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| 型号： | MAX6791TPLD2+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/24页 |
| 文件大小： | 0K |
| 描述： | IC REG LIN W/SPR VSR 20-TQFN |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | 稳压器/监控器 |
| 监视电压数目： | 2 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 8.75 ms |
| 电压 - 阀值： | 4.625V，可调 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（5x5） |
| 包装： | 管件 |
High-Voltage, Micropower, Single/Dual Linear
Regulators with Supervisory Functions
watchdog re-enables immediately when any of these
conditions are removed (as long as the RESET is not
asserted). Note that the output current threshold limit
includes hysteresis so that output current must exceed
13.8mA (max) to reenable the watchdog timer.
Capacitor Selection and Regulator
Stability
For stable operation over the full temperature range
and with load currents up to 150mA, use a 10μF (min)
output capacitor with an ESR < 0.5 ? . To reduce noise
and improve load-transient response and power-supply
rejection, use larger output-capacitor values. Some
ceramic dielectrics exhibit large capacitance and ESR
variation with temperature. For these types of capaci-
tors (such as Z5U and Y5V), much higher-value capaci-
tors are required to maintain stability over the
temperaure range. With X7R dielectrics, a 10μF capaci-
tor should be sufficient at all operating temperatures.
V IN
IN
MAX6792
MAX6794
MAX6796
RESET
GND
Figure 4. Ensuring RESET Valid to V IN = 0V
To improve power-supply rejection and transient
response, increase the capacitor between IN and GND.
Ensuring a Valid RESET Output Down to
V IN = 0V
When V IN falls below 1V, RESET current-sinking capa-
bilities decline drastically. High-impedance CMOS-
R5
V IN
IN
V TERM
logic inputs connected to RESET can drift to
undetermined voltages. This presents no problems in
most applications, since most μPs and other circuitry
do not operate with a supply voltage below 1V. In those
applications where RESET must be valid down to 0V,
R6
PFI
MAX6791
GND
PFO
adding a pulldown resistor between RESET and GND
sinks any stray leakage currents, holding RESET low
(Figure 4). The value of the pulldown resistor is not criti-
cal; 100k ? is large enough not to load RESET and
small enough to pull RESET to ground. Open-drain
RESET versions are not recommended for applications
requiring valid logic for V IN down to 0V.
Adding Hysteresis to PFI
Figure 5. Setting Power-Fail Comparator to Monitor V IN
V IN
The power-fail comparator has a typical input hystere-
sis of 0.5% (of V TH ). This is sufficient for most applica-
R7
V TERM
tions where a power-supply line is being monitored
through an external resistive-divider (Figure 5). Figure 6
shows how to add hysteresis to the power-fail com-
parator. Select the ratio of R5 and R6 so PFI sees 1.23V
when V IN falls to the desired trip point (V TRIP ). Since
PFO is an open-drain output, resistors R7 and R8 add
R5
PFI
IN
MAX6791
PFO
R8
hysteresis. R7 typically is an order of magnitude
greater than R5 or R6. The current through R5 and R6
should be at least 10μA to ensure that the 100nA (max)
PFI input current does not shift the trip point. R7 should be
larger than 50k ? to prevent it from loading down the PFO .
R6
GND
Figure 6. Adding Hysteresis Power-Fail Comparator
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6791TPLD2+ | 功能描述:线性稳压器 - 标准 Dual uPower Linear RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX6791TPLD2+T | 功能描述:线性稳压器 - 标准 Dual uPower Linear RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX6791TPLD3+ | 功能描述:线性稳压器 - 标准 Dual uPower Linear RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX6791TPLD3+T | 功能描述:线性稳压器 - 标准 Dual uPower Linear RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX6791TPLD4+ | 功能描述:线性稳压器 - 标准 Dual uPower Linear RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
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