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TLE4261-2-TLE4261-2G
5 V Low-Drop Voltage Regulator
( Infineon
technologies
5-V Low-Drop Voltage Regulator
Features
TLE 4261 -2
High accuracy 5 V i 2%
Very low-drop voltage
Very low quiescent current
Low starting-current consumption
Proof against reverse polarity
Input voltage up to 42 V
Overvoltage protection up to 65 V (f 400 ms)
Short-circuit-proof
External setting of reset delay
Integrated watchdog circuit
Wide temperature range
Overtemperature protection
Suitable for automotive use
EMC proofed (100 V/m)
(sCCC.is cp,
f, ‘m‘\‘ ,
P-DSO-20-1 /-6 /-7
Ordering Code
Package
TLE 4261-2 G
Q67000-A9140
P-DSO-20-6 (SMD)
V Not recommended for new design. Please refer to the pin compatible device TLE 4271-2.
FunctionalDescription
TLE 4261-2 is a high accuracy 5-V Iow-drop voltage regulator in a P-DSO package. The
maximum input voltage is 42 V (65 V/s: 400 ms). The device can produce an output
current of more than 500 mA. It is short-circuit-proof and incorporates temperature
protection that disables the circuit at impermissibly high temperatures.
Data Sheet Rev. 2
Infineon TLE 4261-2
technologies
Application Description
The IC regulates an input voltage VI in the range 6 V < V, < 40 V to VGrated = 5.0 V. A
reset signal is generated for an output voltage VO of < 4.75 V. The reset delay can be
set with an external capacitor. A connected microprocessor is monitored by the
integrated watchdog circuit; if pulses are missing, the reset output is set low. The pulse
repetition rate can be set within wide limits with the capacitor for reset delay. If this input
is connected to a voltage of > 6 V, the watchdog function is deactivated. The device also
features an inhibit input, which is activated by a voltage of > 6 V and then works on this
input through internal hysteresis up to approx. 3 V. A voltage of < 2 V on the inhibit input
turns off the regulator, current drain then dropping to max. 50 uA.
Design Notes for External Components
The input capacitor C, causes a Iow-resistant powerline and limits the rise times of the
input voltage. The IC is protected against rise times up to 100 V/ps. It is possible to damp
the tuned circuit consisting of supply inductance and input capacitance with a resistor of
approx. 1 Q in series to CI.
The output capacitor maintains the stability of the regulating loop. Stability is guaranteed
with a rating of 22 " min. at an ESR of 3 £2 max. in the operating temperature range.
Circuit Description
The control amplifier compares a reference voltage, which is kept highly accurate by
resistance adjustment, to a voltage that is proportional to the output voltage and controls
the base of the series PNP transistor via a buffer. Saturation control as a function of the
load current prevents any over-saturation of the power element. If the output voltage
drops below 95.5% of its typical value for more than 2 us, a reset signal is triggered on
pin 3 and an external capacitor discharged on pin 5. The reset signal is not cancelled
until the voltage on the capacitor has exceeded the upper switching threshold VDT. A
positive-edge-triggered watchdog circuit monitors the connected microprocessor and
will likewise trigger a reset if pulses are missing. The IC can be disabled by a low level
on the inhibit input and the current consumption drops to < 50 MA.
The IC also incorporates a number of circuits for protection against:
. Overload
. Overvoltage
. Overtemperature
. Reverse polarity
Data Sheet Rev. 2 2 2000-02-01
