8283 Datasheet, PDF (6/8 Pages) Allegro MicroSystems – LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR

8283
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATOR
Terminal Configuration
Symbol
OSEL
Terminal
1
OLF
VBULK
MIOUT
MI
GND
SENSE
LNB
LX
VIN
TCAP
LLC
VSEL1
VSEL0
EN
ENT
GND
CPUMP
VPUMP
PUMPX
VINT
EXTM
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 LNB on (when high) and
bypass switch closed (when low)
Overload flag output: low when I_O > I_OM or I_O > I_SWM or
T_J > 165°C, high when I_O < I_OM and I_O < I_SWM and T_J < 130°C
Tracking supply voltage to linear regulators
Output voltage from MI (connect to terminal 9)
Master input
Ground
Current limit setup resistor
Output voltage to LNB (connect to terminal 4)
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
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
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6
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