參數(shù)資料
型號: PCA5010
廠商: NXP Semiconductors N.V.
英文描述: Pager baseband controller
中文描述: 傳呼機基帶控制器
文件頁數(shù): 62/112頁
文件大?。?/td> 627K
代理商: PCA5010
1998 Nov 02
62
Philips Semiconductors
Product specification
Pager baseband controller
PCA5010
6.22
DC/DC converter
6.22.1
F
UNCTION
The DC/DC converter converts the voltage from a single
primary cell (0.9 to 1.6 V) to a nominal 2.2 V V
DD
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 V
DD(DC)
. The supply for all functions of the
chip is taken from the V
DD
and V
DDA
pins. The user has to
connect V
DD(DC)
to the other V
DD
pins. The supply used for
the reference and comparators is taken from V
DDA
.
A typical circuit configuration is shown in Fig.36.
For a certain current load (I
L
) the controller settles to a
stable voltage V
DD
(I
L
) in the window 2.15 to 2.25 V.
Increasing the load decreases V
DD
(I
L
) by a small amount.
When V
DD
(I
L
) drops below 2.15 V the DC/DC converter
calculates a new set of coefficients and V
DD
(I
L
) settles
again between 2.15 and 2.25 V (see Fig.45).
Fig.36 Typical operating circuit.
handbook, full pagewidth
MGL458
VIND
VDD(DC)
2.25 V
2.15 V
DIGITAL
CONTROL
D1
6 MHz
MICROCONTROLLER
VSS, VSSA
RESETIN
VBAT
BAND GAP
BLI
Ci
4.7
μ
F
Co
4.7
μ
F
VBAT
0.9
to
1.6 V
C1
R1
VDD
VDD
VDDA
L
470
μ
H
PCA5010
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