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参数资料
| 型号： | MAX6876ETX+T |
| 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： | 14/39页 |
| 文件大小： | 425K |
| 代理商： | MAX6876ETX+T |
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MAX6876
EEPROM-Programmable, Quad,
Power-Supply Tracker/Sequencer Circuit
______________________________________________________________________________________
21
command (Table 7). If a latch-on fault mode is chosen,
a toggle on the internal enable clears the latch condi-
tion and restarts the device after a fault condition
(Figure 7).
Reference Voltage Input (REFIN)
The MAX6876 features an internal +1.25V voltage refer-
ence. The voltage reference sets the threshold of the
voltage detectors. Leave REFIN unconnected when
using the internal reference. REFIN accepts an external
reference in the +1.225V to +1.275V range. Use Table
8 commands to select the external reference.
Track Enable Input (TRKEN)
The track enable (TRKEN) monitor input is another fea-
ture of the MAX6876. To enable voltage-tracking
power-up operation, drive TRKEN higher than 1.285V.
When TRKEN goes below 1.25V, OUT_ outputs start
tracking down. Connect TRKEN to an external resistor-
divider network to set the desired monitor threshold.
Connect TRKEN to ABP if not used.
SYNCH
The MAX6876 provides selectable tracking synchro-
nization output or input (SYNCH). SYNCH allows track-
ing of up to 16 power supplies on the same I2C bus.
One device is programmed as the SYNCH master and
the other devices are programmed as slaves. SYNCH
of the master device outputs the common ramp voltage
to which all OUT_ voltages are tracked. The SYNCH
pins of the slave devices are inputs for the ramp control
voltage (no internal ramp is generated in the slave
devices) (see Table 1).
Monitored Outputs
OUT1–OUT4
The MAX6876 monitors four OUT_ outputs to control
the tracking/sequencing performance. After the internal
supply (ABP) exceeds the minimum voltage (2.7V)
requirements, TRKEN > 1.25V, the internal ENABLE
input is logic high, and IN1–IN4 are all within their
selected thresholds, OUT1–OUT4 will begin to track or
sequence.
During power-up mode, the MAX6876 drives the gates
of the external n-channel FETs to force the OUT_ volt-
ages to track the internally set ramp voltage. If OUT_
voltages vary from the ramp voltage by more than
±125mV, an internal comparator signals an alert that
dynamically adjusts the ramp voltage (stops the ramp
until the slow OUT_ catches up). During power-down
mode, an internal pulldown resistor (100
) on OUT_
can be enabled to help discharge load capacitance.
REGISTER
ADDRESS
EEPROM MEMORY
ADDRESS
BIT RANGE
DESCRIPTION
Bit 1—If 1, check ENABLE with I2C enable control bit
If 0, ignore ENABLE with I2C
09h
29h
[1:0]
Bit 0—If 0, enable with I2C = 0, I2C enable command bit
If 1, enable with I2C = 1
Table 7. Program ENABLE
REGISTER
ADDRESS
EEPROM MEMORY
ADDRESS
BIT RANGE
DESCRIPTION
11h
31h
0
Bit 0—If 1, selects external reference; 0 selects internal reference
Table 8. Select External Reference
ENABLE
INTERNAL
ENABLE
TRKEN
I2C ENABLE CONTROL BIT
(RAM REGISTER)
1 = YES
0 = NO
I2C ENABLE COMMAND BIT
(RAM REGISTER)
0 = OFF
1 = ON
09h[0]
09h[1]
VTRKEN
Figure 7. Logic ENABLE
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX6877ETG | 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 |
| MAX6877ETG+ | 功能描述:监控电路 Triple 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 |
| MAX6877ETG+T | 功能描述:监控电路 Triple 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 |
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