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ILC7080AIM5 Scheda tecnica(PDF) 5 Page - Fairchild Semiconductor

Il numero della parte ILC7080AIM5
Spiegazioni elettronici  50/100mA SOT-23 CMOS RF LDO Regulators
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

ILC7080AIM5 Scheda tecnica(HTML) 5 Page - Fairchild Semiconductor

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ILC7080/81
REV. 1.0.7 4/3/03
5
Figure 2. ILC7080/81 RF LDO regulator block diagram
ON/OFF
GND
V
OUT
V
IN
C
NOISE
FEEDBACK
BANDGAP
REFERENCE
V
REF
ERROR
AMPLIFIER
TRANS-
CONDUCTANCE
AMPLIFIER
INTERNAL V
DD
Shutdown (ON/OFF) Operation
The ILC7080/81 output can be turned off by applying 0.4V
or less to the device’s ON/OFF pin (pin 3). In shutdown
mode, the ILC7080/81 draws less than 1µA quiescent cur-
rent. The output of the ILC7081 is enabled by applying 2V to
13V at the ON/OFF pin. In applications where the ILC7080/
81 output will always remain enabled, the ON/OFF pin may
be connected to VIN (pin 1). The ILC7080/81’s shutdown
circuitry includes hysteresis, as such the device will operate
properly even if a slow moving signal is applied to the ON/
OFF pin.
Short Circuit Protection
The ILC7080/81 output can withstand momentary short
circuit to ground. Moreover, the regulator can deliver very
high output peak current due to its 1A instantaneous short
circuit current capability.
Thermal Protection
The ILC7080/81 also includes a thermal protection circuit
which shuts down the regulator when die temperature
exceeds 150˚C due to overheating. In thermal shutdown,
once the die temperature cools to below 140˚C, the regulator
is enabled. If the die temperature is excessive due to high
package power dissipation, the regulator’s thermal circuit
will continue to pulse the regulator on and off. This is called
thermal cycling.
Excessively high die temperature may occur due to high
differential voltage across the regulator or high load current
or high ambient temperature or a combination of all three.
Thermal protection protects the regulator from such fault
conditions and is a necessary requirement in today’s designs.
In normal operation, the die temperature should be limited to
under 150˚C.
Adjustable Output Voltage
Figure 3 shows how an adjustable output voltage can be
easily achieved using ILC7081-ADJ. The output voltage,
VOUT is given by the following equation:
VOUT = 1.24V x (R1/R2 + 1)
Figure 3. Application circuit for adjustable output voltage
For best results, a resistor value of 470k
Ω or less may be
used for R2. The output voltage can be programmed from
2.5V to 12V.
Note:
An external capacitor should not be connected to the
adjustable feedback pin (pin 4). Connecting an external
capacitor to pin 4 may cause regulator instability and lead to
oscillations.
ILC7081-ADJ
V
OUT
V
IN
C
OUT
R1
SOT23-5
C
IN
ON
OFF
12
3
4
5
V
ADJ
R2


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