Datasheet

RIADJ2
RIADJ1
GND
VREF
CVREF
IOUTADJ
REFRTN
GND
LM3463
LM3463
www.ti.com SNVS807A –MAY 2012–REVISED MAY 2013
Figure 21. Biasing IOUTADJ from VREF
V
CC
Regulator
The V
CC
regulator accepts an input voltage in the range of 12V to 95V from the VIN pin and delivers a 6.5V
typical constant voltage at the VCC pin to provide power and bias voltages to the internal circuits. The VCC pin
should be bypassed to ground by a low ESR capacitor across the VCC and GND pins. A 1uF 10V X7R capacitor
is suggested.
The output current of the VCC regulator is limited to 20 mA which includes the biasing currents to the internal
circuit. When using the VCC regulator to bias external circuits, it is suggested to sink no more than 10 mA from
the VCC regulator to prevent over-heating of the device.
VREF Regulator
The VREF regulator is used to provide precision reference voltage to internal circuits and the IOUTADJ pin.
Other than providing bias voltage to the IOUTADJ pin, the VREF pin should not be used to provide power to
external circuit. The VREF pin must be bypassed to ground by a low ESR capacitor across the VREF and
RETRTN pins. A 0.47uF 10V X7R capacitor is suggested.
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