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| 型号： | MAX6397VATA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | IC SW OVERVOLT PROT 8-TDFN |
| 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： | 2,500 |
| 电压 - 工作： | 72V |
| 技术： | 混合技术 |
| 功率（瓦特）： | 1.45W |
| 电路数： | 1 |
| 应用： | 通用 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
Overvoltage Protection Switch/Limiter
Controllers Operate Up to 72V
Linear Regulator (MAX6397 Only)
IN
UVLO
THERMAL
PROTECTION
The MAX6397 is available with 5.0V, 3.3V, 2.5V, and 1.8V
factory-set output voltages. Each regulator sources up to
100mA and includes a current limit of 230mA. The linear
regulator operates in an always-on condition regardless
of the SHDN logic. For fully specified operation, V IN must
be greater than 6.5V for the MAX6397L/M (5V regulator
output). The actual output current may be limited by the
operating condition and package power dissipation.
SET
5V
1.23V
MAX6397
MAX6398
LINEAR
REGULATOR
V POK_TH
MAX6397 ONLY
10V
CHARGE
PUMP
GATE
OUT
SHDN
REG
POK
GND
Power-OK Output
POK is an open-drain output that goes low when REG
falls to 92.5% or 87.5% (see the Selector Guide) of its
nominal output voltage. To obtain a logic-level output,
connect a pullup resistor from POK to REG or another
system voltage. Use a resistor in the 100k ? range to
minimize current consumption. POK provides a valid
logic-output level down to V IN = 1.5V.
GATE Voltage
The MAX6397/MAX6398 use a high-efficiency charge
pump to generate the GATE voltage. Upon V IN exceed-
ing the 5V (typ) UVLO threshold, GATE enhances 10V
above IN (for V IN ≥ 14V) with a 75μA pullup current. An
overvoltage condition occurs when the voltage at SET
pulls above its 1.215V threshold. When the threshold is
crossed, GATE falls to OUT within 100ns with a 100mA
(typ) pulldown current. The MAX6397/MAX6398 include
an internal clamp to OUT that ensures GATE is limited
to 18V (max) above OUT to prevent gate-to-source
damage to the external FET.
The GATE cycle during overvoltage limit and overvolt-
age switch modes are quite similar but have distinct
characteristics. In overvoltage switch mode (Figure 2a),
Figure 1. Functional Diagram
The MAX6397 integrates a high-input-voltage, low-qui-
escent-current linear regulator in addition to an over-
voltage protector circuit. The linear regulator remains
enabled at all times to power low-current “always-on”
applications (independent of the state of the external
MOSFET). The regulator is offered with several stan-
dard output voltage options (5V, 3.3V, 2.5V, or 1.8V).
An open-drain power-good output notifies the system if
the regulator output falls to 92.5% or 87.5% of its nomi-
nal voltage. The MAX6397’s REG output operates inde-
pendently of the SHDN logic input.
The MAX6397/MAX6398 include internal thermal-shut-
down protection, disabling the external MOSFET and
linear regulator if the chip reaches overtemperature
conditions.
GATE is enhanced to V IN + 10V while the monitored IN
voltage remains below the overvoltage fault threshold
(SET < 1.215V). When an overvoltage fault occurs (SET
≥ 1.215V), GATE is pulled one diode below OUT, turn-
ing off the external FET and disconnecting the load
from the input. GATE remains low (FET off) as long as
V IN is above the overvoltage fault threshold. As V IN falls
back below the overvoltage fault threshold (-5% hys-
teresis) GATE is again enhanced to V IN + 10V.
In overvoltage limit mode (Figure 2b), GATE is enhanced
to V IN + 10V. While the monitored OUT voltage remains
below the overvoltage fault threshold (SET < 1.215V).
When an overvoltage fault occurs (SET ≥ 1.215V),
GATE is pulled low one diode drop below OUT until
OUT drops 5% below the overvoltage fault threshold.
GATE is then turned back on until OUT again reaches
the overvoltage fault threshold and GATE is again
turned off.
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6397WATA | 制造商:Maxim Integrated Products 功能描述:OVERVOLTAGE PROTECTION SWITCH/LIMIT - Rail/Tube |
| MAX6397WATA+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR CNTRLR 1.215V 8TDFN EP - Rail/Tube |
| MAX6397WATA+T | 功能描述:监控电路 Over Volt Protection Switch/Limiter RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6397WATA-T | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6397YATA | 制造商:Maxim Integrated Products 功能描述:OVERVOLTAGE PROTECTION SWITCH/LIMIT - Rail/Tube |
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