LDK715
High input voltage 85 mA LDO linear regulator
Datasheet - production data
Applications
• Mobile phones
• Industrial
• battery-powered systems
627/
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Description
Features
• 4.3 V to 24 V input voltage
• Low-dropout voltage (500 mV typ. at 85 mA)
• Very low quiescent current (5 µA typ. at full
load)
• 85 mA guaranteed output current
• Output voltages 3.3 V, 4.2 V and 5.0 V (other
versions available on request)
The LDK715 is a high voltage, ultra low quiescent
current and low drop linear regulator capable of
providing an output current in excess of 85 mA.
The device operates over an input voltage range
from 4.3 V to 24 V, and it is stable with output
ceramic capacitors. Fault condition protection
includes short-circuit current limitation. The ultra
low quiescent current of 5 µA at full load makes it
highly suitable for low power applications and
battery-powered systems. The wide input voltage
range makes the LDK715 an ideal solution for low
power industrial applications. The LDK715 is
available in SOT23-5, or DFN8 3x3 - 8 leads.
• Compatible with ceramic output capacitors
from 0.47 µF to 10 µF
• Internal current limit
• Packages: SOT23-5L and DFN8 3x3
• Temperature range: from -40 °C to 125 °C
Table 1. Device summary
Order codes
Output voltage
SOT23-5L
DFN8 3x3
LDK715M33R
LDK715PU33R
3.3 V
LDK715M42R
LDK715PU42R
4.2 V
LDK715M50R
LDK715PU50R
5.0 V
April 2020
This is information on a product in full production.
DocID026678 Rev 3
1/19
www.st.com
Contents
LDK715
Contents
1
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1
External capacitor requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2
Power dissipation and junction temperature . . . . . . . . . . . . . . . . . . . . . . . 7
5
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8
9
2/19
7.1
SOT23-5L package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
7.2
DFN8 3x3 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Packaging information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8.1
Tape and reel SOT23-5L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8.2
Tape and reel DFN8 3x3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
DocID026678 Rev 3
LDK715
1
Diagram
Diagram
Figure 1. Block diagram
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DocID026678 Rev 3
3/19
19
Pin configuration
2
LDK715
Pin configuration
Figure 2. Pin connection (top view)
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Table 2. Pin description for DFN8 3x3
Symbol
Pin number
Name and function
IN
1
Input voltage
NC
2, 3, 5, 6, 7
Not internally connected
GND
4
Common ground
OUT
8
Output voltage
Exp. pad
Leave floating or connect to GND
Table 3. Pin description for SOT23-5L
4/19
Symbol
Pin number
Name and function
IN
4
Input voltage
NC
1.3
Not internally connected
GND
2
Common ground
OUT
5
Output voltage
DocID026678 Rev 3
LDK715
3
Maximum ratings
Maximum ratings
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
IOUT
Continuous output current
According to package
power dissipation
A
Maximum power dissipation, DFN package
2
Maximum power dissipation, SOT23-5L package
0.45
TSTG
Storage temperature range
-65 to 150
°C
TOP
Operating junction temperature range
-40 to 125
°C
PD(1), (2)
W
1. PD is based on an operating temperature of 25 °C or less. It must be derated according to the operating temperature.
2. The LDK715 has an internal constant current limit feature. Take care not to exceed the power dissipation ratings of the
package also during current limit and short-circuit events.
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Table 5. Thermal data
Symbol
Parameter
SOT23-5L
DFN8
Unit
RthJA
Thermal resistance junction ambient
195
52
°C/W
DocID026678 Rev 3
5/19
19
Electrical characteristics
4
LDK715
Electrical characteristics
TJ = 25 °C, VIN = VOUT(NOM) + 1 V, CIN = 0.1 µF, COUT = 1 µF, IOUT = 1 mA, unless
otherwise specified(a).
Table 6. Electrical characteristics
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
4.3
-
24
V
VIN = VOUT(NOM)+1 to 24 V, TJ = -40 °C to 125 °C
0
-
85
mA
TJ = 25 °C
-1
-
+1
VIN = VOUT(NOM)+1 to 24 V, TJ = - 40 °C to 125 °C
-2
-
+2
VIN
Operating input voltage IOUT = 85 mA, TJ = -40 °C to 125 °C
IOUT
Output current
VOUT
VOUT accuracy(1)
ΔVOUT
Line regulation
VIN = VOUT(NOM) +1 to 24 V to 24 V,
IOUT = 1 mA, TJ = -40 °C to 125 °C
-
0.001 0.004
ΔVOUT
Load regulation
IOUT = 100 µA to 85 mA,
TJ = -40 °C to 125 °C
-
0.002 0.003 %/mA
VDROP
Drop output voltage(2)
IOUT = 85 mA, TJ = -40 °C to 125 °C
-
500
1000
mV
eN
Output noise voltage(3)
200 Hz to 100 kHz, IOUT = 50 mA,
COUT = 10 µF, TJ =-40 °C to 125 °C
-
-
210
µVRMS
-
SVR
Supply voltage
rejection
%
%/V
VIN = VOUT(NOM) +1 V +/- VRIPPLE,
VRIPPLE = 0.2 V,
IOUT = 1 mA, COUT = 10 µF
f = 1 kHz
-
38
TJ = -40 °C to 125 °C
f = 100 kHz
-
57
-
5
7
-
-
8.5
120
-
-
mA
-
0.7
-
ms
0.47
-
-
µF
IQ
Quiescent current
IOUT = 0 mA to 85 mA,
TJ = -40 °C to 125 °C
ISC
Short-circuit current
VOUT = 0, TJ = -40 °C to 125 °C
VIN = VOUT(NOM) +1 to 24 V
TON
Turn on time (4)
VIN = VOUT(NOM) +1 to 24 V, COUT = 10 µF,
IOUT = 60 mA, TJ = -40 °C to 125 °C
COUT
Output capacitor
Capacitance f = 100 kHz
VIN = 24 V
dB
µA
1. For VOUT(NOM) < 3.3 V, VIN = 4.3 V.
2. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value.
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.
a. For VOUT(NOM) < 3.3 V, VIN = 4.3 V.
6/19
DocID026678 Rev 3
LDK715
4.1
Electrical characteristics
External capacitor requirements
A 0.1 µF or a larger input bypass capacitor, connected between IN and GND and located
close to the device, is recommended. In this manner, the transient response and noise
rejection of the power supply, as a whole, improve. A higher value of the input capacitor may
be necessary if large, fast-rise-time load transients are present in the application and if the
device is several inches far from the power source.
The LDK715 requires an output capacitor connected between OUT and GND to stabilize the
internal control loop. Please refer to Figure 7. for the allowable output capacitance and ESR
combinations.
4.2
Power dissipation and junction temperature
For a reliable operation, junction temperature should not exceed 125 °C. This limits the
power dissipation the regulator can handle in any application. To guarantee that the junction
temperature is within acceptable limits, calculate the maximum allowable dissipation,
PD(max), and the dissipation, PD, which must be less than or equal to PD(max).
The maximum power dissipation limit is given by the following equation:
Equation 1
P D ( max ) = ( T JMAX – T A ) ⁄ R thJA
where:
TJMAX is the maximum allowable junction temperature
RthJA is the thermal resistance junction to ambient for the package
TA is the ambient temperature
The regulator dissipation is calculated by the following equation:
Equation 2
P D = ( V IN – V out ) × I out
Power dissipation coming from quiescent current is negligible.
The ST715 features the internal current limit. During normal operation, it limits the output
current to approximately 350 mA. When the current limit engages, the output voltage scales
back linearly until the overcurrent condition ends. Do not exceed the power dissipation
ratings of the package.
DocID026678 Rev 3
7/19
19
Typical application
5
LDK715
Typical application
Figure 3. Application circuit
8/19
DocID026678 Rev 3
LDK715
Typical performance characteristics
6
Typical performance characteristics
Figure 4. Output voltage vs. temperature
Figure 5. Output voltage vs. input voltage
3.5
3.5
IOUT=1mA
3.45
2.5
VOUT [V]
3.4
VOUT [V]
3
IOUT=85mA
3.35
3.3
2
1.5
1
3.25
0.5
3.2
VIN=VOUT(NOM)+1V
3.15
-50
0
50
100
VIN=VOUT(NOM)+1V
0
0
150
1
2
Temp [°C]
4
5
6
VIN [V]
Figure 6. Dropout voltage vs. output current
Figure 7. COUT stability region
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