AIC1742 Просмотр технического описания (PDF) - Analog Intergrations

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AIC1742

Low Noise, Low Quiescent Current, 150mA Linear Regulator with Noise Bypass

Analog Intergrations 

AIC1742

DETAILED DESCRIPTION OF TECHNICAL TERMS

DROPOUT VOLTAGE (VDROP)

The dropout voltage is defined as the difference

between the input voltage and output voltage at

which the output voltage drops 100mV. Below

this value, the output voltage will fall as the input

voltage reduces. It depends on the load current

and junction temperature.

LINE REGULATION

Line regulation is the ability of the regulator to

maintain a constant output voltage as the input

voltage changes. The line regulation is specified

as the input voltage changes from VIN = VOUT +

1V to VIN = 8V and IOUT = 1mA.

LOAD REGULATION

Load regulation is the ability of the regulator to

maintain a constant output voltage as the load

current changes. A pulsed measurement with an

input voltage set to VIN = VOUT + VDROP can

minimize temperature effects. The load

regulation is specified by the output current

ranging from 0.1mA to 150mA.

QUIESCENT CURRENT (IQ)

Quiescent current is the current flowing through

ground pin with no output load.

GROUND CURRENT (IGND)

Ground current is the current flowing through the

ground pin with output load.

STANDBY CURRENT (ISTBY)

Standby current is the current flowing into the

regulator when the output is shutdown by setting

V SHDN at 0V and VIN at 8 V.

CURRENT LIMIT (IIL)

Current limiting of AIC1742 monitors and controls

the maximum output current, in case of a shorted

output. It protects device from the damage

resulting from any unexpected current.

RIPPLE REJECTION (RR)

Ripple rejection is the ability of the regulator to

reduce voltage ripple, which comes from input, at

output terminal. It is specified with a signal of

0.5VP-P at 1KHz frequency applying to input,

output capacitor at 2.2µF as well as a noise

bypass of 0.1µF. Ripple rejection, expressed in

dB, is the ratio of output ripple to input.

THERMAL PROTECTION

Thermal sensor protects device when the

junction temperature exceeds TJ= +155ºC. It

signals shutdown logic, turning off pass transistor

and allowing IC to cool down. After the IC’s

junction temperature cools by 15ºC, the thermal

sensor will turn the pass transistor back on.

Thermal protection is designed to protect the

device in the event of fault conditions. For a

continuous operation, do not exceed the absolute

maximum junction-temperature rating of TJ=

150ºC, or damage may occur to the device.

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