Datasheet

1. General description
The TDA3661 is an adjustable voltage regulator with very low dropout voltage and
quiescent current, which operates over a wide supply voltage range.
2. Features
■ Output adjustable from 1.5 V to V
P
, 100 mA regulator
■ Supply voltage range up to 45 V
■ Very low quiescent current of 15 µA (typical value)
■ Very low dropout voltage
■ Protections:
◆ Reverse polarity safe (down to −25 V without high reverse current)
◆ Negative transient of 50 V (R
S
=10Ω, t < 100 ms)
◆ Able to withstand voltages up to 18 V at the output (supply line may be
short-circuited)
◆ ESD protection on all pins
◆ DC short-circuit safe to ground and V
P
of the regulator output
◆ Temperature protection (at T
j
> 150 °C)
3. Quick reference data
[1] V
REG
= V
ref
× k
TDA3661
Very low dropout voltage/quiescent current adjustable voltage
regulator
Rev. 05 — 28 June 2005 Product data sheet
Table 1: Quick reference data
T
amb
= 25 ° C; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
Supply
V
P
supply voltage regulator on 3 14.4 45 V
I
q
quiescent supply
current
V
P
= 14.4 V; I
REG
= 0 mA - 15 30 µA
Regulator; k = 4.01929
[1]
V
REG
output voltage 8 V ≤ V
P
≤ 22 V; I
REG
= 0.5 mA 4.8 5.0 5.2 V
6V≤ V
P
≤ 45 V; I
REG
= 0.5 mA 4.75 5.0 5.25 V
0.5 mA ≤ I
REG
≤ 100 mA 4.75 5.0 5.25 V
V
ref
reference voltage V
P
= 14.4 V 1.181 1.244 1.306 V
V
REG(drop)
dropout voltage V
P
= 4.5 V; I
REG
=50mA;
T
amb
≤ 85 °C
- 0.18 0.3 V