8187 Datasheet, PDF (2/8 Pages) Allegro MicroSystems – LOW-DROPOUT, 3.3 V REGULATOR . HIGH EFFICIENCY

8187
LOW-DROPOUT,
3.3 V REGULATOR
FUNCTIONAL BLOCK DIAGRAM
IN ¹
BIAS
GND ²
DRIVE
3 _OUT
ERROR
AMP
BANDGAP
REF.
TAB
Dwg. FS-012-4
MAXIMUM ALLOWABLE OUTPUT CURRENT with device mounted on 2.24" x 2.24"
(56.9 mm x 56.9 mm) solder-coated copper-clad board in still air.
T_A
25°C
Maximum Allowable Output Current in Milliamperes with V_I = 8 V, T_J = 150°C, Period ≤10 s*
dc (Duty Cycle)
100%
90%
80%
70%
60%
50%
40%
30%
100
115
125
145
150
150
150
150
20%
150
50°C
80
90
100
115
135
150
150
150
150
70°C
65
70
80
90
110
130
150
150
150
85°C
50
60
65
75
85
105
130
150
150
* I_O = (T_J - T_A)/([V_I - V_O] R_θJA • dc) = (150 - T_A)/(4.7 • 258 • dc)
Output current rating can be increased (to 150 mA maximum) by heat sinking or reducing the input voltage. Conditions that produce excessive
junction temperature will activate device thermal shutdown circuitry. These conditions can be tolerated but should be avoided.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1995, 2000 Allegro MicroSystems, Inc.