June 2010 Doc ID 14414 Rev 7 1/19
19
ST715XX
ST715XX25, ST715XX33
High input voltage - 85 mA LDO linear regulator
Features
■2.5 V to 24 V input voltage
■Low dropout voltage (500 mV typ. at 85 mA)
■Very low quiescent current (3.8 µA typ. at full
load)
■85 mA guaranteed output current
■Output voltage: fixed or adjustable
■Compatible with ceramic output capacitors
from 0.47 µF to 10 µF
■Internal current limit
■Package DFN8 (3 x 3 mm), SOT23-5L
■Temperature range: -40 °C to 125 °C
Applications
■Mobile phones
■Personal digital assistant (PDAs)
■Cordless phones and similar battery powered
systems
Description
The ST715xx is a high voltage, ultra low
quiescent low drop linear regulator capable of
providing an output current in excess of 85 mA.
The device operates over an input voltage range
spanning from 2.5 V to 24 V, and is also stable
with output ceramic capacitors. Fault condition
protection includes short-circuit current limitation.
The ultra low quiescent current of 3.8 µA at full
load makes it highly suitable for low power
applications and battery powered systems. The
wide input voltage range makes the ST715xx an
ideal solution for low power industrial applications
also. The ST715xx is available in the DFN8 (3 x 3
mm) 8 leads or the SOT23-5.
DFN8 (3 x 3 mm)
SOT23-5L
Table 1. Device summary
Order codes
Output voltage
SOT23-5L Marking DFN8 (3 x 3 mm) Marking
ST715MR 71AD ST715PUR 715AD ADJ
ST715M15R (1) 7115 ST715PU15R (1) 71515 1.5 V
ST715M18R (1) 7118 ST715PU18R (1) 71518 1.8 V
ST715M25R 7125 ST715PU25R 71525 2.5 V
ST715M28R (1) 7128 ST715PU28R (1) 71528 2.8 V
ST715M33R 7133 ST715PU33R 71533 3.3 V
1. Available on request.
www.st.com
Contents ST715XX, ST715XX25, ST715XX33
2/19 Doc ID 14414 Rev 7
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Output voltage selection for adjustable version . . . . . . . . . . . . . . . . . . 8
5.1 External capacitor requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.2 Power dissipation and junction temperature . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
ST715XX, ST715XX25, ST715XX33 Diagram
Doc ID 14414 Rev 7 3/19
1 Diagram
Figure 1. Block diagram
Pin configuration ST715XX, ST715XX25, ST715XX33
4/19 Doc ID 14414 Rev 7
2 Pin configuration
Figure 2. Pin connections (top view)
DFN8 (3x3)
SOT23-5L
Table 2. Pin description (DFN8 3x3 mm)
Symbol Pin for fixed Pin for adjustable Name and function
IN 1 1 Input voltage of the LDO
NC 2, 3, 5, 6, 7,
Exp. pad 2, 3, 6, 7, Exp. pad Not internally connected
GND 4 4 Common ground
FB - 5 Feedback pin
OUT 8 8 Output voltage
Table 3. Pin description (SOT23-5L)
Symbol Pin for fixed Pin for adjustable Name and function
IN 4 4 Input voltage of the LDO
NC 1, 3 3 Not internally connected
GND 2 2 Common ground
FB 1 Feedback pin
OUT 5 5 Output voltage
ST715XX, ST715XX25, ST715XX33 Maximum ratings
Doc ID 14414 Rev 7 5/19
3 Maximum ratings
Note: Absolute maximum ratings are the values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Table 4. Absolute maximum ratings
Symbol Parameter Value Unit
VIN DC input voltage from -0.3 to 26 V
VOUT DC output voltage From -0.3 to VIN+0.3 V
ADJ Adjust pin 4 V
IOUT Continuous output current According to package
power dissipation A
VESD ESD ratings ± 2 kV
PD
Power dissipation DFN package 5 W
Power dissipation SOT23-5 package 1
TSTG Storage temperature range -65 to 150 °C
TOP Operating junction temperature range -40 to 125 °C
Table 5. Thermal data
Symbol Parameter SOT23-5L DFN8 Unit
RthJA Thermal resistance junction-ambient 255 52 °C/W
Electrical characteristics ST715XX, ST715XX25, ST715XX33
6/19 Doc ID 14414 Rev 7
4 Electrical characteristics
TJ = 25 °C, VIN = VOUT(NOM) + 1 V, CIN = 0.1 µF, COUT = 1 µF, IOUT = 1 mA, unless otherwise
specified. (1)
Table 6. Electrical characteristics - adjustable version
Symbol Parameter Test conditions Min. Typ. Max. Unit
VIN Operating input voltage IOUT = 85mA 2.5 24 V
VOUT Output voltage range 1.2 V
IOUT Output current VIN=2.5 to 6V, TJ=-40°C to 125°C 85 mA
VFB
Feedback voltage 1.2 V
VFB accuracy (1) VIN=VOUT+1 to 24V, IOUT =1mA to 85mA,
TJ=-40°C to 125°C -4.0 4.0 %
ΔVOUT Line regulation VIN=VOUT+1 to 24V, IOUT=1mA,
TJ=-40°C to 125°C 0.001 0.004 %/V
ΔVOUT Load regulation IOUT =1mA to 85mA, TJ=-40°C to 125°C 0.002 0.004 %/mA
eNOutput noise voltage (2) 200Hz to 100kHz, IOUT = 50mA, COUT=
10µF, TJ=-40°C to 125°C, VOUT=1.2V 95 µVRMS
SVR Supply voltage rejection
VIN=VOUTNOM+1V+/-VRIPPLE,
VRIPPLE=0.2V, IOUT = 1mA,
COUT= 10µF
f=1kHz 45 dB
TJ=-40°C to 125°C f=100kHz 62
IQQuiescent current
IOUT=0mA to 85mA, TJ=-40°C to 125°C 5.5
µA
IOUT=0mA to 85mA, VIN=24V
TJ=-40°C to 125°C 6.5
ISC Short circuit current VOUT=0, TJ=-40°C to 125°C VIN=3.8V 120 mA
TON Turn on time (3) VIN =4.2V, COUT= 10µF, IOUT=60mA,
TJ=-40°C to 125°C 0.7 ms
COUT Output capacitor Capacitance f = 100kHz 0.47 µF
1. For VOUT(NOM) < 2 V, VIN = 2.5 V.
2. Guaranteed by design.
3. Turn-on time is time measured between the input just exceeding 90% of its final value and the output voltage just reaching
95 % of its nominal value.
ST715XX, ST715XX25, ST715XX33 Electrical characteristics
Doc ID 14414 Rev 7 7/19
TJ = 25 °C, VIN = VOUT(NOM) + 1 V, CIN = 0.1 µF, COUT = 1 µF, IOUT = 1 mA, VOUT = 3.3 V
unless otherwise specified. (1)
Table 7. Electrical characteristics - fixed version
Symbol Parameter Test conditions Min. Typ. Max. Unit
VIN Operating input voltage IOUT = 85mA, TJ=-40°C to 125°C
VOUT
+VDRO
PTYP
24 V
IOUT Output current VIN=4.3 to 24V, TJ=-40°C to 125°C 0 85 mA
VOUT VOUT total accuracy (1) VIN=VOUT+1 to 24V, IOUT=0 to 85mA,
TJ=-40°C to 125°C -5 +5 %
ΔVOUT Line regulation VIN=4.3 to 24V, IOUT=1mA,
TJ=-40°C to 125°C 0.001 0.004 %/V
ΔVOUT Load regulation IOUT =100µA to 85mA,
TJ=-40°C to 125°C 0.002 0.003 %/mA
VDROP Drop output voltage (2) IOUT=85mA, TJ=-40°C to 125°C 500 1000 mV
eNOutput noise voltage (3) 200Hz to 100kHz, IOUT = 50mA,
COUT= 10µF, TJ=-40°C to 125°C 210 µVRMS
SVR Supply voltage rejection
VIN=VOUTNOM+1V+/-VRIPPLE,
VRIPPLE=0.2V, IOUT=1mA,
COUT= 10µF
f=1kHz 38 dB
TJ=-40°C to 125°C f=100kHz 57
IQQuiescent current IOUT=0mA to 85mA,
TJ=-40°C to 125°C
3.75 5.5 µA
VIN=24V 4.15 6.5
ISC Short circuit current VOUT=0, TJ=-40°C to 125°C VIN=3.8V 120 mA
TON Turn on time (4) VIN =4.2V, COUT= 10µF, IOUT=60mA,
TJ=-40°C to 125°C 0.7 ms
COUT Output capacitor Capacitance f = 100kHz 0.47 µF
1. For VOUT(NOM) < 2 V, VIN = 2.5 V.
2. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This
specification does not apply for output voltages below 2 V.
3. Guaranteed by design.
4. Turn-on time is time measured between the input just exceeding 90 % of its final value and the output voltage just reaching
95% of its nominal value.
Output voltage selection for adjustable version ST715XX, ST715XX25, ST715XX33
8/19 Doc ID 14414 Rev 7
5 Output voltage selection for adjustable version
The ST715xx features an adjustable output voltage using two external resistors connected
as a voltage divider to the FB pin as shown in the typical application circuit Figure 4. The
output voltage is set using the following equation:
Equation 1
VOUT = VFB (1 + R1/R2)
where typically VFB = 1.2 V. Choose R2 ≥ 5 kΩ in order to optimize quiescent current,
accuracy, and high-frequency power-supply rejection. To simplify resistor selection use the
following equation:
Equation 2
R1 = R2 x (VOUT/VFB - 1)
5.1 External capacitor requirements
A 0.1 µF or larger input bypass capacitor, connected between IN and GND and located
close to the device, is recommended to improve transient response and noise rejection of
the power supply as a whole. A higher-value input capacitor may be necessary if large, fast-
rise-time load transients will be present in the application and if the device is located several
inches away from the power source.
The ST715xx requires an output capacitor connected between OUT and GND to stabilize
the internal control loop. Any capacitor (including ceramic and tantalum) with a value higher
than 0.47 µF will properly stabilize this loop.
5.2 Power dissipation and junction temperature
To ensure reliable operation, worst-case junction temperature should not exceed 125 °C.
This restriction limits the power dissipation the regulator can handle in any given application.
To ensure that the junction temperature is within acceptable limits, calculate the maximum
allowable dissipation, PD(max), and the actual dissipation, PD, which must be less than or
equal to PD(max).
The maximum power dissipation limit is determined using the following equation:
Equation 3
PD(max) = (TJMAX - TA) / RthJA
where:
TJMAX is the maximum allowable junction temperature.
RthJA is the thermal resistance junction-to-ambient for the package.
TA is the ambient temperature.
ST715XX, ST715XX25, ST715XX33 Output voltage selection for adjustable version
Doc ID 14414 Rev 7 9/19
The regulator dissipation is calculated using the following equation:
Equation 4
PD = (VIN - VOUT) x IOUT
Power dissipation resulting from quiescent current is negligible.
The ST715xx features internal current limiting. During normal operation, it limits output
current to approximately 350 mA. When current limiting engages, the output voltage scales
back linearly until the overcurrent condition ends. Take care not to exceed the power
dissipation ratings of the package.
Typical application ST715XX, ST715XX25, ST715XX33
10/19 Doc ID 14414 Rev 7
6 Typical application
Figure 3. Application circuit for fixed version
Figure 4. Application circuit for adjustable version
ST715XX, ST715XX25, ST715XX33 Typical performance characteristics
Doc ID 14414 Rev 7 11/19
7 Typical performance characteristics
Figure 5. Output voltage vs. temperature Figure 6. Output voltage vs. input voltage
Figure 7. Dropout voltage vs. output current Figure 8. COUT stability region
Figure 9. Supply voltage rejection vs.
frequency
Figure 10. Output noise voltage vs. frequency
V
IN
=V
OUT(NOM)
+1V
3.15
3.2
3.25
3.3
3.35
3.4
3.45
3.5
-50 0 50 100 150
Temp [°C]
V
OUT
[V]
I
OUT
=1mA
I
OUT
=85mA
V
IN
=V
OUT(NOM)
+1V
3.15
3.2
3.25
3.3
3.35
3.4
3.45
3.5
-50 0 50 100 150
Temp [°C]
V
OUT
[V]
I
OUT
=1mA
I
OUT
=85mA
V
IN
=V
OUT(NOM)
+1V
0
0.5
1
1.5
2
2.5
3
3.5
0123456
V
IN
[V]
V
OUT
[V]
V
IN
=V
OUT(NOM)
+1V
0
0.5
1
1.5
2
2.5
3
3.5
0123456
V
IN
[V]
V
OUT
[V]
0
200
400
600
800
1000
0 20 40 60 80 100
I
OUT
[A]
V
DROPOUT
[V]
0
200
400
600
800
1000
0 20 40 60 80 100
I
OUT
[A]
V
DROPOUT
[V]
CIN=0.1µF, VIN=VEN=2.5 to 24V
IOUT=1mA to 0.085A
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
0.47 1 4.7 10
COUT [µF] (nominal value)
ESR @ 100 kHz [Ohm]
STABILITY REGION
CIN=0.1µF, VIN=VEN=2.5 to 24V
IOUT=1mA to 0.085A
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
0.47 1 4.7 10
COUT [µF] (nominal value)
ESR @ 100 kHz [Ohm]
STABILITY REGION
I
OUT
=1mA, V
RIPPLE
=0.2V
PP
, V
OUT
=1.2V
30
35
40
45
50
55
60
100 1000 10000 100000
Freq [Hz]
SVR [dB]
I
OUT
=1mA, V
RIPPLE
=0.2V
PP
, V
OUT
=1.2V
30
35
40
45
50
55
60
100 1000 10000 100000
Freq [Hz]
SVR [dB]
I
OUT
=50mA, V
IN
=2.5V, V
OUT
=1.2V
0
100
200
300
400
500
600
700
1000 10000 100000
Freq [Hz]
nV/
Hz]
I
OUT
=50mA, V
IN
=2.5V, V
OUT
=1.2V
0
100
200
300
400
500
600
700
1000 10000 100000
Freq [Hz]
nV/
Hz]
Typical performance characteristics ST715XX, ST715XX25, ST715XX33
12/19 Doc ID 14414 Rev 7
Figure 11. Quiescent current vs. input voltage Figure 12. Load transient
CIN=COUT=1µF, VEN =VIN=24V IOUT=from 1mA to 85mA
tR=tF=5µS
Figure 13. Line transient Figure 14. Enable transient
COUT=1µF; VIN=VEN=from 4.3 to 22V; IOUT=1mA; tR=tF=5µs
CIN= COUT=1µF, VEN=VIN=0 to 4.3V, IOUT=1mA
V
IN
=V
INH
, I
OUT
=1mA, V
OUT
=3.3V
0
1
2
3
4
5
0 5 10 15 20 25
V
IN
[V]
Iq [µA]
V
IN
=V
INH
, I
OUT
=1mA, V
OUT
=3.3V
0
1
2
3
4
5
0 5 10 15 20 25
V
IN
[V]
Iq [µA]
ST715XX, ST715XX25, ST715XX33 Package mechanical data
Doc ID 14414 Rev 7 13/19
8 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Package mechanical data ST715XX, ST715XX25, ST715XX33
14/19 Doc ID 14414 Rev 7
Dim.
mm. mils.
Min. Typ. Max. Min. Typ. Max.
A0.90 1.45 35.4 57.1
A1 0.00 0.10 0.0 3.9
A2 0.90 1.3035.4 51.2
b0.35 0.50 13.7 19.7
C0.090.20 3.5 7.8
D2.803.00 110.2 118.1
E 1.50 1.75 59.0 68.8
e0.9537.4
H 2.60 3.00 102.3118.1
L 0.10 0.60 3.923.6
SOT23-5L mechanical data
7049676D
ST715XX, ST715XX25, ST715XX33 Package mechanical data
Doc ID 14414 Rev 7 15/19
Dim.
mm. mils.
Min. Typ. Max. Min. Typ. Max.
A0.800.90 1.00 31.5 35.4 39.4
A1 0.02 0.05 0.82.0
A30.20 7.9
b0.25 0.300.359.811.813.8
D2.853.00 3.15 112.2 118.1 124
D2 1.6031.7531.85363.1 6973
E2.853.00 3.15 112.2 118.1 124
E2 1.345 1.495 1.5955358.962.8
e 0.65 25.6
L0.30 0.40 0.50 11.815.7 19.7
DFN8 (3x3 mm) mechanical data
Package mechanical data ST715XX, ST715XX25, ST715XX33
16/19 Doc ID 14414 Rev 7
Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A180 7.086
C 12.813.0 13.2 0.504 0.512 0.519
D 20.2 0.795
N60 2.362
T 14.4 0.567
Ao 3.133.233.33 0.1230.127 0.131
Bo 3.07 3.17 3.27 0.120 0.124 0.128
Ko 1.27 1.37 1.47 0.050 0.054 0.0.58
Po 3.94.0 4.1 0.1530.157 0.161
P3.94.0 4.1 0.1530.157 0.161
Tape & reel SOT23-xL mechanical data
ST715XX, ST715XX25, ST715XX33 Package mechanical data
Doc ID 14414 Rev 7 17/19
Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A180 7.087
C 12.813.2 0.504 0.519
D 20.2 0.795
N60 2.362
T 14.4 0.567
Ao 3.30.130
Bo 3.30.130
Ko 1.1 0.043
Po 4 0.157
P80.315
Tape & reel QFNxx/DFNxx (3x3) mechanical data
Revision history ST715XX, ST715XX25, ST715XX33
18/19 Doc ID 14414 Rev 7
9 Revision history
Table 8. Document revision history
Date Revision Changes
08-Feb-2008 1 Initial release.
19-Feb-2008 2 Modified: Features on page 1.
22-Sep-2008 3 Modified: DFN8 (3x3 mm) mechanical data on page 15.
26-Nov-2008 4 Modified: Section 5 on page 8.
24-Mar-2010 5 Modified: Table 4 on page 5.
20-May-2010 6 Modified: IQ max values Table 6 on page 6 and Table 7 on page 7.
24-Jun-2010 7 Modified: Tab le 2 and Table 3 on page 4.
ST715XX, ST715XX25, ST715XX33
Doc ID 14414 Rev 7 19/19
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