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A8290 Datasheet(PDF) 1 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) 1 Page - Allegro MicroSystems

 
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LX
Boost
Converter
LNB
BOOST
VIN
220 nF
TCAP
22 nF
Clock
Divider
VCP
VOUT
100 nF
SDA
SCL
I2 C™-
Compatible
Interface
VPump
ADD
Fault Monitor
OCP
PNG
TSD
VUV
EXTM
VDD
VS
IRQ
Charge
Pump
Oscillator
Regulator
Tone
Detect
TDO
TDI
VREG
TDO
TCAP
fsw
fsw
22 kHz
EXTM
TGate
TMode
10 nF
GNDLX
DAC
LNB
Voltage
Control
Wave
Shape
Linear
Stage
C4
10 nF
C13
C7
C8
220 nF
C9
C10
C3
220 nF
R1 R2 R3 R4
L1
33 μH
D1
D3
220 μH
L2
BFC
R5 R6
BFO
BFC
D2
C12
R8
100
C11
0.68 μF
30
R9
D4
BFI
15
R7
1
R10
D5
B
B
B
B
A
GND
C
C
100 μF
C2
100 μF
C5
1 μF
C6
PAD
nF
C1
100
L3
1 H
Description
Intended for analog and digital satellite receivers, this single
low noise block converter regulator (LNBR) is a monolithic
linear and switching voltage regulator, specifically designed to
provide the power and the interface signals to an LNB down
converter via coaxial cable. The A8290 requires few external
components, with the boost switch and compensation circuitry
integrated inside of the device. A high switching frequency is
chosen to minimize the size of the passive filtering components,
further assisting in cost reduction.The high levels of component
integration ensure extremely low noise and ripple figures.
The A8290 has been designed for high efficiency, utilizing
the Allegro® advanced BCD process. The integrated boost
switch has been optimized to minimize both switching and
static losses. To further enhance efficiency, the voltage drop
across the tracking regulator has been minimized.
The A8290 has integrated tone detection capability, to support
full two-way DiSEqC™ communications. Several schemes
are available for generating tone signals, all the way down to
no-load, and using either the internal clock or an external time
source. A DiSEqC™ filter bypass switch is also integrated, to
minimize the output impedance during tone generation.
8290-DS, Rev. 16
Features and Benefits
▪ 2-wire serial I2C™ -compatible interface: control (write) and
status (read)
▪ LNB voltages (16 programmable levels) compatible with
all common standards
▪ Tracking switch-mode power converter for lowest dissipation
▪ Integrated converter switches and current sensing
▪ Output current limit of 900 mA typical, with 48 ms timer
▪ Static current limit circuit allows full current at startup and
1318V output transition; reliably starts wide load range
▪ Push-pull output stage minimizes 1318V and 1813V
output transition times for highly capacitive loads
▪ Adjustable rise/fall time via external timing capacitor
▪ Built-in tone oscillator, factory-trimmed to 22 kHz
facilitates DiSEqC™ tone encoding, even at no-load
▪ Four methods of 22 kHz tone generation, via I2C™ data
bits and/or external pin
▪ Filter bypass MOSFET minimizes losses during tone transmit
▪ 22 kHz tone detector facilitates DiSEqC™ 2.0 decoding
▪ Diagnostics for output voltage level, input supply UVLO,
and DiSEqC™ tone output
▪ Auxiliary modulation input
▪ LNB overcurrent with timer
▪ Cable disconnect diagnostic
Single LNB Supply and Control Voltage Regulator
Continued on the next page…
Functional Block Diagram
A8290
R9-C11 network is needed only when a highly
inductive load is applied, such as ProBand LNB.
B
A
D2, D4, D5, and R10 are used for surge protection.
Either C12 or C9 should be used, but not both.
C
Package: 28-pin QFN (suffix ET)
5 mm × 5 mm
(Not to scale)


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