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NCV8660C

Very Low Iq LD0 150 mA Regulator with RESET and Delay Time Select

ON Semiconductor 

NCV8660C

DETAILED OPERATING DESCRIPTION

General

The NCV8660C is a 5 V linear regulator providing low

drop−out voltage for 150 mA at low quiescent current levels.

Also featured in this part is a reset output with selectable

delay times. Delay times are selectable via part selection and

control through the Delay Time Select (DT) pin. No pull−up

resistor is needed on the reset output (RO). Pull−up and

pull−down capability are included. Only a small bypass

capacitor on the input (IN) supply pin and output (OUT)

voltage pin are required for normal operation. Thermal

shutdown functionality protects the IC from damage caused

from excessively high temperatures appearing on the IC.

Output Voltage

Output stability is determined by the capacitor selected

from OUT to GND. The NCV8660C has been designed to

work with low ESR (equivalent series resistance) ceramic

capacitors. The device is extremely stable using virtually

any capacitor 2.2 mF and above. Reference the Output

Capacitor Stability graph in Figure 16.

The output capacitor value will affect overshoot during

power−up. A lower value capacitor will cause higher

overshoot on the output. System evaluation should be

performed with minimum loading for evaluation of

overshoot.

Selection of process technology for the NCV8660C

allows for low quiescent current independent of loading.

Quiescent current will remain flat across the entire range of

loads providing a low quiescent current condition in standby

and under heavy loads. This is highly beneficial to systems

requiring microprocessor interrupts during standby mode as

duty cycle and load changes have no impact on the standby

current. Reference Figure 11 for Quiescent Current vs

Output Current.

Current Limit

Current limit is provided on OUT to protect the IC. The

minimum specification is 205 mA. Current limit is specified

under two conditions (OUT = 96% x OUT nominal) and

(OUT = 0 V). No fold−back circuitry exists. Any measured

differences can be attributed to change in die temperature.

The part may be operated up to 205 mA provided thermal die

temperature is considered and is kept below 150°C.

Degradation of electrical parameters at this current is

expected at these elevated levels. A reset (RO) will not occur

with a load less than 205 mA.

Reset Output

A reset signal is provided on the Reset Output (RO) pin to

provide feedback to the microprocessor of an out of

regulation condition. This is in the form of a logic signal on

RO. Output (OUT) voltage conditions below the RESET

threshold cause RO to go low. The RO integrity is

maintained down to OUT = 1.0 V.

The Reset Output (RO) circuitry includes an active

internal pullup to the output (OUT) as shown in Figure 18.

No external pullup is neccessary.

OUT

RO

Reset

Control

Signal

Figure 18. Reset Output Circuitry

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