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参数资料
| 型号： | MAX4959EUB+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/17页 |
| 文件大小： | 0K |
| 描述： | IC CTLR HI VOLTAGE OVP 10-MSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 过压保护控制器 |
| 应用： | PC，PDA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 管件 |
Applications Information
MOSFET Configuration and Selection
The MAX4959/MAX4960 are used with a single MOS-
FET configuration as shown in the
Typical Operating
Circuits to regulate voltage as a low-cost solution.
The MAX4959/MAX4960 are designed with pFETs. For
lower on-resistance, the external MOSFET can be multi-
ple pFETs in parallel. In most situations, MOSFETs with
RDS(ON) specified for a VGS of 4.5V work well. Also,
MOSFETs (with VDS ≥ 30V) withstand the full +28V IN
range of the MAX4959/MAX4960.
Resistor Selection for
Overvoltage/Undervoltage Window
The MAX4959/MAX4960 include undervoltage and
overvoltage comparators for window detection (see
Figure 4). GATE1 is enhanced and after the debounce
time, the pFET is turned on when the monitored voltage
is within the selected window.
The resistor values R1, R2, and R3 can be calculated
as follows:
where RTOTAL = R1 + R2 + R3.
Use the following steps to determine the values for R1,
R2, and R3:
1) Choose a value for RTOTAL, the sum of R1, R2, and
R3. Because the MAX4959/MAX4960 have very
high input impedance, RTOTAL can be up to 5MΩ.
2) Calculate R3 based on RTOTAL and the desired
VOVLO trip point:
3) Calculate R2 based on RTOTAL, R3, and the desired
VUVLO trip point:
4) Calculate R1 based on RTOTAL, R2, and R3:
R1 = RTOTAL – R2 – R3
Note that the ratio between the externally set OVLO and
UVLO threshold must not exceed:
4 [VOVLO / VUVLO]MAX ≤ 4
VDD Capacitor Selection
VDD is regulated to +5V by a linear regulator. Since the
minimum external adjustable UVLO trip threshold is
+5V, the VDD range is +5V to +28V and the value at
VDD is:
VDD = VIN – 0.8V
where VIN = 5V to 5.8V
VDD = +5V
where VIN > 5.8V
The capacitor at VDD must be large enough to provide
power to the device for an external settable time,
tHOLD, when VIN drops to 0V. The capacitor value to
have a minimum time of tHOLD is:
C = (IVDD x tHOLD) / (VDD - VDDUVLO)
The worst case scenario is where VIN = +5V, VDD = VIN
- 0.8V = +4.2V, IVDD = 10A (max). For a tHOLD time of
20ms, C = (10A x 20ms) / (4.2V - 2.2V) = 100nF.
Note: The capacitor must be greater than 100nF for the
internal regulator to be stable, and needs to have low
ESR and low leakage current, for example, a ceramic
capacitor.
IN Bypass Considerations
For most applications, bypass IN to GND with a 1F
ceramic capacitor. 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 VIN.
The MAX4959/MAX4960 provide protection against volt-
age faults up to+28V, but this does not include negative
voltages. If negative voltages are a concern, connect a
Schottky diode from IN to GND to clamp negative input
voltages.
ESD Test Conditions
The MAX4959/MAX4960 are protected from ±15kV
Human Body Model ESD on IN when IN is bypassed to
ground with a 1F ceramic capacitor.
Human Body Model
Figure 2 shows the Human Body Model and Figure 3
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
that is then discharged into the device through a 1.5kΩ
resistor.
R
UR
REF
TOTAL
UVLO
23
=
×
V
R
OR
REF
TOTAL
OVLO
3
=
×
V
VU
R
VO
R
UVLO
REF
TOTAL
OVLO
REF
TOTAL
=
()
+
=
()
V
R
V
R
23
3
MAX4959/MAX4960
High-Voltage OVP with Battery Switchover
_______________________________________________________________________________________
9
相关PDF资料 |
PDF描述 |
|---|---|
| MAX4949ELA+T | IC CTLR OVP W/FET 8.90V 8-UDFN |
| MAX4960EUB+T | IC CTLR HI VOLTAGE OVP 10-MSOP |
| MAX4959EUB+T | IC CTLR HI VOLTAGE OVP 10-MSOP |
| MAX4960ELB+T | IC CTLR HI VOLTAGE OVP 10-UDFN |
| MAX4944BELA+T | IC CTLR OVP W/FET 6.35V 8-UDFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4959EUB+ | 功能描述:电流和电力监控器、调节器 OVP w/Battery Switchover RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX4959EUB+T | 功能描述:电流和电力监控器、调节器 OVP w/Battery Switchover RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX495C/D | 功能描述:运算放大器 - 运放 Single Micropower Single-Supply Rail-to-Rail Op Amp RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX495C/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX495CPA | 功能描述:运算放大器 - 运放 Single uPower Single Supply Rail-Rail RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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