ISL6416IAZ データシートの表示（PDF） - Renesas Electronics

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ISL6416IAZ

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

Renesas Electronics 

ISL6416

Applications Information

Capacitor Selection and Regulator Stability

Capacitors are required at the ISL6416’s input and output for

stable operation over the entire load range and the full

temperature range. Use > 2.2µF capacitor at the input of

ISL6416. The input capacitor lowers the source impedance of

the input supply. Larger capacitor values and lower ESR

provides better PSRR and line transient response. The input

capacitor must be located as close as possible to the VIN pins of

the IC and returned to a clean analog ground. Any good quality

ceramic or tantalum can be used as an input capacitor.

The output capacitor must meet the requirements of minimum

amount of capacitance and ESR for all three LDO’s. The

ISL6416 is specifically designed to work with small ceramic

output capacitors. The output capacitor’s ESR affects stability

and output noise. Use an output capacitor with an ESR of 50m

or less to insure stability and optimum transient response. For

stable operation, a ceramic capacitor, with a minimum value of

3.3F, is recommended for VOUT1 for 300mA output current,

and 2.2F is recommended for VOUT2 and VOUT3 each at

200mA load current. There is no upper limit to the output

capacitor value. A larger capacitor can reduce noise and

improve load transient response, stability and PSRR. Higher

value of the output capacitor (10µF) is recommended for LDO3

when used to power VCO circuitry in wireless chipsets. The

output capacitor should be located very close to Vout pins to

minimize impact of PC board inductances and the other end of

the capacitor 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.

Because the ISL6416 uses a P-channel MOSFET pass

transistor, its dropout voltage is a function of rDS(ON) (typically

0.5) multiplied by the load current.

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modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets are

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subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or

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For information regarding Intersil Corporation and its products, see www.intersil.com

FN9193 Rev 0.00

Nov 3, 2004

Page 10 of 11

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