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参数资料
| 型号： | MAX5040EUB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/21页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR VOLT TRACK 10-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 处理器 |
| 电流 - 电源： | 1.3mA |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 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： | 带卷 (TR) |
Voltage-Tracking Controllers for
PowerPC, DSPs, and ASICs
Without voltage tracking, depending on the output capac-
V IN
itance and loading, CORE and I/O voltages may not fall at
the same rate. Similar to the power-up condition, the
MAX5039/MAX5040 keep CORE and I/O voltages track-
ing together by controlling NDRV, dynamically driving
NDRV high, low, or in regulation mode, depending on the
CORE and I/O voltage condition.
C HD
10 μ F
V CC
UVLO
MAX5039
MAX5040
During power-down/brownout, V CC is dropping and the
UVLO voltage is also dropping. When the UVLO voltage
falls below V UVCC , SDO is pulled low, disabling the
CORE and I/O power supplies. Similar to the shutdown
condition, the MAX5039/MAX5040 keep CORE and I/O
voltages together. It is important that V CC remains in its
operating voltage range in order to keep the MAX5039/
MAX5040 operating to provide tracking until the output
voltages have discharged to a safe level. Figure 11 illus-
Figure 11. Circuit Prolongs V CC After a Brownout/Power-Down
Condition
power supplies startup delay and/or soft-start timing,
which are specific to each of the power supplies,
CORE and I/O outputs may not rise at the same time or
at the same rate. Output loading and capacitance fur-
ther separate the two output ’s rise time. The
MAX5039/MAX5040 help the system to overcome these
differences and keeps CORE and I/O voltages tracking
together by controlling NDRV, dynamically driving
NDRV high, low, or in regulation mode, depending on
the CORE and I/O voltage condition.
Normal Operation
After the power-up period is over, CORE and I/O output
voltages settle to their respective regulated values. The
linear regulator formed by MAX5039/MAX5040 and the
external MOSFET is turned off. During normal opera-
tion, the linear regulator goes into a standby mode and
NDRV is driven low.
The resistor-divider from CORE to CORE_FB to GND
must be set so that the linear regulator regulation voltage
is less than the CORE power-supply regulation voltage.
See the Programming the CORE Voltage section.
During normal operation, the MAX5039/MAX5040 con-
stantly monitor the CORE, I/O, and CORE_FB voltages.
NDRV responds as needed, according to the condi-
tions described in the NDRV section.
Power-Down/Brownout or Shutdown
The MAX5039/MAX5040 continue to provide tracking
for the CORE and I/O output voltages during power-
down/brownout or shutdown.
During shutdown (UVLO is pulled below V UVCC ), SDO is
pulled low, disabling the CORE and I/O power supplies
together. The CORE and I/O output voltages start to fall.
trates a method to prolong V CC after a power-
down/brownout condition. The bleeder circuitry is
helpful in this power-down/brownout condition because
the bleeder helps speed up the discharge process.
FAULT Condition
While SDO is high, the MAX5039/MAX5040 keep track of
the time NDRV is driven high or in regulation mode. In a
typical system during power-up, power-down/
brownout, and normal operation, the time NDRV is driven
high or in regulation mode should last for only a few mil-
liseconds. If this time exceeds t FAULT (15ms), indicating
an abnormal condition, a fault is generated. During a
fault condition, SDO is driven low and NDRV continues
its operation as described in the NDRV section.
A fault condition is latched. To clear a fault, toggle V CC
and/or UVLO to unlatch and restart the system.
Output Short-Circuit Condition
If any of the outputs are shorted to ground, NDRV is dri-
ven high to keep the CORE and I/O voltages tracking
each other. The current through the external MOSFET is
limited by the current limit provided by the external
power supply. If the short-circuit condition lasts more
than t FAULT , a fault is generated, SDO is driven low
(which turns off the CORE and I/O power supplies), and
NDRV continues its operation as described in the
NDRV section.
Applications Information
N-Channel MOSFET Selection
The external N-channel MOSFET connected between
CORE and I/O power supplies is expected to turn on
briefly during power-up and power-down/brownout
conditions. During normal operation, this MOSFET is
turned off. In general, only a small size MOSFET is
needed. A MOSFET capable of carrying 1/4th to 1/8th
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5040EVKIT | 制造商:Maxim Integrated Products 功能描述:VOLTAGE-TRACKING CONTROLLER FOR POWERPC, DSPS - Bulk |
| MAX5041 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual-Phase.Parallelable.Average Current-Mode Controllers |
| MAX-504-1205 | 制造商:SLPOWER 制造商全称:SL Power Electronics 功能描述:400, 500 WATTS MULTIPLE OUTPUT |
| MAX-504-1205AP | 功能描述:PWR SPY QD OP +5VLT +-12VLT +5.2 RoHS:否 类别:电源 - 外部/内部（非板载） >> AC DC 转换器 系列:MAX-500 产品培训模块:MP Modular-Configurable AC-DC Power Supply 特色产品:Configurable Power Supplies 标准包装:1 系列:MP |
| MAX-504-1205F | 制造商:SL Power Electronics 功能描述:Power Supply-Multiple Output |
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