参数资料
型号: AS3658D-BCTP
厂商: ams
文件页数: 22/158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
Figure 7. DC/DC step up converter 1 with regulated output voltage (15V), and switch off function of output
voltage, to reduce shutdown current
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As the output voltage is always on, an additional output transistor can be added to reduce shutdown current through
R1, R2 and the connected output circuit.
Note: A similar circuit can be used for step up converter 2.
8.1.2 StepUp1 Load Detection and Overcurrent Protection Circuit
This circuit protects the DCDC step up1 converter during short circuit and startup, by regulation of the output current.
An additional feature is the detection of a minimum output load of the Step-up converter. It is also possible to use this
circuit without the DCDC step up converter, by using the sense resistor only:
Detection circuit: If the voltage on R sense exceeds V DETECT for more than 1msecond, or the DCDC Step up
converter is not in Pulseskip for more than 1 millisecond, the stepup1_det bit will be set.
Overcurrent protection: If the Overcurrent voltage V OVCURRENT has been exceeded by more than 5 msec the Bit
stpup1_oc will be set and can only reset, by switching off and on the Protection circuit by writing Stpup1_shortprot
0 – 1. If stepup1_oc is set the load will be disconnected, if Stpup1_oc_timeout=1
Table 7. StepUp1 protection/detection circuit parameters
Symbol
V DETECT
V OVCURRENT
Parameter
Detection Threshold
Overcurrent Threshold
rising
Min
2
150
Typ
12.5
180
Max
25
215
Unit
mV
mV
Note
For Rsense=0.150 Ω =>
83mA typ.
For Rsense=0.150 Ω =>
1.2A typ.
V OVhysteresis
Overcurrent Hysteresis
50
mV
Interrupt and/or external PMOS
t OV_timeout
Overcurrent timeout
5
ms
switching off after timeout
f clk_int = 2.2MHz
t detect
Detection denounce
time
1
ms
f clk_int = 2.2MHz
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