NCV59151DS30R4G データシートの表示（PDF） - ON Semiconductor

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NCV59151DS30R4G

1.5 A, Very Low-Dropout (VLDO) Fast Transient Response Regulator Series

ON Semiconductor 

NCP59150, NCV59150 Series

TYPICAL CHARACTERISTICS

Figure 21. Line Transient Response

Figure 22. Load Transient Response

APPLICATIONS INFORMATION

Output Capacitor and Stability

The NCP59150 series requires an output capacitor for

stable operation. The NCP59150 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 NCP59150 regulator is specified between finite

loads. A 5 mA minimum load current is necessary for proper

operation.

Error Flag

Some NCP59150 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

sink up to 5 mA typically during a VOUT fault condition.

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 NCP59150 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

up to VIN.

Overcurrent and Reverse Output Current Protection

The NCP59150 regulator is fully protected from damage

due to output current overload and output short conditions.

When NCP59150 output is overloaded, Output Current

limiting is provided. This limiting is linear; output current

during overload or output short 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 NCP59150 device when

the die temperature exceeds the maximum safe operating

temperature.

When NCP59150 is disabled and (VOUT – VIN) voltage

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

Fixed Voltage devices (30 mA typically at nominal output

voltage) needs to be included in the backup battery

discharging calculations.

Adjustable Voltage Design

The NCP/NCV59152 Adjustable voltage Device Output

voltage is set by the ratio of two external resistors as shown

in Figure 23.

The device maintains the voltage at the ADJ pin at 1.24 V

referenced to ground. The current in R2 is then equal to

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