參數(shù)資料
型號(hào)： ADP3522
廠商： Analog Devices, Inc.
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： GSM Power Management System
中文描述： 手機(jī)電源管理系統(tǒng)
文件頁(yè)數(shù)： 17/20頁(yè)
文件大小： 467K
代理商： ADP3522
REV. 0
ADP3522
–17–
1.75
20
40
1.25
2.00
60
80
0
1.50
0.75
0.25
1.00
0.50
0
100
120
V
TIME – Minutes
CHARGE CHARACTERISTIC
Figure 7.
Kanebo PAS621 Charge Characteristic
1.75
20
40
1.25
2.00
60
80
0
1.50
0.75
0.25
1.00
0.50
0
100
120
V
TIME – Minutes
CHARGER CHARACTERISTIC
Figure 8.
Panasonic EECEM0E204A Charge Characteristic
1.9
5
10
1.7
2.0
15
20
0
TIME – Hours
V
1.8
1.5
1.3
1.6
1.4
0.9
25
30
1.2
1.0
1.1
CHARGE CHARACTERISTIC
Figure 9.
Maxell TC614 Charge Characteristic
1.9
5
10
1.7
2.0
15
20
0
TIME – Hours
V
1.8
1.5
1.3
1.6
1.4
0.9
25
30
1.2
1.0
1.1
35
40
CHARGER CHARACTERISTIC
Figure 10.
Seiko TS621 Charge Characteristic
RTC Backup Coin Cell Selection
The choice of the backup cell is based upon size, cost, and
capacity. It must be able to support the RTC module’s current
requirement and voltage range, as well as handle the charge
current supplied by the ADP3522 (see TPC 2). Check with the
coin cell vendor if the ADP3522’s charge current profile is
acceptable.
Some suitable coin cells are the electric double layer capacitors
available from Kanebo (PAS621), Seiko (XC621), or Panasonic
(EECEM0E204A). They have a small physical size (6.8 mm
diameter) and a nominal capacity of 0.2 F to 0.3 F, giving hours
of backup time. Rechargeable lithium coin cells, such as the
TC614 from Maxell or the TS621 from Seiko, are also small in
size but have higher capacity than the double layer capacitors,
resulting in longer backup times. Typical charge curves for each
cell type are shown in Figures 7 through 10. Note that the
rechargeable lithium type coin cells generally come precharged
from the vendor.
RESET Capacitor Selection
RESET
is held low at power up. An internal power-good signal
starts the reset delay when the core LDO is up. The delay is set
by an external capacitor on RESCAP:
t
ms
nF
C
RESET
RESCAP
=
×
1 2
(4)
A 100 nF capacitor will produce a 120 ms reset delay. The
current capability of
RESET
is minimal (a few hundred nA)
when VCORE is off to minimize power consumption. When
VCORE is on,
RESET
is capable of driving 500
μ
A.
Setting the Charge Current
The ADP3522 is capable of charging both lithium ion and
NiMH batteries. For NiMH batteries, the charge current is
limited by the adapter. For lithium ion batteries, the charge
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