a8286 Allegro MicroSystems, Inc., a8286 Datasheet - Page 4
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a8286
Manufacturer Part Number
a8286
Description
Dual Lnb Supply And Control Voltage Regulator
Manufacturer
Allegro MicroSystems, Inc.
Datasheet
1.A8286.pdf
(19 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
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Manufacturer:
ALLEGRO/雅丽高
Quantity:
20 000
Part Number:
a8286SETTR-T
Manufacturer:
ALLEGRO/雅丽高
Quantity:
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Part Number:
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Quantity:
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A8286
Continued on the next page…
ELECTRICAL CHARACTERISTICS
General
Set-Point Accuracy, Load and Line Regulation
Supply Current
Boost Switch On Resistance
Switching Frequency
Switch Current Limit
Linear Regulator Voltage Drop
TCAP Pin Current
Output Voltage Rise Time
Output Voltage Pull-Down Time
Output Reverse Current
Ripple and Noise on LNB Output
Protection Circuitry
Output Overcurrent Limit
Overcurrent Disable Time
VIN Undervoltage Lockout Threshold
VIN Turn On Threshold
Undervoltage Hysteresis
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Power Not Good Flag Set
Power Not Good Flag Reset
Power Not Good Hysteresis
Cable Disconnect Boost Voltage
Characteristics
4
2
2
2
2
3
Dual LNB Supply and Control Voltage Regulator
at T
A
= 25°C, V
R
PNG
DS(on)BOOST
V
PNG
PNG
Symbol
V
I
∆V
t
t
I
UVLOHYS
I
DISCHG
V
I
I
r(VLNB)
LIMLNB
V
f(VLNB)
I
LIMSW
rip,n(pp)
V
IN(On)
IN(Off)
I
RLNB
t
∆T
f
CHG
UVLO
Err
IN(th)
SW
DIS
T
CAD
REG
RESET
J
SET
HYS
J
IN
= 8 to 16 V, unless noted otherwise
Relative to selected V
I
ENB bit = 0, LNB output disabled, V
ENB bit = 1, LNB output enabled, I
mA, V
I
V
V
I
TCAP capacitor (C7) charging
TCAP capacitor (C7) discharging
For V
I
For V
I
ENB bit = 0, V
(C5) fully charged
20 MHz BWL; reference circuit shown in
Functional Block diagram; contact Allegro for
additional information on application circuit
board design
V
V
V
With respect to V
With respect to V
With respect to V
CADT bit = 1, ENB bit = 1, VSEL0 through
VSEL3 = 1
LOAD
LOAD
LOAD
LOAD
LOAD
IN
BOOST
BOOST
IN
IN
= 10 V, V
falling
rising
LNB
LNB
= 0 to 500 mA
= 500 mA
= 500 mA
= 500 mA
= 0 mA
IN
– V
– V
= 12 V
13 → 18 V; C
18 → 13 V; C
LNB
LNB
OUT
, no tone signal,
LNB
Test Conditions
= 800 mV
= 20.3 V
LNB
LNB
LNB
= 33 V , BOOST capacitor
LNB
TCAP
LOAD
target level,
= 5.6 nF,
= 100 μF,
1
LOAD
IN
= 12 V
= 0
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
–12.5
Min.
–4.5
40.0
7.05
7.40
22.0
320
600
800
7.5
77
82
–
–
–
–
–
–
–
–
–
–
–
–
Typ.
12.5
7.35
7.70
22.8
300
352
800
–10
500
900
350
165
3.8
10
30
48
20
85
90
–
–
–
1
5
1000
1000
Max.
12.0
20.0
–7.5
12.5
56.0
7.65
8.00
23.5
600
384
4.5
93
98
–
–
–
5
–
–
–
–
–
mV
Units
kHz
mΩ
mV
mV
mA
mA
mA
mA
μA
μA
ms
ms
μs
°C
°C
%
%
%
%
A
V
V
V
PP
4