PCA5010 datasheet(63/112 Pages) PHILIPS

63 / 112 page

1998 Nov 02

Philips Semiconductors

Product speciﬁcation

Pager baseband controller

PCA5010

6.22.2

TYPICAL OPERATING CHARACTERISTICS

The maximum power delivered by the DC/DC converter is

given by equation (1).

(1)

Rs is the total series resistance which is the sum of

RBAT +Rind +Rsw + ESR(Co). In Figs 37 and 38 the

maximum available output current IL is shown as a function

of VBAT and Rs.

o(max)

BAT

()

⋅

-------------------

≤

The efficiency is determined by the series resistance RS

and the current consumption of the converter itself. RS is

the sum of the battery resistance RBAT, the DC resistance

SRL of the coil, the on resistance of the MOSFET RDS,on

and the ESR of the output capacitor Co. Figure 39a shows

the efficiency when using a 470

µH coil with a SRL of 5 Ω

and a load capacitor of 4.7

µF with an ESR of 0.5 Ω. In

Fig.39b the efficiency for the same configuration is shown

but with a SRL of only 0.1

Ω. To increase efficiency for

extremely low output currents, the converter should be set

into standby mode (see Fig.40).

Fig.37 Maximum available output current (mA) in normal mode.

handbook, full pagewidth

MGR345

0.8

1.2

1.6

1.4

VBAT (V)

(

Ω)

100

VDD = 2.2 V; RS =RBAT +Rind +Rsw.

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