ZLDO330 查看數據表（PDF） - Zetex => Diodes

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ZLDO330

3.3 VOLT ULTRA LOW DROPOUT REGULATOR

Zetex => Diodes 

ZLDO330

NOTES.

1. Maximum power dissipation of the device is calculated assuming the package is mounted on a PCB

measuring 2 inches square.

2 Output voltage temperature coefficient is calculated as:-

VO change x 1000000

VO x temperature change

3. Dropout voltage is defined as the input to output voltage differential at which the circuit ceases to

regulate. The value is measured when the output voltage has dropped by 100mV from Vout measured

at the nominal input Vin = Vout + 1V

4. Guaranteed by design.

FUNCTIONAL DESCRIPTION

The ZLDO is a high performance, ultra low dropout, low quiescent regulator. Available in SM8 surface

mount packaging, the device is able to dissipate 2W(note 1) allowing complete design flexibility with

an input span upto 20V and 300mA output current. The device quiescent is 1mA (typ) at 300mA load

current. A low battery comparator signifies impending battery failure, whilst a shutdown function

reduces quiescent current to a mere 11µA (typ). A precision bandgap reference gives ± 2.5% output

tolerance and good temperature characteristics over the range -40 to +85°C. AC performance is

enhanced via the use of a small external capacitor.

PIN DEFINITIONS

Pin 1 LBF - Low Battery Flag. An open collector

NPN output which pulls low on failing input

supply.

Pin 2 SC - Shutdown Control. This high

impedance logic compatible input disables the

regulator when taken high. It includes a diode

wired to Vin and so will pass current if taken more

than 0.5V above Vin.

Pin 3 Vin - Voltage Input. The power supply to

the regulator. The permissible input voltage

range is -0.3 to 20V. An input capacitor is not

mandatory but will be useful in reducing the

coupling of noise from input to output and

minimising the effect of sudden changes in load

current on the input voltage.

Pin 4 N/C - Not Connected. Not internally

connected and so can be left open or wired to

any pin without affecting the performance of the

regulator.

Pin 5 Vout - Voltage Output. The output of the

regulator. An output capacitor of 1uF or greater

and having low ESR should be wired in close

proximity to the regulator to ensure stability for

all loads.

Pin 6 D/C - Do Not Connect. This pin is wired to

an internal circuit node of the regulator. No

external connection should be made to this pin.

Pin 7 Gnd - Ground. The ground connection of

the regulator against which the output voltage is

referenced.

Pin 8 Spg - Shaping. The shaping node for

the error amplifier of the regulator. A capacitor

of 10pF wired from this pin to the output pin

(pin 5) gives optimum stability. Improved AC

can be achieved by reducing the value of this

capacitor but stability may be impaired for

some load conditions.

4-64

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