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参数资料
| 型号： | MAX8536EUA+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR ORING MOSFET 8-MSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 网络/电信电源，整流器 |
| FET 型： | N 沟道 |
| 输出数： | 1 |
| 内部开关： | 无 |
| 延迟时间 - 关闭： | 200ns |
| 电源电压： | 3 V ~ 5.5 V |
| 电流 - 电源： | 2mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 带卷 (TR) |
ORing MOSFET Controllers with Fastest
Fault Isolation for Redundant Power Supplies
Pin Description
PIN
1
2
3
4
5
6
7
8
NAME
GATE
GND
V CC
UVP
TIMER
OVP
FAULT
CS
FUNCTION
Gate Drive Output. Bypass GATE with a 0.01μF capacitor to ground.
Ground
Power-Supply Input. Bypass V CC with a 0.1μF capacitor to ground.
Undervoltage Input. Connect a resistor-divider from the V CC to GND with the center point connected
to UVP. Leave high impedance if not used. UVP fault threshold must be set above V CCOK threshold.
Timer Input. Connect a resistor from TIMER to ground to select the charge-pump operating
frequency. The charge-pump frequency is proportional to the TIMER output current. TIMER can
source up to 100μA. If pulled low (<0.5V), the gate drive is disabled. If pulled high (above 1.25V), the
charge pump operates at 550kHz.
Overvoltage Input. Connect a resistor-divider from the CS to GND with the center point connected to
OVP. Connect to GND if not used.
Open-Drain Fault Output. FAULT is low during a fault, high impedance during normal operation.
Connect a pullup resistor of 50k ? or higher value to a voltage rail.
Current-Sensing Input. Connect CS to the positive side of the system bus. Bypass with 1nF capacitor
to GND.
Detailed Description
Critical loads often employ parallel-connected power
supplies with redundancy to enhance system reliability.
The MAX8535/MAX8536/MAX8585 are highly integrated
but inexpensive MOSFET controllers that provide isolation
and redundant power capability in high-reliability sys-
tems. The MAX8535/MAX8585 is used in 12V systems
and has an internal charge pump to drive the gates of the
n-channel pass elements to V CC + 10V. The MAX8536 is
used in 3.3V and 5V systems, with a charge pump output
of V CC + 5V.
During startup, the MAX8535/MAX8536/MAX8585 moni-
tor the voltage drop across external MOSFETs. Once
V CC approaches or exceeds the bus voltage, the
MOSFETs are turned on. The MAX8535/MAX8536/
MAX8585 feature a dual-purpose TIMER input. A single
external resistor from TIMER to ground sets the turn-on
speed of the external MOSFETs. Optionally, the TIMER
input can be used as a logic-enable pin. Once the
device is turned on, the MAX8535/MAX8536/MAX8585
monitor the load, protecting against overvoltage, under-
voltage, and reverse-current conditions.
Overvoltage and undervoltage fault thresholds are
adjustable and can be disabled. The current-limit trip
points are set by the external MOSFETs ’ R DS(ON) ,
reducing component count. An open-drain logic-low
fault output indicates if an overvoltage, undervoltage, or
reverse-current fault occurs.
V CC
V CC is the power-supply input for the MAX8535/
MAX8536/MAX8585 and the input to the internal charge
pump that drives the gate of the external MOSFETs. The
MAX8535/MAX8536/MAX8585 monitor V CC at all times.
V CC connects directly to the power supply (Silver Box or
DC-DC power modules). During startup, the device
turns on when V CC rises above the undervoltage thresh-
old V CCOK . After V CC exceeds V CCOK and V CC is
greater than (CS - 0.4V), the charge pump turns on, dri-
ving GATE high and turning on the external MOSFETs.
TIMER
The MAX8535/MAX8536/MAX8585 provide a program-
mable-frequency charge pump and shutdown function
through TIMER. Slowing down the charge-pump fre-
quency allows a user to program soft-start. Connecting
a resistor from TIMER to GND sets the charge-pump fre-
quency from 100kHz to 500kHz. Connecting TIMER to a
logic high sets charge-pump operation to a maximum
frequency of 550kHz. Pulling TIMER to GND shuts down
the charge pump and turns off the external MOSFET.
Reducing the charge-pump frequency increases the
I REVERSE startup blank time (see the Reverse-Current
Fault section).
GATE
GATE is the output of the internal charge pump that
drives the external MOSFETS. During startup, the GATE
voltage ramps up according to the charge-pump fre-
quency. At 250kHz, the GATE drive current for the
MAX8535/MAX8585 is 25μA and the GATE drive current
12
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| MAX8536EVKIT | 功能描述:功率驱动器IC RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX8537EEI | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8537EEI+ | 功能描述:DC/DC 开关控制器 Dual-Synchronous Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8537EEI+T | 功能描述:DC/DC 开关控制器 Dual-Synchronous Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8537EEI-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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