tda3681a NXP Semiconductors, tda3681a Datasheet - Page 7

• Manufacturer Part Number: tda3681a
• Description: Tda3681a Multiple Voltage Regulator With Switch And Ignition Buffer
• Manufacturer: NXP Semiconductors

Philips Semiconductors
During an overload condition or a short circuit
(V
capacitor rises 0.6 V above the voltage of regulator 2. This
rise time depends on the capacitor connected to
pin C
more than 3 A. When regulator 2 is out of regulation and
generates a reset, the power switch can only deliver 2 A
and will immediately go into foldback protection.
At supply voltages > 17 V, the power switch is clamped at
16 V maximum (to avoid externally connected circuits
being damaged by an overvoltage) and the power switch
will switch off at load dump.
2003 Aug 29
handbook, full pagewidth
SW
Multiple voltage regulator with
switch and ignition buffer
CRES
< V
regulator 1/3
V P1 = V P2
regulator 1
regulator 3
regulator 4
regulator 4
P
enable
enable
enable
power
switch
power
switch
output
. During this time, the power switch can deliver
V P
3.7 V), the voltage on the reset delay
16.9 V
8.9 V
7.0 V
4.0 V
1.8 V
1.3 V
8.5 V
1.8 V
1.3 V
7.0 V
4.0 V
1.8 V
1.3 V
5.0 V
3.3 V
18 V
16 V
0 V
0 V
0 V
0 V
Fig.4 Timing diagram of regulators and power switch.
load dump
V P and enable Schmitt trigger
load dump
Power switch behaviour
7
Interfacing with the microcontroller (simple full or semi
on/off logic applications) can be realized with an
independent ignition Schmitt trigger and ignition output
buffer (push-pull output).
The timing diagrams are illustrated in Figs 4 and 5.
The second supply voltage V
regulators 3 and 4. This input can be connected to a lower
supply voltage of
the TDA3681A. A DC-to-DC converter could be used for
this purpose.
6 V to reduce the power dissipation of
P2
is used for the switchable
Product specification
TDA3681A
MGL906