8178 查看數據表（PDF） - Allegro MicroSystems
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8178 Datasheet PDF : 4 Pages
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8178
LOW-DROPOUT,
7.7 V PREREGULATOR
ELECTRICAL CHARACTERISTICS over operating temperature range.
Characteristic
Symbol Test Conditions
Output Voltage
Output Volt. Temp. Coeff.
Line Regulation
Load Regulation
Quiescent Current
Power Dissipation
Thermal Resistance*
VO
αVO
∆VO(∆VI)
∆VO(∆IO)
IQ
Pd
RθJA
6.9 V ≤ VI ≤ 24 V
2.5 V ≤ VI ≤ 6.9 V
VI = 120 V, pulse test
VI = 13.5 V, IO = 0
2.5 V ≤ VI ≤ 8 V, IO = 0
VI = 13.5 V, IO = 15 mA
A8178LLR
A8178LLT
Typical values are at TA = +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.
Min.
6.5
VI - 0.4
—
—
—
—
—
—
—
—
—
Limits
Typ.
Max.
7.7
8.8
—
—
—
11
—
TBD
—
TBD
—
TBD
—
2.5
—
5.6
—
130
575
—
200
—
Units
V
V
V
mV/°C
mV
mV
mA
mA
mW
°C/W
°C/W
ISO
Pulse No.
1
2
3a
3b
4
5
6
7
INTERNAL PROTECTIVE FEATURES
Test
Inductive Turn Off (Negative)
Inductive Turn Off (Positive)
Capacitive/Inductive Coupling (Neg)
Capacitive/Inductive Coupling (Pos)
Reverse Battery
Load Dump
Ignition Coil Disconnect
EXTERNAL PROTECTION REQ’D
Field Decay (Negative)
Test Conditions (at TA = +25°C)
VS = -100 V, RS = 10 Ω, tr = 1 µs, td = 2 ms
VS = 100 V, RS = 10 Ω, tr = 1 µs, td = 50 µs, non-operating
VS = -150 V, RS = 50 Ω, tr = 50 ns, td = 100 ns
VS = 100 V, RS = 50 Ω, tr = 50 ns, td = 100 ns
VS = -14 V, td = 20 s, non-operating
VS = 86.5 V, RS = 0.5 Ω, tr = 5 ms, td = 400 ms
VS = -300 V, RS = 30 Ω, tr = 60 µs, td = 300 µs
VS = -80 V, RS = 10 Ω, tr = 5 ms, td = 100 ms
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1996 Allegro MicroSystems, Inc.
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