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参数资料
| 型号： | MAX6795TPMD0+T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | High-Voltage, Micropower, Single/Dual Linear Regulators with Supervisory Functions |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC20 |
| 封装： | 5 X 5 MM, 0.80 MM HEIGHT, LEAD FREE, MO-220WHHC, TQFN-20 |
| 文件页数： | 11/25页 |
| 文件大小： | 3529K |
| 代理商： | MAX6795TPMD0+T |
MAX6791–MAX6796
High-Voltage, Micropower, Single/Dual Linear
Regulators with Supervisory Functions
______________________________________________________________________________________
19
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 10F (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 10F capaci-
tor should be sufficient at all operating temperatures.
To improve power-supply rejection and transient
response, increase the capacitor between IN and GND.
Ensuring a Valid
RESET Output Down to
VIN = 0
When VIN falls below 1V, RESET current-sinking capa-
bilities decline drastically. High-impedance CMOS-
logic inputs connected to RESET can drift to
undetermined voltages. This presents no problems in
most applications, since most Ps and other circuitry
do not operate with a supply voltage below 1V. In those
applications where RESET must be valid down to 0,
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 VIN down to 0.
Adding Hysteresis to PFI
The power-fail comparator has a typical input hystere-
sis of 0.5% (of VTH). This is sufficient for most applica-
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 VIN falls to the desired trip point (VTRIP). Since
PFO is an open-drain output, resistors R7 and R8 add
hysteresis. R7 typically is an order of magnitude
greater than R5 or R6. The current through R5 and R6
should be at least 10A 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.
MAX6792
MAX6794
MAX6796
VIN
RESET
IN
GND
Figure 4. Ensuring RESET Valid to VIN = 0V
MAX6791
VIN
VTERM
R5
R6
PFO
PFI
IN
GND
Figure 5. Setting Power-Fail Comparator to Monitor VIN
MAX6791
VIN
VTERM
R5
R7
R8
R6
PFO
PFI
IN
GND
Figure 6. Adding Hysteresis Power-Fail Comparator
相关PDF资料 |
PDF描述 |
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| MAX6795TPMD1+ | High-Voltage, Micropower, Single/Dual Linear Regulators with Supervisory Functions |
| MAX6795TPMD1+T | High-Voltage, Micropower, Single/Dual Linear Regulators with Supervisory Functions |
| MAX6795TPMD2+ | High-Voltage, Micropower, Single/Dual Linear Regulators with Supervisory Functions |
| MAX6795TPMD2+T | High-Voltage, Micropower, Single/Dual Linear Regulators with Supervisory Functions |
| MAX6795TPMD3+ | High-Voltage, Micropower, Single/Dual Linear Regulators with Supervisory Functions |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6795TPMD1+ | 功能描述:线性稳压器 - 标准 Single 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 |
| MAX6795TPMD1+T | 功能描述:线性稳压器 - 标准 Single 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 |
| MAX6795TPMD2+ | 功能描述:线性稳压器 - 标准 Single 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 |
| MAX6795TPMD2+T | 功能描述:线性稳压器 - 标准 Single 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 |
| MAX6795TPMD3+ | 功能描述:线性稳压器 - 标准 Single 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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