8178 Datasheet, PDF (1/4 Pages) Allegro MicroSystems – LOW-DROPOUT, 7.7 V PREREGULATOR

8178
PRODUCT PREVIEW
(Subject to change without notice)
April 5, 1996
3
VR
1
2
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.
1
2
3
Dwg. PD-0xx
ABSOLUTE MAXIMUM RATINGS
Input Voltage, V_I . . . . . . . . . . . . . . 30 V
Reverse Input Voltage, V_RI . . . . -120 V
Output Current, I_O . . . . . . . . . . . . TBD*
Operating Temperature Range,
T_A . . . . . . . . . . . . -40°C to +150°C
Junction Temperature, T_J . . . . +150°C
Storage Temperature Range,
T_S . . . . . . . . . . . . -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 .