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TDA3668

Very low dropout voltage/quiescent current 5 V regulator with overvoltage switch off

Philips Electronics 

Philips Semiconductors

Very low dropout voltage/quiescent current

5 V regulator with overvoltage switch off

Preliminary specification

TDA3668AT

FEATURES

• Fixed 5 V, 100 mA regulator

• Supply voltage range up to 50 V

• Very low quiescent current of 15 µA (typical value)

• Very low dropout voltage

• High ripple rejection

• Very high stability

– Electrolytic capacitors: Equivalent Series Resistance

(ESR) < 38 Ω at IREG ≤ 25 mA

– Other capacitors: 100 nF at 200 µA ≤ IREG ≤ 100 mA.

• Pin compatible family TDA3661 to TDA3676

• Protections:

– Reverse polarity safe (down to −25 V without high

reverse current)

– Negative transient of 50 V (RS = 10 Ω, t < 100 ms)

– Able to withstand voltages up to 18 V at the output

(supply line may be short-circuited)

– ESD protected for all pins

– DC short-circuit safe to ground and VP of regulator

output

– Temperature protection at Tj > 150 °C

– Load dump protection, which will switch off VREG

during load dump.

GENERAL DESCRIPTION

The TDA3668AT is a fixed 5 V voltage regulator with a

very low dropout voltage and quiescent current, which

operates over a wide supply voltage range.

The regulator should use a supply voltage of VP ≤ 50 V.

It has a temperature range of −40 °C ≤ Tamb ≤ +125 °C,

and it is available as an automotive version in an

SO8 package.

QUICK REFERENCE DATA

SYMBOL

PARAMETER

Supply

VP

supply voltage

Iq

quiescent supply current

Regulator output

VREG

output voltage

VREG(drop)

dropout voltage

CONDITIONS

MIN. TYP. MAX. UNIT

regulator on

3

14.4 24

V

load dump; t ≤ 50 ms; tr ≥ 2.5 ms

−

−

50

V

VP = 14.4 V; IREG = 0 mA

−

15

30

µA

8 V ≤ VP ≤ 22 V; IREG = 0.5 mA

4.8 5.0 5.2 V

6 V ≤ VP ≤ 24 V; IREG = 0.5 mA;

Tamb ≤ 125 °C

4.75 5.0 5.25 V

VP = 14.4 V; 0.5 mA ≤ IREG ≤ 100 mA; 4.75 5.0

Tamb ≤ 125 °C

5.25 V

VP = 4.5 V; IREG = 50 mA

−

0.18 0.3 V

ORDERING INFORMATION

TYPE

NUMBER

TDA3668AT

NAME

SO8

PACKAGE

DESCRIPTION

plastic small outline package; 8 leads; body width 3.9 mm

VERSION

SOT96-1

2000 Feb 01

2

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