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参数资料
| 型号： | MAX16126TCC+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/19页 |
| 文件大小： | 0K |
| 描述： | IC LOAD DUMP REV V PROT 12TQFN |
| 产品培训模块： | Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 应用： | 负载突降，电压保护 |
| 电流 - 电源： | 224µA |
| 电源电压： | 3 V ~ 30 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFQFN 裸露焊盘 |
| 供应商设备封装： | 12-TQFN 裸露焊盘（3x3） |
| 包装： | 管件 |
MAX16126/MAX16127
Load-Dump/Reverse-Voltage Protection Circuits
Undervoltage Protection
The MAX16126/MAX16127 monitor the input voltage for
undervoltage conditions. If the input voltage is below the
undervoltage threshold (V IN < V TH - V TH-HYS ), GATE
goes low, turning off the external MOSFETs and FLAG
asserts. When the input voltage exceeds the undervolt-
age threshold (V IN > V TH ), GATE goes high after a 150 F s
delay (typ).
For the MAX16126/MAX16127, an external resistive
divider connected between TERM, UVSET, and GND
sets the undervoltage threshold (TERM is connected to
IN when SHDN is high).
Thermal Shutdown
The MAX16126/MAX16127 thermal shutdown feature
turns off the MOSFETs if the internal die tempera-
ture exceeds +145 N C (T J ). By ensuring good thermal
coupling between the MOSFETs and the MAX16126/
MAX16127, the thermal shutdown can turn off the
MOSFETs if they overheat.
When the junction temperature exceeds T J = +145 N C
(typ), the internal thermal sensor signals the shutdown
logic, pulling the GATE voltage low and allowing the
device to cool. When T J drops by 15 N C (typ), GATE goes
high and the MOSFETs turn back on. Do not exceed the
absolute maximum junction-temperature rating of T J =
+150 N C.
Flag Output ( FLAG )
An open-drain FLAG output indicates fault conditions.
During startup, FLAG is initially low and goes high
impedance when V OUT is greater than 90% of V IN if no
fault conditions are present. FLAG asserts low during
shutdown mode, an overvoltage, thermal shutdown, or
undervoltage fault, or when V OUT falls below 90% of V IN .
TERM Connection
The TERM connection has an internal switch to IN. In
shutdown ( SHDN = GND), this switch is open. By con-
necting the voltage threshold resistive divider to TERM
instead of directly to IN, power dissipation in the resistive
divider can be eliminated and the shutdown supply cur-
rent reduced.
Reverse-Voltage Protection
The MAX16126/MAX16127 integrate reverse-voltage
protection, preventing damage to the downstream cir-
cuitry caused by battery reversal or negative transients.
The devices can withstand reverse voltage to -36V
without damage to themselves or the load. During a
Maxim Integrated
reverse-voltage condition, the two external n-channel
MOSFETs are turned off, protecting the load. Connect a
0.1μF ceramic capacitor from IN to GND, connect a 10nF
ceramic capacitor from GATE to SRC, connect 10μF from
OUTPUT to GND, and minimize the parasitic capaci-
tance from GATE to GND to have a fast reserve-battery
voltage-transient protection. During normal operation,
both MOSFETs are turned on and have a minimal forward
voltage drop, providing lower power dissipation and a
much lower voltage drop than a reverse-battery protec-
tion diode.
Applications Information
Automotive Electrical Transients
(Load Dump)
Automotive circuits generally require supply voltage
protection from various transient conditions that occur
in automotive systems. Several standards define various
pulses that can occur. Table 1 summarizes the pulses
from the ISO7637-2 specification.
Most of the pulses can be mitigated with capacitors
and zener clamp diodes (see the Typical Operating
Characteristics and also the Increasing the Input Voltage
Protection Range section). The load dump (pulse 5a and
5b) occurs when the alternator is charging the battery
and a battery terminal gets disconnected. Due to the
sudden change in load, the alternator goes out of regula-
tion and the bus voltage spikes. The pulse has a rise time
of about 10ms and a fall time of about 400ms, but can
extend out to 1s or more depending on the characteris-
tics of the charging system. The magnitude of the pulse
depends on the bus voltage and whether the system is
unsuppressed or uses central load-dump suppression
(generally implemented using very large clamp diodes
built into the alternator). Table 1 lists the worst-case val-
ues from the ISO7637-2 specification.
Cold crank (pulse 4) occurs when activating the starter
motor in cold weather with a marginal battery. Due to the
large load imposed by the starter motor, the bus volt-
age sags. Since the MAX16126/MAX16127 can operate
down to 3V, the downstream circuitry can continue to
operate through a cold-crank condition. If desired, the
undervoltage threshold can be increased so that the
MOSFETs turn off during a cold crank, disconnecting the
downstream circuitry. An output reservoir capacitor can
be connected from OUT to GND to provide energy to the
circuit during the cold-crank condition.
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16126TCC+ | 功能描述:监控电路 Load-Dump/Reverse-V Protection Circuits 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 |
| MAX16126TCC+T | 功能描述:监控电路 Load-Dump/Reverse V Protection Circuit 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 |
| MAX16126TCD+ | 功能描述:监控电路 Load-Dump/Reverse-V Protection Circuits 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 |
| MAX16126TCD+T | 功能描述:监控电路 Load-Dump/Reverse V Protection Circuit 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 |
| MAX16127TC+ | 功能描述:监控电路 Load-Dump/Reverse-V Protection Circuits 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 |
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