NCP59300, NCV59300 Series

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APPLICATIONS INFORMATION

Output Capacitor and Stability

The NCP59300 series requires an output capacitor for

stable operation. The NCP59300 series is designed to

operate with ceramic output capacitors. The recommended

output capacitance value is 47

mF or greater. Such capacitors

help to improve transient response and noise reduction at

high frequency.

Input Capacitor

An input capacitor of 1.0

mF or greater is recommended

when the device is more than 4 inches away from the bulk

supply capacitance, or when the supply is a battery. Small,

surface−mount chip capacitors can be used for the

bypassing. The capacitor should be place within 1 inch of

the device for optimal performance. Larger values will help

to improve ripple rejection by bypassing the input of the

regulator, further improving the integrity of the output

voltage.

Minimum Load Current

The NCP59300 regulator is specified between finite

loads. A 10 mA minimum load current is necessary for

proper operation.

Error Flag

Some NCP59300 series members feature an error flag

circuit that monitors the output voltage and signals an error

condition when the voltage is 5% below the nominal output

voltage. The error flag is an open−collector output that can

The FLG output is overload protected when a short circuit

of the pullup load resistor occurs in the application. This is

guaranteed in the full range of FLG output voltage Max

ratings (see Max Ratings table). Please be aware operation in

this mode is not recommended, power dissipated in the device

can impact on output voltage precision and other device

characteristics.

Enable Input

Some NCP59300 series members also feature an enable

input for on/off control of the device. It’s shutdown state

draws “zero” current from input voltage supply (only

microamperes of leakage). The enable input is TTL/CMOS

compatible for simple logic interface, but can be connected

Overcurrent and Reverse Output Current Protection

The NCP59300 regulator is fully protected from damage

due to output current overload conditions. When NCP59300

output is overloaded, Output Current limiting is provided.

This limiting is linear; output current during overload

conditions is constant. These features are advantageous for

powering FPGAs and other ICs having current consumption

higher than nominal during their startup.

Thermal shutdown disables the NCP59300 device when

the die temperature exceeds the maximum safe operating

temperature.

difference is less than 6.5 V in the application, the output

structure of these regulators is able to withstand output

voltage (backup battery as example) to be applied without

reverse current flow. Of course the additional current

flowing through the Feedback resistor divider inside the

NCP59300 Fixed voltage devices (30

mA typically at

nominal output voltage) needs to be included in the backup

battery discharging calculations.

Thermal Considerations

The power handling capability of the device is limited by

total power dissipated by the device has two components,

Input to output voltage differential multiplied by Output

current and Input voltage multiplied by GND pin current.

The GND pin current value can be found in Electrical

Characteristics table and in Typical Characteristics graphs.

(eq. 2)

Ambient Thermal Resistance of the NCP/NCV59300

device mounted on the specific PCB.

To maximize efficiency of the application and minimize

thermal power dissipation of the device it is convenient to

use the Input to output voltage differential as low as possible.

The static typical dropout characteristics for various

output voltage and output current can be found in the Typical

Characteristics graphs.