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参数资料
| 型号： | MAX8688ALETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/38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： | 2,500 |
| 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： | 带卷 (TR) |
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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
DAC
OUTPUT
POL
V OUT
POL
OPERATION
Figure 4. REFIN Mode Timing
TURN-ON
TURN-OFF
Feedback (FB) Mode
In applications where a REFIN input is not available, the
MAX8688 interfaces to the inverting input of the POL
error amplifier, the feedback node (FB), through a
resistor R FB as shown in Figure 5. In steady-state oper-
ation, the MAX8688 controls the POL voltage as mea-
sured between RS+ and RS- to 0.2% accuracy over
line, load, and temperature variations, by adjusting
DACOUT 1 LSB (0.5mV) at a time, up and down as
required. This mode of operation is termed FB mode.
Since the MAX8688 does not have control over the POL
error-amplifier reference voltage, this mode relies on
the POL soft-start setting to implement the required
soft-start time. On receipt of either an OPERATION ON
command or a turn-on signal from A3/ONOFF, the
MAX8688 commences startup operations that have
been programmed for the POL being controlled. After
the programmed t ON_DELAY time, the MAX8688 open-
drain ENOUT output goes active, causing the POL to
ramp up its output voltage to its target value. The soft-
start time taken by the POL to ramp from zero to its
commanded output voltage should be entered into the
MAX8688 with the t ON_RISE parameter.
During t ON_RISE , the MAX8688 maintains DACOUT in a
time, the internal DAC output is initialized to the external
voltage measured on DACOUT and switch S1 is closed.
If the POL has completed its soft-start and settled down
at its output voltage, the DAC output is initialized to the
steady-state value of the POL FB voltage. Therefore,
when switch S1 is closed, the voltages on either side of
the resistor R FB are equal. Under these conditions, zero
current flows into the FB node from DACOUT and no
perturbations are introduced to the output voltage. From
this point on, the MAX8688 adjusts the voltage at
DACOUT to provide accurate output voltage control. In
FB mode, the user is required to supply t ON_DELAY and
t ON_RISE parameters. If those parameters are not set
(the default values are zero), S1 closes prematurely and
cause an initial error in the voltage monitor.
On receipt of either an OPERATION OFF command or a
turn-off signal from A3/ONOFF, the MAX8688 com-
mences the shutdown operation that has been pro-
grammed for the POL being controlled. After the
programmed t OFF_DELAY time, the MAX8688 deasserts
its open-drain ENOUT output, and turns off the POL.
For the FB mode, the value of R FB is selected based on
following formula:
high-impedance state by keeping the S1 switch open.
This allows the voltage at DACOUT to equal that of the
FB node of the POL. At the end of the t ON_RISE delay
R FB = R 1 ×
? V DAC
? V O
12
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相关代理商/技术参数 |
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|---|---|
| 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 |
| MAX8688BHETG+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 |
| MAX8688BLETG+ | 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 |
| MAX8688BLETG+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 |
| MAX8688EVKIT+ | 功能描述:电流和电力监控器、调节器 DIGITAL POWER SUPPLY 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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