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A8285SLB Datasheet(PDF) 3 Page - Allegro MicroSystems

Part # A8285SLB
Description  LNB Supply and Control Voltage Regulator
PDF  17 Pages
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A8285SLB Datasheet(HTML) 3 Page - Allegro MicroSystems

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Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
A8285/A8287
LNB Supply and Control Voltage Regulator
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Set-point Accuracy, load and line
regulation
V
O1
Relative to target voltage selected, with:
I
LOAD = 0 to 500 mA
-4.5
0
4.5
%
Supply Current
I
CC
ENB = Low, LNB output disabled
––
7mA
I
CCEN
ENB = High, LNB output enabled, I
LOAD = 0mA
––
15
mA
Boost Switch-On Resistance
R
DSBOOST
T
J = 25 °C, ILOAD = 500mA
–
400
500
m
Ω
Switching Frequency
fo
–
320
352
384
kHz
Switch Current Limit
–
V
IN = 12 V
2.0
3
4.0
A
Linear Regulator Voltage Drop
ΔV
REG
V
BOOST – VLNB, no tone signal, ILOAD = 500 mA
400
600
800
mV
Slew Rate Current on TCAP
I
CAP
Charging
–12.5
–10
–7.5
μA
Discharging
7.5
10
12.5
μA
Output Voltage Slew Period
t
slew
V
LNB = 13 to 18 V, TCAP = 6.8 nF, ILOAD = 500 mA
–
500
–
μs
Output Reverse Current
I
OR
ENB = Low, V
LNB = 28 V with C4 fully charged
–
15
mA
Ripple and Noise on LNB Output
V
RN
See notes 1 and 2
––
50
mV
pp
Protection Circuitry
Overcurrent Limit
I
LIM
High limit
Low limit
550
400
700
500
850
600
mA
mA
Overcurrent Disable Time
t
DIS
–
1.2
–
1.7
ms
V
IN Undervoltage Threshold
UV
OFF
Guaranteed turn-off
8.65
9.15
9.65
V
V
IN Turn-On Threshold
UV
ON
Guaranteed turn-on
8.75
9.25
9.75
V
Power-Not-Good Flag Set
PNG
set
–
77
85
93
%V
LNB
Power-Not-Good Flag Reset
PNG
reset
–
82
90
98
%V
LNB
Thermal Shutdown Threshold
T
J
See note 1
–
165
–
°C
Thermal Shutdown Hysteresis
ΔT
J
See note 1
–
20
–
°C
ELECTRICAL CHARACTERISTICS
at T
A = +25°C, VIN = 10 to 16 V (unless otherwise noted)
Continued on next page



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