50 mA, High Voltage,
Micropower Linear Regulator
Data Sheet
ADP1720-EP
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 ©2011–2012 Analog Devices, Inc. All rights reserved.
FEATURES
Wide input voltage range: 4 V to 28 V
Maximum output current: 50 mA
Low light load current
28 µA at 0 µA load
35 µA at 100 µA load
Low shutdown current: 0.7 µA
Low dropout voltage: 275 mV @ 50 mA load
Initial accuracy: ±0.5%
Accuracy over line, load, and temperature: ±2%
Stable with small 1 µF ceramic output capacitor
Fixed 3.3 V and 5.0 V output voltage options
Adjustable output voltage option: 1.225 V to 5.0 V
Current limit and thermal overload protection
Logic controlled enable
Space-saving MSOP package
ENHANCED PRODUCT FEATURES
Enhanced processing (EP) for −55°C to +125°C operation
APPLICATIONS
DC-to-dc post regulation
PCMCIA regulation
Keep-alive power in portable equipment
Industrial applications
Aeronautic and military operating temperature environment
TYPICAL APPLICATION CIRCUITS
GND
1
GND
2
GND
3
GND
4
8
7
6
GND
IN
OUT
EN
5
ADP1720-EP
FIXED
V
IN
= 28V
V
OUT
= 5V
1µF
1µF
09723-001
Figure 1. ADP1720-EP with Fixed Output Voltage, 5.0 V
GND
1
GND
2
GND
3
GND
4
8
7
6
ADJ
IN
OUT
EN 5
ADP1720-EP
ADJUSTABLE
VIN = 12V
VOUT =
1.225V ( 1 + R1/R2)
1µF
1µF
R1
R2
09723-002
Figure 2. ADP1720-EP with Adjustable Output Voltage, 1.225 V to 5.0 V
GENERAL DESCRIPTION
The ADP1720-EP is a high voltage, micropower, low dropout
linear regulator. Operating over a very wide input voltage range
of 4 V to 28 V, t h e ADP1720-EP can provide up to 50 mA of
output current. With just 28 µA of quiescent supply current and a
micropower shutdown mode, this device is ideal for applications
that require low quiescent current.
The ADP1720-EP is available in fixed output voltages of 3.3 V
and 5.0 V. An adjustable version is also available, which allows
the output to be set anywhere between 1.225 V and 5.0 V. An
enable function that allows external circuits to turn on and turn
off the ADP1720 output is available. For automatic startup, the
enable (EN) pin can be connected directly to the input rail.
The ADP1720-EP is optimized for stable operation with small
1 µF ceramic output capacitors, allowing for good transient
performance while occupying minimal board space.
The ADP1720-EP operates from –55°C to +125°C and uses
current limit protection and thermal overload protection
circuits to prevent damage to the device in adverse conditions.
Available in a small MSOP package, the ADP1720-EP provides
a compact solution with low thermal resistance.
Additional application and technical information can be found
in the ADP1720 data sheet.
ADP1720-EP Data Sheet
Rev. A | Page 2 of 12
TABLE OF CONTENTS
Features .............................................................................................. 1
Enhanced Product Features ............................................................ 1
Applications ....................................................................................... 1
Typical Application Circuits ............................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance .......................................................................5
ESD Caution...................................................................................5
Pin Configurations and Function Descriptions ............................6
Typical Performance Characteristics ..............................................7
Applications Information .............................................................. 10
Thermal Considerations ............................................................ 10
Outline Dimensions ....................................................................... 12
Ordering Guide .......................................................................... 12
REVISION HISTORY
6/12—Rev. 0 to Rev. A
Changes to Ordering Guide .......................................................... 12
2/11—Revision 0: Initial Version
Data Sheet ADP1720-EP
Rev. A | Page 3 of 12
SPECIFICATIONS
VIN = 12 V, I OUT = 100 µA, CIN = COUT = 1 µF, TA = 25°C, unless otherwise noted.
Table 1.
Parameter Symbol Conditions Min Typ Max Unit
INPUT VOLTAGE RANGE V
IN
T
= –55°C to +125°C 4 28 V
OPERATING SUPPLY CURRENT
IGND
28
µA
OUT
IN
OUT
greater), T
= –55°C to +125°C
80
µA
I
= 100 µA 35 µA
IOUT = 100 µA, VIN = VOUT + 0.5 V or 4 V (whichever is
greater), T
= –55°C to +125°C
120 µA
I
= 1 mA 74 µA
IOUT = 1 mA, VIN = VOUT + 0.5 V or 4 V (whichever is
greater), T
= –55°C to +125°C
340 µA
I
= 10 mA 300 µA
IOUT = 10 mA, VIN = VOUT + 0.5 V or 4 V (whichever is
greater), T
= –55°C to +125°C
900 µA
100 µA < IOUT < 50 mA, VIN = VOUT + 0.5 V or 4 V
(whichever is greater), T
= –55°C to +125°C
1185 2115 µA
SHUTDOWN CURRENT I
GND-SD
EN = GND 0.7 µA
EN = GND, T
= –55°C to +125°C 1.7 µA
OUTPUT
Fixed Output
VOUT
–0.5
+0.5
%
Voltage Accuracy 100 µA < I
< 50 mA –1 +1 %
–2
+2
%
Adjustable Output1
VOUT
1.2188
1.2250
1.2311
V
Voltage Accuracy
1.2127
1.2372
V
1.2005
1.2495
V
Noise (10 Hz to 100 kHz) OUT
NOISE
V
= 1.6 V, C
= 1 µF 146 µV rms
V
= 1.6 V, C
= 10 µF 124 µV rms
OUT
OUT
340 µV rms
266 µV rms
REGULATION
Line Regulation ∆V
OUT
/∆V
IN
V
= (V
+ 0.5 V) to 28 V, T
= –55°C to +125°C –0.02 +0.02 %/V
Load Regulation
2
∆V
OUT
/∆I
OUT
1 mA < I
< 50 mA 0.001 %/mA
1 mA < I
< 50 mA, T
= –55°C to +125°C 0.005 %/mA
DROPOUT VOLTAGE
3
V
DROPOUT
I
= 10 mA 55 mV
I
= 10 mA, T
= –55°C to +125°C 105 mV
I
= 50 mA 275 mV
I
= 50 mA, T
= –55°C to +125°C 480 mV
START-UP TIME
4
t
START-UP
200 µs
CURRENT LIMIT THRESHOLD5
ILIMIT
55
90
140
mA
THERMAL CHARACTERISTICS
Thermal Shutdown
Threshold
TSSD TJ rising 150 °C
Thermal Shutdown
Hysteresis
TSSD-HYS 15 °C
EN CHARACTERISTICS
EN Input
Logic High V
IH
4 V ≤ V
≤ 28 V 1.8 V
Logic Low V
IL
4 V ≤ V
≤ 28 V 0.4 V
Leakage Current
VI-LEAKAGE
0.1
1
µA
0.5
1
µA
ADJ INPUT BIAS CURRENT
(ADP1720-EP ADJUSTABLE)
ADJI-BIAS 30 100 nA
ADP1720-EP Data Sheet
Rev. A | Page 4 of 12
Parameter Symbol Conditions Min Typ Max Unit
POWER SUPPLY REJECTION RATIO
PSRR
–90
dB
–80
dB
–60
dB
f = 120 Hz, V
= 8 V, V
= 5 V –83 dB
–70
dB
f = 10 kHz, V
= 8 V, V
= 5 V –50 dB
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 1 mA and 50 mA loads. See Figure 6 for typical load regulation performance for loads less than 1 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 4 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 5.0 V
output voltage is defined as the current that causes the output voltage to drop to 90% of 5.0 V, or 4.5 V.
Data Sheet ADP1720-EP
Rev. A | Page 5 of 12
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
IN to GND –0.3 V to +30 V
OUT to GND
–0.3 V to IN or +6 V
(whichever is less)
EN to GND –0.3 V to +30 V
ADJ to GND –0.3 V to +6 V
Storage Temperature Range –65°C to +150°C
Operating Junction
Temperature Range
–55°C to +125°C
Soldering Conditions JEDEC J-STD-020
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.
THERMAL RESISTANCE
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 θ
JA
θ
JC
Unit
8-Lead MSOP 246 66 °C/W
ESD CAUTION
ADP1720-EP Data Sheet
Rev. A | Page 6 of 12
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
GND
GND
GND
GND
GND
IN
OUT
EN
1
2
3
4
8
7
6
5
ADP1720-EP
FIXED
TOP VIEW
(Not t o Scale)
09723-003
GND
GND
GND
GND
ADJ
IN
OUT
EN
1
2
3
4
8
7
6
5
09723-004
ADP1720-EP
ADJUSTABLE
TOP VIEW
(Not t o Scale)
Figure 3. 8-Lead MSOP Pin Configuration—Fixed Output Voltage Figure 4. 8-Lead MSOP Pin Configuration—Adjustable Output Voltage
Table 4. Pin Function Descriptions
Pin No.
Fixed Adjustable Mnemonic Description
1 N/A GND This pin is internally connected to ground.
N/A 1 ADJ Adjust. A resistor divider from OUT to ADJ sets the output voltage.
2
2
IN
Regulator Input Supply. Bypass IN to GND with a 1 µF or greater capacitor.
3 3 OUT Regulated Output Voltage. Bypass OUT to GND with a 1 µF or greater capacitor.
4 4 EN
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.
5 5 GND Ground.
6 6 GND Ground.
7 7 GND Ground.
8 8 GND Ground.
Data Sheet ADP1720-EP
Rev. A | Page 7 of 12
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12 V, VOUT = 5 V, IOUT = 100 µA, CIN = COUT = 1 µF, TA = 25°C, unless otherwise noted.
4.97
4.98
4.99
5.00
5.01
5.02
5.03
–60 –30 030 60 90 120
V
OUT
(V)
JUNCTION TE M P E R ATURE ( °C)
I
LOAD
= 10µA
I
LOAD
= 100µA
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 25mA
I
LOAD
= 50mA
09723-005
Figure 5. Output Voltage vs. Junction Temperature
4.9885
4.9890
4.9895
4.9900
4.9905
4.9910
4.9915
4.9920
4.9925
0.01 0.1 110 100
VOUT (V)
ILOAD (mA)
09723-006
Figure 6. Output Voltage vs. Load Current
5.010
4.990 030
V
IN
(V)
V
OUT
(V)
5.008
5.006
5.004
5.002
5.000
4.998
4.996
4.994
4.992
510 15 20 25
I
LOAD
= 10µA
I
LOAD
= 100µA
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 25mA
I
LOAD
= 50mA
09723-007
Figure 7. Output Voltage vs. Input Voltage
0
200
400
600
800
1000
1200
–60 –30 030 60 90 120
IGND (µA)
JUNCTION TE M P E R ATURE ( °C)
ILOAD = 50mA
ILOAD = 25mA
ILOAD = 10mA
ILOAD = 1mA
ILOAD = 100µA
ILOAD = 10µA
09723-008
Figure 8. Ground Current vs. Junction Temperature
1200
0
0.01 100
ILOAD (mA)
IGND (µA)
0.1 110
1000
800
600
400
200
09723-009
Figure 9. Ground Current vs. Load Current
1400
0030
V
IN
(V)
I
GND
(µA)
1200
1000
800
600
400
200
510 15 20 25
I
LOAD
= 50mA
I
LOAD
= 25mA
I
LOAD
= 10mA
I
LOAD
= 1mA
I
LOAD
= 100µA
I
LOAD
= 10µA
09723-010
Figure 10. Ground Current vs. Input Voltage
ADP1720-EP Data Sheet
Rev. A | Page 8 of 12
0
50
100
150
200
250
300
110 100
VDROPOUT (mV)
ILOAD (mA)
09723-011
Figure 11. Dropout Voltage vs. Load Current
4.60
4.65
4.70
4.75
4.80
4.85
4.90
4.95
5.00
5.05
4.9 5.0 5.1 5.2 5.3 5.4
V
OUT
(V)
V
IN
(V)
I
LOAD
= 1mA
I
LOAD
= 50mA
I
LOAD
= 10mA
I
LOAD
= 25mA
09723-012
Figure 12. Output Voltage vs. Input Voltage (in Dropout)
ILOAD =
1mA
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.9 5.0 5.1 5.2 5.3 5.4
IGND (mA)
VIN (V)
ILOAD =
50mA
ILOAD =
10mA
ILOAD =
25mA
09723-013
Figure 13. Ground Current vs. Input Voltage (in Dropout)
0
–10010 10M
FRE QUENCY (Hz)
PSRR ( dB)
100 1k 10k 100k 1M
–10
–20
–30
–40
–50
–60
–70
–80
–90
100µA
10mA
1mA
V
IN
= 8V
V
OUT
= 1.6V
C
OUT
= 1µF
V
RIPPLE
= 50mV
09723-014
Figure 14. Power Supply Rejection Ratio vs. Frequency
(1.6 V Adjustable Output)
Data Sheet ADP1720-EP
Rev. A | Page 9 of 12
0
–10010 10M
FRE QUENCY (Hz)
PSRR ( dB)
100 1k 10k 100k 1M
–10
–20
–30
–40
–50
–60
–70
–80
–90
VIN = 8V
VOUT = 5V
COUT = 1µF
VRIPPLE = 50mV
100µA
10mA
1mA
09723-015
Figure 15. Power Supply Rejection Ratio vs. Frequency
(5.0 V Fixed Output)
TIME (20µs/DIV)
10mV/DIV
1
V
IN
= 12V
V
OUT
= 1.6V
C
IN
= 1µF
C
OUT
= 1µF
LOAD STEP FROM 2. 5mA TO 47.5mA
V
OUT
09723-016
Figure 16. Load Transient Response
TIME (100µs/DIV)
10mV/DIV
2
2V/DIV
1
V
OUT
= 5V
C
IN
= 1µF
C
OUT
= 1µF
I
LOAD
= 50mA
V
IN
STEP FROM 6V TO 7V
V
OUT
09723-017
Figure 17. Line Transient Response
TIME (40µs/DIV)
2V/DIV
2
5V/DIV
1
V
IN
= 12V
V
OUT
= 5V
C
IN
= 1µF
C
OUT
= 1µF
I
LOAD
= 50mA
EN
V
OUT
09723-018
Figure 18. Start-Up Time
ADP1720-EP Data Sheet
Rev. A | Page 10 of 12
APPLICATIONS INFORMATION
THERMAL CONSIDERATIONS
To guarantee reliable operation, the junction temperature of
the ADP1720-EP must not exceed 125°C. To e nsure that 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 tempera-
ture, 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 pins of the package
are soldered on the PCB. Table 5 shows typical θJA values of the
8-lead MSOP package for various PCB copper sizes.
Table 5. Typical θJA Values for ADP1720-EP
Copper Size (mm2)
θJA (°C/W)
25 246
50 216
100 186
300 178
500 169
The junction temperature of the ADP1720-EP can be calculated
from the following equation:
TJ = TA + (PD × θJA) (3)
where:
TA is the ambient temperature.
PD is the power dissipation in the die, given by
PD = [(VIN – VOUT) × ILOAD] + (VIN × IGND) (4)
where:
ILOAD is the load current.
IGND is the ground current.
VIN and VOUT are input and output voltages, respectively.
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} (5)
As shown in Equation 5, for a given ambient temperature,
input-to-output voltage differential, and continuous load
current, there exists a minimum copper size requirement for
the PCB to ensure that the junction temperature does not rise
above 125°C. Figure 19 to Figure 24 show junction temperature
calculations for different ambient temperatures, load currents,
VIN to VOUT differentials, and areas of PCB copper for the
ADP1720-EP.
140
0028
VIN – VOUT (V)
JUNCTION TE M P E R ATURE ( °C)
120
100
80
60
40
20
1mA
5mA 10mA
20mA 30mA
40mA 50mA
(L OAD CURRENT)
4 8 12 16 20 24
MAX T J (DO NOT OPE RAT E ABOVE THIS POINT)
09723-022
Figure 19. 500 mm2 of PCB Copper, TA = 25°C
140
0028
V
IN
– V
OUT
(V)
120
100
80
60
40
20
1mA
5mA 10mA
20mA 30mA
40mA 50mA
(L OAD CURRENT)
4 8 12 16 20 24
MAX T
J
(DO NOT OPERATE ABOVE THI S POINT )
JUNCTION TE M P E R ATURE ( °C)
09723-023
Figure 20. 300 mm2 of PCB Copper, TA = 25°C
140
0028
VIN – VOUT (V)
120
100
80
60
40
20 1mA
5mA 10mA
20mA 30mA
40mA 50mA
(L OAD CURRENT)
4 8 12 16 20 24
MAX T J (DO NOT OPE RAT E ABOVE THIS POINT)
09723-024
JUNCTION TE M P E R ATURE ( °C)
Figure 21. 100 mm2 of PCB Copper, TA = 25°C
Data Sheet ADP1720-EP
Rev. A | Page 11 of 12
140
0028
VIN – VOUT (V)
120
100
80
60
40
20 1mA
5mA 10mA
20mA 30mA
40mA 50mA
(L OAD CURRENT)
4 8 12 16 20 24
MAX T J (DO NOT OPE RAT E ABOVE THIS POINT)
JUNCTION TE M P E R ATURE ( °C)
09723-025
Figure 22. 25 mm2 of PCB Copper, TA = 25°C
140
0028
V
IN
– V
OUT
(V)
120
100
80
60
40
20 1mA
5mA 10mA
20mA 30mA
40mA 50mA
(L OAD CURRENT)
4 8 12 16 20 24
MAX T
J
(DO NOT OPERATE ABOVE THI S POINT )
09723-026
JUNCTION TE M P E R ATURE ( °C)
Figure 23. 500 mm2 of PCB Copper, TA = 50°C
140
0028
V
IN
– VOUT (V)
120
100
80
60
40
20 1mA
5mA 10mA
20mA 30mA
40mA 50mA
(L OAD CURRENT)
4 8 12 16 20 24
MAX T J (DO NOT OPE RAT E ABOVE THIS POINT)
JUNCTION TE M P E R ATURE ( °C)
09723-027
Figure 24. 300 mm2 of PCB Copper, TA = 50°C
140
0028
VIN – VOUT (V)
JUNCTION TE M P E R ATURE ( °C)
120
100
80
60
40
20 1mA
5mA 10mA
20mA 30mA
40mA 50mA
(L OAD CURRENT)
4 8 12 16 20 24
MAX T J (DO NOT OPE RAT E ABOVE THIS POINT)
09723-128
Figure 25. 100 mm2 of PCB Copper, TA = 50°C
140
0028
VIN – VOUT (V)
120
100
80
60
40
20 1mA
5mA 10mA
20mA 30mA
40mA 50mA
(L OAD CURRENT)
4 8 12 16 20 24
MAX T
J
(DO NOT OPERATE ABOVE THI S POINT )
JUNCTION TE M P E R ATURE ( °C)
09723-029
Figure 26. 25 mm2 of PCB Copper, TA = 50°C
ADP1720-EP Data Sheet
Rev. A | Page 12 of 12
OUTLINE DIMENSIONS
COMPLIANT TO JEDEC STANDARDS MO-187-AA
6°
0°
0.80
0.55
0.40
4
8
1
5
0.65 BSC
0.40
0.25
1.10 MAX
3.20
3.00
2.80
COPLANARITY
0.10
0.23
0.09
3.20
3.00
2.80
5.15
4.90
4.65
PIN 1
IDENTIFIER
15° MAX
0.95
0.85
0.75
0.15
0.05
10-07-2009-B
Figure 27. 8-Lead Mini Small Outline Package [MSOP]
(RM-8)
Dimensions shown in millimeters
ORDERING GUIDE
Model1 Temperature Range
Output
Voltage (V) Package Description Package Option Branding
ADP1720TRMZ5-EP –55°C to +125°C 5 8-Lead MSOP RM-8 LKU
ADP1720TRMZ5-EP-R7 –55°C to +125°C 5 8-Lead MSOP RM-8 LKU
ADP1720TRMZ3.3-EP –55°C to +125°C 3.3 8-Lead MSOP RM-8 LKT
ADP1720TRMZ3.3-EPR7 –55°C to +125°C 3.3 8-Lead MSOP RM-8 LKT
ADP1720TRMZ-EP
–55°C to +125°C
1.225 to 5
8-Lead MSOP
RM-8
LG2
ADP1720TRMZ-EP-R7 –55°C to +125°C 1.225 to 5 8-Lead MSOP RM-8 LG2
1 Z = RoHS Compliant Part.
©2011–2012 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D09723-0-6/12(A)