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参数资料
| 型号： | MIC2826-D9YMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 14/27页 |
| 文件大小： | 0K |
| 描述： | IC PWR MANAGER PROG 4OUT 14-TMLF |
| 特色产品： | MIC2826 Quad Output PMIC |
| 标准包装： | 1 |
| 应用： | 处理器 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-UFQFN 裸露焊盘，14-TMLF? |
| 供应商设备封装： | 14-TMLF?（2.5x2.5） |
| 包装： | 标准包装 |
| 产品目录页面： | 1086 (CN2011-ZH PDF) |
| 其它名称： | 576-3530-6 |
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Micrel, Inc.
Fault Handling
A fault is generated from either a thermal shutdown or
under-voltage lockout event. If a fault occurs, the
activation of the fault condition immediately turns off all
output supplies, sets the fault flag bit(s) in the Status
Register, and loads default values in the Enable and
Voltage Registers. The sequence Control bit SEQ CNT
is cleared to enable sequencing for sequence-enabled
parts. The POAF bit is unaffected.
The default state of the Enable Register’s POAF (Power
On After Fault) bit is high, indicating that the MIC2826
will perform a default start up when the fault goes away.
If the user instead prefers that the part does not
automatically attempt re-start after a fault, the POAF can
be programmed to a “0”.
The EN pin can be toggled high-to-low at any time to
clear the supply enables in the Enable Register and shut
down the part. The same can be achieved through I 2 C at
any time by disabling all enables in the enable register.
Either method can be used to shut down the part during
a fault.
Shutdown after a fault will maintain the fault flags in the
status register. Only Power-on-Reset or an echo reset of
the status register will clear these flags.
Thermal Shutdown (TSD)
If the MIC2826’s on-chip thermal shutdown detects that
the die is too hot, the part will immediately turn off all
outputs but maintain the bias to internal circuitry. The
thermal event is logged in the Status register which can
be read via I2C. When the thermal shutdown event is
removed, a default startup is executed if POAF is high.
Under Voltage Lock Out (UVLO)
If the MIC2826’s on-chip voltage monitor detects a low
voltage on the DVIN supply, the part will immediately
turn off all outputs but maintain the bias to internal
circuitry. When the UVLO event is removed, the outputs
will turn on using the default startup if POAF is high.
The UVLO event is logged in the status register which
can be read via I2C.
If the power on DVIN drops too low, the MIC2826 will no
longer be able to function reliably and will enter its
power-on reset (POR) state. Any previously raised TSD
or UVLO flags will now be cleared at startup
Power Good Indication and Hysteresis
The status of all four outputs can be read via I2C in the
status register. A register flag is set for each output
when it reaches 90% of its regulated value and cleared
when the output falls to about 85%.
MIC2826
Interrupt Operation
If interrupts are enabled (INT-EN = 1), then the
MIC2826’s IRQb output will be asserted (driven low)
whenever either of the two fault bits, UVLO or TSD, are
asserted. Clearing the fault status bit by writing a one to
it will clear the interrupt if the fault condition is no longer
present. If the fault is still present, the status bit will be
asserted again, together with the IRQb output. This
operation does not depend on the state of the POAF bit.
The default state of the INT_EN bit is zero, so the
interrupt output is disabled. This is done so that the
interrupt pin does not transition in MIC2826 systems
which use only the EN pin and not the I2C interface.
Ensuring Clean Switching in Sequence-Enabled
Parts
In no-sequence parts, no sequencing ever occurs, and
no special rules are required. However, in sequence-
enabled parts, care must be taken when using automatic
supply startup sequencing.
The sequence-enabled MIC2826 accomplishes supply
sequencing by asynchronously using one supply’s power
good signal to enable the next supply in line. As a
consequence “downstream” supplies can momentarily
switch off their outputs when “upstream” supplies are
switched in and out of the sequencing chain.
Example :
Suppose the sequence [DC, 1, 2, 3] is enabled and
LDO1 is off, the others are enabled and their status is
valid. If LDO1 is now enabled through I2C, LDO2 and
LDO3 will turn momentarily off, until LDO1 is valid, which
then starts LDO2 first and then LDO3.
To avoid this, the following rules should be observed,
which apply only to sequence-enabled parts:
1. If all supplies are to be turned on, it is fine to use
sequencing. This is what happens naturally as part
of the EN-initiated default startup. It may also be
accomplished by setting all four supply enables
simultaneously in the Enable Register, and leaving
the Sequence Control bit low to permit
sequencing.
2. When starting from an all-off condition and a
subset of the supplies is to be turned on,
sequencing is permitted.
3. When one or more supplies are on, and a supply
is to be turned off or on, sequencing must be
disabled by setting SEQ CNT high.
4. When a subset of the supplies has been turned on
via the Enable Register, an active transition on the
EN pin must not be used to turn on the remaining
supplies.
July 2009
14
M9999-071609-A
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| MIC2827-B2YMT TR | 功能描述:直流/直流开关调节器 Single 500mA Step-Down and Dual 150mA LDOs with I2C Voltage Control & Sequencing RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC2827-B2YMT-TR | 功能描述:Processor PMIC 14-TMLF? (2.5x2.5) 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 应用:处理器 电流 - 电源:- 电压 - 电源:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:14-UFQFN 裸露焊盘，14-TMLF? 供应商器件封装:14-TMLF?（2.5x2.5） 标准包装:1 |
| MIC2827-E1YMT TR | 功能描述:直流/直流开关调节器 Single 500mA Step-Down and Dual 150mA LDOs with I2C Voltage Control & Sequencing RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC2829-A0YAL | 制造商:Micrel Inc 功能描述:Micrel MIC2829-A0YAL |
| MIC28303-1YMP-T1 | 功能描述:PWR MODULE REG 50V 3A 64QFN 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 类型:非隔离 PoL 模块 输出数:1 电压 - 输入（最小值）:4.5V 电压 - 输入（最大值）:50V 电压 - 输出 1:0.9 ~ 24 V 电压 - 输出 2:- 电压 - 输出 3:- 电流 - 输出（最大值）:3A 功率（W） - 制造系列:- 电压 - 隔离:- 应用:ITE（商业） 特性:远程开/关，OCP，OTP，SCP，UVLO 安装类型:表面贴装 封装/外壳:64-QFN 大小/尺寸:0.47" 长 x 0.47" 宽 x 0.12" 高（12.0mm x 12.0mm x 3.0mm） 工作温度:-40°C ~ 125°C 效率:92% 功率（W） - 最大值:- 标准包装:1 |
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