PCA5007 datasheet(58/112 Pages) PHILIPS

58 / 112 page

1998 Oct 07

Philips Semiconductors

Product speciﬁcation

Pager baseband controller

PCA5007

6.22

DC/DC converter

6.22.1

FUNCTION

The DC/DC converter converts the voltage from a single

primary cell (0.9 to 1.6 V) to a nominal 2.2 V supply

voltage for on-chip and off-chip use. For EMC reasons a

special technique is used to minimize coil current ripples

under all load conditions.

The voltage generated by the DC/DC converter is

available at pin VDD(DC). The supply for all functions of the

chip is taken from the VDD and VDDA pins. The user has to

connect VDD(DC) to the other VDD pins. The supply used for

the reference and comparators is taken from VDDA.

A typical circuit configuration is shown in Fig.29.

For a certain current load (IL) the controller settles to a

stable voltage VDD (IL) between 2.15 to 2.25 V. Increasing

the load decreases VDD (IL) by a small amount. When

VDD (IL) drops below 2.15 V the DC/DC converter

calculates a new set of coefficients and VDD (IL) settles

again between 2.15 and 2.25 V (see Fig.38).

Fig.29 Typical operating circuit.

handbook, full pagewidth

MGR132

VIND

VDD(DC)

2.25 V

2.15 V

DIGITAL

CONTROL

6 MHz

MICROCONTROLLER

VSS, VSSA

RESETIN

VBAT

BAND GAP

BLI

4.7

µF

4.7

µF

VBAT

0.9

1.6 V

VDD

VDDA

470

µH

PCA5007

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