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bandgap and regulator

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alok_ky

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What is the difference between a voltage bandgap and a voltage regulator ???
 

v_c

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They both do produce a controlled voltage. A bandgap is a circuit (usually with temperature compensation) that is mostly used a constant stable reference voltage.

A regulator (for example a linear regulator) is a circuit which uses a series transistor as a variable resitor to regulate the voltage across a load. In order to provide a constant output a feedback loop is established usually comparing the output voltage (or a portion of the output voltage, using a resistive divider) to a known reference voltage (like a bandgap reference from above). So a bandgap is an integral part of the regulator system.

Best regards,
v_c
 

jc2

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Rout(regulator)<Rout(bandgap)
 

kenlino

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I agree with v_c.
"a bandgap is an integral part of the regulator system."
regulator can make bandgap's load characteristics more excellent.
 

surianova

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alok_ky said:
What is the difference between a voltage bandgap and a voltage regulator ???


Both provide DC output voltage but regulator has the capability to drive resistive load but bandgap cannot and bandgap only can drive capacitive load.
 

kwkam

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Bandgap is a kind of circuit to provide a temperature independene voltage reference.
Voltage regulator is a circuit to keep a node voltage constant. And usually it require a voltage reference.
 

afujian

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yes, in my opinion,bandgap can not drive a resistor load,for if the current through the output branch changed,the positive and negative TC will not counterbalance each other.
 

keith1200rs

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You can draw 'some' current from a bandgap reference - you need to check the specifications. Some 'shunt' bandgaps can be used as low power voltage regulators.

Keith
 

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