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| 型号： | MC33997 |
| 厂商： | 飞思卡尔半导体(中国)有限公司 |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | Switching Power Supply with Linear Regulators(带线性稳压器的开关电源) |
| 中文描述： | 开关电源与线性稳压器（带线性稳压器的开关电源） |
| 文件页数： | 14/20页 |
| 文件大小： | 454K |
| 代理商： | MC33997 |
33997
14
Go to: www.freescale.com
Power-On Reset Timer
This timer starts to time out at the end of the soft-start period
if the V
DDH
and V
DDL
outputs are in the valid regulation range.
If the timer “times out”, then the open-drain PWROK signal is
released, indicating that “power is ON”.
Supervisory Circuits PWROK and VKAMOK
The 33997 has two voltage monitoring open-drain outputs,
the PWROK and the VKAMOK pins. PWROK is "active high".
This output is pulled low when either of the regulator outputs
(V
DDH
or V
DDL
) are below their regulation windows. If both
regulator outputs are above their respective lower thresholds,
and the Power-On Reset Timer has expired, the output driver is
turned off and this pin is at high-impedance state (see
Figure 6
).
The VKAMOK signal indicates a severe fault condition on
the keep-alive regulator output V
KAM
. The V
KAM
output voltage
is compared to the internal bandgap reference voltage. When
the V
KAM
falls below the bandgap reference voltage level, the
VKAMOK signal is pulled low.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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| MC33997DW | 功能描述:IC SWITCH 3.3/5V SUPPLY 24-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| MC33997DWR2 | 制造商:Rochester Electronics LLC 功能描述:MLPS 3.3 IC - Bulk |
| MC33999EK | 功能描述:多路器开关 IC 16 LOW SIDE PWM&SPI RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MC33999EK | 制造商:Freescale Semiconductor 功能描述:IC SWITCH 16 OUT SPI/PWM 54SOIC |
| MC33999EKR2 | 功能描述:多路器开关 IC 16 LOW SIDE PWM&SPI RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
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