8178 Datasheet, PDF (2/4 Pages) Allegro MicroSystems – LOW-DROPOUT, 7.7 V PREREGULATOR

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*
V_O
α_VO
∆V_O(∆VI)
∆V_O(∆IO)
I_Q
P_d
R_θJA
6.9 V ≤ V_I ≤ 24 V
2.5 V ≤ V_I ≤ 6.9 V
V_I = 120 V, pulse test
V_I = 13.5 V, I_O = 0
2.5 V ≤ V_I ≤ 8 V, I_O = 0
V_I = 13.5 V, I_O = 15 mA
A8178LLR
A8178LLT
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.
Min.
6.5
V_I - 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 T_A = +25°C)
V_S = -100 V, R_S = 10 Ω, t_r = 1 µs, t_d = 2 ms
V_S = 100 V, R_S = 10 Ω, t_r = 1 µs, t_d = 50 µs, non-operating
V_S = -150 V, R_S = 50 Ω, t_r = 50 ns, t_d = 100 ns
V_S = 100 V, R_S = 50 Ω, t_r = 50 ns, t_d = 100 ns
V_S = -14 V, t_d = 20 s, non-operating
V_S = 86.5 V, R_S = 0.5 Ω, t_r = 5 ms, t_d = 400 ms
V_S = -300 V, R_S = 30 Ω, t_r = 60 µs, t_d = 300 µs
V_S = -80 V, R_S = 10 Ω, t_r = 5 ms, t_d = 100 ms
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1996 Allegro MicroSystems, Inc.