TDA3616T PHILIPS [NXP Semiconductors], TDA3616T Datasheet - Page 12

• Manufacturer Part Number: TDA3616T
• Description: Multiple voltage regulator with battery detection
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
A
In Fig.9 the total quiescent current equals I
The specified quiescent current equals I
supply voltage is connected, the regulator will switch-on
when the supply voltage exceeds 7.5 V. With a timing
capacitor connected to pin V
(the timer starts at the same moment as the regulator is
switched on).
Forced reset can be accomplished by short-circuiting the
timer capacitor by using the push-button switch. When the
push-button is released again, the timer restarts (only
when the regulator is on) causing a second reset on both
RES1 and RES2.
The maximum output current of the regulator equals:
When T
current equals 118 mA. At lower ambient temperature
(T
For successful operation of the IC (maximum output
current capability), special attention has to be paid to the
copper area required as heatsink (connected to
pins 1, 10, 11 and 20), the thermal capacity of the
heatsink and its ability to transfer heat to the external
environment.
2001 Feb 02
I
handbook, full pagewidth
O max
PPLICATION CIRCUIT
amb
Multiple voltage regulator with battery
detection
The pin numbers given in parenthesis refer to the TDA3616SF version.
< 0) the maximum output current equals 250 mA.
amb
=
------------------------------------------------------ -
R
= 85 C and V
th(j-a)
150 T
–
V
P
choke
amb
coil
–
V
P
REG
= 16 V, the maximum output
forced reset
C
the reset can be delayed
2200
=
F
--------------------------------- - [mA]
50
150 T
8 V detector
R1
360 k
R2
100 k
q
on/off
(closed = on)
–
. When the
V
P
q
amb
+ I
–
5
Fig.9 Typical application.
Rdivider
V I(bat)
C d
V C
.
4 (6)
6 (8)
TDA3616T
12
7 (9)
17
(4)
It is possible to reduce the total thermal resistance from
120 K/W to 50 K/W).
Backup circuit
The backup function is used for supplying the regulator
and logic circuits (reset 1 and 2) when the supply voltage
is disconnected. For stability a minimum capacitor value
of 150 nF is needed.
With a supply voltage of 14.4 V the backup capacitor will
be fully charged until approximately 14.2 V. At the moment
the supply voltage is lower than the voltage on pin BU the
backup switch will be opened (this backup switch acts like
an ideal diode) and the charge of the backup capacitor is
used for supplying the regulator and the logic circuits.
The backup capacitor is mainly discharged by the load of
the regulator. After a certain period of time the regulator
output will be disabled and the backup capacitor will only
be discharged by the quiescent current of the IC itself.
In combination with the battery detection Schmitt trigger,
an early warning can be given to the microprocessor to
indicate that the battery voltage has dropped down to an
unacceptable low value, causing the microcontroller to run
on backup charge. The early warning level can be
programmed with resistors R1 and R2; see Fig.9.
V P
(3) 16
(2) 15
(1) 14
(5)
18
(7) 5
BU
REG
RES2
V O(bat)
RES1
MGL931
C BU
1000 F
C L
10 F
used for
8 V detector
(minimum value of 150 nF
needed for stability)
Product specification
TDA3616