NCP133AMX180TCG datasheet(7/9 Pages) ONSEMI

Part #	NCP133AMX180TCG

Description	500 mA, Very Low Dropout Bias Rail CMOS Voltage Regulator

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP133

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APPLICATIONS INFORMATION

IN

EN

FB

LX

GND

Processor

I/O

BIAS

IN

OUT

GND

NCP133

LOAD

VBAT

1.5 V

1.0 V

To other circuits

I/O

EN

Figure 12. Typical Application: Low−Voltage DC/DC Post−Regulator with ON/OFF Functionality

Switch−mode DC/DC

VOUT = 1.5 V

The NCP133 dual−rail very low dropout voltage regulator

is using NMOS pass transistor for output voltage regulation

from VIN voltage. All the low current internal control

circuitry is powered from the VBIAS voltage.

The use of an NMOS pass transistor offers several

advantages in applications. Unlike PMOS topology devices,

the output capacitor has reduced impact on loop stability.

Vin to Vout operating voltage difference can be very low

compared with standard PMOS regulators in very low Vin

applications.

The NCP133 offers smooth monotonic start-up. The

controlled voltage rising limits the inrush current.

The Enable (EN) input is equipped with internal

hysteresis. NCP133 Voltage linear regulator Fixed and

Adjustable version is available.

Output Voltage Adjust

The required output voltage of Adjustable devices can be

adjusted from 0.8 V to 3.6 V using two external resistors.

Typical application schematics is shown in Figure 13.

BIAS

IN

OUT

GND

CBIAS

2.2 μF

CIN

NCP133 ADJ

VBIAS

VIN

EN

VEN

VOUT

ADJ

R1

R2

Figure 13. Typical Application Schematics

V

OUT + 0.8

1

) R1 R2

It is recommended to keep the total serial resistance of

resistors (R1 + R2) no greater than 100 k

W.

Recommended resistor values for programming the

frequently used voltages can be found in the Table 1.

Dropout Voltage

Because of two power supply inputs VIN and VBIAS and

one VOUT regulator output, there are two Dropout voltages

specified.

The first, the VIN Dropout voltage is the voltage

difference (VIN – VOUT) when VOUT starts to decrease by

percent specified in the Electrical Characteristics table.

VBIAS is high enough; specific value is published in the

Electrical Characteristics table.

The second, VBIAS dropout voltage is the voltage

difference (VBIAS – VOUT) when VIN and VBIAS pins are

joined together and VOUT starts to decrease.

Input and Output Capacitors

The device is designed to be stable for ceramic output

capacitors with Effective capacitance in the range from

2.2

mF to 10 mF. The device is also stable with multiple

capacitors in parallel, having the total effective capacitance

in the specified range.

In applications where no low input supplies impedance

available (PCB inductance in VIN and/or VBIAS inputs as

example), the recommended CIN = 1

mF and CBIAS = 0.1 mF

or greater. Ceramic capacitors are recommended. For the

best performance all the capacitors should be connected to

the NCP133 respective pins directly in the device PCB

copper layer, not through vias having not negligible

impedance.

When using small ceramic capacitor, their capacitance is

not constant but varies with applied DC biasing voltage,

temperature and tolerance. The effective capacitance can be

much lower than their nominal capacitance value, most

importantly in negative temperatures and higher LDO

output voltages. That is why the recommended Output

capacitor capacitance value is specified as Effective value in

the specific application conditions.

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