A8302 Datasheet, PDF (4/45 Pages) Allegro MicroSystems – Dual LNB Supply and Control Voltage Regulators

A8302
Dual LNB Supply and Control Voltage Regulators
Pin-out Diagram
VCP1 1
LNB1 2
BFGATE1 3
TDI1 4
TDI2 5
BFGATE2 6
LNB2 7
VCP2 8
24 VREG
23 SLEEP
22 TCAP2
PAD
21 TCAP1
20 ISET2
19 ISET1
18 TONECTRL2
17 TONECTRL1
Terminal List Table
Number
Name
Function
1
VCP1
Channel 1 gate supply voltage
2
LNB1
Channel 1 output voltage to LNB
3
BFGATE1 Channel 1 gate driver point for the external P-channel bypass MOSFET
4
TDI1
Channel 1 Tone Detect input
5
TDI2
Channel 2 Tone Detect input
6
BFGATE2 Channel 2 gate driver point for the external P-channel bypass MOSFET
7
LNB2
Channel 2 output voltage to LNB
8
VCP2
Channel 2 gate supply voltage
9
BOOST2
Tracking supply voltage to channel 2 linear regulator
10
GNDLX2
Channel 2 boost switch ground
11
LX2
Channel 2 internal boost switch drain node
12
NC
No connect
13
SCL
I²C-compatible clock input
14
SDA
I²C-compatible data input/output
15
ADD
Address select
16
¯¯I ¯R¯¯Q¯
Interrupt request output
17 TONECONTRL1 Apply a 22-kHz tone or tone on-and-off signal to enable/disable internal tone of channel1
18 TONECONTRL2 Apply a 22-kHz tone or tone on-and-off signal to enable/disable internal tone of channel2
19
ISET1
Terminal for external resistor that sets the LNB1 current limit
20
ISET2
Terminal for external resistor that sets the LNB2 current limit
21
TCAP1
Capacitor for setting the rise and fall time of the LNB1 output
22
TCAP2
Capacitor for setting the rise and fall time of the LNB2 output
23
¯S¯ ¯L¯ ¯E¯ ¯E¯ ¯P¯ 
Disables LNB output, boost, I²C communication, and charge pump, to reduce input quiescent current to <15 µA
24
VREG
Analog supply
25
TDO2
Open-drain logic output that transitions high when a 22-kHz tone is present at the TDI2 pin
26
TDO1
Open-drain logic output that transitions high when a 22-kHz tone is present at the TDI1 pin
27
EPF
Early Power Failure warning comparator output
28
GND
Signal ground
29
VIN
Input supply voltage
30
LX1
Channel 1 internal boost switch drain node
31
GNDLX1
Channel 1 boost switch ground
32
BOOST1
Tracking supply voltage to channel 1 linear regulator
–
PAD
Exposed pad for thermal dissipation; connect to the ground plane
Allegro MicroSystems, LLC
4
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com