8178 datasheet(2/4 Pages) ALLEGRO

2 / 4 page

8178

LOW-DROPOUT,

7.7 V PREREGULATOR

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

ELECTRICAL CHARACTERISTICS over operating temperature range.

Limits

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Output Voltage

6.9 V

≤ V

I ≤ 24 V

6.5

7.7

8.8

2.5 V

≤ V

I ≤ 6.9 V

I - 0.4

—

I = 120 V, pulse test

—

Output Volt. Temp. Coeff.

—

TBD

mV/

°C

Line Regulation

∆V

∆VI)

—

TBD

Load Regulation

∆V

∆IO)

—

TBD

Quiescent Current

I = 13.5 V, IO = 0

—

2.5

2.5 V

≤ V

I ≤ 8 V, IO = 0

—

5.6

Power Dissipation

I = 13.5 V, IO = 15 mA

—

130

Thermal Resistance*

RθJA

A8178LLR

—

575

—

°C/W

A8178LLT

—

200

—

°C/W

Typical values are at T

A = +25°C and are given for circuit design information only.

Mounted on 2.24" x 2.24" solder-coated copper-clad board in still air.

INTERNAL PROTECTIVE FEATURES

ISO

Pulse No.

Test

Test Conditions (at TA = +25°C)

Inductive Turn Off (Negative)

VS = -100 V, RS = 10 Ω, tr = 1 µs, td = 2 ms

Inductive Turn Off (Positive)

VS = 100 V, RS = 10 Ω, tr = 1 µs, td = 50 µs, non-operating

Capacitive/Inductive Coupling (Neg)

VS = -150 V, RS = 50 Ω, tr = 50 ns, td = 100 ns

Capacitive/Inductive Coupling (Pos)

VS = 100 V, RS = 50 Ω, tr = 50 ns, td = 100 ns

Reverse Battery

VS = -14 V, td = 20 s, non-operating

Load Dump

VS = 86.5 V, RS = 0.5 Ω, tr = 5 ms, td = 400 ms

Ignition Coil Disconnect

VS = -300 V, RS = 30 Ω, tr = 60 µs, td = 300 µs

EXTERNAL PROTECTION REQ’D

Field Decay (Negative)

VS = -80 V, RS = 10 Ω, tr = 5 ms, td = 100 ms

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