NCV4276B ONSEMI [ON Semiconductor], NCV4276B Datasheet - Page 7

• Manufacturer Part Number: NCV4276B
• Description: 400 mA Low-Drop Voltage Regulator
• Manufacturer: ONSEMI [ON Semiconductor]

Setting the Output Voltage
20 V. This is accomplished with an external resistor divider
feeding back the voltage to the IC back to the error
amplifier by the voltage adjust pin VA. The internal
reference voltage is set to a temperature stable reference of
2.5 V.
formula. Ignoring the bias current into the VA pin:
The output voltage range can be set between 2.5 V and
The output voltage is calculated from the following
V Q + [(R1 ) R2) * V ref ] R2
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7
due to VA bias current.
an output voltage of 2.5 V.
during the design phase.
adjustable version is between (V
Internal bias requirements dictate a minimum input voltage
of 4.5 V. The dropout voltage for output voltages less than
4.0 V is (4.5 V − V
Use R2 < 50 k to avoid significant voltage output errors
Connecting VA directly to Q without R1 and R2 creates
Designers should consider the tolerance of R1 and R2
The input voltage range for operation (pin 1) of the
Q
).
Q
+ 0.5 V) and 40 V.