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PDF ST1L08 Data sheet ( Hoja de datos )
| Número de pieza | ST1L08 | |
| Descripción | high PSRR voltage regulator | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ST1L08 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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ST1L08
800 mA ultra low drop, high PSRR voltage regulator
Datasheet - production data
Applications
Consumer
Hard disk drives, SSD
Computer
Battery-powered systems
Low voltage point of load
Description
The ST1L08 provides 0.8 A of maximum current
from an input voltage in the range from 1 V to
5.5 V, with a typical dropout voltage as low as
70 mV.
Features
Input voltage from 1 to 5.5 V
Ultra low-dropout voltage (90 mV max. @
800 mA load)
Low ground current (35 μA typ. @ no load)
Output voltage tolerance: ± 2.0% @ 25 °C
High PSRR: 80 dB @ 100 Hz, 50 dB @
1 MHz
800 mA guaranteed output current
Wide range of output voltages available on
request: from 0.5 V to 4 V and adjustable
Logic-controlled electronic shutdown
Internal current and thermal limit
Power Good function
Available in DFN8 2x3 mm package
Temperature range: -40 °C to 125 °C
Input voltage control for the ST1L08Sxx
It is stabilized with a ceramic capacitor on the
output.
The very low drop voltage, low quiescent current
and high PSRR features make it suitable for low
power battery-powered applications.
Enable logic control function puts the ST1L08 in
shutdown mode, reducing the total current
consumption.
Power Good function and input voltage control
feature the ST1L08Sxx version.
The device is equipped with current limit and
thermal protection.
Order code
Table 1: Device summary
Power Good and VIN control
Package
Output voltages
ST1L08SPU12R
Yes
1.2 V
ST1L08SPU33R
Yes
3.3 V
DFN8 (2x3 mm)
ST1L08SPUR
Yes
Adjustable
ST1L08PUR
No
Adjustable
November 2015
DocID026624 Rev 2
This is information on a product in full production.
1/21
www.st.com
1 page  
ST1L08
3 Typical application
Figure 3: Typical application circuits
Typical application
Power Good feature is not present on the ST1L08PUR.
DocID026624 Rev 2
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5 Page 
ST1L08
Application information
6 Application information
6.1
Thermal and short-circuit protections
The ST1L08 is self-protected from short-circuit condition and overtemperature. When the
output load is higher than the one supported by the device, the output current increases
until the limit of typically 1.8 A is reached, at this point the current is kept constant even
when the load impedance is zero.
Thermal protection acts when the junction temperature reaches 165 °C typical. At this point
the output of the IC shuts down. As soon as the junction temperature falls below the
thermal hysteresis value the device starts working again.
In order to calculate the maximum power that the device can dissipate, keeping the junction
temperature below the TOP, the following formula is used:
Equation 1
6.2 Output voltage setting for ADJ version
In the adjustable version, the output voltage can be set from 0.5 V up to 4 V, by connecting
a resistor divider between the ADJ pin and the output, thus allowing remote voltage
sensing.
The resistor divider should be selected using the following equation:
Equation 2
The resistors to be used, should have values in the range from 10 kΩ to 100 kΩ.
Lower values can also be suitable, but they increase current consumption.
6.3 Bias pin voltage requirements
The bias input is designed for low drop applications. The bias pin must be at least 2.7 V,
and at least 1.5 V higher than the output, to ensure proper biasing to the N-channel power
pass transistor.
If VIN supply voltage meets these requirements, the bias pin can be tied to VIN.
6.4 External capacitors requirements
The regulator is designed to be stable with ultra low ESR ceramic capacitors on the input
and the output. The suggested minimum value of the input, bias and output capacitors is
1 μF. The input capacitor must be connected as closer as possible to the VIN terminal. The
output capacitor must also be connected as closer as possible to the output pin.
DocID026624 Rev 2
11/21
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet ST1L08.PDF ] | |
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