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AS3658 датащи(PDF) 48 Page - ams AG

номер детали AS3658
подробное описание детали  Power and Audio Management Unit for Portable Devices
PDF  158 Pages
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производитель  AMSCO [ams AG]
домашняя страница  http://www.ams.com
Logo AMSCO - ams AG

AS3658 датащи(HTML) 48 Page - ams AG

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www.austriamicrosystems.com
Revision 1v13
47 - 157
AS3658
Data Sheet Confidential - Detail ed Descri ption-Power Management Functions
Figure 17. Step down charger Efficiency (Measured) VSupply=4.4V
8.7.1 External Step Down/Linear Charger Characteristics
The battery charge controller controls the external Step Down/ Linear charger.
During Trickle charge of the deeply discharged battery the step down/Linear converter regulates the Vsupply to Vchlimit.
In step down charger mode, If the VBAT voltage exceeds ResVoltRise, the internal battery switch is switched on, the
Vsupply voltage drops down to VBAT immediately, and the step down converter operates as controlled current source
to Vsupply. The battery current is regulated to the value defined in ConstantCurrent register.
In linear charger mode, the Vsupply is still regulated to Vchlimit, if the VBAT voltage exceeds ResVoltRise. The current is
regulated by the battery switch to the value defined in the constant current register.
In EOC operation (see Battery Charge Controller on page 51), the operation of the charger depends on the bit
isolate_battery:
If isolate_battery = 1 and EOC the output is regulated to Vchlimit.
If isolate_battery = 0 and EOC the output is not allowed to drop below VEOC (3.6V).
CVSUPPLY
Minimum total
capacitance parallel to
Vsupply
22µF± 20%, X5R or X7R dielectric
10 µH inductor
47µF± 20%, X5R or X7R dielectric
22 µH inductor
Table 39. Step down Charger parameters
Symbol
Parameter
Min
Typ
Max
Unit
Note
Vrsense_max
Current limit voltage at
Rsense
70
100
130
mV
e.g.: 1.4A for 0.07O sense
resistor typ.
Cout_10
Output capacitor with 10µH
inductor
20
60
µF
X7R ceramic
Table 38. Charger External Components
Symbol
Component
Value
Note
Step down charger
0
10
20
30
40
50
60
70
80
90
100
0,0000
0,2000
0,4000
0,6000
0,8000
1,0000
1,2000
Output current (A)
Vcharger=5V, f=550kHz
Vcharger=6V, f=550kHz
Vcharger=12V, f=550kHz
Vcharger=5V, f=275kHz
Vcharger=6V, f=275kHz
Vcharger=12V, f=275kHz



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