Datasheet

9397 750 15049 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 05 — 28 June 2005 4 of 16
Philips Semiconductors
TDA3661
Very low dropout voltage/quiescent current voltage regulator
10. Characteristics
[1] The output voltage can be calculated using the following formula: where and
[2] The regulator output will follow V
P
if V
P
<V
REG
+V
REG(drop)
11. Application information
11.1 Noise
The output noise is determined by the value of the output capacitor. The noise figure is
measured at a bandwidth of 10 Hz to 100 kHz; see Table 7.
Table 6: Characteristics
V
P
= 14.4 V; T
amb
=25 ° C; k = 4.01929
[1]
; measured with test circuit of Figure 15; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
Supply voltage: pin V
P
V
P
supply voltage regulator operating
[2]
3 14.4 45 V
I
q
quiescent supply current V
P
= 4.5 V; I
REG
= 0 mA - 10 30 µA
V
P
= 14.4 V; I
REG
= 0 mA - 15 30 µA
6V≤ V
P
≤ 24 V; I
REG
= 10 mA - 0.2 0.5 mA
6V≤ V
P
≤ 24 V; I
REG
= 50 mA - 1.4 2.5 mA
Regulator output: pin REG
V
REG
output voltage 8 V ≤ V
P
≤ 22 V; I
REG
= 0.5 mA 4.8 5.0 5.2 V
0.5 mA ≤ I
REG
≤ 100 mA 4.75 5.0 5.25 V
6V≤ V
P
≤ 45 V; I
REG
= 0.5 mA 4.75 5.0 5.25 V
V
REG(drop)
dropout voltage V
P
= 4.5 V; T
amb
≤ 85 °C;
I
REG
=50mA
- 0.18 0.3 V
V
REG(stab)
output voltage long-term
stability
per 1000 h - 20 - mV
V
REG(adj)
output voltage adjustment
range
1.5 - V
P
V
∆V
REG(line)
line input regulation voltage 7 V ≤ V
P
≤ 22 V; I
REG
= 0.5 mA - 1 30 mV
7V≤ V
P
≤ 45 V; I
REG
= 0.5 mA - 1 50 mV
∆V
REG(load)
load output regulation
voltage
0.5 mA ≤ I
REG
≤ 50 mA - 10 50 mV
SVRR supply voltage ripple
rejection
f
i
= 120 Hz; V
i(ripple)
= 1 V (RMS);
I
REG
= 0.5 mA
50 60 - dB
V
ref
reference voltage V
P
= 14.4 V 1.181 1.244 1.306 V
I
REG(crl)
output current limit V
REG
> 4 V 0.17 0.3 - A
I
LO(rp)
output leakage current at
reverse polarity
V
P
= −15 V; V
REG
= ≤ 0.3 V - 1 500 µA
V
REG
V
ref
k×= k
R1 R2+
R2
--------------------
= R1 R2 100 kΩ≤+
Table 7: Noise figures
Output current
I
REG
(mA)
Noise figure (µV)
C2=10µF C2=47µF C2 = 100 µF
0.5 550 320 300
50 650 400 400