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Adjustable Overvoltage Protector
with High Accuracy
Internal Switch
The MAX14527/MAX14528 incorporate an internal FET
with a 100m Ω (typ) R ON . The FET is internally driven by
a charge pump that generates a necessary gate volt-
age above IN. The internal FET is capable of passing
more than 5A inrush current.
Overvoltage Lockout (OVLO)
The MAX14527 has a 5.75V (typ) overvoltage threshold
(OVLO).The MAX14528 has a 6.76V (typ) OVLO
threshold.
Thermal-Shutdown Protection
The MAX14527/MAX14528 feature thermal shutdown
circuitry. The internal FET turns off when the junction
ESD Test Conditions
ESD performance depends on a number of conditions.
The MAX14527/MAX14528 are specified for ±15kV
(HBM) typical ESD resistance on IN when IN is
bypassed to ground with a 1μF ceramic capacitor.
HBM ESD Protection
Figure 2a shows the Human Body Model, and Figure
2b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the device through a
1.5k Ω resistor.
temperature exceeds +150°C (typ). The device exits
thermal shutdown after the junction temperature cools
by 20°C (typ).
Applications Information
R C
1M Ω
CHARGE-CURRENT-
LIMIT RESISTOR
R D
1.5k Ω
DISCHARGE
RESISTANCE
IN Bypass Capacitor
For most applications, bypass IN to GND with a 1μF
ceramic capacitor as close as possible to the device to
HIGH-
VOLTAGE
DC
SOURCE
Cs
100pF
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
enable ±15kV (HBM) ESD protection on IN. If ±15kV
(HBM) ESD is not required, there is no capacitor
required at IN. If the power source has significant
inductance due to long lead length, take care to pre-
vent overshoots due to the LC tank circuit and provide
protection if necessary to prevent exceeding the +30V
absolute maximum rating on IN.
OUT Output Capacitor
Figure 2a. Human Body ESD Test Model
The slow turn-on time provides a soft-start function that
allows the MAX14527/MAX14528 to charge an output
I P 100%
90%
I R
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
capacitor up to 1000μF.
AMPERES
External OVLO Adjustment Functionality
If OVLO is connected to ground, the internal OVLO
comparator uses the internally set OVLO value.
36.8%
10%
If an external resistor-divider is connected to OVLO
and V OVLO exceeds the OVLO select voltage,
V OVLO_ SELECT , the internal OVLO comparator reads
0
0
t RL
TIME
t DL
CURRENT WAVEFORM
the IN fraction fixed by the external resistor divider. R 1 =
V IN_OVLO OVLO_THRESH × ? 1 + 1 ?
= V
1MΩ is a good starting value for minimum current con-
sumption. Since V IN_OVLO , V OVLO_THRESH , and R 1 are
known, R 2 can be calculated from the following formula:
? R ?
? R 2 ?
This external resistor-divider is completely independent
from the internal resistor-divider.
Figure 2b. Human Body Current Waveform
6
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相关代理商/技术参数
MAX14528BETA+
制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX14528BETA+T
制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX14528ETA+T
功能描述:监控电路 Over Volt Protector w/High Accuracy 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
MAX14528EVKIT+
制造商:Maxim Integrated Products 功能描述:EVKITS - Boxed Product (Development Kits)
MAX14529EEVKIT
功能描述:电源管理IC开发工具 MAX14529E Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
MAX14529EEVKIT+
功能描述:电源管理IC开发工具 MAX14529E Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
MAX14529EEWC+
制造商:Maxim Integrated Products 功能描述:- Bulk
MAX14529EEWC+T
功能描述:监控电路 Over Volt Protector w/USB Charger Detect 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