参数资料
| 型号： | MIC5311-NLYML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.85V/2.7V .3A 10-MLF |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.85V，2.7V |
| 输入电压： | 2.5 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.12V @ 300mA |
| 稳压器数量： | 2 |
| 电流 - 输出： | 300mA |
| 电流 - 限制（最小）： | 350mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘，10-MLF? |
| 供应商设备封装： | 10-MLF?（3x3） |
| 包装： | 标准包装 |
| 产品目录页面： | 1102 (CN2011-ZH PDF) |
| 其它名称： | 576-1902-6 |
Micrel, Inc.
Functional Description
The MIC5311 is a high performance, low quiescent
current power management IC consisting of two μCap
low dropout regulators with a LowQ? mode featuring
lower operating current. Both regulators are capable of
sourcing 300mA.
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.
LowQ ? Mode
The LowQ? pin is logic level low, requiring <0.2V to
enter the LowQ? mode. The LowQ? pin cannot be left
MIC5311
Thermal Considerations
The MIC5311 is designed to provide 300mA of
continuous current per channel in a very small MLF
package. Maximum power dissipation can be calculated
based on the output current and the voltage drop across
the part. To determine the maximum power dissipation
of the package, use the junction-to-ambient thermal
resistance of the device and the following basic
equation:
P D (max) = (T J (max) - T A ) / θ JA
T J (max) is the maximum junction temperature of the
die, 125°C, and T A is the ambient operating
temperature. θ JA is layout dependent; Table 1 shows
examples of the junction-to-ambient thermal resistance
for the MIC5311.
floating. Features of the LowQ? mode include lower
total quiescent current of typically 7uA.
Input Capacitor
Package
3x3 MLF?-10
θ JA Recommended
Minimum Footprint
63°C/W
θ JC
2°C/W
Good bypassing is recommended from input to ground
to help improve AC performance. A 1μF 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 MIC5311 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
0.01μF, but an increase will result in longer turn on
times t on .
Output Capacitor
Each regulator output requires a 2.2μF ceramic output
capacitor for stability. The output capacitor value can be
increased to improve transient response, but
performance has been optimized for a 2.2μF 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.
Table 1. MLF? Thermal Resistance
The actual power dissipation of the regulator circuit can
be determined using the equation:
P DTOTAL = P D LDO1 + P D LDO2
P D LDO1 = (V IN -V OUT1 ) x I OUT1
P D LDO2 = (V IN -V OUT2 ) x I OUT2
Substituting P D(max) for P D and solving for the operating
conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit.
For example, when operating the MIC5311 at 60°C with
a minimum footprint layout, the maximum load currents
can be calculated as follows:
P D (max) = (T J (max) - T A ) / θ JA
P D (max) = (125°C - 60°C) / 63°C/W
P D (max) = 1.03W
The junction-to-ambient thermal resistance for the
minimum footprint is 63°C/W , from Table 1. The
maximum power dissipation must not be exceeded for
proper operation. Using a lithium-ion battery as the
supply voltage of 4.2V, 1.8V OUT /150mA for channel 1
and 2.8V OUT /100mA for channel 2, power dissipation
can be calculated as follows:
P D LDO1 = (V IN -V OUT1 ) x I OUT1
P D LDO1 = (4.2V-1.8V) x 150mA
P D LDO1 = 360mW
P D LDO2 = (V IN -V OUT2 ) x I OUT2
P D LDO1 = (4.2V-2.8V) x 100mA
P D LDO1 = 140mW
March 2006
9
M9999-032706
(408) 955-1690
相关PDF资料 |
PDF描述 |
|---|---|
| MIC5313-F5YMT TR | IC REG LDO 1.5V/1.3V .3A 10-TMLF |
| MIC5314-F4YMT TR | IC REG LDO 1.5V/1.2V .3A 12-TMLF |
| MIC5315-F5CYMT TR | IC REG LDO 1.5V/1.3V/1V 10-TMLF |
| MIC5316-F4CYMT TR | IC REG LDO 1.5V/1.2V/1V 12-TMLF |
| MIC5318YMT TR | IC REG LDO ADJ .3A 6-TMLF |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5311-NNYML TR | 功能描述:低压差稳压器 - LDO Portable Power IC in 3mm x 3mm MLF LowQ Dual Cap LDO (Lead Free) 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-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 |
发布紧急采购，3分钟左右您将得到回复。