参数资料
型号: AS3658F-BCTP
厂商: ams
文件页数: 48/158页
文件大小: 0K
描述: IC PMU POWER/AUDIO 124-CTBGA
标准包装: 2,500
应用: 便携式设备
电流 - 电源: 7mA
电源电压: 3 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 124-TFBGA
供应商设备封装: 124-CTBGA(8x8)
包装: 带卷 (TR)
AS3658
Data Sheet Confidential
- Detailed Description-Power Management Functions
Table 38. Charger External Components
Symbol
C VSUPPLY
Component
Minimum total
capacitance parallel to
Vsupply
Value
22μF± 20%, X5R or X7R dielectric
47μF± 20%, X5R or X7R dielectric
Note
10 μH inductor
22 μH inductor
Figure 17. Step down charger Efficiency (Measured) VSupply=4.4V
Step down charger
100
90
80
70
60
50
40
30
20
10
0
Vcharger=5V, f=550kHz
Vcharger=6V, f=550kHz
Vcharger=12V, f=550kHz
Vcharger=5V, f=275kHz
Vcharger=6V, f=275kHz
Vcharger=12V, f=275kHz
0,0000
0,2000
0,4000
0,6000
0,8000
1,0000
1,2000
Output current (A)
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 V chlimit .
In step down charger mode, If the V BAT voltage exceeds ResVoltRise, the internal battery switch is switched on, the
Vsupply voltage drops down to V BAT 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 V chlimit , if the V BAT 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 V chlimit .
If isolate_battery = 0 and EOC the output is not allowed to drop below V EOC (3.6V).
Table 39. Step down Charger parameters
Symbol
V rsense_max
C out_10
Parameter
Current limit voltage at
Rsense
Output capacitor with 10μH
inductor
Min
70
20
Typ
100
Max
130
60
Unit
mV
μF
Note
e.g.: 1.4A for 0.07O sense
resistor typ.
X7R ceramic
www.austriamicrosystems.com
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