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ST715PU25R
High input voltage
October 2014 DocID14414 Rev 11 1/24
ST715High input voltage, 85 mA LDO linear regulator
Datasheet - production data
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 voltages available on request: from
1.2 V to 5.0 V with 100 mV step and adjustable Compatible with ceramic output capacitors
from 0.47 µF to 10 µF Internal current limit Packages: SOT23-5L, SOT323-5L and DFN8
(3x3 mm) Temperature range: from -40 °C to 125 °C
Applications Mobile phones Personal digital assistant (PDAs) Cordless phones and similar battery-powered
systems
DescriptionThe ST715 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 2.5 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 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 ST715 an ideal solution for low
power industrial applications. The ST715 is
available in SOT23-5, SOT323-5L or DFN8 (3x3
mm) 8 leads.
Table 1. Device summary
Contents ST7152/24 DocID14414 Rev 11
Contents Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Output voltage selection for adjustable version . . . . . . . . . . . . . . . . . . 85.1 External capacitor requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.2 Power dissipation and junction temperature . . . . . . . . . . . . . . . . . . . . . . . 8
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
ST715 Diagram
1 Diagram
Figure 1. Block diagram (fixed version)
Pin configuration ST715 DocID14414 Rev 11
2 Pin configuration
Figure 3. Pin connection (top view)
Table 2. Pin description (DFN8 3x3 mm)
Table 3. Pin description (SOT23-5L/SOT323-5L)
DocID14414 Rev 11 5/24
ST715 Maximum ratings
3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Table 4. Absolute maximum ratings PD is based on an operating temperature of 25 °C or less. It must be derated according to the operating temperature.
Table 5. Thermal data
Electrical characteristics ST715
6/24 DocID14414 Rev 11
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 For VOUT(NOM) < 2 V, VIN = 2.5 V. Guaranteed by design. 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.
DocID14414 Rev 11 7/24
ST715 Electrical characteristics
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 For VOUT(NOM) < 2 V, VIN = 2.5 V. 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 to output voltages below 2 V. Guaranteed by design. 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 ST715
8/24 DocID14414 Rev 11 Output voltage selection for adjustable version
The ST715 features an adjustable output voltage due to two external resistors connected as
a voltage divider to the FB pin as shown in Figure 4. The output voltage is set by the
following equation:
Equation 1
VOUT = VFB (1 + R1/R2)
where typically VFB = 1.2 V. Choose R2 ≥ 5 kΩ to optimize the quiescent current, accuracy,
and high-frequency power supply rejection. The resistor selection is given by the following
equation:
Equation 2
R1 = R2 x (VOUT/VFB - 1)
5.1 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 ST715 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 , stabilizes this loop.
5.2 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 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
The regulator dissipation is calculated by the following equation:
DocID14414 Rev 11 9/24
ST715 Output voltage selection for adjustable version
Equation 4
PD = (VIN - VOUT) x IOUT
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.
Typical application ST715
10/24 DocID14414 Rev 11
6 Typical application
Figure 4. Application circuit for fixed version
Figure 5. Application circuit for adjustable version
ST715 Typical performance characteristics Typical performance characteristics
Typical performance characteristics ST715
12/24 DocID14414 Rev 11
