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| TLE4470 Datasheet, PDF (2/22 Pages) Siemens Semiconductor Group – Dual Low-Drop Voltage Regulator | |||
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TLE 4470
TLE 4470 G type (P-DSO-20-6 package). VQ1 is compared to the voltage at pin VA,
which is proportional to the output voltage VQ2. A control amplifier drives the base of the
series PNP transistor via a buffer.
The main output voltage VQ2 is tracked to the accuracy of the stand by output.
For the TLE 4470 GS (P-DSO-14-4 package) the output voltage is fixed to 5 V.
To save energy e.g. in battery powered body electronic applications, the main regulator
can be switched off via the disable input, which causes the current consumption to drop
to 180 µA typical.
Two additional features of the TLE 4470 are an early warning comparator (can be used
e.g. to monitor the supply voltage VI) and reset generator with an adjustable reset delay
time. The TLE 4470 G (P-DSO-20-6 package) has in addition an adjustable reset
switching threshold. This feature is useful with microprocessors which guarantee a safe
operation down to voltages below the internally set reset threshold of 4.65 V typical.
Two functions are included in the reset generator, a power on reset and an under-voltage
reset. The power on reset feature is necessary for a defined start of the microprocessor
when switching on the application. The reset LOW signal is generated for a certain delay
time after the output voltage VQ1 of the regulator has surpassed the reset threshold. An
external delay capacitor sets the delay time. The under voltage reset circuit supervises
the stand-by output voltage. In case VQ1 falls below the reset switching threshold the
reset output is set LOW after a short reaction time. The reset LOW signal is generated
down to an output voltage VQ1 of 1 V.
Pin Configuration
(top view)
P-DSO-14-4
D1
DIS 2
GND 3
GND 4
GND 5
RQ 6
SQ 7
14 SI
13 Î
12 GND
11 GND
10 GND
9 Q2
8 Q1
AEP02152
Figure 1
Semiconductor Group
P-DSO-20-6
RADJ 1
D2
DIS 3
GND 4
GND 5
GND 6
GND 7
RQ 8
SQ 9
Q1 10
20 SI
19 Î 1
18 Î 2
17 GND
16 GND
15 GND
14 GND
13 Q2
12 Q2
11 ADJ2
AEP02151
2
1998-11-01
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