TLE4470 Siemens Semiconductor Group, TLE4470 Datasheet - Page 2

• Manufacturer Part Number: TLE4470
• Description: Dual Low-Drop Voltage Regulator
• Manufacturer: Siemens Semiconductor Group

TLE 4470 G type (P-DSO-20-6 package).
which is proportional to the output voltage
series PNP transistor via a buffer.
The main output voltage
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 A typical.
Two additional features of the TLE 4470 are an early warning comparator (can be used
e.g. to monitor the supply voltage
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
external delay capacitor sets the delay time. The under voltage reset circuit supervises
the stand-by output voltage. In case
reset output is set LOW after a short reaction time. The reset LOW signal is generated
down to an output voltage
Pin Configuration
(top view)
Figure 1
Semiconductor Group
GND
GND
GND
DIS
RQ
SQ
D
P-DSO-14-4
1
2
3
4
5
6
7
14
13
12
10
V
11
9
8
Q2
V
AEP02152
Q1
is tracked to the accuracy of the stand by output.
V
Q1
SI
GND
GND
GND
Q2
Q1
of 1 V.
of the regulator has surpassed the reset threshold. An
V
I
) and reset generator with an adjustable reset delay
V
Q1
falls below the reset switching threshold the
V
2
V
Q2
Q1
. A control amplifier drives the base of the
RADJ
GND
GND
GND
GND
is compared to the voltage at pin VA,
DIS
RQ
SQ
Q1
D
1
2
3
4
5
6
7
8
9
10
P-DSO-20-6
20
19
18
17
16
15
14
13
12
11
AEP02151
SI
GND
GND
GND
GND
Q2
Q2
ADJ2
1
2
TLE 4470
1998-11-01