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S-19244XXXA Datasheet(Fiches technique) 24 Page - ABLIC Inc.

Numéro de pièce S-19244XXXA
Description  AUTOMOTIVE, 125°C OPERATION, 10 V INPUT, 1000 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION
Télécharger  68 Pages
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Fabricant  ABLIC [ABLIC Inc.]
Site Internet  https://www.ablic.com
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 24 page
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AUTOMOTIVE, 125°C OPERATION, 10 V INPUT, 1000 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION
S-19244xxxA Series
Rev.3.2_00
24
Condition of Application
Input capacitor (CIN):
A ceramic capacitor with capacitance of 2.2
μF or more is recommended.
Output capacitor (CL):
A ceramic capacitor with capacitance of 2.2
μF or more is recommended.
Caution Generally, in a voltage regulator, an oscillation may occur depending on the selection of the external
parts. Perform thorough evaluation including the temperature characteristics with an actual
application using the above capacitors to confirm no oscillation occurs.
Selection of Input Capacitor (CIN) and Output Capacitor (CL)
The S-19244xxxA Series requires CL between the VOUT pin and the VSS pin for phase compensation. The operation
is stabilized by a ceramic capacitor with capacitance of 2.2
μF or more. When using an OS capacitor, a tantalum
capacitor or an aluminum electrolytic capacitor, the capacitance also must be 2.2
μF or more. However, an oscillation
may occur depending on the equivalent series resistance (ESR).
Moreover, the S-19244xxxA Series requires CIN between the VIN pin and the VSS pin for a stable operation.
Generally, an oscillaiton may occur when a voltage regulator is used under the conditon that the impedance of the
power supply is high.
Note that the output voltage transient characteristics varies depending on the capacitance of CIN and CL and the value
of ESR.
Caution Perform thorough evaluation including the temperature characteristics with an actual application to
select CIN and CL.
Selection of Capacitor for Soft-start (CSS)
The S-19244xxxA Series E / F / G / H type requires the capacitor for soft-start (CSS) between the SSC pin and the
VSS pin. Over the entire temperature range, the S-19244xxxA Series operates stably with a ceramic capacitor of 0.68
nF or more. According to CSS capacitance, the rising speed of the output voltage is adjustable. The time that the
output voltage rises to 99% is 6.0 ms typ. at CSS = 10 nF. The recommended value for applications is 0.68 nF
≤ CSS
168 nF, however; define the values by sufficient evaluation including the temperature characteristics under the usage
condition.
Selection of Resistor for Output Voltage External Setting (Ra, Rb)
The S-19244xxxA Series provides the types in which output voltage can be set via the external resistor. The output
voltage can be set by connecting a resistor (Ra) between the VOUT pin and the VADJ pin, and a resistor (Rb) between
the VADJ pin and the VSS pin.
Depending on the intended output voltage, select Ra and Rb from the range shown in Table 25.
Caution Since the VADJ pin impedance is comparatively high and is easily affected by noise, pay adequate
attention to the wiring pattern.
Table 25
VOUT
Ra
Rb
1.0 V
Connect to VOUT pin
Unnecessary
1.05 V to 9.0 V
0.1 k
Ω to 1.2 MΩ
2 k
Ω to 200 kΩ




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