A8282SLB [ALLEGRO]
LNB SUPPLY AND CONTROL-VOLTAGE REGULATORS; LNB电源和控制电压稳压器
| 型号： | A8282SLB |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | LNB SUPPLY AND CONTROL-VOLTAGE REGULATORS |
| 文件： | 总14页 (文件大小：372K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
8281 AND
8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
Intended for analog and digital satellite receivers, these low-noise
block converter regulators (LNBRs) are monolithic linear and switching
voltage regulators specifically designed to provide the power and
interface signals to the LNB down converter via the coaxial cable. If the
device is in standby mode (EN terminal low), the regulator output is
disabled, allowing the antenna down converters to be supplied or
controlled by other satellite receivers sharing the same coaxial cable. In
this mode, the device will limit the output reverse current.
A8282SLB
NC
OLF
1
2
3
4
5
6
7
8
24 EXTM
VINT
23
22
VBULK
PUMPX
NC
NC
21 VPUMP
The A8281SLB output is set to 13 or 18-V by the VSEL terminal. It
is supplied in a 16-lead SOIC power-tab package. The power tabs are at
ground potential and need no electrical isolation.
CPUMP
GND
20
19
GND
GND
18 GND
ENT
The A8282SLB output is set to 12, 13, 18, or 20-V by the VSEL
terminals. Additionally, it is possible to increase the selected voltage by
1-V to compensate for the voltage drop in the coaxial cable (LLC
terminal high). It is supplied in a 24-lead SOIC power-tab package.
The power tabs are at ground potential and need no electrical isolation.
The A8282SLB is an improved version of the A8283SLB, without a
bypass switch.
SENSE
17
LNB 9
LX 10
16 EN
BUCK
15 VSEL0
11
REG.
VSEL1
LLC
VIN
14
13
TCAP 12
FEATURES
Dwg. PP-072-2
■ LNB selection and standby function
■ Built-in tone oscillator factory trimmed to 22-kHz, facilitates
DiSEqC™ (a trademark of EUTELSAT) encoding
■ Tracking switch-mode power converter for lowest dissipation
■ Externally adjustable short-circuit protection
■ LNB short-circuit protection and diagnostics
■ Auxiliary modulation input
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Supply Voltage, VIN ........................... 47-V
Output Current, ILNB .... Internally Limited
Output Voltage Range, VLNB .. -1-V to +22-V
■ Internal over-temperature protection
■ Reverse-current protection
Logic Input Voltage Range,
VI ................................... -0.3-V to +7-V
Flag Output Voltage, VOLF ................... 7-V
Operating Temperature Range,
■ Cable length compensation (A8282SLB only)
TA ................................. -20°C to +85°C
Junction Temperature, TJ ................ +150°C
Storage Temperature Range,
These devices incorporate features that have patents pending.
TS .............................. -55°C to +150°C
Always order by complete part number, e.g., A8282SLB .
8281 AND 8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
FUNCTIONAL BLOCK DIAGRAM
and typical application
100 µH
RS 200 mΩ
0.1 µF
0.1 µF
VIN
47 V MAX
+
+
100 µF
100 µF
VINT
(A8282 ONLY)
BOOST
VOLTAGE
VOLTAGE
REG.
–
+
BUCK
CONV.
CHARGE
PUMP
OVER-
–
+
–
+
CURRENT
7 V
EN
135 mV
5 V
VREF
176 kHz
DiSEqC TERMINATION
352 kHz
900 mV
–
÷2
15 Ω
+
–
25 kΩ
+
ENT
180 µH
0.22 µF
LNB
5 kΩ
5 kΩ
22 kHz TONE
÷8
&
WAVESHAPING
EXTM
TSD
0.1 µF
OLF
OVER-
CURRENT
1 kΩ
TCAP
10 nF
Dwg. FP-051-2
A8281SLB Output Voltage Select Table
A8281SLB
VSEL1
VLNB
13 V
18 V
L
H
PUMPX
VPUMP
CPUMP
GND
1
2
3
4
5
6
16
15
14
13
12
EXTM
OLF
VBULK
A8282SLB Output Voltage Select Table
GND
VSEL0
VSEL1
LLC
L
VLNB
13 V
14 V
18 V
19 V
12 V
13 V
20 V
21 V
SENSE
ENT
L
L
L
L
L
H
H
L
L
H
H
H
L
H
L
H
L
H
LNB
LX
EN
11
10
9
L
BUCK
VSEL1
TCAP
7
8
H
H
H
H
VIN
REG.
Dwg. PP-072-3
115 Northeast Cutoff, Box 15036
2
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2003 Allegro MicroSystems, Inc.
8281 AND 8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
ELECTRICAL CHARACTERISTICS: unless otherwise noted at TJ < 125°C, CLNB = 0.1 µF,
4.5-V + VLNB < VIN < 47-V
Limits
Characteristic
Symbol
VIN
Test Conditions
Min.
4.5+VLNB
—
Typ. Max. Units
Supply Voltage Range
Operating
—
0
47
V
%
%
Output Voltage Error
(reference Output Voltage
Select table)
EVLNB
6 mA ≤ ILNB ≤ 750 mA, ENT = L
±4.5
±4.5
12 mA ≤ ILNB ≤ 750 mA, ENT = H,
average VLNB
—
0
Output Reverse Current
Buck Switch On Resist.
IRLNB
EN = L, VLNB = 22 V, VIN = 22 V or floating
TJ = 25°C, ILNB = 750 mA
—
—
—
1
1
5
mA
Ω
rDS(on)
0.57 0.67
0.84 0.94
TJ = 125°C, ILNB = 750 mA
Ω
Buck Switch Current Limit
Switching Frequency
Linear Reg. Volt. Drop
Logic Input Voltage
IBSM
fO
—
2.5
A
16 x ftone
320
700
—
2
352
384
kHz
mV
V
∆VBUCK
VIL
VSENSE – VLNB, ENT = L, ILNB = 750 mA
900 1100
—
—
0.8
—
10
1
VIH
V
Logic Input Current
Supply Current
IIH
VIH = 5 V
—
—
—
<1.0
0.25
6
µA
mA
mA
IIN
Outputs disabled (EN = L)
EN = H, ILNB = 0
10
Tone Characteristics
Tone Frequency
ftone
ENT = H
20
400
40
22
650
—
24
900
60
kHz
mV
%
Tone Amplitude
Vtone(PP)(ENT) ENT = H, 12 mA ≤ ILNB ≤ 750 mA
Tone Duty Cycle
dctone
tr, tf
ENT = H, 12 mA ≤ ILNB ≤ 750 mA
ENT = H, 12 mA ≤ ILNB ≤ 750mA
Tone Rise or Fall Time
5
10
15
µs
External Modulation
Tone Amplitude
Vtone(PP)(EXTM) f = 22 kHz square wave, ILOAD = 12 mA to
450 mA, VIN = 100mV to 125 mV;
VPP ac coupled
400
550
800
mV
External Modulation Input
Voltage Range
VEXTM(PP)
AC coupled
100
4
—
—
125
10
mV
External Modulation Input
Impedance
ZEXTM
f = 22 kHz
kΩ
continued next page
NOTES: 1. Typical data is for design information only.
2. Negative current is defined as coming out of (sourcing) the specified device terminal.
www.allegromicro.com
3
8281 AND 8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
ELECTRICAL CHARACTERISTICS: unless otherwise noted at TJ ≤ 125°C, CLNB = 0.1-µF,
4.5-V + VLNB ≤ VIN ≤ 47-V.
Limits
Characteristic
Symbol Test Conditions
Min.
Typ. Max. Units
Protection Circuitry
Current-Limiting Threshold
Overload Flag Output Low
Overload Flag Leakage Current
Thermal Shutdown Temp.
Thermal Shutdown Hysteresis
VILNB(th) VBULK – VSENSE
115
—
135
0.28
<1.0
165
20
155
0.5
10
mV
V
VOLF
IOLF
TJ
IOLF = 8-mA
VOLF = 5.5-V
—
µA
°C
°C
—
—
∆TJ
—
—
NOTES: 1. Typical data is for design information only.
2. Negative current is defined as coming out of (sourcing) the specified device terminal.
115 Northeast Cutoff, Box 15036
4
Worcester, Massachusetts 01615-0036 (508) 853-5000
8281 AND 8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
FUNCTIONAL DESCRIPTION
Buck regulator. A current-mode buck converter
provides the linear regulator a supply voltage that
tracks the selected LNB output voltage. The buck
converter operates at 16 times the internal tone fre-
quency, nominally 352-kHz.
mum dc plus ac (tone) load current required, internal
VILNB(th) tolerance, and sense resistor accuracy. For
750-mA applications, a precision 140-mΩ resistor is
recommended. For 500-mA applications, the resistor
value can be raised to 200-mΩ.
The tracking regulator provides minimum power
dissipation across the range of output voltages by
adjusting the SENSE terminal voltage, nominally
900-mV above the LNB output voltage. The tracking
regulator also provides adequate headroom for tone
injection.
In operation, the short-circuit protection produces
current limiting at the input due to the tracking con-
verter. If the output is shorted, the linear regulator
will limit the output current to ILNBM
.
Fault output. Short-circuit or thermal shutdown
will cause the OLF terminal, an open-drain diagnostic
output flag, to go LOW.
Linear regulator. The output linear regulator will
sink or source current. This allows tone modulation
into a capacitive load of 0.1-µF over the output
current range of 12-mA to 750-mA.
Internal tone modulation. The ENT (tone enable)
terminal activates the internal tone signal, modulating
the dc output with a 650-mV peak-to-peak trapezoidal
waveform. The internal oscillator is factory trimmed
to provide a tone of 22-kHz. No further adjustment is
required. Burst coding of the tone can be accom-
plished, due to the fast response of the ENT input and
rapid tone response. This allows implementation of
the DiSEqC™ protocols.
Slew rate control. The programmed output volt-
age rise and fall times can be set by an external
capacitor (with an internal 25-kΩ resistor) located on
the TCAP terminal. The range of acceptable capaci-
tor values is 4.7-nF to 47-nF. This feature only
affects the turn-on and programmed voltage rise and
fall times. Modulation is unaffected by the capacitor.
If LNB output voltage rise and fall time limiting is
not required, the TCAP terminal should use a 100-nF
ceramic as a default value to minimize output noise.
If a small value capacitor is used, the rise time will be
limited by the time required to charge the VBULK
capacitor.
External tone modulation. To improve design
flexibility and to allow implementation of proposed
LNB remote control standards, an analog modulation
input terminal is available (EXTM). An appropriate
dc-blocking capacitor must be used to couple the
modulating signal source to the EXTM terminal. The
peak-to-peak input amplitude should stay within
100-mV to 125-mV to ensure the DiSEqC amplitude
specification over the output current range. If exter-
nal modulation is not used, the EXTM terminal
should be decoupled to ground with a 0.1-µF ceramic
capacitor.
Short-circuit limit regulator. The LNB output is
current limited. The short-circuit protection threshold
is set by the value of an external resistor, RS, in
conjunction with an internal 135-mV reference
voltage (VILNB(th)).
RS = 0.135/ILNBM
where ILNBM is the desired current-limit value. The
sense resistor should be chosen based on the maxi-
www.allegromicro.com
5
8281 AND 8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
APPLICATIONS INFORMATION
Component selection:
of the 22-kHz tone. Operating points above the line
in the following graph will not have excessive over-
shoot.
Input capacitor, CIN. An electrolytic capacitor
should be located as close to the device VIN terminal
as possible. The input current is a square wave with
fast rise and fall times so the capacitor must be able to
handle the rms current without excessive temperature
rise. The value of this capacitor is not as important as
the ESR. The worst-case current is with maximum
load current, minimum VIN, and maximum VLNB
(highest switch duty cycle). Choose a capacitor with
a ripple current rating greater than
125
100
75
MINIMAL OVERSHOOT
50
Icin = ILNB x 1.2 x VLNB(max)/VIN(min)
EXCESSIVE OVERSHOOT
Buck inductor, L1. A 100-µH power inductor is
appropriate for all operating conditions. The rated
saturation current of the inductor must be greater than
1.3-A. To maximize efficiency, the dc resistance
should be less than 350-mΩ.
25
0
0.5
1.0
1.5
0
OUTPUT CAPACITANCE IN µF
Dwg. GP-074
Layout notes:
Clamp diode, D1. A Schottky diode is required at
the switching node LX. This diode should be rated at
1.5 times the maximum load current.
1. The printed wiring board should use a heavy
ground plane. A two-sided board with ground planes
on both sides of the board is most desirable. Several
copper vias under the device can be used to connect
the ground planes and enhance thermal performance.
Output capacitor, CBULK. A low-ESR (<200-mΩ)
electrolytic capacitor is recommended to minimize
the ripple voltage. Less than 50-mV peak-to-peak is a
reasonable goal.
2. For optimum electrical and thermal performance,
the device should be soldered directly onto the board.
Vripple(PP) = ESR x Iripple(max)
3. Keep the sense resistor traces as short and as wide
as possible to lower trace resistance.
where Iripple(max) = VBULK(min) x (1 – [VBULK(min)/VIN(max)]) /
(L1 x 352-kHz).
4. Connect the bypass capacitors as close to the
device as possible. The lower value ceramic capaci-
tors should be closer to the device than the
electrolytics. The supply voltage, VIN, should be
decoupled with an electrolytic capacitor placed as
close to the device as possible.
Output capacitor, CLNB. Increasing the output
capacitance, CLNB, will attenuate noise. However,
this is limited by the requirement for low cable
capacitance for 22-kHz tone transmission.
Also, because the linear regulator sink current is
limited, high values of output capacitance combined
with low levels of output current can cause overshoot
5. Place the TCAP capacitor as close to the device as
possible.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6
8281 AND 8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
APPLICATIONS INFORMATION (cont’d)
Grounding. Use a star ground approach at the
device ground terminals. This allows the analog and
power grounds to be kept separate on the PWB up to
the device.
DirecTV®. With the A8282, it is possible to raise
the LNB output voltage 440-mV from the nominal
13-V setting to comply with DirecTV requirements.
This is accomplished by connecting a 1-MΩ resistor
between the VINT and TCAP terminals, sourcing
approximately 2.76-µA into the TCAP node. The
LNB output voltage is approximately six times the
setting of the voltage-select DAC as shown in the
figure.
Noise immunity. LNB systems can have a 50-mV
peak specification for noise on the coaxial cable.
This is easily achievable with proper layout and
following a few guidelines:
1. Use a low-ESR capacitor for VBULK. A maximum
of 200-mΩ is recommended.
VOLTAGE
VINT
REG.
2. The LNB output is sensitive to the TCAP refer-
ence terminal. Keep the PWB traces short and loca-
tion of CTCAP close to the device. This terminal is a
high-impedance node and noise can be induced from
proximity to an unshielded inductor. If the inductor
can not be placed far enough away to avoid noise
pickup, it is important to ensure that the induced
voltage is out of phase with the switching node LX.
Rotating the inductor can change the phase of the
induced voltage.
TCAP
–
X6
+
25 kΩ
LNB
VOLTAGE
SELECT
Dwg. EP-074
DiSEqC™. The 22-kHz tone is specified to be
compatible with EUTELSAT coaxial cable bus
standards.
3. Be sure to place a 1-µF to 10-µF capacitor on
internal reference VINT (A8282 only).
4. Bypass EXTM with a 0.1-µF ceramic capacitor to
ground.
The LNB output will be able to drive the DiSEqC
termination network. The inductor must pass the dc
current with minimal loss while the parallel resistor
provides the recommended source impedance at
22-kHz. Unidirectional communication systems such
as DiSEqC 1.0 do not need this termination and the
LNB can be directly connected to the coaxial cable.
5. Increasing the output capacitance will attenuate
noise. However, this must be traded off with the
requiremnent for low cable capacitance for 22-kHz-
tone transmission.
13-V to 18-V transition. The LNB output can be
rapidly switched between a high and a low setting as
a method of receiver-to-LNB communication. The
TCAP capacitor will control the slew rate based on
the RC charging.
tr or tf = 25 x 103 x CTCAP ln(VLNB(H)/VLNB(L)
)
www.allegromicro.com
7
8281 AND 8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
APPLICATIONS INFORMATION (cont’d)
Small values of TCAP are used when the desired
transition time is less than a millisecond. In this case,
the minimum rise time is limited by the charge time
of the switching regulator output capacitor. This is
dependent on the LNB load current, peak current limit
in the buck switch, and the output amplitude change.
where TT is the power tab temperature (leads 4 or 13
for the A8281SLB or leads 6, 7, 18, or 19 for the
A8282SLB) and RθJT is 6°C/W.
Package thermal resistances, RθJA, measured on
JEDEC standard “high-K” four layer board:
A8281SLB..................................... 38°C/W
A8282SLB..................................... 35°C/W
tr = CBULK (VLNB(H) – VLNB(L))/I(AV)
where I(AV) is the average current available to charge
the output capacitor and can be estimated by I(AV)
=
measured on two-sided PWB with 3 square inches
(1935 mm2) copper ground area on each side:
A8281SLB..................................... 48°C/W
1.4 – ILNB. Note that this is only a limitation due to
the ability to charge the output capacitor on a low-to-
high change of the LNB voltage. For high-to-low
transitions, the output voltage will be slew limited by
TCAP.
A8282SLB..................................... 45°C/W
The minimum value for CTCAP is 4.7-nF.
Power dissipation. The power dissipated, and
operating junction temperature of the device, can be
estimated to ensure that the device is operating within
the desired thermal budget.
The total device power dissipation (PD) is com-
prised of three components:
PD = PD(bias) + PD(lin) + PD(buck)
where PD(bias) = VIN (IIN – 0.004),
PD(lin) = ∆VBUCK x ILNB
,
PD(buck) = ILNB2 x rDS(on) x VBULK/VIN
where VBULK = ∆VBUCK + (ILNB x RS) + VLNB
.
The device junction temperature can then be
estimated as
TJ = (PD x RθJA) + TA
or
TJ = (PD x RθJT) + TT
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
8
8281 AND 8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
APPLICATIONS INFORMATION (cont’d)
+5 V
5 kΩ
C1
CINT
1
2
3
4
5
24
R1
OLF
+
TCAP
VIN
23
22
21
20
C2
C3
6
7
19
18
17
16
15
14
13
ANALOG
GROUND
8
ENT
9
10
11
ENB
BUCK
VSEL0
D1
REG.
VSEL1
LLC
+
CIN
12
CTCAP
0.22 µF
15 Ω
L2
POWER
GROUND +30 V
VIN
180 µH
DiSEqC TERMINATION
Dwg. EP-072
Typical application
www.allegromicro.com
9
8281 AND 8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
APPLICATIONS INFORMATION (cont’d)
Parts list for typical application
Description
Representative Component
C1, C2, C3,
CBYP, CLNB
0.1-µF/50-V ceramic X7R/X5R
CIN
100-µF/50-V low-ESR electrolytic
100-µF/35-V low-ESR electrolytic
4.7-µF/16-V tantalum electrolytic
1-A/40-V Schottky diode
Nichicon UHD1H101MPT
Nichicon UHC1V101
CBULK
CINT
D1
Sanken EK04
D2
1.2-A/100-V fast-recovery diode
100-µH (750-mA max. load)
Sanken EU 2YX
L1
TDK TSL1112-101K1R4, or
Coilcraft D03316P-104LW
100-µH (500-mA max. load)
180-µH (750-mA max. load)
140-mΩ to 200-mΩ/0.25-W
10-nF ceramic X7R/X5R
TDK TSL0808-101KR80
TDK TSL1112S-181K1R0-PF
Meritek CR04RxxxF
L2
RS
CTCAP
R1
1-MΩ, ±5% (optional, see page 7)
DiSEqC (Digital Satelite Equipment Control) is a trade-
mark of EUTELSAT (European Telecommunications
Satellite Corporation), Paris, France.
DirecTV is a trademark of DirecTV, Inc., a unit of Hughes
Electronics Corp., El Segundo, CA
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
10
8281 AND 8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
Terminal List
A8281SLB A8282SLB
Terminal Terminal
Terminal
Number
1
Name
Number
Terminal Description
NC
–
No (internal) connection
OLF
2
2
Overload flag output: low (fault) when ILNB > ILNBM or
TJ > 165°C, high when ILNB < ILNBM and TJ < 130°C
VBULK
NC
3
–
4
5
6
7
3
4, 5
6, 7
8
Tracking supply voltage to linear regulator
No (internal) connection
Ground and substrate
GND
SENSE
LNB
Current limit setup resistor
Output voltage to LNB
9
LX
10
Inductor drive point
VIN
8
9
11
12
Supply input voltage (minimum, VLNB + 2.5-V)
TCAP
Capacitor for setting the rise and fall time of the outputs for
line-length compensation
LLC
VSEL1
VSEL0
EN
–
10
–
13
14
15
16
Logic input: output voltage select
Logic input: output voltage select
Logic input: output voltage select
Logic input: when high, enables device
11
ENT
GND
12
13
14
15
16
–
17
18, 19
20
Logic input: when high, enables internal 22-kHz modulation
Ground and substrate
CPUMP
VPUMP
PUMPX
VINT
High side of charge-pump capacitor
Gate-supply voltage for high-side drivers
Charge-pump drive
21
22
23
Bypass capacitor for internal voltage reference
External modulation input
EXTM
1
24
www.allegromicro.com
11
8281 AND 8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
A8281SLB
Dimensions in Inches
(for reference only)
16
9
0.0125
0.0091
0.419
0.394
0.2992
0.2914
0.050
0.016
0.020
0.013
1
2
0.050
BSC
3
0° TO 8°
0.4133
0.3977
0.0926
0.1043
Dwg. MA-008-16A in
0.0040 MIN.
Dimensions in Millimeters
(controlling dimensions)
16
9
0.32
0.23
10.65
10.00
7.60
7.40
1.27
0.40
0.51
0.33
1
2
1.27
BSC
3
0° TO 8°
10.50
10.10
2.65
2.35
Dwg. MA-008-16A mm
0.10 MIN.
NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown.
2. Lead spacing tolerance is non-cumulative.
3. Leads 4 and 13 are internally one piece.
4. Supplied in standard sticks/tubes of 47 devices or add “TR” to part number for tape and reel.
115 Northeast Cutoff, Box 15036
12
Worcester, Massachusetts 01615-0036 (508) 853-5000
8281 AND 8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
A8282SLB
Dimensions in Inches
(for reference only)
13
24
0.0125
0.0091
0.419
0.394
0.2992
0.2914
0.050
0.016
0.020
0.013
1
2
3
0.050
0.6141
0.5985
0° TO 8°
BSC
NOTE 1
NOTE 3
0.0926
0.1043
Dwg. MA-008-25A in
0.0040 MIN.
Dimensions in Millimeters
(controlling dimensions)
24
0.32
0.23
10.65
10.00
7.60
7.40
1.27
0.40
0.51
0.33
1
2
1.27
3
BSC
15.60
15.20
0° TO 8°
NOTE 1
NOTE 3
2.65
2.35
Dwg. MA-008-25A mm
0.10 MIN.
NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown.
2. Lead spacing tolerance is non-cumulative.
3. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece.
4. Supplied in standard sticks/tubes of 31 devices or add “TR” to part number for tape and reel.
www.allegromicro.com
13
8281 AND 8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
The products described here are manufactured under one or more
U.S. patents or U.S. patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be
required to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsi-
bility for its use; nor for any infringement of patents or other rights of
third parties which may result from its use.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
14
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