TLE4287G_09 Datasheet, PDF (1/13 Pages) Infineon Technologies AG – 5-V Voltage Regulator Input voltage up to 42 V

5-V Voltage Regulator
TLE 4287 G
Features
• Output voltage tolerance ≤ ±2%
• Very low standby current consumption
• Input voltage up to 42 V
• Reset function down to 1 V output voltage
• Adjustable reset time
• On/Off logic
• Overtemperature protection
• Reverse polarity protection
• Short-circuit proof
• Very wide temperature range
• Very small output capacitor
• Green Product (RoHS compliant)
• AEC Qualified
Functional Description
The TLE 4287 G is a monolithic integrated 5 V voltage regulator in PG-DSO-14
package. It supplies an output current I_Q > 250 mA. The IC is short circuit proof and
incorporates temperature protection which turns off the device at overtemperature.
The input voltage V_I is regulated in the range of 7.5 V < V_I < 40 V to V_Q,nom = 5 V.
Therefore a reference voltage, which is kept highly accurate by resistance adjustment,
is compared via a control amplifier to a voltage that is proportional to the output voltage.
The control amplifier drives the base of the series transistor by a buffer.
A comparator in the reset-generator block compares a reference voltage that is
independent of the input voltage to the scaled-down output voltage. In the case of an
output voltage V_Q < 4.5 V the reset delay capacitor is discharged and a reset signal is
generated by setting the reset output LOW. The reset delay time can be set by choosing
the external capacitor over a wide range. When the output voltage rises above V_Q ≥ 4.5 V
the reset delay capacitor is charged again. As soon as the delay capacitor voltage
reaches the upper switching threshold the reset output pin is set HIGH again.
Type
TLE 4287 G
Data Sheet
Package
PG-DSO-14
1
Rev. 1.4, 2009-01-12