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参数资料
| 型号： | MAX6876ETX+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | EEPROM-Programmable, Quad, Power-Supply Tracker/Sequencer Circuit |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC36 |
| 封装： | 6 X 6 MM, 0.80 MM HEIGHT, MO-220WJJD-1, TQFN-36 |
| 文件页数： | 9/39页 |
| 文件大小： | 425K |
| 代理商： | MAX6876ETX+ |
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MAX6876
EEPROM-Programmable, Quad,
Power-Supply Tracker/Sequencer Circuit
______________________________________________________________________________________
17
To speed up the discharge of the OUT_ voltage, an
optional 100
pulldown resistor can be selected (see
Table 3).
Slew-Rate Control
The reference ramp voltage slew rate during any con-
trolled power-up/down phase can be programmed in
the 100V/s to 800V/s range. Before any power-up or
retry cycle, the MAX6876 must first ensure that all
OUT_ voltages are near ground (below the VTH_PL
power low threshold). An internal programmable track-
ing timeout period can be selected to signal a fault and
shut down the output voltages if tracking takes too long
(see Table 4).
Power-supply tracking operation should be completed
within the selected fault timeout period. For selected
control ramps of 100V/s the normal tracking time
should be approximately 50ms (5V supply, SR =
100V/s). The total tracking time is extended when the
MAX6876 must vary the control slew rate to allow slow
supplies to catch up. If the external FET is too small
(RDS is too high for the selected load current and IN_
source current), the OUT_ voltage may never reach the
control ramp voltage.
Autoretry and Latch-Off Functions
The MAX6876 features latch-off or autoretry mode to
power on again after a fault condition has been detect-
ed. Toggle ENABLE, I2C command bit, and TRKEN or
cycle device power to clear the latch. Set bit 5 of regis-
ter 09h to “1” to program the MAX6876 in latch-off
mode, or “0” to program for autoretry mode. The
autoretry time can be programmed with bits 2, 3, and 4
of register 09h (see Table 5). During autoretry, the gate
drive remains off and FAULT remains asserted. In a
master-slave application, FAULT is asserted low until all
the OUT_ outputs of each device are discharged to
GND, and only the master counts the autoretry time
while HOLD remains low (see Table 5).
Stability Comment
No external compensation is required for tracking or
slew-rate control.
Powering the MAX6876
The MAX6876 derives power from VCC or the voltage-
detector inputs: IN1–IN4 (see the Functional Diagram).
VCC (if being used) or one of the IN_ inputs must be at
least +2.7V to ensure full device operation.
The highest input voltage on IN1–IN4 or VCC supplies
power to the device. Internal hysteresis ensures that
the supply input that initially powers the device contin-
ues to power the device when multiple input voltages
are within 50mV (typ) of each other.
REGISTER
ADDRESS
EEPROM MEMORY
ADDRESS
BIT RANGE
DESCRIPTION
Bit 7—If 1, OUT4 on ramp 2
Bit 6—If 1, OUT3 on ramp 2
Bit 5—If 1, OUT2 on ramp 2
Bit 4—If 1, OUT1 on ramp 2
Bit 3—If 1, OUT4 on ramp 1
Bit 2—If 1, OUT3 on ramp 1
Bit 1—If 1, OUT2 on ramp 1
0Bh
2Bh
[7:0]
Bit 0—If 1, OUT1 on ramp 1
Bit 7—If 1, OUT4 on ramp 4
Bit 6—If 1, OUT3 on ramp 4
Bit 5—If 1, OUT2 on ramp 4
Bit 4—If 1, OUT1 on ramp 4
Bit 3—If 1, OUT4 on ramp 3
Bit 2—If 1, OUT3 on ramp 3
Bit 1—If 1, OUT2 on ramp 3
0Ch
2Ch
[7:0]
Bit 0—If 1, OUT1 on ramp 3
Table 2. Configuring Tracking and Sequencing Modes
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6876ETX+ | 功能描述:监控电路 EEPROM-Prog Quad Power-Sup Sequencer 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 |
| MAX6876ETX+T | 功能描述:监控电路 EEPROM-Prog Quad Power-Sup Sequencer 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 |
| MAX6876ETX-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 |
| MAX6876EVCMOD2 | 功能描述:监控电路 Programmers, Development Systems 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 |
| MAX6876EVKIT | 功能描述:监控电路 Programmers, Development Systems 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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