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| 型号： | MAX8688ALETG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/38页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY CTRLR/MONTR 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 应用： | 电源控制器/监控器 |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 6.7mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 管件 |
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Digital Power-Supply Controller/Monitor
with PMBus Interface
t ON_DELAY
t OFF_DELAY
t PMB_RSP
t ON_RISE
t PMB_RSP
t OFF_FALL
ENOUT
CLOSE S1
OPEN S1
DAC
OUTPUT
POL
V OUT
HIGH-
IMPEDANCE
t POL_RISE
t POL_FALL
HIGH-
IMPEDANCE
POL
OPERATION
TURN-ON
TURN-OFF
IN FB MODE, t POL_RISE AND t POL_FALL ARE NOT CONTROLLED BY THE MAX8688 AND ARE DEPENDENT ON POL IMPLEMENTATION.
Figure 6. Feedback Mode Timing
Current Sensing
ISN+ and ISN- are the inputs of the MAX8688 current-
sense amplifier. These pins may be connected to a cur-
rent-sense element such as a current-sense resistor, as
shown in Figures 3 and 5. The voltage proportional to
the sensed current is suitably filtered by an internal
200 ? resistor and external capacitor connected to
ISN_C and is multiplexed to a 12-bit ADC that uses an
accurate internal reference voltage. A scale factor can
be programmed with an IOUT_SCALE PMBus com-
mand to translate the sensed voltage information to the
current. The MAX8688 accommodates a current-sense
range of +40mV/-10mV across the ISN+ and ISN-
inputs. The common-mode voltage range for the cur-
rent-sense signal can be between 0 and 5.5V. When a
negative current is sensed by the MAX8688, FLT is
asserted indicating a negative fault current flow into the
POL output.
The DC resistance of the output inductor (DCR) in a
switch-mode power supply can also function as a current-
sense element, as shown in Figure 7. The RC filter formed
by R S and C S is designed with a time constant of about 10
times larger than the Lo/DCR time constant. Under these
conditions, the DC voltage across C S is equal to the prod-
uct of the average current flowing through the output
inductor, essentially the output load current and the DCR.
The resistor R BIAS equal to R S is placed in the current-
sensing path as shown, to cancel the effect of the input
bias current voltage drop across R S .
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8688ALETG/GH9 | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX8688ALETG/GH9-T | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX8688ALETG+ | 功能描述:电流和电力监控器、调节器 Digital Power-Supply Controller/Monitor RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX8688ALETG+T | 功能描述:电流和电力监控器、调节器 Digital Power-Supply Controller/Monitor RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX8688BHETG+ | 功能描述:电流和电力监控器、调节器 Digital Power-Supply Controller/Monitor RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
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