8284 Datasheet, PDF (6/8 Pages) Allegro MicroSystems – TWO-OUTPUT LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR

8284
TWO-OUTPUT LNB SUPPLY AND
CONTROL-VOLTAGE REGULATOR
Symbol
OSEL
OLF
VBULK
LNBB
NC
GND
SENSE
LNBA
LX
VIN
TCAP
LLC
VSEL1
VSEL0
EN
ENT
GND
CPUMP
VPUMP
PUMPX
VINT
EXTM
Terminal Configuration
Terminal
1
2
3
4
5
6, 7
8
9
10
11
12
13
14
15
16
17
18, 19
20
21
22
23
24
Function
Logic input: selects between LNBA (when low) and
LNBB (when high)
Overload flag output: low when I_O > I_OM or T_J > 165°C,
high when I_O < I_OM and T_J < 130°C
Tracking supply voltage to linear regulators
Output voltage to LNBB
No (internal) connection
Ground
Current limit setup resistor
Output voltage to LNBA
Inductor drive point
Supply input voltage (minimum, VLNB + 2.5 V)
Capacitor for setting the rise and fall time of the outputs
Logic input: when high, increases output voltage by 1 V
for line length compensation
Logic input: output voltage select
Logic input: output voltage select
Logic input: when high, enables device (LNB on)
Logic input: when high, enables internal 22 kHz
modulation
Ground
High side of charge-pump capacitor
Gate supply voltage for high-side drivers
Charge-pump drive
Bypass capacitor for internal voltage reference
External modulation input
115 Northeast Cutoff, Box 15036
6
Worcester, Massachusetts 01615-0036 [phone]