V PREREGULATOR. 8178 Datasheet

8178 Datasheet PDF, Equivalent


Part Number

8178

Description

LOW-DROPOUT/ 7.7 V PREREGULATOR

Manufacture

Allegro MicroSystems

Total Page 4 Pages
PDF Download
Download 8178 Datasheet


8178 Datasheet
8178
PRODUCT PREVIEW
(Subject to change without notice)
April 5, 1996
3
VR
12
7.7 V
VR
LOW-DROPOUT,
7.7 V PREREGULATOR
Designed specifically to meet the stringent requirements of automo-
tive applications, the A8178LLR and A8178LLT provide an output
voltage of 7.7 V ±15% for supply voltages greater than 6.9 V. They
also provide a low-dropout tracking output for supply voltages down to
2.5 V. These regulators are intended to be used with sensitive automo-
tive electronics systems that do not have the capability of low dropout
operation and cannot withstand the high-voltage transients typical of
automotive applications. These 7.7 V preregulators will withstand all
ISO pulses (ignition coil disconnect requires an external diode) and will
continue to operate during positive power supply transients (noise).
These devices are supplied in small-outline plastic transistor
packages for surface-mount applications. The A8178LLR is supplied in
the minimum footprint SOT-23/TO-236AB; the A8178LLT is furnished in
the SOT-89/TO-243AA for increased allowable package power dissipa-
tion.
12
3
Dwg. PD-0xx
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VI . . . . . . . . . . . . . . 30 V
Reverse Input Voltage, VRI . . . . -120 V
Output Current, IO . . . . . . . . . . . . TBD*
Operating Temperature Range,
TA . . . . . . . . . . . . -40°C to +150°C
Junction Temperature, TJ . . . . +150°C
Storage Temperature Range,
TS . . . . . . . . . . . . -40°C to +170°C
* Output current rating is limited by input voltage,
duty cycle, and ambient temperature. Under
any set of conditions, do not exceed a junction
temperature of +150°C. See next page.
This document contains information on a product under development. Allegro
MicroSystems, Inc. reserves the right to change or discontinue this product without
notice.
Always order by complete part number: A8178LLT .

8178 Datasheet
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 , tr = 1 µs, td = 2 ms
VS = 100 V, RS = 10 , tr = 1 µs, td = 50 µs, non-operating
VS = -150 V, RS = 50 , tr = 50 ns, td = 100 ns
VS = 100 V, RS = 50 , tr = 50 ns, td = 100 ns
VS = -14 V, td = 20 s, non-operating
VS = 86.5 V, RS = 0.5 , tr = 5 ms, td = 400 ms
VS = -300 V, RS = 30 , tr = 60 µs, td = 300 µs
VS = -80 V, RS = 10 , tr = 5 ms, td = 100 ms
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1996 Allegro MicroSystems, Inc.


Features Datasheet pdf 8178 PRODUCT PREVIEW (Subject to change without notice) April 5, 1996 Data She et 27468.22 LOW-DROPOUT, 7.7 V PREREGU LATOR Designed specifically to meet the stringent requirements of automotive a pplications, the A8178LLR and A8178LLT provide an output voltage of 7.7 V ±15 % for supply voltages greater than 6.9 V. They also provide a low-dropout trac king output for supply voltages down to 2.5 V. These regulators are intended t o be used with sensitive automotive ele ctronics systems that do not have the c apability of low dropout operation and cannot withstand the high-voltage trans ients typical of automotive application s. These 7.7 V preregulators will withs tand all ISO pulses (ignition coil disc onnect requires an external diode) and will continue to operate during positiv e power supply transients (noise). Thes e devices are supplied in small-outline plastic transistor packages for surfac e-mount applications. The A8178LLR is s upplied in the minimum footprint SOT-23/TO-236AB; the A8178LLT i.
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