a8291 Allegro MicroSystems, Inc., a8291 Datasheet - Page 3

• Manufacturer Part Number: a8291
• Description: A8291 Single Lnb Supply And Control Voltage Regulator
• Manufacturer: Allegro MicroSystems, Inc.

A8291
Terminal List Table
BOOST
GNDLX
EXTM
VREG
Name
TCAP
GND
ADD
BFO
TDO
VCP
BFC
LNB
PAD
SCL
SDA
IRQ
TDI
VIN
BFI
NC
LX
Single LNB Supply and Control Voltage Regulator
4, 13, 15-18,
20, 21, 23
Number
Pad
19
24
22
27
14
28
26
12
10
25
11
1
6
8
3
7
5
2
9
BOOST
EXTM
TCAP
Address select
Bypass FET control
Bypass FET input (connect to LNB)
Bypass FET output
Tracking supply voltage to linear regulator
External modulation input
Signal ground
Boost switch ground
Interrupt request
Output voltage to LNB
Inductor drive point
No connection
Exposed pad; connect to the ground plane, for thermal dissipation
I
I
Capacitor for setting the rise and fall time of the LNB output
Tone detect input
Tone detect output
Gate supply voltage
Supply input voltage
Analog supply
2
2
TDO
VCP
TDI
C™-compatible clock input
C™-compatible data input/output
NC
Device Pin-out Diagram
1
2
3
4
5
6
7
(Top View)
PAD
Function
21
20
19
18
17
16
15
NC
NC
BFC
NC
NC
NC
NC
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
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