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A8290 Datasheet(PDF) 4 Page - Allegro MicroSystems

Part No. A8290
Description  Single LNB Supply and Control Voltage Regulator
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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A8290 Datasheet(HTML) 4 Page - Allegro MicroSystems

 
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Single LNB Supply and Control Voltage Regulator
A8290
4
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ELECTRICAL CHARACTERISTICS at T
A = 25°C, VIN = 8 to 16 V, unless noted otherwise
1
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
General
Set-Point Accuracy, Load and Line Regulation
Err
Relative to selected VLNB target level,
ILOAD = 0 to 500 mA
–3
3
%
Supply Current
IIN(Off)
ENB bit = 0, LNB output disabled, VIN = 12 V
10.0
mA
IIN(On)
ENB bit = 1, LNB output enabled,
ILOAD = 0 mA, VIN = 12 V
19.0
mA
Boost Switch On Resistance
RDS(on)BOOST ILOAD = 500 mA
300
600
Switching Frequency
fSW
320
352
384
kHz
Switch Current Limit
ILIMSW
VIN = 10 V, VOUT = 20.3 V
3.8
A
Linear Regulator Voltage Drop
∆VREG
VBOOST – VLNB, no tone signal,
ILOAD = 500 mA
600
800
1000
mV
TCAP Pin Current
ICHG
TCAP capacitor (C7) charging
–12.5
–10
–7.5
μA
IDISCHG
TCAP capacitor (C7) discharging
7.5
10
12.5
μA
Output Voltage Rise Time2
tr(VLNB)
For VLNB 13→18 V; CTCAP = 5.6 nF,
ILOAD = 500 mA
500
μs
Output Voltage Pull-Down Time2
tf(VLNB)
For VLNB 18→13 V; CLOAD = 100 μF,
ILOAD = 0 mA
12.5
ms
Output Reverse Current
IRLNB
ENB bit = 0, VLNB = 33 V , BOOST capacitor
(C5) fully charged
–1
5
mA
Ripple and Noise on LNB Output3
Vrip,n(pp)
20 MHz BWL; reference circuit shown in
Functional Block diagram; contact Allegro for
additional information on application circuit
board design
–30
mVPP
Protection Circuitry
Output Overcurrent Limit4
ILIMLNB
VBOOST – VLNB = 800 mV
800
900
1000
mA
Overcurrent Disable Time
tDIS
40
48
56
ms
VIN Undervoltage Lockout Threshold
VUVLO
VIN falling
7.05
7.35
7.65
V
VIN Turn On Threshold
VIN(th)
VIN rising
7.40
7.70
8.00
V
Undervoltage Hysteresis
VUVLOHYS
350
mV
Thermal Shutdown Threshold2
TJ
165
°C
Thermal Shutdown Hysteresis2
∆TJ
–20
°C
Power Not Good Flag Set
PNGSET
With respect to VLNB
77
85
93
%
Power Not Good Flag Reset
PNGRESET With respect to VLNB
82
90
98
%
Power Not Good Hysteresis
PNGHYS
With respect to VLNB
–5
%
Cable Disconnect Boost Voltage
VCAD
CADT bit = 1, ENB bit = 1, VSEL0 through
VSEL3 = 1
22.0
22.8
23.5
V
Cable Disconnect Set
VCADSET
20.16
21.00
21.84
V
Cable Disconnect Current Source
ICADSRC
VLNB = 21.00 V, VBOOST = 22.8 V
1.0
1.75
2.5
mA
Continued on the next page…


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