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参数资料
| 型号： | MIC5312-1.8/2.8BML |
| 厂商： | MICREL INC |
| 元件分类： | 固定正电压多路输出LDO稳压器 |
| 英文描述： | DUAL OUTPUT, FIXED POSITIVE LDO REGULATOR, DSO10 |
| 封装： | 3 X 3 MM, MLF-10 |
| 文件页数： | 3/12页 |
| 文件大小： | 476K |
| 代理商： | MIC5312-1.8/2.8BML |
Micrel, Inc.
MIC5312
January 2005
11
M9999-011205
(408) 955-1690
Functional Description
The MIC5312 is a high performance, low quiescent
current power management IC consisting of two Cap
low dropout regulators with a LowQ
TM mode featuring
lower operating current. Both regulators are capable of
sourcing 300mA. A POR circuit monitors both of the
outputs and indicates when the output voltage is within
5% of nominal. The POR offers a delay time that is
externally programmable with a single capacitor to
ground.
Enable 1 and 2
The enable inputs allow for logic control of both output
voltages with individual enable inputs. The enable input
is active high, requiring 1.0V for guaranteed operation.
The enable input is CMOS logic and cannot be left
floating.
Power-On Reset (POR)
The power-on reset output is an open-drain N-Channel
device, requiring a pull-up resistor to either the input
voltage or output voltage for proper voltage levels. The
POR output has a delay time that is programmable with
a capacitor from the SET pin to ground. The delay time
can be programmed to be as long as 1 second.
The SET pin is a current source output that charges a
capacitor that sets the delay time for the power-on reset
output. The current source is a 1.25uA current source
that charges a capacitor up from 0V. When the capacitor
reaches 1.25V, the output of the POR is allowed to go
high. The delay time in micro seconds is equal to the
Cset in picofarads.
LowQ
TM Mode
The LowQ
TM pin is logic level low, requiring <0.2V to
enter the LowQ
TM mode. The LowQTM pin cannot be left
floating. Features of the LowQ
TM mode include lower
total quiescent current of typically 7uA. The maximum
recommended load current during LowQ
TM
mode is
10mA.
Input Capacitor
Good bypassing is recommended from input to ground
to help improve AC performance. A 1F capacitor or
greater located close to the IC is recommended. Larger
load currents may require larger capacitor values.
Bypass Capacitor
The internal reference voltage of the MIC5312 can be
bypassed with a capacitor to ground to reduce output
noise and increase input ripple rejection (PSRR). A
quick-start feature allows for quick turn-on of the output
voltage. The recommended nominal bypass capacitor is
0.01F, but
an increase will result in longer turn on
times ton.
Output Capacitor
Each regulator output requires a 2.2F ceramic output
capacitor for stability. The output capacitor value can be
increased
to
improve
transient
response,
but
performance has been optimized for a 2.2F ceramic
type output capacitor. X7R/X5R dielectric-type ceramic
capacitors
are
recommended
because
of
their
temperature performance. X7R-type capacitors change
capacitance by 15% over their operating temperature
range and are the most stable type of ceramic
capacitors. Z5U and Y5V dielectric capacitors change
value by as much as 50% to 60% respectively over their
operating temperature ranges. To use a ceramic chip
capacitor with Y5V dielectric, the value must be much
higher than a X7R ceramic capacitor to ensure the same
minimum capacitance over the equivalent operating
temperature range.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5312-DKBML TR | 功能描述:IC REG LDO 1.85V/2.6V .3A 10-MLF RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:500 系列:- 稳压器拓扑结构:正，固定式 输出电压:12V 输入电压:14.5 V ~ 35 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:500mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:TO-205AD，TO-39-3 金属罐 供应商设备封装:TO-39 包装:散装 其它名称:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| MIC5312-DKYML TR | 功能描述:低压差稳压器 - LDO Portable Power IC in 3mm x 3mm MLF LowQ Dual Cap LDO w/Integrated POR RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC5312-GMBML TR | 功能描述:IC REG LDO 1.8V/2.8V .3A 10-MLF RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:500 系列:- 稳压器拓扑结构:正，固定式 输出电压:12V 输入电压:14.5 V ~ 35 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:500mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:TO-205AD，TO-39-3 金属罐 供应商设备封装:TO-39 包装:散装 其它名称:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| MIC5312-GMYML TR | 功能描述:低压差稳压器 - LDO Portable Power IC in 3mm x 3mm MLF LowQ Dual Cap LDO w/Integrated POR RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC5312-GPYML TR | 功能描述:低压差稳压器 - LDO Portable Power IC in 3mm x 3mm MLF LowQ Dual Cap LDO w/Integrated POR RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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