ZXCP330 View Datasheet(PDF) - Zetex => Diodes

Part Name

Description

Manufacturer

ZXCP330

SWITCHED CAPACITOR DC-DC CONVERTER

Zetex => Diodes 

ZXCP330

TYPICAL APPLICATIONS

Low quiescent current, regulated operation

Low noise 3V supply

By pulsing the enable pin (pin 3) lower quiescent

operating current can be achieved while maintaining

output voltage regulation. A pulse frequency of 100Hz

with a 2% duty cycle is a suitable to achieve a 10␮A

operating current.

By adding the ZXCL300 3V regulator to the output of

the ZXCP330, the output voltage ripple can be

eliminated.

LED driver

Below is a typical LED driving application for a cell

phone. The ZXCP330 drives a coloured LED with a

typical forward voltage of 2.5V from a single Li-on

battery input. The LEDs can be driven in parallel to

provide backlighting for LCD displays and keypad

illumination. The LED current is regulated by R1 and is

configured for 20mA.

A typical waveform of the reduction in noise is shown

below.

Channel 1: VOUT ZXCP330 @20mV/DIV

Channel 2: VOUT ZXCL300 @20mV/DIV

VIN=4.4V; IOUT=40mA; Time base=2␮s/DIV

PROVISIONAL ISSUE A - DECEMBER 2001

7

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