT = 300 mA, 2.5 V ≤ VOUT < 3.0 V
IOUT = 300 mA, 2.5 V ≤ VOUT < 3.0 V, TJ = –40°C to
+125°C
0.792
0.784
–0.25
Typ
Max
5.5
60
70
75
85
210
250
365
420
0.1
1.0
+1
+2
–1
–2
0.8
0.8
0.808
0.816
+0.25
0.004
70
80
205
230
85
95
V
V
%/ V
%/mA
%/mA
mV
mV
mV
mV
mV
mV
235
270
mV
mV
700
μs
ms
μs
mA
0.001
60
170
70
200
START-UP TIME 4
ADP1712 Adjustable and ADP1714
ADP1712 External Soft Start
ADP1713
CURRENT LIMIT THRESHOLD 5
THERMAL SHUTDOWN THRESHOLD
ILIMIT
TSSD
THERMAL SHUTDOWN HYSTERESIS
TSSD-HYS
SOFT-START SOURCE CURRENT
(ADP1712 WITH EXTERNAL
SOFT START)
UVLO ACTIVE THRESHOLD
UVLO INACTIVE THRESHOLD
UVLO HYSTERESIS
VOUT to VTRK ACCURACY (ADP1714)
SSI-SOURCE
SS = GND
0.8
UVLOACTIVE
UVLOINACTIVE
UVLOHYS
VTRK-ERROR
VIN falling
VIN rising
2
Unit
V
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
%
%
TSTART-UP
CSS = 10 nF
With 10 nF bypass capacitor
380
TJ rising
70
7.3
90
500
150
°C
15
1.2
1.5
–40
+40
V
V
mV
mV
–80
+80
mV
2.45
250
0 V ≤ VTRK ≤ (0.5 × VOUT(NOM)), VOUT(NOM) ≤ 1.8 V,
TJ = –40°C to +125°C
0 V ≤ VTRK ≤ (0.5 × VOUT(NOM)), VOUT(NOM) > 1.8 V,
TJ = –40°C to +125°C
Rev. A | Page 3 of 16
°C
μA
ADP1712/ADP1713/ADP1714
Parameter
EN INPUT LOGIC HIGH
EN INPUT LOGIC LOW
EN INPUT LEAKAGE CURRENT
ADJ INPUT BIAS CURRENT
(ADP1712 ADJUSTABLE)
OUTPUT NOISE
ADP1713
ADP1712 and ADP1714
POWER SUPPLY REJECTION RATIO
ADP1713
ADP1712 and ADP1714
Symbol
VIH
VIL
VI-LEAKAGE
ADJI-BIAS
Conditions
2.5 V ≤ VIN ≤ 5.5 V
2.5 V ≤ VIN ≤ 5.5 V
EN = IN or GND
Min
1.8
Typ
Max
0.1
30
0.4
1
100
Unit
V
V
μA
nA
OUTNOISE
10 Hz to 100 kHz, VIN = 5.0 V, VOUT = 0.75 V,
with 10 nF bypass capacitor
10 Hz to 100 kHz, VIN = 5.0 V, VOUT = 3.3 V
40
μV rms
380
μV rms
1 kHz, VIN = 5.0 V, VOUT = 0.75 V, with 10 nF
bypass capacitor
1 kHz, VIN = 5.0 V, VOUT = 3.3 V
72
dB
65
dB
PSRR
1
Accuracy when OUT is connected directly to ADJ. When OUT voltage is set by external feedback resistors, absolute accuracy in adjust mode depends on the tolerances
of resistors used.
2
Based on an end-point calculation using 10 mA and 300 mA loads. See Figure 10 for typical load regulation performance for loads less than 10 mA.
3
Dropout voltage is defined as the input-to-output voltage differential when the input voltage is set to the nominal output voltage. This applies only for output
voltages above 2.5 V.
4
Start-up time is defined as the time between the rising edge of EN to OUT being at 95% of its nominal value.
5
Current limit threshold is defined as the current at which the output voltage drops to 90% of the specified typical value. For example, the current limit for a 1.0 V
output voltage is defined as the current that causes the output voltage to drop to 90% of 1.0 V, or 0.9 V.
Rev. A | Page 4 of 16
ADP1712/ADP1713/ADP1714
ABSOLUTE MAXIMUM RATINGS
THERMAL RESISTANCE
Table 2.
Parameter
IN to GND
OUT to GND
EN to GND
SS/ADJ/BYP/TRK to GND
Storage Temperature Range
Operating Junction Temperature Range
Lead Temperature, Soldering (10 sec)
Soldering Conditions
Rating
–0.3 V to +6 V
–0.3 V to IN
–0.3 V to +6 V
–0.3 V to +6 V
–65°C to +150°C
–40°C to +125°C
300°C
JEDEC J-STD-020
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type
5-Lead TSOT
ESD CAUTION
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Rev. A | Page 5 of 16
θJA
170
Unit
°C/W
ADP1712/ADP1713/ADP1714
IN 1
OUT
TOP VIEW
(Not to Scale)
GND 2
4
SS
Figure 5. 5-Lead TSOT (UJ-Suffix)
EN 3
ADP1712
5
IN 1
OUT
ADJUSTABLE
TOP VIEW
(Not to Scale)
GND 2
4
ADJ
Figure 6. 5-Lead TSOT (UJ-Suffix)
EN 3
ADP1713
5
OUT
IN 1
GND 2
TOP VIEW
(Not to Scale)
4
BYP
06455-007
EN 3
5
FIXED
06455-006
GND 2
ADP1712
06455-005
IN 1
Figure 7. 5-Lead TSOT (UJ-Suffix)
EN 3
ADP1714
5
OUT
4
TRK
TOP VIEW
(Not to Scale)
06455-008
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
Figure 8. 5-Lead TSOT (UJ-Suffix)
Table 4. Pin Function Descriptions
ADP1712
Fixed
Pin No.
1
2
3
ADP1712
Adjustable
Pin No.
1
2
3
ADP1713
Pin No.
1
2
3
ADP1714
Pin No.
1
2
3
4
SS
4
ADJ
BYP
4
5
Mnemonic
IN
GND
EN
5
5
4
TRK
5
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. A | Page 6 of 16
ADP1712/ADP1713/ADP1714
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.8 V, IOUT = 10 mA, CIN = COUT = 2.2 μF, TA = 25°C, unless otherwise noted.
3.32
450
ILOAD = 300mA
400
3.31
350
ILOAD = 200mA
3.29
3.28
ILOAD
ILOAD
ILOAD
ILOAD
ILOAD
ILOAD
3.27
= 100µA
= 1mA
= 10mA
= 100mA
= 200mA
= 300mA
3.26
–40
250
ILOAD = 100mA
200
150
ILOAD = 10mA
100
ILOAD = 1mA
50
10
60
110
TJ (°C)
ILOAD = 100µA
0
–40
10
60
110
06455-012
IGND (µA)
300
06455-009
VOUT (V)
3.30
TJ (°C)
Figure 9. Output Voltage vs. Junction Temperature
Figure 12. Ground Current vs. Junction Temperature
3.304
400
3.302
350
300
3.300
IGND (µA)
VOUT (V)
250
3.298
3.296
200
150
3.294
100
3.292
1
10
1000
100
ILOAD (mA)
0
0.1
06455-010
3.290
0.1
1
10
1000
100
ILOAD (mA)
Figure 10. Output Voltage vs. Load Current
06455-013
50
Figure 13. Ground Current vs. Load Current
3.305
500
450
3.300
400
ILOAD = 300mA
IGND (µA)
3.295
3.290
3.280
3.3
250
ILOAD = 100mA
200
ILOAD = 10mA
150
= 100µA
= 1mA
= 10mA
= 100mA
= 200mA
= 300mA
3.8
ILOAD = 200mA
300
ILOAD = 1mA
100
ILOAD = 100µA
50
4.3
4.8
VIN (V)
5.3
Figure 11. Output Voltage vs. Input Voltage
0
3.3
3.8
4.3
4.8
VIN (V)
Figure 14. Ground Current vs. Input Voltage
Rev. A | Page 7 of 16
5.3
06455-014
3.285
ILOAD
ILOAD
ILOAD
ILOAD
ILOAD
ILOAD
06455-011
VOUT (V)
350
ADP1712/ADP1713/ADP1714
180
160
120
LOAD SWITCHED FROM 10mA TO 300mA
100
20mV/DIV
VDROPOUT (mV)
140
80
60
VOUT
VIN = 5V
VOUT = 3.3V
CIN = 2.2μF
COUT = 2.2μF
0
0.1
1
10
1000
100
ILOAD (mA)
06455-015
20
TIME (20μs/DIV)
Figure 15. Dropout Voltage vs. Load Current
06455-018
40
Figure 18. Load Transient Response
3.35
3.30
LOAD SWITCHED FROM 10mA TO 300mA
3.15
ILOAD
ILOAD
ILOAD
ILOAD
ILOAD
ILOAD
3.10
3.05
3.00
3.20
3.25
3.30
3.35
3.40
3.45
VOUT
= 100µA
= 1mA
= 10mA
= 100mA
= 200mA
= 300mA
3.50
3.55
3.60
VIN (V)
VIN = 5V
VOUT = 3.3V
CIN = 10μF
COUT = 10μF
TIME (20μs/DIV)
06455-019
20mV/DIV
3.20
06455-016
VOUT (V)
3.25
Figure 19. Load Transient Response
Figure 16. Output Voltage vs. Input Voltage (in Dropout)
1000
ILOAD =
300mA
900
800
VIN STEP FROM 4V TO 5V
ILOAD =
10mA
300
ILOAD =
200mA
200
100
ILOAD = 1mA
ILOAD = 100µA
0
3.20
3.25
3.30
3.35
3.40
3.45
3.50
3.55
VIN (V)
3.60
1
2
VIN = 5V
VOUT = 3.3V
CIN = 10μF
COUT = 10μF
ILOAD = 300mA
VOUT
TIME (100μs/DIV)
Figure 20. Line Transient Response
Figure 17. Ground Current vs. Input Voltage (in Dropout)
Rev. A | Page 8 of 16
06455-020
400
ILOAD =
100mA
2V/DIV
500
10mV/DIV
600
06455-017
IGND (µA)
700
ADP1712/ADP1713/ADP1714
16
–50
VRIPPLE = 50mV
ILOAD = 10mA
COUT = 2.2μF
FREQUENCY = 10kHz
14
–55
10
PSRR (dB)
8
6
VOUT = 2.4V
–60
VOUT = 1.6V
–65
4
2
5
10
15
20
25
CSS (nF)
–70
2.7
Figure 21. Output Voltage Ramp-Up Time vs. Soft-Start Capacitor Value
–20
4.2
4.7
Figure 23. ADP1712 Adjustable Power Supply Rejection Ratio vs.
Input Voltage
–45
VRIPPLE = 50mV
VIN = 5V
VOUT = 0.75V
COUT = 2.2μF
–50
VRIPPLE = 50mV
VIN = 5V
COUT = 2.2μF
FREQUENCY = 10kHz
ILOAD = 100mA
ILOAD = 100mA
ILOAD = 10mA
PSRR (dB)
–30
–40
–50
–55
ILOAD = 10mA
–60
–60
ILOAD = 1mA
–70
–65
–80
–90
10
ILOAD = 100µA
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
06455-037
PSRR (dB)
3.7
VIN (V)
0
–10
3.2
06455-038
0
06455-036
0
VOUT = 0.8V
–70
0.8
1.3
1.8
2.3
2.8
3.3
3.8
4.3
VOUT (V)
Figure 24. ADP1712 Adjustable Power Supply Rejection Ratio vs.
Output Voltage
Figure 22. ADP1713 Power Supply Rejection Ratio vs. Frequency
(10 nF Bypass Capacitor)
Rev. A | Page 9 of 16
06455-039
RAMP-UP TIME (ms)
12
ADP1712/ADP1713/ADP1714
THEORY OF OPERATION
The ADP1712/ADP1713/ADP1714 are low dropout linear regulators that use an advanced, proprietary architecture to provide high
power supply rejection ratio (PSRR) and excellent line and load
transient response with just a small 2.2 μF ceramic output capacitor. All devices operate from a 2.5 V to 5.5 V input rail and provide
up to 300 mA of output current. Incorporating a novel scaling
architecture, ground current is very low when driving light loads.
Ground current in the shutdown mode is typically less than 1 μA.
IN
For applications that require a controlled startup, the ADP1712
provides a programmable soft-start function. Programmable soft
start is useful for reducing inrush current upon startup and for providing voltage sequencing. To implement soft start, connect a small
ceramic capacitor from SS to GND. Upon startup, a 1.2 μA current
source charges this capacitor. The ADP1712 start-up output voltage
is limited by the voltage at SS, providing a smooth ramp up to the
nominal output voltage. The soft-start time is calculated by
TSS = VREF × (CSS/ISS)
OUT
(1)
where:
TSS is the soft-start period.
VREF is the 0.8 V reference voltage.
CSS is the soft-start capacitance from SS to GND.
ISS is the current sourced from SS (1.2 μA).
CURRENT
LIMIT
THERMAL
PROTECT
REFERENCE
GND
When the ADP1712 is disabled (using EN), the soft-start capacitor
is discharged to GND through an internal 100 Ω resistor.
SS/
ADJ/
BYP/
TRK
06455-023
SHUTDOWN
AND UVLO
EN
SOFT-START FUNCTION (ADP1712)
EN
VIN = 5V
VOUT = 3.3V
COUT = 2.2μF
CSS = 22nF
ILOAD = 300mA
2
TIME (4ms/DIV)
06455-040
2V/DIV
OUT
Figure 26. OUT Ramp-Up with External Soft-Start Capacitor
The ADP1712 adjustable version, ADP1713, and ADP1714 have
no pins for soft start, so the function is switched to an internal
soft-start capacitor. This sets the soft-start ramp-up period to
approximately 24 μs.
Rev. A | Page 10 of 16
1
2
VIN = 5V
VOUT = 1.6V
COUT = 2.2μF
ILOAD = 10mA
OUT
TIME (20µs/DIV)
Figure 27. OUT Ramp-Up with Internal Soft-Start
06455-041
A logic on the EN pin determines if the output is active. When EN
is high, the output is on, and when EN is low, the output is off.
EN
2V/DIV
The ADP1712 is available in two versions, one with a fixed output
voltage and one with an adjustable output voltage. The fixed output
voltage is set internally to one of sixteen values between 0.75 V and
3.3 V, using an internal feedback network. The adjustable output
voltage can be set to between 0.8 V and 5.0 V by an external voltage
divider connected from OUT to ADJ. The ADP1713 and ADP1714
are available in fixed output voltage options only. The ADP1712
fixed version allows an external soft-start capacitor to be connected
between the SS pin and GND, which controls the output voltage
ramp during startup. The ADP1713 allows a reference bypass
capacitor to be connected between the BYP pin and GND, which
reduces output voltage noise and improves power supply rejection.
The ADP1714 features a track pin, which allows the output voltage
to follow the voltage at the TRK pin.
1
1V/DIV
Internally, the ADP1712/ADP1713/ADP1714 each consist of a
reference, an error amplifier, a feedback voltage divider, and a
PMOS pass transistor. Output current is delivered via the PMOS
pass device, which is controlled by the error amplifier. The error
amplifier compares the reference voltage with the feedback voltage from the output and amplifies the difference. If the feedback
voltage is lower than the reference voltage, the gate of the PMOS
device is pulled lower, which allows more current to pass and
increases the output voltage. If the feedback voltage is higher than
the reference voltage, the gate of the PMOS device is pulled higher,
allowing less current to pass and decreasing the output voltage.
2V/DIV
Figure 25. Internal Block Diagram
ADP1712/ADP1713/ADP1714
ADJUSTABLE OUTPUT VOLTAGE
(ADP1712 ADJUSTABLE)
ENABLE FEATURE
The ADP1712 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)
The ADP1712/ADP1713/ADP1714 use the EN pin to enable
and disable the OUT pin under normal operating conditions.
As shown in Figure 29, 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.
(2)
where:
R1 is the resistor from OUT to ADJ.
R2 is the resistor from ADJ to GND.
EN
BYPASS CAPACITOR (ADP1713)
OUT
1
VIN = 5V
VOUT = 1.6V
COUT = 2.2μF
ILOAD = 10mA
The ADP1713 allows for an external bypass capacitor to be
connected to the internal reference, which reduces output
voltage noise and improves power supply rejection. A low
leakage capacitor of 1 nF or greater (10 nF is recommended)
must be connected between the BYP and GND pins.
TIME (4ms/DIV)
06455-025
500mV/DIV
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.
Figure 29. ADP1712 Adjustable Typical EN Pin Operation
The ADP1714 includes a tracking mode feature. As shown in
Figure 28, 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.
For example, consider an ADP1714 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 postpackage trim, depending on the desired output voltage.
4
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 30 shows typical EN active/inactive thresholds
when the input voltage varies from 2.5 V to 5.5 V.
1.4
1.3
TYPICAL EN THRESHOLDS (V)
TRACK MODE (ADP1714)
1.2
1.1
EN ACTIVE
HYSTERESIS
1.0
0.9
0.8
0.7
EN INACTIVE
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
3
2
UNDERVOLTAGE LOCKOUT (UVLO)
The ADP1712/ADP1713/ADP1714 have an undervoltage
lockout circuit, which monitors the voltage on the IN pin.
When the voltage on IN drops below 2 V (minimum), the
circuit activates, disabling the OUT pin.
1
0
0
1
2
3
4
VTRK (V)
5
06455-024
VOUT (V)
VIN (V)
Figure 30. Typical EN Pin Thresholds vs. Input Voltage
Figure 28. ADP1714 Output Voltage vs. Tracking Voltage
with Nominal Output Voltage Set to 3 V
Rev. A | Page 11 of 16
06455-026
0.6
ADP1712/ADP1713/ADP1714
APPLICATION INFORMATION
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.
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
capacitance. Using 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.
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 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.
The ADP1712/ADP1713/ADP1714 are protected against damage
due to excessive power dissipation by current and thermal overload 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.
VOUT RESPONSE TO LOAD STEP
FROM 10mA TO 300mA
VIN = 5V
VOUT = 3.3V
CIN = 2.2µF
COUT = 2.2µF
TIME (20μs/DIV)
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.
06455-027
20mV/DIV
CURRENT LIMIT AND THERMAL OVERLOAD
PROTECTION
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 temperature 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.
VOUT RESPONSE TO LOAD STEP
FROM 10mA TO 300mA
VIN = 5V
VOUT = 3.3V
CIN = 10µF
COUT = 10µF
TIME (20μs/DIV)
06455-028
20mV/DIV
Figure 31. Output Transient Response, COUT = 2.2 μF
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,
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. A | Page 12 of 16
ADP1712/ADP1713/ADP1714
THERMAL CONSIDERATIONS
140
MAX TJ (DO NOT OPERATE ABOVE THIS POINT)
120
100
TJ (°C)
80
60
40
20
0
0.5
1mA
10mA
1.0
30mA
80mA
1.5
2.0
Table 5.
3.0
3.5
4.0
4.5
5.0
VIN – VOUT (V)
θJA (°C/W)
170
152
146
134
131
Figure 33. 500 mm2 of PCB Copper, TA = 25°C
140
MAX TJ (DO NOT OPERATE ABOVE THIS POINT)
120
100
Device soldered to minimum size pin traces.
The junction temperature of the ADP1712/ADP1713/ADP1714
can be calculated from the following equation:
60
40
(3)
where:
20
TA is the ambient temperature.
PD is the power dissipation in the die, given by
PD = [(VIN – VOUT) × ILOAD] + (VIN × IGND)
80
0
0.5
1.0
30mA
80mA
1.5
2.0
100mA
200mA
2.5
3.0
300mA
(LOAD CURRENT)
3.5
4.0
4.5
5.0
5.0
VIN – VOUT (V)
(4)
Figure 34. 100 mm2 of PCB Copper, TA = 25°C
where:
140
ILOAD is the load current.
IGND is the ground current.
VIN and VOUT are input voltage and output voltage, respectively.
MAX TJ (DO NOT OPERATE ABOVE THIS POINT)
120
100
TJ (°C)
Power dissipation due to ground current is quite small and can
be ignored. Therefore, the junction temperature equation
simplifies to the following:
TJ = TA + {[(VIN – VOUT) × ILOAD] × θJA}
1mA
10mA
06455-030
TJ = TA + (PD × θJA)
TJ (°C)
1
2.5
300mA
(LOAD CURRENT)
06455-031
Copper Size (mm2)
01
50
100
300
500
100mA
200mA
06455-029
To guarantee reliable operation, the junction temperature of the
ADP1712/ADP1713/ADP1714 must not exceed 125°C. To
ensure the junction temperature stays below this maximum value,
the user needs to be aware of the parameters that contribute to
junction temperature changes. These parameters include ambient
temperature, power dissipation in the power device, and thermal
resistances between the junction and ambient air (θJA). The θJA
number is dependent on the package assembly compounds used
and the amount of copper to which the GND pin of the package
is soldered on the PCB. Table 5 shows typical θJA values of the
5lead TSOT package for various PCB copper sizes.
(5)
As shown in Equation 4, for a given ambient temperature, inputto-output voltage differential, and continuous load current,
there exists a minimum copper size requirement for the PCB to
ensure the junction temperature does not rise above 125°C. The
following figures show junction temperature calculations for
different ambient temperatures, load currents, input-to-output
voltage differentials, and areas of PCB copper.
Rev. A | Page 13 of 16
80
60
40
20
0
0.5
1mA
10mA
1.0
30mA
80mA
1.5
2.0
100mA
200mA
2.5
3.0
300mA
(LOAD CURRENT)
3.5
4.0
VIN – VOUT (V)
Figure 35. 0 mm2 of PCB Copper, TA = 25°C
4.5
ADP1712/ADP1713/ADP1714
PRINTED CIRCUIT BOARD LAYOUT
CONSIDERATIONS
140
MAX TJ (DO NOT OPERATE ABOVE THIS POINT)
120
Heat dissipation from the package can be improved by increasing
the amount of copper attached to the pins of the ADP1712/
ADP1713/ADP1714. However, as can be seen from Table 5, a
point of diminishing returns eventually is reached, beyond
which an increase in the copper size does not yield significant
heat dissipation benefits.
TJ (°C)
100
80
60
40
20
1mA
10mA
1.0
30mA
80mA
1.5
2.0
100mA
200mA
2.5
3.0
300mA
(LOAD CURRENT)
3.5
4.0
4.5
5.0
VIN – VOUT (V)
06455-032
0
0.5
Figure 36. 500 mm2 of PCB Copper, TA = 50°C
140
MAX TJ (DO NOT OPERATE ABOVE THIS POINT)
Place the input capacitor as close as possible to the IN and GND
pins. Place the output capacitor as close as possible to the OUT
and GND pins. For the ADP1712 adjustable version, place the
soft-start capacitor as close as possible to the SS pin. For the
ADP1713, place the internal reference bypass capacitor as close
as possible to the BYP pin. Use of 0402 or 0603 size capacitors
and resistors achieves the smallest possible footprint solution on
boards where area is limited.
GND (BOTTOM)
120
GND (TOP)
TJ (°C)
100
80
ADP1712/
ADP1713/
ADP1714
60
40
C1
C2
20
1.0
30mA
80mA
1.5
2.0
100mA
200mA
2.5
3.0
300mA
(LOAD CURRENT)
3.5
4.0
4.5
5.0
VIN – VOUT (V)
06455-033
0
0.5
1mA
10mA
IN
OUT
SS/
ADJ/
BYP/
TRK
Figure 37. 100 mm2 of PCB Copper, TA = 50°C
140
C3
MAX TJ (DO NOT OPERATE ABOVE THIS POINT)
120
R2
06455-035
80
Figure 39. Example PCB Layout
60
40
20
1mA
10mA
1.0
30mA
80mA
1.5
2.0
100mA
200mA
2.5
3.0
300mA
(LOAD CURRENT)
3.5
4.0
VIN – VOUT (V)
4.5
5.0
06455-034
TJ (°C)
100
0
0.5
R1
EN
Figure 38. 0 mm2 of PCB Copper, TA = 50°C
Rev. A | Page 14 of 16
ADP1712/ADP1713/ADP1714
OUTLINE DIMENSIONS
2.90 BSC
5
4
2.80 BSC
1.60 BSC
1
2
3
0.95 BSC
1.90
BSC
*1.00 MAX
0.10 MAX
0.50
0.30
0.20
0.08
SEATING
PLANE
8°
4°
0°
*COMPLIANT TO JEDEC STANDARDS MO-193-AB WITH
THE EXCEPTION OF PACKAGE HEIGHT AND THICKNESS.
0.60
0.45
0.30
100708-A
*0.90 MAX
0.70 MIN
Figure 40. 5-Lead Thin Small Outline Transistor Package [TSOT]
(UJ-5)
Dimensions shown in millimeters
ORDERING GUIDE
Model
ADP1712AUJZ-0.75R71
ADP1712AUJZ-0.8-R71
ADP1712AUJZ-0.85R71
ADP1712AUJZ-0.9-R71
ADP1712AUJZ-0.95R71
ADP1712AUJZ-1.0-R71
ADP1712AUJZ-1.05R71
ADP1712AUJZ-1.1-R71
ADP1712AUJZ-1.15R71
ADP1712AUJZ-1.2-R71
ADP1712AUJZ-1.3-R71
ADP1712AUJZ-1.5-R71
ADP1712AUJZ-1.8-R71
ADP1712AUJZ-2.5-R71
ADP1712AUJZ-3.0-R71
ADP1712AUJZ-3.3-R71
ADP1712AUJZ-R7 1
ADP1713AUJZ-0.75R71
ADP1713AUJZ-0.8-R71
ADP1713AUJZ-0.85R71
ADP1713AUJZ-0.9-R71
ADP1713AUJZ-0.95R71
ADP1713AUJZ-1.0-R71
ADP1713AUJZ-1.05R71
ADP1713AUJZ-1.1-R71
ADP1713AUJZ-1.15R71
ADP1713AUJZ-1.2-R71
Temperature
Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Output
Voltage (V)
0.75
0.80
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
1.30
1.50
1.80
2.50
3.00
3.30
0.8 to 5
0.75
0.80
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
Package
Description
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
Rev. A | Page 15 of 16
Package
Option
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
Branding
L3S
L3T
L3U
L3V
L3W
L3X
L3Y
L3Z
L4H
L4J
L4K
L4L
L4M
L4N
L4P
L4Q
L4R
L4U
L4V
L4W
L4X
L4Y
L4Z
L50
L51
L52
L53
ADP1712/ADP1713/ADP1714
Model
ADP1713AUJZ-1.3-R71
ADP1713AUJZ-1.5-R71
ADP1713AUJZ-1.8-R71
ADP1713AUJZ-2.5-R71
ADP1713AUJZ-3.0-R71
ADP1713AUJZ-3.3-R71
ADP1714AUJZ-0.75R71
ADP1714AUJZ-0.8-R71
ADP1714AUJZ-0.85R71
ADP1714AUJZ-0.9-R71
ADP1714AUJZ-0.95R71
ADP1714AUJZ-1.0-R71
ADP1714AUJZ-1.05R71
ADP1714AUJZ-1.1-R71
ADP1714AUJZ-1.15R71
ADP1714AUJZ-1.2-R71
ADP1714AUJZ-1.3-R71
ADP1714AUJZ-1.5-R71
ADP1714AUJZ-1.8-R71
ADP1714AUJZ-2.5-R71
ADP1714AUJZ-3.0-R71
ADP1714AUJZ-3.3-R71
ADP1712-3.3-EVALZ11
ADP1712-EVALZ11
Temperature
Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Output
Voltage (V)
1.30
1.50
1.80
2.50
3.00
3.30
0.75
0.80
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
1.30
1.50
1.80
2.50
3.00
3.30
3.3
ADP1713-3.3-EVALZ11
Adjustable,
but set to 1.6
3.3
ADP1714-3.3-EVALZ11
3.3
1
Package
Description
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
ADP1712 Fixed 3.3 V Output with Soft Start
Evaluation Board
ADP1712 Adjustable Output Evaluation Board
ADP1713 Fixed 3.3 V Output with Bypass
Evaluation Board
ADP1714 Fixed 3.3 V Output with Track Mode
Evaluation Board
Z = RoHS Compliant Part.
©2007–2009 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D06455-0-6/09(A)
Rev. A | Page 16 of 16
Package
Option
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
UJ-5
Branding
L54
L55
L56
L57
L58
L59
L5A
L5C
L5D
L5E
L5F
L5G
L5H
L5J
L5K
L5L
L5M
L5N
L5P
L5Q
L5R
L5S