Datasheet

2003 Nov 28 12
Philips Semiconductors Product specification
Multiple voltage regulators with switch TDA3608Q; TDA3608TH
Notes
1. The minimum value is the minimum operating voltage, only if V
P
has exceeded 6.5 V.
2. The quiescent current is measured in the standby mode. Therefore, the enable inputs of regulator 1, regulator 3 and
the power switch are grounded and R
L(REG2)
= ∞.
3. The voltage of the regulator drops as a result of a V
P
drop.
4. The rise and fall time is measured with a 10 kΩ pull-up resistor and C
L
=50pF.
5. This is the threshold voltage for the delay time of the power switch. The voltage on the reset delay capacitor increases
only at low output voltage of the power switch (for example at short circuit). When the voltage on this capacitor
exceeds this threshold voltage, the power switch is set to the foldback mode. The power switch is also protected by
the temperature protection.
6. Delay time calculation:
a) Reset pulse delay: The delay time is 47 ms for C = 47 nF.
b) Power switch delay: The delay time is 23.5 ms for C = 47 nF.
7. The dropout voltage of regulator 1, regulator 2 and regulator 3 is measured between pin V
P
and pins REG1, REG2
or REG3 respectively.
8. During current limit, current I
m
is held constant.
9. The foldback current protection limits the dissipated power at short-circuit.
I
q
quiescent current I
REG3
= 400 mA − 15 40 mA
SVRR supply voltage ripple
rejection
f
i
= 3 kHz; V
i
= 2 V (p-p) 60 70 − dB
V
drop
dropout voltage V
P
= 5.75 V; I
REG3
= 400 mA;
note 7
− 1 1.5 V
I
m
current limit V
REG3
> 4.5 V; see Fig.10;
note 8
0.45 0.70 − A
I
sc
short-circuit current R
L
≤ 0.5 Ω; see Fig.10; note 9 100 400 − mA
Power switch
V
drop
dropout voltage I
SW
= 1 A; note 12 − 0.45 0.7 V
I
SW
= 1.8 A; note 12 − 1.0 1.8 V
V
cl
clamping voltage V
P
≥ 18 V 15 16.2 17.2 V
V
fb
flyback voltage
behaviour
I
SW
= −100 mA − V
P
+ 3 22 V
I
dc
continuous current V
P
=16V; V
SW
= 13.5 V 1.8 2.0 − A
I
M
peak current V
P
= 17 V; see Fig.11; note 13 2 −−A
I
sc
short-circuit current V
P
= 14.4 V; V
SW
< 3.5 V;
see Fig.11; note 14
− 0.5 − A
Backup switch
I
dc
continuous current 0.3 0.35 − A
V
cl
clamping voltage V
P
≥ 16.7 V −− 16 V
I
r
reverse current V
P
= 0; V
BU
= 12.4 V; note 15 −− 900 mA
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
t
d(res)
C
I
ch
------
V
C(th1)
× C 1000 10
3
××== [sec]
t
d(sw)
C
I
ch
------
V
C(th2)
× C 500× 10
3
× [sec]==