ISL6414IRZ-TK datasheet(11/12 Pages) INTERSIL

Part #	ISL6414IRZ-TK

Description	Triple Output, Low-Noise LDO Regulator with Integrated Reset Circuit

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Manufacturer	INTERSIL [Intersil Corporation]

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11

50m

Ω or less to insure stability and optimum transient

response. For stable operation, a ceramic capacitor whose

value is minimum 3.3µF is recommended for VOUT1 for

300mA output current and 2.2µF is recommended for VOUT2

and VOUT3 each at 200mA load current. There is no upper

limit to the output capacitor value. Larger capacitor can

reduce noise and improve load transient response, stability

and PSRR. The output capacitor should be located very close

to VOUT pins to minimize impact of PC board inductances and

should be returned to a clean analog ground.

Input-Output (Dropout) Voltage

A regulator’s minimum input-output voltage differential (or

dropout voltage) determines the lowest usable supply voltage.

In battery-powered systems, this determines the useful end-

of-life battery voltage. Because the ISL6414 uses a P-channel

MOSFET pass transistor, its dropout voltage is a function of

rDS(ON) (typically 0.5) multiplied by the load current.

Noise, PSSR and Transient Response

The ISL6414 is designed to operate with low dropout

voltages and low quiescent current while still maintaining

good noise, transient response, and AC rejection. When

operating from noisy sources, improved supply-noise

rejection and transient response can be achieved by

increasing the values of the input and output bypass

capacitors and through passive filtering techniques.

The ISL6414 load transient response graph is presented in

application note AN1080. Increasing the output capacitor

value and decreasing the ESR attenuates the overshoot.

ISL6414

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