参数资料
| 型号： | MIC5216-3.3YM5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V .5A SOT23-5 |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V |
| 输入电压： | 最高 12V |
| 电压 - 压降（标准）： | 0.3V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 产品目录页面： | 1098 (CN2011-ZH PDF) |
| 其它名称： | 576-2756-6 |
Micrel, Inc.
Application Information
The MIC5216 is designed for 150mA to 200mA output
current applications where a high current spike (500mA)
is needed for short, startup conditions. Basic application
of the device will be discussed initially followed by a
more detailed discussion of higher current applications.
Enable/Shutdown
MIC5216
Thermal Considerations
The MIC5216 is designed to provide 200mA of
continuous current in two very small profile packages.
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 thermal resistance, junction-to-
ambient, of the device and the following basic equation.
Forcing EN (enable/shutdown) high (> 2V) enables the
regulator. EN is compatible with CMOS logic. If the
enable/shutdown feature is not required, connect EN to
P D(MAX) =
( T J(MAX) ? T A )
θ JA
IN (supply input). See Figure 5.
Input Capacitor
A 1μF capacitor should be placed from IN to GND if
there is more than 10 inches of wire between the input
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 thermal
resistance, junction-to-ambient, for the MIC5216.
and the ac filter capacitor or if a battery is used as the
input.
Output Capacitor
An output capacitor is required between OUT and GND
Package
MM8? (MM)
SOT-23-5 (M5)
θ JA Recommended
Minimum Footprint
160°C/W
220°C/W
θ JA 1” Square
Copper Clad
70°C/W
170°C/W
θ JC
30°C/W
130°C/W
to prevent oscillation. 1μF minimum is recommended.
Larger values improve the regulator’s transient
response. The output capacitor value may be increased
without limit.
The output capacitor should have an ESR (equivalent
series resistance) of about 5 ? or less and a resonant
frequency above 1MHz. Ultralow-ESR capacitors could
cause oscillation and/or underdamped transient
response. Most tantalum or aluminum electrolytic
capacitors are adequate; film types will work, but more
expensive. Many aluminum electrolytics have
electrolytes that freeze at about –30°C, so solid
tantalums are recommended for operation below –25°C.
Table 1. MIC5216 Thermal Resistance
The actual power dissipation of the regulator circuit can
be determined using one simple equation.
P D = (V IN – V OUT ) I OUT + V IN I GND
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, if we are operating the MIC5216-3.3BM5
at room temperature, with a minimum footprint layout,
we can determine the maximum input voltage for a set
output current.
At lower values of output current, less output
capacitance is needed for stability. The capacitor can be
reduced to 0.47μF for current below 10mA or 0.33μF for
P D(MAX) =
( 125 ° C ? 25 ° C )
220 ° C/W
? 455mW + 3.3V ( 150mA ) ?
currents below 1mA.
No-Load Stability
The MIC5216 will remain stable and in regulation with no
load (other than the internal voltage divider) unlike many
other voltage regulators. This is especially important in
CMOS RAM keep-alive applications.
Error Flag Output
The error flag is an open-collector output and is active
(low) when an undervoltage of approximately 5% below
the nominal output voltage is detected. A pull-up resistor
from IN to FLAG is shown in all schematics.
If an error indication is not required, FLAG may be left
open and the pull-up resistor may be omitted.
P D(MAX) = 455mW
The thermal resistance, junction-to-ambient, for the
minimum footprint is 220°C/W, taken from table 1. The
maximum power dissipation number cannot be
exceeded for proper operation of the device. Using the
output voltage of 3.3V, and an output current of 150mA,
we can determine the maximum input voltage. Ground
current, maximum of 3mA for 150mA of output current,
can be taken from the Electrical Characteristics section
of the data sheet.
455mW = (V IN – 3.3V) 150mA + V IN × 3mA
V IN ? ?
? 150mA + 3mA ?
March 2007
8
M9999-032307
相关PDF资料 |
PDF描述 |
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| MIC5219-5.0YMT TR | IC REG LDO 5V .5A 6-TMLF |
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| MIC5231-2.75YM5 TR | IC REG LDO 2.75V 10MA SOT23-5 |
| MIC5232-2.8YML TR | IC REG LDO 2.8V 10MA 6-MLF |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5216-4.0BM5 TR | 功能描述:IC REG LDO 4V .5A SOT23-5 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 |
| MIC5216-4.0YM5 TR | 功能描述:低压差稳压器 - LDO 500mA Peak 1% Low Noise LDO w/Flag (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 |
| MIC5216-40BM5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC5216-5.0 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC5216-5.0BM5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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